algebra.hom.ring ⟷ Mathlib.Algebra.Ring.Hom.Defs

mathlib commit https://github.com/leanprover-community/mathlib/commit/65a1391a0106c9204fe45bc73a039f056558cb83

@@ -6,8 +6,8 @@ Authors: Amelia Livingston, Jireh Loreaux
 import Algebra.GroupWithZero.InjSurj
 import Algebra.Ring.Basic
 import Algebra.Divisibility.Basic
-import Data.Pi.Algebra
-import Algebra.Hom.Units
+import Algebra.Group.Pi.Basic
+import Algebra.Group.Units.Hom
 import Data.Set.Image
 
 #align_import algebra.hom.ring from "leanprover-community/mathlib"@"448144f7ae193a8990cb7473c9e9a01990f64ac7"
@@ -957,7 +957,7 @@ def mkRingHomOfMulSelfOfTwoNeZero (h : ∀ x, f (x * x) = f x * f x) (h_two : (2
       rw [mul_add, add_mul, add_mul, f.map_add, f.map_add, f.map_add, f.map_add, h x, h y, add_mul,
         mul_add, mul_add, ← sub_eq_zero, add_comm, ← sub_sub, ← sub_sub, ← sub_sub, mul_comm y x,
         mul_comm (f y) (f x)] at hxy
-      simp only [add_assoc, add_sub_assoc, add_sub_cancel'_right] at hxy
+      simp only [add_assoc, add_sub_assoc, add_sub_cancel] at hxy
       rw [sub_sub, ← two_mul, ← add_sub_assoc, ← two_mul, ← mul_sub, mul_eq_zero, sub_eq_zero,
         Classical.or_iff_not_imp_left] at hxy
       exact hxy h_two }

mathlib commit https://github.com/leanprover-community/mathlib/commit/65a1391a0106c9204fe45bc73a039f056558cb83

@@ -956,10 +956,10 @@ def mkRingHomOfMulSelfOfTwoNeZero (h : ∀ x, f (x * x) = f x * f x) (h_two : (2
       have hxy := h (x + y)
       rw [mul_add, add_mul, add_mul, f.map_add, f.map_add, f.map_add, f.map_add, h x, h y, add_mul,
         mul_add, mul_add, ← sub_eq_zero, add_comm, ← sub_sub, ← sub_sub, ← sub_sub, mul_comm y x,
-        mul_comm (f y) (f x)] at hxy 
-      simp only [add_assoc, add_sub_assoc, add_sub_cancel'_right] at hxy 
+        mul_comm (f y) (f x)] at hxy
+      simp only [add_assoc, add_sub_assoc, add_sub_cancel'_right] at hxy
       rw [sub_sub, ← two_mul, ← add_sub_assoc, ← two_mul, ← mul_sub, mul_eq_zero, sub_eq_zero,
-        Classical.or_iff_not_imp_left] at hxy 
+        Classical.or_iff_not_imp_left] at hxy
       exact hxy h_two }
 #align add_monoid_hom.mk_ring_hom_of_mul_self_of_two_ne_zero AddMonoidHom.mkRingHomOfMulSelfOfTwoNeZero
 -/

mathlib commit https://github.com/leanprover-community/mathlib/commit/65a1391a0106c9204fe45bc73a039f056558cb83

@@ -187,7 +187,7 @@ theorem coe_copy (f : α →ₙ+* β) (f' : α → β) (h : f' = f) : ⇑(f.copy
 
 #print NonUnitalRingHom.copy_eq /-
 theorem copy_eq (f : α →ₙ+* β) (f' : α → β) (h : f' = f) : f.copy f' h = f :=
-  FunLike.ext' h
+  DFunLike.ext' h
 #align non_unital_ring_hom.copy_eq NonUnitalRingHom.copy_eq
 -/
 
@@ -202,13 +202,13 @@ variable (f : α →ₙ+* β) {x y : α} {rα rβ}
 #print NonUnitalRingHom.ext /-
 @[ext]
 theorem ext ⦃f g : α →ₙ+* β⦄ : (∀ x, f x = g x) → f = g :=
-  FunLike.ext _ _
+  DFunLike.ext _ _
 #align non_unital_ring_hom.ext NonUnitalRingHom.ext
 -/
 
 #print NonUnitalRingHom.ext_iff /-
 theorem ext_iff {f g : α →ₙ+* β} : f = g ↔ ∀ x, f x = g x :=
-  FunLike.ext_iff
+  DFunLike.ext_iff
 #align non_unital_ring_hom.ext_iff NonUnitalRingHom.ext_iff
 -/
 
@@ -598,7 +598,7 @@ theorem coe_copy (f : α →+* β) (f' : α → β) (h : f' = f) : ⇑(f.copy f'
 
 #print RingHom.copy_eq /-
 theorem copy_eq (f : α →+* β) (f' : α → β) (h : f' = f) : f.copy f' h = f :=
-  FunLike.ext' h
+  DFunLike.ext' h
 #align ring_hom.copy_eq RingHom.copy_eq
 -/
 
@@ -612,32 +612,32 @@ variable (f : α →+* β) {x y : α} {rα rβ}
 
 #print RingHom.congr_fun /-
 theorem congr_fun {f g : α →+* β} (h : f = g) (x : α) : f x = g x :=
-  FunLike.congr_fun h x
+  DFunLike.congr_fun h x
 #align ring_hom.congr_fun RingHom.congr_fun
 -/
 
 #print RingHom.congr_arg /-
 theorem congr_arg (f : α →+* β) {x y : α} (h : x = y) : f x = f y :=
-  FunLike.congr_arg f h
+  DFunLike.congr_arg f h
 #align ring_hom.congr_arg RingHom.congr_arg
 -/
 
 #print RingHom.coe_inj /-
 theorem coe_inj ⦃f g : α →+* β⦄ (h : (f : α → β) = g) : f = g :=
-  FunLike.coe_injective h
+  DFunLike.coe_injective h
 #align ring_hom.coe_inj RingHom.coe_inj
 -/
 
 #print RingHom.ext /-
 @[ext]
 theorem ext ⦃f g : α →+* β⦄ : (∀ x, f x = g x) → f = g :=
-  FunLike.ext _ _
+  DFunLike.ext _ _
 #align ring_hom.ext RingHom.ext
 -/
 
 #print RingHom.ext_iff /-
 theorem ext_iff {f g : α →+* β} : f = g ↔ ∀ x, f x = g x :=
-  FunLike.ext_iff
+  DFunLike.ext_iff
 #align ring_hom.ext_iff RingHom.ext_iff
 -/
 

mathlib commit https://github.com/leanprover-community/mathlib/commit/65a1391a0106c9204fe45bc73a039f056558cb83

@@ -959,7 +959,7 @@ def mkRingHomOfMulSelfOfTwoNeZero (h : ∀ x, f (x * x) = f x * f x) (h_two : (2
         mul_comm (f y) (f x)] at hxy 
       simp only [add_assoc, add_sub_assoc, add_sub_cancel'_right] at hxy 
       rw [sub_sub, ← two_mul, ← add_sub_assoc, ← two_mul, ← mul_sub, mul_eq_zero, sub_eq_zero,
-        or_iff_not_imp_left] at hxy 
+        Classical.or_iff_not_imp_left] at hxy 
       exact hxy h_two }
 #align add_monoid_hom.mk_ring_hom_of_mul_self_of_two_ne_zero AddMonoidHom.mkRingHomOfMulSelfOfTwoNeZero
 -/

mathlib commit https://github.com/leanprover-community/mathlib/commit/ce64cd319bb6b3e82f31c2d38e79080d377be451

@@ -3,12 +3,12 @@ Copyright (c) 2019 Amelia Livingston. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Amelia Livingston, Jireh Loreaux
 -/
-import Mathbin.Algebra.GroupWithZero.InjSurj
-import Mathbin.Algebra.Ring.Basic
-import Mathbin.Algebra.Divisibility.Basic
-import Mathbin.Data.Pi.Algebra
-import Mathbin.Algebra.Hom.Units
-import Mathbin.Data.Set.Image
+import Algebra.GroupWithZero.InjSurj
+import Algebra.Ring.Basic
+import Algebra.Divisibility.Basic
+import Data.Pi.Algebra
+import Algebra.Hom.Units
+import Data.Set.Image
 
 #align_import algebra.hom.ring from "leanprover-community/mathlib"@"448144f7ae193a8990cb7473c9e9a01990f64ac7"
 

mathlib commit https://github.com/leanprover-community/mathlib/commit/32a7e535287f9c73f2e4d2aef306a39190f0b504

@@ -119,7 +119,7 @@ instance : NonUnitalRingHomClass (α →ₙ+* β) α β
   coe_injective' f g h := by cases f <;> cases g <;> congr
   map_add := NonUnitalRingHom.map_add'
   map_zero := NonUnitalRingHom.map_zero'
-  map_mul := NonUnitalRingHom.map_mul'
+  map_hMul := NonUnitalRingHom.map_mul'
 
 /-- Helper instance for when there's too many metavariables to apply `fun_like.has_coe_to_fun`
 directly. -/
@@ -496,7 +496,7 @@ instance : RingHomClass (α →+* β) α β
   coe_injective' f g h := by cases f <;> cases g <;> congr
   map_add := RingHom.map_add'
   map_zero := RingHom.map_zero'
-  map_mul := RingHom.map_mul'
+  map_hMul := RingHom.map_mul'
   map_one := RingHom.map_one'
 
 /-- Helper instance for when there's too many metavariables to apply `fun_like.has_coe_to_fun`

mathlib commit https://github.com/leanprover-community/mathlib/commit/8ea5598db6caeddde6cb734aa179cc2408dbd345

@@ -2,11 +2,6 @@
 Copyright (c) 2019 Amelia Livingston. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Amelia Livingston, Jireh Loreaux
-
-! This file was ported from Lean 3 source module algebra.hom.ring
-! leanprover-community/mathlib commit 448144f7ae193a8990cb7473c9e9a01990f64ac7
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathbin.Algebra.GroupWithZero.InjSurj
 import Mathbin.Algebra.Ring.Basic
@@ -15,6 +10,8 @@ import Mathbin.Data.Pi.Algebra
 import Mathbin.Algebra.Hom.Units
 import Mathbin.Data.Set.Image
 
+#align_import algebra.hom.ring from "leanprover-community/mathlib"@"448144f7ae193a8990cb7473c9e9a01990f64ac7"
+
 /-!
 # Homomorphisms of semirings and rings
 

mathlib commit https://github.com/leanprover-community/mathlib/commit/9fb8964792b4237dac6200193a0d533f1b3f7423

@@ -73,7 +73,6 @@ structure NonUnitalRingHom (α β : Type _) [NonUnitalNonAssocSemiring α]
 #align non_unital_ring_hom NonUnitalRingHom
 -/
 
--- mathport name: «expr →ₙ+* »
 infixr:25 " →ₙ+* " => NonUnitalRingHom
 
 /-- Reinterpret a non-unital ring homomorphism `f : α →ₙ+* β` as a semigroup
@@ -117,8 +116,6 @@ See note [implicit instance arguments].
 
 variable {rα : NonUnitalNonAssocSemiring α} {rβ : NonUnitalNonAssocSemiring β}
 
-include rα rβ
-
 instance : NonUnitalRingHomClass (α →ₙ+* β) α β
     where
   coe := NonUnitalRingHom.toFun
@@ -147,41 +144,55 @@ theorem coe_coe [NonUnitalRingHomClass F α β] (f : F) : ((f : α →ₙ+* β)
   rfl
 #align non_unital_ring_hom.coe_coe NonUnitalRingHom.coe_coe
 
+#print NonUnitalRingHom.coe_toMulHom /-
 @[simp]
 theorem coe_toMulHom (f : α →ₙ+* β) : ⇑f.toMulHom = f :=
   rfl
 #align non_unital_ring_hom.coe_to_mul_hom NonUnitalRingHom.coe_toMulHom
+-/
 
+#print NonUnitalRingHom.coe_mulHom_mk /-
 @[simp]
 theorem coe_mulHom_mk (f : α → β) (h₁ h₂ h₃) : ((⟨f, h₁, h₂, h₃⟩ : α →ₙ+* β) : α →ₙ* β) = ⟨f, h₁⟩ :=
   rfl
 #align non_unital_ring_hom.coe_mul_hom_mk NonUnitalRingHom.coe_mulHom_mk
+-/
 
+#print NonUnitalRingHom.coe_toAddMonoidHom /-
 @[simp]
 theorem coe_toAddMonoidHom (f : α →ₙ+* β) : ⇑f.toAddMonoidHom = f :=
   rfl
 #align non_unital_ring_hom.coe_to_add_monoid_hom NonUnitalRingHom.coe_toAddMonoidHom
+-/
 
+#print NonUnitalRingHom.coe_addMonoidHom_mk /-
 @[simp]
 theorem coe_addMonoidHom_mk (f : α → β) (h₁ h₂ h₃) :
     ((⟨f, h₁, h₂, h₃⟩ : α →ₙ+* β) : α →+ β) = ⟨f, h₂, h₃⟩ :=
   rfl
 #align non_unital_ring_hom.coe_add_monoid_hom_mk NonUnitalRingHom.coe_addMonoidHom_mk
+-/
 
+#print NonUnitalRingHom.copy /-
 /-- Copy of a `ring_hom` with a new `to_fun` equal to the old one. Useful to fix definitional
 equalities. -/
 protected def copy (f : α →ₙ+* β) (f' : α → β) (h : f' = f) : α →ₙ+* β :=
   { f.toMulHom.copy f' h, f.toAddMonoidHom.copy f' h with }
 #align non_unital_ring_hom.copy NonUnitalRingHom.copy
+-/
 
+#print NonUnitalRingHom.coe_copy /-
 @[simp]
 theorem coe_copy (f : α →ₙ+* β) (f' : α → β) (h : f' = f) : ⇑(f.copy f' h) = f' :=
   rfl
 #align non_unital_ring_hom.coe_copy NonUnitalRingHom.coe_copy
+-/
 
+#print NonUnitalRingHom.copy_eq /-
 theorem copy_eq (f : α →ₙ+* β) (f' : α → β) (h : f' = f) : f.copy f' h = f :=
   FunLike.ext' h
 #align non_unital_ring_hom.copy_eq NonUnitalRingHom.copy_eq
+-/
 
 end coe
 
@@ -189,31 +200,39 @@ variable [rα : NonUnitalNonAssocSemiring α] [rβ : NonUnitalNonAssocSemiring 
 
 section
 
-include rα rβ
-
 variable (f : α →ₙ+* β) {x y : α} {rα rβ}
 
+#print NonUnitalRingHom.ext /-
 @[ext]
 theorem ext ⦃f g : α →ₙ+* β⦄ : (∀ x, f x = g x) → f = g :=
   FunLike.ext _ _
 #align non_unital_ring_hom.ext NonUnitalRingHom.ext
+-/
 
+#print NonUnitalRingHom.ext_iff /-
 theorem ext_iff {f g : α →ₙ+* β} : f = g ↔ ∀ x, f x = g x :=
   FunLike.ext_iff
 #align non_unital_ring_hom.ext_iff NonUnitalRingHom.ext_iff
+-/
 
+#print NonUnitalRingHom.mk_coe /-
 @[simp]
 theorem mk_coe (f : α →ₙ+* β) (h₁ h₂ h₃) : NonUnitalRingHom.mk f h₁ h₂ h₃ = f :=
   ext fun _ => rfl
 #align non_unital_ring_hom.mk_coe NonUnitalRingHom.mk_coe
+-/
 
+#print NonUnitalRingHom.coe_addMonoidHom_injective /-
 theorem coe_addMonoidHom_injective : Injective (coe : (α →ₙ+* β) → α →+ β) := fun f g h =>
   ext <| AddMonoidHom.congr_fun h
 #align non_unital_ring_hom.coe_add_monoid_hom_injective NonUnitalRingHom.coe_addMonoidHom_injective
+-/
 
+#print NonUnitalRingHom.coe_mulHom_injective /-
 theorem coe_mulHom_injective : Injective (coe : (α →ₙ+* β) → α →ₙ* β) := fun f g h =>
   ext <| MulHom.congr_fun h
 #align non_unital_ring_hom.coe_mul_hom_injective NonUnitalRingHom.coe_mulHom_injective
+-/
 
 end
 
@@ -224,8 +243,6 @@ protected def id (α : Type _) [NonUnitalNonAssocSemiring α] : α →ₙ+* α :
 #align non_unital_ring_hom.id NonUnitalRingHom.id
 -/
 
-include rα rβ
-
 instance : Zero (α →ₙ+* β) :=
   ⟨{  toFun := 0
       map_mul' := fun x y => (MulZeroClass.mul_zero (0 : β)).symm
@@ -235,37 +252,43 @@ instance : Zero (α →ₙ+* β) :=
 instance : Inhabited (α →ₙ+* β) :=
   ⟨0⟩
 
+#print NonUnitalRingHom.coe_zero /-
 @[simp]
 theorem coe_zero : ⇑(0 : α →ₙ+* β) = 0 :=
   rfl
 #align non_unital_ring_hom.coe_zero NonUnitalRingHom.coe_zero
+-/
 
+#print NonUnitalRingHom.zero_apply /-
 @[simp]
 theorem zero_apply (x : α) : (0 : α →ₙ+* β) x = 0 :=
   rfl
 #align non_unital_ring_hom.zero_apply NonUnitalRingHom.zero_apply
+-/
 
-omit rβ
-
+#print NonUnitalRingHom.id_apply /-
 @[simp]
 theorem id_apply (x : α) : NonUnitalRingHom.id α x = x :=
   rfl
 #align non_unital_ring_hom.id_apply NonUnitalRingHom.id_apply
+-/
 
+#print NonUnitalRingHom.coe_addMonoidHom_id /-
 @[simp]
 theorem coe_addMonoidHom_id : (NonUnitalRingHom.id α : α →+ α) = AddMonoidHom.id α :=
   rfl
 #align non_unital_ring_hom.coe_add_monoid_hom_id NonUnitalRingHom.coe_addMonoidHom_id
+-/
 
+#print NonUnitalRingHom.coe_mulHom_id /-
 @[simp]
 theorem coe_mulHom_id : (NonUnitalRingHom.id α : α →ₙ* α) = MulHom.id α :=
   rfl
 #align non_unital_ring_hom.coe_mul_hom_id NonUnitalRingHom.coe_mulHom_id
+-/
 
 variable {rγ : NonUnitalNonAssocSemiring γ}
 
-include rβ rγ
-
 #print NonUnitalRingHom.comp /-
 /-- Composition of non-unital ring homomorphisms is a non-unital ring homomorphism. -/
 def comp (g : β →ₙ+* γ) (f : α →ₙ+* β) : α →ₙ+* γ :=
@@ -273,55 +296,69 @@ def comp (g : β →ₙ+* γ) (f : α →ₙ+* β) : α →ₙ+* γ :=
 #align non_unital_ring_hom.comp NonUnitalRingHom.comp
 -/
 
+#print NonUnitalRingHom.comp_assoc /-
 /-- Composition of non-unital ring homomorphisms is associative. -/
 theorem comp_assoc {δ} {rδ : NonUnitalNonAssocSemiring δ} (f : α →ₙ+* β) (g : β →ₙ+* γ)
     (h : γ →ₙ+* δ) : (h.comp g).comp f = h.comp (g.comp f) :=
   rfl
 #align non_unital_ring_hom.comp_assoc NonUnitalRingHom.comp_assoc
+-/
 
+#print NonUnitalRingHom.coe_comp /-
 @[simp]
 theorem coe_comp (g : β →ₙ+* γ) (f : α →ₙ+* β) : ⇑(g.comp f) = g ∘ f :=
   rfl
 #align non_unital_ring_hom.coe_comp NonUnitalRingHom.coe_comp
+-/
 
+#print NonUnitalRingHom.comp_apply /-
 @[simp]
 theorem comp_apply (g : β →ₙ+* γ) (f : α →ₙ+* β) (x : α) : g.comp f x = g (f x) :=
   rfl
 #align non_unital_ring_hom.comp_apply NonUnitalRingHom.comp_apply
+-/
 
+#print NonUnitalRingHom.coe_comp_addMonoidHom /-
 @[simp]
 theorem coe_comp_addMonoidHom (g : β →ₙ+* γ) (f : α →ₙ+* β) :
     (g.comp f : α →+ γ) = (g : β →+ γ).comp f :=
   rfl
 #align non_unital_ring_hom.coe_comp_add_monoid_hom NonUnitalRingHom.coe_comp_addMonoidHom
+-/
 
+#print NonUnitalRingHom.coe_comp_mulHom /-
 @[simp]
 theorem coe_comp_mulHom (g : β →ₙ+* γ) (f : α →ₙ+* β) :
     (g.comp f : α →ₙ* γ) = (g : β →ₙ* γ).comp f :=
   rfl
 #align non_unital_ring_hom.coe_comp_mul_hom NonUnitalRingHom.coe_comp_mulHom
+-/
 
+#print NonUnitalRingHom.comp_zero /-
 @[simp]
 theorem comp_zero (g : β →ₙ+* γ) : g.comp (0 : α →ₙ+* β) = 0 := by ext; simp
 #align non_unital_ring_hom.comp_zero NonUnitalRingHom.comp_zero
+-/
 
+#print NonUnitalRingHom.zero_comp /-
 @[simp]
 theorem zero_comp (f : α →ₙ+* β) : (0 : β →ₙ+* γ).comp f = 0 := by ext; rfl
 #align non_unital_ring_hom.zero_comp NonUnitalRingHom.zero_comp
+-/
 
-omit rγ
-
+#print NonUnitalRingHom.comp_id /-
 @[simp]
 theorem comp_id (f : α →ₙ+* β) : f.comp (NonUnitalRingHom.id α) = f :=
   ext fun x => rfl
 #align non_unital_ring_hom.comp_id NonUnitalRingHom.comp_id
+-/
 
+#print NonUnitalRingHom.id_comp /-
 @[simp]
 theorem id_comp (f : α →ₙ+* β) : (NonUnitalRingHom.id β).comp f = f :=
   ext fun x => rfl
 #align non_unital_ring_hom.id_comp NonUnitalRingHom.id_comp
-
-omit rβ
+-/
 
 instance : MonoidWithZero (α →ₙ+* α)
     where
@@ -334,37 +371,45 @@ instance : MonoidWithZero (α →ₙ+* α)
   mul_zero := comp_zero
   zero_mul := zero_comp
 
+#print NonUnitalRingHom.one_def /-
 theorem one_def : (1 : α →ₙ+* α) = NonUnitalRingHom.id α :=
   rfl
 #align non_unital_ring_hom.one_def NonUnitalRingHom.one_def
+-/
 
+#print NonUnitalRingHom.coe_one /-
 @[simp]
 theorem coe_one : ⇑(1 : α →ₙ+* α) = id :=
   rfl
 #align non_unital_ring_hom.coe_one NonUnitalRingHom.coe_one
+-/
 
+#print NonUnitalRingHom.mul_def /-
 theorem mul_def (f g : α →ₙ+* α) : f * g = f.comp g :=
   rfl
 #align non_unital_ring_hom.mul_def NonUnitalRingHom.mul_def
+-/
 
+#print NonUnitalRingHom.coe_mul /-
 @[simp]
 theorem coe_mul (f g : α →ₙ+* α) : ⇑(f * g) = f ∘ g :=
   rfl
 #align non_unital_ring_hom.coe_mul NonUnitalRingHom.coe_mul
+-/
 
-include rβ rγ
-
+#print NonUnitalRingHom.cancel_right /-
 theorem cancel_right {g₁ g₂ : β →ₙ+* γ} {f : α →ₙ+* β} (hf : Surjective f) :
     g₁.comp f = g₂.comp f ↔ g₁ = g₂ :=
   ⟨fun h => ext <| hf.forall.2 (ext_iff.1 h), fun h => h ▸ rfl⟩
 #align non_unital_ring_hom.cancel_right NonUnitalRingHom.cancel_right
+-/
 
+#print NonUnitalRingHom.cancel_left /-
 theorem cancel_left {g : β →ₙ+* γ} {f₁ f₂ : α →ₙ+* β} (hg : Injective g) :
     g.comp f₁ = g.comp f₂ ↔ f₁ = f₂ :=
   ⟨fun h => ext fun x => hg <| by rw [← comp_apply, h, comp_apply], fun h => h ▸ rfl⟩
 #align non_unital_ring_hom.cancel_left NonUnitalRingHom.cancel_left
-
-omit rα rβ rγ
+-/
 
 end NonUnitalRingHom
 
@@ -378,7 +423,6 @@ structure RingHom (α : Type _) (β : Type _) [NonAssocSemiring α] [NonAssocSem
 #align ring_hom RingHom
 -/
 
--- mathport name: «expr →+* »
 infixr:25 " →+* " => RingHom
 
 /-- Reinterpret a ring homomorphism `f : α →+* β` as a monoid with zero homomorphism `α →*₀ β`.
@@ -414,10 +458,12 @@ class RingHomClass (F : Type _) (α β : outParam (Type _)) [NonAssocSemiring α
 
 variable [NonAssocSemiring α] [NonAssocSemiring β] [RingHomClass F α β]
 
+#print map_bit1 /-
 /-- Ring homomorphisms preserve `bit1`. -/
 @[simp]
 theorem map_bit1 (f : F) (a : α) : (f (bit1 a) : β) = bit1 (f a) := by simp [bit1]
 #align map_bit1 map_bit1
+-/
 
 instance : CoeTC F (α →+* β) :=
   ⟨fun f =>
@@ -447,8 +493,6 @@ See note [implicit instance arguments].
 
 variable {rα : NonAssocSemiring α} {rβ : NonAssocSemiring β}
 
-include rα rβ
-
 instance : RingHomClass (α →+* β) α β
     where
   coe := RingHom.toFun
@@ -466,20 +510,26 @@ instance : CoeFun (α →+* β) fun _ => α → β :=
 
 initialize_simps_projections RingHom (toFun → apply)
 
+#print RingHom.toFun_eq_coe /-
 @[simp]
 theorem toFun_eq_coe (f : α →+* β) : f.toFun = f :=
   rfl
 #align ring_hom.to_fun_eq_coe RingHom.toFun_eq_coe
+-/
 
+#print RingHom.coe_mk /-
 @[simp]
 theorem coe_mk (f : α → β) (h₁ h₂ h₃ h₄) : ⇑(⟨f, h₁, h₂, h₃, h₄⟩ : α →+* β) = f :=
   rfl
 #align ring_hom.coe_mk RingHom.coe_mk
+-/
 
+#print RingHom.coe_coe /-
 @[simp]
 theorem coe_coe {F : Type _} [RingHomClass F α β] (f : F) : ((f : α →+* β) : α → β) = f :=
   rfl
 #align ring_hom.coe_coe RingHom.coe_coe
+-/
 
 #print RingHom.coeToMonoidHom /-
 instance coeToMonoidHom : Coe (α →+* β) (α →* β) :=
@@ -492,52 +542,68 @@ theorem coe_monoidHom (f : α →+* β) : ⇑(f : α →* β) = f :=
   rfl
 #align ring_hom.coe_monoid_hom RingHom.coe_monoidHom
 
+#print RingHom.toMonoidHom_eq_coe /-
 @[simp]
 theorem toMonoidHom_eq_coe (f : α →+* β) : f.toMonoidHom = f :=
   rfl
 #align ring_hom.to_monoid_hom_eq_coe RingHom.toMonoidHom_eq_coe
+-/
 
+#print RingHom.toMonoidWithZeroHom_eq_coe /-
 @[simp]
 theorem toMonoidWithZeroHom_eq_coe (f : α →+* β) : (f.toMonoidWithZeroHom : α → β) = f :=
   rfl
 #align ring_hom.to_monoid_with_zero_hom_eq_coe RingHom.toMonoidWithZeroHom_eq_coe
+-/
 
+#print RingHom.coe_monoidHom_mk /-
 @[simp]
 theorem coe_monoidHom_mk (f : α → β) (h₁ h₂ h₃ h₄) :
     ((⟨f, h₁, h₂, h₃, h₄⟩ : α →+* β) : α →* β) = ⟨f, h₁, h₂⟩ :=
   rfl
 #align ring_hom.coe_monoid_hom_mk RingHom.coe_monoidHom_mk
+-/
 
 @[simp, norm_cast]
 theorem coe_addMonoidHom (f : α →+* β) : ⇑(f : α →+ β) = f :=
   rfl
 #align ring_hom.coe_add_monoid_hom RingHom.coe_addMonoidHom
 
+#print RingHom.toAddMonoidHom_eq_coe /-
 @[simp]
 theorem toAddMonoidHom_eq_coe (f : α →+* β) : f.toAddMonoidHom = f :=
   rfl
 #align ring_hom.to_add_monoid_hom_eq_coe RingHom.toAddMonoidHom_eq_coe
+-/
 
+#print RingHom.coe_addMonoidHom_mk /-
 @[simp]
 theorem coe_addMonoidHom_mk (f : α → β) (h₁ h₂ h₃ h₄) :
     ((⟨f, h₁, h₂, h₃, h₄⟩ : α →+* β) : α →+ β) = ⟨f, h₃, h₄⟩ :=
   rfl
 #align ring_hom.coe_add_monoid_hom_mk RingHom.coe_addMonoidHom_mk
+-/
 
+#print RingHom.copy /-
 /-- Copy of a `ring_hom` with a new `to_fun` equal to the old one. Useful to fix definitional
 equalities. -/
 def copy (f : α →+* β) (f' : α → β) (h : f' = f) : α →+* β :=
   { f.toMonoidWithZeroHom.copy f' h, f.toAddMonoidHom.copy f' h with }
 #align ring_hom.copy RingHom.copy
+-/
 
+#print RingHom.coe_copy /-
 @[simp]
 theorem coe_copy (f : α →+* β) (f' : α → β) (h : f' = f) : ⇑(f.copy f' h) = f' :=
   rfl
 #align ring_hom.coe_copy RingHom.coe_copy
+-/
 
+#print RingHom.copy_eq /-
 theorem copy_eq (f : α →+* β) (f' : α → β) (h : f' = f) : f.copy f' h = f :=
   FunLike.ext' h
 #align ring_hom.copy_eq RingHom.copy_eq
+-/
 
 end coe
 
@@ -545,63 +611,85 @@ variable [rα : NonAssocSemiring α] [rβ : NonAssocSemiring β]
 
 section
 
-include rα rβ
-
 variable (f : α →+* β) {x y : α} {rα rβ}
 
+#print RingHom.congr_fun /-
 theorem congr_fun {f g : α →+* β} (h : f = g) (x : α) : f x = g x :=
   FunLike.congr_fun h x
 #align ring_hom.congr_fun RingHom.congr_fun
+-/
 
+#print RingHom.congr_arg /-
 theorem congr_arg (f : α →+* β) {x y : α} (h : x = y) : f x = f y :=
   FunLike.congr_arg f h
 #align ring_hom.congr_arg RingHom.congr_arg
+-/
 
+#print RingHom.coe_inj /-
 theorem coe_inj ⦃f g : α →+* β⦄ (h : (f : α → β) = g) : f = g :=
   FunLike.coe_injective h
 #align ring_hom.coe_inj RingHom.coe_inj
+-/
 
+#print RingHom.ext /-
 @[ext]
 theorem ext ⦃f g : α →+* β⦄ : (∀ x, f x = g x) → f = g :=
   FunLike.ext _ _
 #align ring_hom.ext RingHom.ext
+-/
 
+#print RingHom.ext_iff /-
 theorem ext_iff {f g : α →+* β} : f = g ↔ ∀ x, f x = g x :=
   FunLike.ext_iff
 #align ring_hom.ext_iff RingHom.ext_iff
+-/
 
+#print RingHom.mk_coe /-
 @[simp]
 theorem mk_coe (f : α →+* β) (h₁ h₂ h₃ h₄) : RingHom.mk f h₁ h₂ h₃ h₄ = f :=
   ext fun _ => rfl
 #align ring_hom.mk_coe RingHom.mk_coe
+-/
 
+#print RingHom.coe_addMonoidHom_injective /-
 theorem coe_addMonoidHom_injective : Injective (coe : (α →+* β) → α →+ β) := fun f g h =>
   ext <| AddMonoidHom.congr_fun h
 #align ring_hom.coe_add_monoid_hom_injective RingHom.coe_addMonoidHom_injective
+-/
 
+#print RingHom.coe_monoidHom_injective /-
 theorem coe_monoidHom_injective : Injective (coe : (α →+* β) → α →* β) := fun f g h =>
   ext <| MonoidHom.congr_fun h
 #align ring_hom.coe_monoid_hom_injective RingHom.coe_monoidHom_injective
+-/
 
+#print RingHom.map_zero /-
 /-- Ring homomorphisms map zero to zero. -/
 protected theorem map_zero (f : α →+* β) : f 0 = 0 :=
   map_zero f
 #align ring_hom.map_zero RingHom.map_zero
+-/
 
+#print RingHom.map_one /-
 /-- Ring homomorphisms map one to one. -/
 protected theorem map_one (f : α →+* β) : f 1 = 1 :=
   map_one f
 #align ring_hom.map_one RingHom.map_one
+-/
 
+#print RingHom.map_add /-
 /-- Ring homomorphisms preserve addition. -/
 protected theorem map_add (f : α →+* β) : ∀ a b, f (a + b) = f a + f b :=
   map_add f
 #align ring_hom.map_add RingHom.map_add
+-/
 
+#print RingHom.map_mul /-
 /-- Ring homomorphisms preserve multiplication. -/
 protected theorem map_mul (f : α →+* β) : ∀ a b, f (a * b) = f a * f b :=
   map_mul f
 #align ring_hom.map_mul RingHom.map_mul
+-/
 
 /-- Ring homomorphisms preserve `bit0`. -/
 protected theorem map_bit0 (f : α →+* β) : ∀ a, f (bit0 a) = bit0 (f a) :=
@@ -613,26 +701,35 @@ protected theorem map_bit1 (f : α →+* β) : ∀ a, f (bit1 a) = bit1 (f a) :=
   map_bit1 f
 #align ring_hom.map_bit1 RingHom.map_bit1
 
+#print RingHom.map_ite_zero_one /-
 @[simp]
 theorem map_ite_zero_one {F : Type _} [RingHomClass F α β] (f : F) (p : Prop) [Decidable p] :
     f (ite p 0 1) = ite p 0 1 := by split_ifs <;> simp [h]
 #align ring_hom.map_ite_zero_one RingHom.map_ite_zero_one
+-/
 
+#print RingHom.map_ite_one_zero /-
 @[simp]
 theorem map_ite_one_zero {F : Type _} [RingHomClass F α β] (f : F) (p : Prop) [Decidable p] :
     f (ite p 1 0) = ite p 1 0 := by split_ifs <;> simp [h]
 #align ring_hom.map_ite_one_zero RingHom.map_ite_one_zero
+-/
 
+#print RingHom.codomain_trivial_iff_map_one_eq_zero /-
 /-- `f : α →+* β` has a trivial codomain iff `f 1 = 0`. -/
 theorem codomain_trivial_iff_map_one_eq_zero : (0 : β) = 1 ↔ f 1 = 0 := by rw [map_one, eq_comm]
 #align ring_hom.codomain_trivial_iff_map_one_eq_zero RingHom.codomain_trivial_iff_map_one_eq_zero
+-/
 
+#print RingHom.codomain_trivial_iff_range_trivial /-
 /-- `f : α →+* β` has a trivial codomain iff it has a trivial range. -/
 theorem codomain_trivial_iff_range_trivial : (0 : β) = 1 ↔ ∀ x, f x = 0 :=
   f.codomain_trivial_iff_map_one_eq_zero.trans
     ⟨fun h x => by rw [← mul_one x, map_mul, h, MulZeroClass.mul_zero], fun h => h 1⟩
 #align ring_hom.codomain_trivial_iff_range_trivial RingHom.codomain_trivial_iff_range_trivial
+-/
 
+#print RingHom.codomain_trivial_iff_range_eq_singleton_zero /-
 /-- `f : α →+* β` has a trivial codomain iff its range is `{0}`. -/
 theorem codomain_trivial_iff_range_eq_singleton_zero : (0 : β) = 1 ↔ Set.range f = {0} :=
   f.codomain_trivial_iff_range_trivial.trans
@@ -640,11 +737,14 @@ theorem codomain_trivial_iff_range_eq_singleton_zero : (0 : β) = 1 ↔ Set.rang
       Set.ext fun y => ⟨fun ⟨x, hx⟩ => by simp [← hx, h x], fun hy => ⟨0, by simpa using hy.symm⟩⟩,
       fun h x => Set.mem_singleton_iff.mp (h ▸ Set.mem_range_self x)⟩
 #align ring_hom.codomain_trivial_iff_range_eq_singleton_zero RingHom.codomain_trivial_iff_range_eq_singleton_zero
+-/
 
+#print RingHom.map_one_ne_zero /-
 /-- `f : α →+* β` doesn't map `1` to `0` if `β` is nontrivial -/
 theorem map_one_ne_zero [Nontrivial β] : f 1 ≠ 0 :=
   mt f.codomain_trivial_iff_map_one_eq_zero.mpr zero_ne_one
 #align ring_hom.map_one_ne_zero RingHom.map_one_ne_zero
+-/
 
 #print RingHom.domain_nontrivial /-
 /-- If there is a homomorphism `f : α →+* β` and `β` is nontrivial, then `α` is nontrivial. -/
@@ -653,41 +753,53 @@ theorem domain_nontrivial [Nontrivial β] : Nontrivial α :=
 #align ring_hom.domain_nontrivial RingHom.domain_nontrivial
 -/
 
+#print RingHom.codomain_trivial /-
 theorem codomain_trivial (f : α →+* β) [h : Subsingleton α] : Subsingleton β :=
   (subsingleton_or_nontrivial β).resolve_right fun _ =>
     not_nontrivial_iff_subsingleton.mpr h f.domain_nontrivial
 #align ring_hom.codomain_trivial RingHom.codomain_trivial
+-/
 
 end
 
+#print RingHom.map_neg /-
 /-- Ring homomorphisms preserve additive inverse. -/
 protected theorem map_neg [NonAssocRing α] [NonAssocRing β] (f : α →+* β) (x : α) : f (-x) = -f x :=
   map_neg f x
 #align ring_hom.map_neg RingHom.map_neg
+-/
 
+#print RingHom.map_sub /-
 /-- Ring homomorphisms preserve subtraction. -/
 protected theorem map_sub [NonAssocRing α] [NonAssocRing β] (f : α →+* β) (x y : α) :
     f (x - y) = f x - f y :=
   map_sub f x y
 #align ring_hom.map_sub RingHom.map_sub
+-/
 
+#print RingHom.mk' /-
 /-- Makes a ring homomorphism from a monoid homomorphism of rings which preserves addition. -/
 def mk' [NonAssocSemiring α] [NonAssocRing β] (f : α →* β)
     (map_add : ∀ a b, f (a + b) = f a + f b) : α →+* β :=
   { AddMonoidHom.mk' f map_add, f with }
 #align ring_hom.mk' RingHom.mk'
+-/
 
 section Semiring
 
 variable [Semiring α] [Semiring β]
 
+#print RingHom.isUnit_map /-
 theorem isUnit_map (f : α →+* β) {a : α} : IsUnit a → IsUnit (f a) :=
   IsUnit.map f
 #align ring_hom.is_unit_map RingHom.isUnit_map
+-/
 
+#print RingHom.map_dvd /-
 protected theorem map_dvd (f : α →+* β) {a b : α} : a ∣ b → f a ∣ f b :=
   map_dvd f
 #align ring_hom.map_dvd RingHom.map_dvd
+-/
 
 end Semiring
 
@@ -698,30 +810,32 @@ def id (α : Type _) [NonAssocSemiring α] : α →+* α := by
 #align ring_hom.id RingHom.id
 -/
 
-include rα
-
 instance : Inhabited (α →+* α) :=
   ⟨id α⟩
 
+#print RingHom.id_apply /-
 @[simp]
 theorem id_apply (x : α) : RingHom.id α x = x :=
   rfl
 #align ring_hom.id_apply RingHom.id_apply
+-/
 
+#print RingHom.coe_addMonoidHom_id /-
 @[simp]
 theorem coe_addMonoidHom_id : (id α : α →+ α) = AddMonoidHom.id α :=
   rfl
 #align ring_hom.coe_add_monoid_hom_id RingHom.coe_addMonoidHom_id
+-/
 
+#print RingHom.coe_monoidHom_id /-
 @[simp]
 theorem coe_monoidHom_id : (id α : α →* α) = MonoidHom.id α :=
   rfl
 #align ring_hom.coe_monoid_hom_id RingHom.coe_monoidHom_id
+-/
 
 variable {rγ : NonAssocSemiring γ}
 
-include rβ rγ
-
 #print RingHom.comp /-
 /-- Composition of ring homomorphisms is a ring homomorphism. -/
 def comp (g : β →+* γ) (f : α →+* β) : α →+* γ :=
@@ -732,35 +846,41 @@ def comp (g : β →+* γ) (f : α →+* β) : α →+* γ :=
 #align ring_hom.comp RingHom.comp
 -/
 
+#print RingHom.comp_assoc /-
 /-- Composition of semiring homomorphisms is associative. -/
 theorem comp_assoc {δ} {rδ : NonAssocSemiring δ} (f : α →+* β) (g : β →+* γ) (h : γ →+* δ) :
     (h.comp g).comp f = h.comp (g.comp f) :=
   rfl
 #align ring_hom.comp_assoc RingHom.comp_assoc
+-/
 
+#print RingHom.coe_comp /-
 @[simp]
 theorem coe_comp (hnp : β →+* γ) (hmn : α →+* β) : (hnp.comp hmn : α → γ) = hnp ∘ hmn :=
   rfl
 #align ring_hom.coe_comp RingHom.coe_comp
+-/
 
+#print RingHom.comp_apply /-
 theorem comp_apply (hnp : β →+* γ) (hmn : α →+* β) (x : α) :
     (hnp.comp hmn : α → γ) x = hnp (hmn x) :=
   rfl
 #align ring_hom.comp_apply RingHom.comp_apply
+-/
 
-omit rγ
-
+#print RingHom.comp_id /-
 @[simp]
 theorem comp_id (f : α →+* β) : f.comp (id α) = f :=
   ext fun x => rfl
 #align ring_hom.comp_id RingHom.comp_id
+-/
 
+#print RingHom.id_comp /-
 @[simp]
 theorem id_comp (f : α →+* β) : (id β).comp f = f :=
   ext fun x => rfl
 #align ring_hom.id_comp RingHom.id_comp
-
-omit rβ
+-/
 
 instance : Monoid (α →+* α) where
   one := id α
@@ -769,38 +889,49 @@ instance : Monoid (α →+* α) where
   one_mul := id_comp
   mul_assoc f g h := comp_assoc _ _ _
 
+#print RingHom.one_def /-
 theorem one_def : (1 : α →+* α) = id α :=
   rfl
 #align ring_hom.one_def RingHom.one_def
+-/
 
+#print RingHom.mul_def /-
 theorem mul_def (f g : α →+* α) : f * g = f.comp g :=
   rfl
 #align ring_hom.mul_def RingHom.mul_def
+-/
 
+#print RingHom.coe_one /-
 @[simp]
 theorem coe_one : ⇑(1 : α →+* α) = id :=
   rfl
 #align ring_hom.coe_one RingHom.coe_one
+-/
 
+#print RingHom.coe_mul /-
 @[simp]
 theorem coe_mul (f g : α →+* α) : ⇑(f * g) = f ∘ g :=
   rfl
 #align ring_hom.coe_mul RingHom.coe_mul
+-/
 
-include rβ rγ
-
+#print RingHom.cancel_right /-
 theorem cancel_right {g₁ g₂ : β →+* γ} {f : α →+* β} (hf : Surjective f) :
     g₁.comp f = g₂.comp f ↔ g₁ = g₂ :=
   ⟨fun h => RingHom.ext <| hf.forall.2 (ext_iff.1 h), fun h => h ▸ rfl⟩
 #align ring_hom.cancel_right RingHom.cancel_right
+-/
 
+#print RingHom.cancel_left /-
 theorem cancel_left {g : β →+* γ} {f₁ f₂ : α →+* β} (hg : Injective g) :
     g.comp f₁ = g.comp f₂ ↔ f₁ = f₂ :=
   ⟨fun h => RingHom.ext fun x => hg <| by rw [← comp_apply, h, comp_apply], fun h => h ▸ rfl⟩
 #align ring_hom.cancel_left RingHom.cancel_left
+-/
 
 end RingHom
 
+#print Function.Injective.isDomain /-
 /-- Pullback `is_domain` instance along an injective function. -/
 protected theorem Function.Injective.isDomain [Ring α] [IsDomain α] [Ring β] (f : β →+* α)
     (hf : Injective f) : IsDomain β :=
@@ -810,11 +941,13 @@ protected theorem Function.Injective.isDomain [Ring α] [IsDomain α] [Ring β]
   haveI := hf.no_zero_divisors f f.map_zero f.map_mul
   exact NoZeroDivisors.to_isDomain β
 #align function.injective.is_domain Function.Injective.isDomain
+-/
 
 namespace AddMonoidHom
 
 variable [CommRing α] [IsDomain α] [CommRing β] (f : β →+ α)
 
+#print AddMonoidHom.mkRingHomOfMulSelfOfTwoNeZero /-
 /-- Make a ring homomorphism from an additive group homomorphism from a commutative ring to an
 integral domain that commutes with self multiplication, assumes that two is nonzero and `1` is sent
 to `1`. -/
@@ -832,17 +965,22 @@ def mkRingHomOfMulSelfOfTwoNeZero (h : ∀ x, f (x * x) = f x * f x) (h_two : (2
         or_iff_not_imp_left] at hxy 
       exact hxy h_two }
 #align add_monoid_hom.mk_ring_hom_of_mul_self_of_two_ne_zero AddMonoidHom.mkRingHomOfMulSelfOfTwoNeZero
+-/
 
+#print AddMonoidHom.coe_fn_mkRingHomOfMulSelfOfTwoNeZero /-
 @[simp]
 theorem coe_fn_mkRingHomOfMulSelfOfTwoNeZero (h h_two h_one) :
     (f.mkRingHomOfMulSelfOfTwoNeZero h h_two h_one : β → α) = f :=
   rfl
 #align add_monoid_hom.coe_fn_mk_ring_hom_of_mul_self_of_two_ne_zero AddMonoidHom.coe_fn_mkRingHomOfMulSelfOfTwoNeZero
+-/
 
+#print AddMonoidHom.coe_addMonoidHom_mkRingHomOfMulSelfOfTwoNeZero /-
 @[simp]
 theorem coe_addMonoidHom_mkRingHomOfMulSelfOfTwoNeZero (h h_two h_one) :
     (f.mkRingHomOfMulSelfOfTwoNeZero h h_two h_one : β →+ α) = f := by ext; rfl
 #align add_monoid_hom.coe_add_monoid_hom_mk_ring_hom_of_mul_self_of_two_ne_zero AddMonoidHom.coe_addMonoidHom_mkRingHomOfMulSelfOfTwoNeZero
+-/
 
 end AddMonoidHom
 

mathlib commit https://github.com/leanprover-community/mathlib/commit/cca40788df1b8755d5baf17ab2f27dacc2e17acb

@@ -69,7 +69,7 @@ you should parametrize over `(F : Type*) [non_unital_ring_hom_class F α β] (f
 
 When you extend this structure, make sure to extend `non_unital_ring_hom_class`. -/
 structure NonUnitalRingHom (α β : Type _) [NonUnitalNonAssocSemiring α]
-  [NonUnitalNonAssocSemiring β] extends α →ₙ* β, α →+ β
+    [NonUnitalNonAssocSemiring β] extends α →ₙ* β, α →+ β
 #align non_unital_ring_hom NonUnitalRingHom
 -/
 
@@ -90,7 +90,7 @@ section NonUnitalRingHomClass
 /-- `non_unital_ring_hom_class F α β` states that `F` is a type of non-unital (semi)ring
 homomorphisms. You should extend this class when you extend `non_unital_ring_hom`. -/
 class NonUnitalRingHomClass (F : Type _) (α β : outParam (Type _)) [NonUnitalNonAssocSemiring α]
-  [NonUnitalNonAssocSemiring β] extends MulHomClass F α β, AddMonoidHomClass F α β
+    [NonUnitalNonAssocSemiring β] extends MulHomClass F α β, AddMonoidHomClass F α β
 #align non_unital_ring_hom_class NonUnitalRingHomClass
 -/
 
@@ -220,7 +220,7 @@ end
 #print NonUnitalRingHom.id /-
 /-- The identity non-unital ring homomorphism from a non-unital semiring to itself. -/
 protected def id (α : Type _) [NonUnitalNonAssocSemiring α] : α →ₙ+* α := by
-  refine' { toFun := id.. } <;> intros <;> rfl
+  refine' { toFun := id .. } <;> intros <;> rfl
 #align non_unital_ring_hom.id NonUnitalRingHom.id
 -/
 
@@ -374,7 +374,7 @@ end NonUnitalRingHom
 This extends from both `monoid_hom` and `monoid_with_zero_hom` in order to put the fields in a
 sensible order, even though `monoid_with_zero_hom` already extends `monoid_hom`. -/
 structure RingHom (α : Type _) (β : Type _) [NonAssocSemiring α] [NonAssocSemiring β] extends
-  α →* β, α →+ β, α →ₙ+* β, α →*₀ β
+    α →* β, α →+ β, α →ₙ+* β, α →*₀ β
 #align ring_hom RingHom
 -/
 
@@ -407,8 +407,8 @@ This extends from both `monoid_hom_class` and `monoid_with_zero_hom_class` in
 order to put the fields in a sensible order, even though
 `monoid_with_zero_hom_class` already extends `monoid_hom_class`. -/
 class RingHomClass (F : Type _) (α β : outParam (Type _)) [NonAssocSemiring α]
-  [NonAssocSemiring β] extends MonoidHomClass F α β, AddMonoidHomClass F α β,
-  MonoidWithZeroHomClass F α β
+    [NonAssocSemiring β] extends MonoidHomClass F α β, AddMonoidHomClass F α β,
+    MonoidWithZeroHomClass F α β
 #align ring_hom_class RingHomClass
 -/
 
@@ -694,7 +694,7 @@ end Semiring
 #print RingHom.id /-
 /-- The identity ring homomorphism from a semiring to itself. -/
 def id (α : Type _) [NonAssocSemiring α] : α →+* α := by
-  refine' { toFun := id.. } <;> intros <;> rfl
+  refine' { toFun := id .. } <;> intros <;> rfl
 #align ring_hom.id RingHom.id
 -/
 
@@ -826,10 +826,10 @@ def mkRingHomOfMulSelfOfTwoNeZero (h : ∀ x, f (x * x) = f x * f x) (h_two : (2
       have hxy := h (x + y)
       rw [mul_add, add_mul, add_mul, f.map_add, f.map_add, f.map_add, f.map_add, h x, h y, add_mul,
         mul_add, mul_add, ← sub_eq_zero, add_comm, ← sub_sub, ← sub_sub, ← sub_sub, mul_comm y x,
-        mul_comm (f y) (f x)] at hxy
-      simp only [add_assoc, add_sub_assoc, add_sub_cancel'_right] at hxy
+        mul_comm (f y) (f x)] at hxy 
+      simp only [add_assoc, add_sub_assoc, add_sub_cancel'_right] at hxy 
       rw [sub_sub, ← two_mul, ← add_sub_assoc, ← two_mul, ← mul_sub, mul_eq_zero, sub_eq_zero,
-        or_iff_not_imp_left] at hxy
+        or_iff_not_imp_left] at hxy 
       exact hxy h_two }
 #align add_monoid_hom.mk_ring_hom_of_mul_self_of_two_ne_zero AddMonoidHom.mkRingHomOfMulSelfOfTwoNeZero
 

mathlib commit https://github.com/leanprover-community/mathlib/commit/cca40788df1b8755d5baf17ab2f27dacc2e17acb

@@ -132,26 +132,20 @@ directly. -/
 instance : CoeFun (α →ₙ+* β) fun _ => α → β :=
   ⟨NonUnitalRingHom.toFun⟩
 
-/- warning: non_unital_ring_hom.to_fun_eq_coe clashes with [anonymous] -> [anonymous]
-Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.to_fun_eq_coe [anonymous]ₓ'. -/
 @[simp]
-theorem [anonymous] (f : α →ₙ+* β) : f.toFun = f :=
+theorem toFun_eq_coe (f : α →ₙ+* β) : f.toFun = f :=
   rfl
-#align non_unital_ring_hom.to_fun_eq_coe [anonymous]
+#align non_unital_ring_hom.to_fun_eq_coe NonUnitalRingHom.toFun_eq_coe
 
-/- warning: non_unital_ring_hom.coe_mk clashes with [anonymous] -> [anonymous]
-Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.coe_mk [anonymous]ₓ'. -/
 @[simp]
-theorem [anonymous] (f : α → β) (h₁ h₂ h₃) : ⇑(⟨f, h₁, h₂, h₃⟩ : α →ₙ+* β) = f :=
+theorem coe_mk (f : α → β) (h₁ h₂ h₃) : ⇑(⟨f, h₁, h₂, h₃⟩ : α →ₙ+* β) = f :=
   rfl
-#align non_unital_ring_hom.coe_mk [anonymous]
+#align non_unital_ring_hom.coe_mk NonUnitalRingHom.coe_mk
 
-/- warning: non_unital_ring_hom.coe_coe clashes with [anonymous] -> [anonymous]
-Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.coe_coe [anonymous]ₓ'. -/
 @[simp]
-theorem [anonymous] [NonUnitalRingHomClass F α β] (f : F) : ((f : α →ₙ+* β) : α → β) = f :=
+theorem coe_coe [NonUnitalRingHomClass F α β] (f : F) : ((f : α →ₙ+* β) : α → β) = f :=
   rfl
-#align non_unital_ring_hom.coe_coe [anonymous]
+#align non_unital_ring_hom.coe_coe NonUnitalRingHom.coe_coe
 
 @[simp]
 theorem coe_toMulHom (f : α →ₙ+* β) : ⇑f.toMulHom = f :=
@@ -493,12 +487,10 @@ instance coeToMonoidHom : Coe (α →+* β) (α →* β) :=
 #align ring_hom.has_coe_monoid_hom RingHom.coeToMonoidHom
 -/
 
-/- warning: ring_hom.coe_monoid_hom clashes with [anonymous] -> [anonymous]
-Case conversion may be inaccurate. Consider using '#align ring_hom.coe_monoid_hom [anonymous]ₓ'. -/
 @[simp, norm_cast]
-theorem [anonymous] (f : α →+* β) : ⇑(f : α →* β) = f :=
+theorem coe_monoidHom (f : α →+* β) : ⇑(f : α →* β) = f :=
   rfl
-#align ring_hom.coe_monoid_hom [anonymous]
+#align ring_hom.coe_monoid_hom RingHom.coe_monoidHom
 
 @[simp]
 theorem toMonoidHom_eq_coe (f : α →+* β) : f.toMonoidHom = f :=
@@ -516,12 +508,10 @@ theorem coe_monoidHom_mk (f : α → β) (h₁ h₂ h₃ h₄) :
   rfl
 #align ring_hom.coe_monoid_hom_mk RingHom.coe_monoidHom_mk
 
-/- warning: ring_hom.coe_add_monoid_hom clashes with [anonymous] -> [anonymous]
-Case conversion may be inaccurate. Consider using '#align ring_hom.coe_add_monoid_hom [anonymous]ₓ'. -/
 @[simp, norm_cast]
-theorem [anonymous] (f : α →+* β) : ⇑(f : α →+ β) = f :=
+theorem coe_addMonoidHom (f : α →+* β) : ⇑(f : α →+ β) = f :=
   rfl
-#align ring_hom.coe_add_monoid_hom [anonymous]
+#align ring_hom.coe_add_monoid_hom RingHom.coe_addMonoidHom
 
 @[simp]
 theorem toAddMonoidHom_eq_coe (f : α →+* β) : f.toAddMonoidHom = f :=

mathlib commit https://github.com/leanprover-community/mathlib/commit/917c3c072e487b3cccdbfeff17e75b40e45f66cb

@@ -133,11 +133,6 @@ instance : CoeFun (α →ₙ+* β) fun _ => α → β :=
   ⟨NonUnitalRingHom.toFun⟩
 
 /- warning: non_unital_ring_hom.to_fun_eq_coe clashes with [anonymous] -> [anonymous]
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 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.to_fun_eq_coe [anonymous]ₓ'. -/
 @[simp]
 theorem [anonymous] (f : α →ₙ+* β) : f.toFun = f :=
@@ -145,11 +140,6 @@ theorem [anonymous] (f : α →ₙ+* β) : f.toFun = f :=
 #align non_unital_ring_hom.to_fun_eq_coe [anonymous]
 
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 @[simp]
 theorem [anonymous] (f : α → β) (h₁ h₂ h₃) : ⇑(⟨f, h₁, h₂, h₃⟩ : α →ₙ+* β) = f :=
@@ -157,91 +147,44 @@ theorem [anonymous] (f : α → β) (h₁ h₂ h₃) : ⇑(⟨f, h₁, h₂, h
 #align non_unital_ring_hom.coe_mk [anonymous]
 
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 @[simp]
 theorem [anonymous] [NonUnitalRingHomClass F α β] (f : F) : ((f : α →ₙ+* β) : α → β) = f :=
   rfl
 #align non_unital_ring_hom.coe_coe [anonymous]
 
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 @[simp]
 theorem coe_toMulHom (f : α →ₙ+* β) : ⇑f.toMulHom = f :=
   rfl
 #align non_unital_ring_hom.coe_to_mul_hom NonUnitalRingHom.coe_toMulHom
 
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 @[simp]
 theorem coe_mulHom_mk (f : α → β) (h₁ h₂ h₃) : ((⟨f, h₁, h₂, h₃⟩ : α →ₙ+* β) : α →ₙ* β) = ⟨f, h₁⟩ :=
   rfl
 #align non_unital_ring_hom.coe_mul_hom_mk NonUnitalRingHom.coe_mulHom_mk
 
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 @[simp]
 theorem coe_toAddMonoidHom (f : α →ₙ+* β) : ⇑f.toAddMonoidHom = f :=
   rfl
 #align non_unital_ring_hom.coe_to_add_monoid_hom NonUnitalRingHom.coe_toAddMonoidHom
 
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 @[simp]
 theorem coe_addMonoidHom_mk (f : α → β) (h₁ h₂ h₃) :
     ((⟨f, h₁, h₂, h₃⟩ : α →ₙ+* β) : α →+ β) = ⟨f, h₂, h₃⟩ :=
   rfl
 #align non_unital_ring_hom.coe_add_monoid_hom_mk NonUnitalRingHom.coe_addMonoidHom_mk
 
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 /-- Copy of a `ring_hom` with a new `to_fun` equal to the old one. Useful to fix definitional
 equalities. -/
 protected def copy (f : α →ₙ+* β) (f' : α → β) (h : f' = f) : α →ₙ+* β :=
   { f.toMulHom.copy f' h, f.toAddMonoidHom.copy f' h with }
 #align non_unital_ring_hom.copy NonUnitalRingHom.copy
 
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 @[simp]
 theorem coe_copy (f : α →ₙ+* β) (f' : α → β) (h : f' = f) : ⇑(f.copy f' h) = f' :=
   rfl
 #align non_unital_ring_hom.coe_copy NonUnitalRingHom.coe_copy
 
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 theorem copy_eq (f : α →ₙ+* β) (f' : α → β) (h : f' = f) : f.copy f' h = f :=
   FunLike.ext' h
 #align non_unital_ring_hom.copy_eq NonUnitalRingHom.copy_eq
@@ -256,54 +199,24 @@ include rα rβ
 
 variable (f : α →ₙ+* β) {x y : α} {rα rβ}
 
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 @[ext]
 theorem ext ⦃f g : α →ₙ+* β⦄ : (∀ x, f x = g x) → f = g :=
   FunLike.ext _ _
 #align non_unital_ring_hom.ext NonUnitalRingHom.ext
 
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 theorem ext_iff {f g : α →ₙ+* β} : f = g ↔ ∀ x, f x = g x :=
   FunLike.ext_iff
 #align non_unital_ring_hom.ext_iff NonUnitalRingHom.ext_iff
 
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 @[simp]
 theorem mk_coe (f : α →ₙ+* β) (h₁ h₂ h₃) : NonUnitalRingHom.mk f h₁ h₂ h₃ = f :=
   ext fun _ => rfl
 #align non_unital_ring_hom.mk_coe NonUnitalRingHom.mk_coe
 
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 theorem coe_addMonoidHom_injective : Injective (coe : (α →ₙ+* β) → α →+ β) := fun f g h =>
   ext <| AddMonoidHom.congr_fun h
 #align non_unital_ring_hom.coe_add_monoid_hom_injective NonUnitalRingHom.coe_addMonoidHom_injective
 
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 theorem coe_mulHom_injective : Injective (coe : (α →ₙ+* β) → α →ₙ* β) := fun f g h =>
   ext <| MulHom.congr_fun h
 #align non_unital_ring_hom.coe_mul_hom_injective NonUnitalRingHom.coe_mulHom_injective
@@ -328,23 +241,11 @@ instance : Zero (α →ₙ+* β) :=
 instance : Inhabited (α →ₙ+* β) :=
   ⟨0⟩
 
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 @[simp]
 theorem coe_zero : ⇑(0 : α →ₙ+* β) = 0 :=
   rfl
 #align non_unital_ring_hom.coe_zero NonUnitalRingHom.coe_zero
 
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 @[simp]
 theorem zero_apply (x : α) : (0 : α →ₙ+* β) x = 0 :=
   rfl
@@ -352,34 +253,16 @@ theorem zero_apply (x : α) : (0 : α →ₙ+* β) x = 0 :=
 
 omit rβ
 
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 @[simp]
 theorem id_apply (x : α) : NonUnitalRingHom.id α x = x :=
   rfl
 #align non_unital_ring_hom.id_apply NonUnitalRingHom.id_apply
 
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 @[simp]
 theorem coe_addMonoidHom_id : (NonUnitalRingHom.id α : α →+ α) = AddMonoidHom.id α :=
   rfl
 #align non_unital_ring_hom.coe_add_monoid_hom_id NonUnitalRingHom.coe_addMonoidHom_id
 
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 @[simp]
 theorem coe_mulHom_id : (NonUnitalRingHom.id α : α →ₙ* α) = MulHom.id α :=
   rfl
@@ -396,100 +279,49 @@ def comp (g : β →ₙ+* γ) (f : α →ₙ+* β) : α →ₙ+* γ :=
 #align non_unital_ring_hom.comp NonUnitalRingHom.comp
 -/
 
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 /-- Composition of non-unital ring homomorphisms is associative. -/
 theorem comp_assoc {δ} {rδ : NonUnitalNonAssocSemiring δ} (f : α →ₙ+* β) (g : β →ₙ+* γ)
     (h : γ →ₙ+* δ) : (h.comp g).comp f = h.comp (g.comp f) :=
   rfl
 #align non_unital_ring_hom.comp_assoc NonUnitalRingHom.comp_assoc
 
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 @[simp]
 theorem coe_comp (g : β →ₙ+* γ) (f : α →ₙ+* β) : ⇑(g.comp f) = g ∘ f :=
   rfl
 #align non_unital_ring_hom.coe_comp NonUnitalRingHom.coe_comp
 
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 @[simp]
 theorem comp_apply (g : β →ₙ+* γ) (f : α →ₙ+* β) (x : α) : g.comp f x = g (f x) :=
   rfl
 #align non_unital_ring_hom.comp_apply NonUnitalRingHom.comp_apply
 
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 @[simp]
 theorem coe_comp_addMonoidHom (g : β →ₙ+* γ) (f : α →ₙ+* β) :
     (g.comp f : α →+ γ) = (g : β →+ γ).comp f :=
   rfl
 #align non_unital_ring_hom.coe_comp_add_monoid_hom NonUnitalRingHom.coe_comp_addMonoidHom
 
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 @[simp]
 theorem coe_comp_mulHom (g : β →ₙ+* γ) (f : α →ₙ+* β) :
     (g.comp f : α →ₙ* γ) = (g : β →ₙ* γ).comp f :=
   rfl
 #align non_unital_ring_hom.coe_comp_mul_hom NonUnitalRingHom.coe_comp_mulHom
 
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 @[simp]
 theorem comp_zero (g : β →ₙ+* γ) : g.comp (0 : α →ₙ+* β) = 0 := by ext; simp
 #align non_unital_ring_hom.comp_zero NonUnitalRingHom.comp_zero
 
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 @[simp]
 theorem zero_comp (f : α →ₙ+* β) : (0 : β →ₙ+* γ).comp f = 0 := by ext; rfl
 #align non_unital_ring_hom.zero_comp NonUnitalRingHom.zero_comp
 
 omit rγ
 
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 @[simp]
 theorem comp_id (f : α →ₙ+* β) : f.comp (NonUnitalRingHom.id α) = f :=
   ext fun x => rfl
 #align non_unital_ring_hom.comp_id NonUnitalRingHom.comp_id
 
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 @[simp]
 theorem id_comp (f : α →ₙ+* β) : (NonUnitalRingHom.id β).comp f = f :=
   ext fun x => rfl
@@ -508,43 +340,19 @@ instance : MonoidWithZero (α →ₙ+* α)
   mul_zero := comp_zero
   zero_mul := zero_comp
 
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 theorem one_def : (1 : α →ₙ+* α) = NonUnitalRingHom.id α :=
   rfl
 #align non_unital_ring_hom.one_def NonUnitalRingHom.one_def
 
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 @[simp]
 theorem coe_one : ⇑(1 : α →ₙ+* α) = id :=
   rfl
 #align non_unital_ring_hom.coe_one NonUnitalRingHom.coe_one
 
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 theorem mul_def (f g : α →ₙ+* α) : f * g = f.comp g :=
   rfl
 #align non_unital_ring_hom.mul_def NonUnitalRingHom.mul_def
 
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 @[simp]
 theorem coe_mul (f g : α →ₙ+* α) : ⇑(f * g) = f ∘ g :=
   rfl
@@ -552,23 +360,11 @@ theorem coe_mul (f g : α →ₙ+* α) : ⇑(f * g) = f ∘ g :=
 
 include rβ rγ
 
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 theorem cancel_right {g₁ g₂ : β →ₙ+* γ} {f : α →ₙ+* β} (hf : Surjective f) :
     g₁.comp f = g₂.comp f ↔ g₁ = g₂ :=
   ⟨fun h => ext <| hf.forall.2 (ext_iff.1 h), fun h => h ▸ rfl⟩
 #align non_unital_ring_hom.cancel_right NonUnitalRingHom.cancel_right
 
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 theorem cancel_left {g : β →ₙ+* γ} {f₁ f₂ : α →ₙ+* β} (hg : Injective g) :
     g.comp f₁ = g.comp f₂ ↔ f₁ = f₂ :=
   ⟨fun h => ext fun x => hg <| by rw [← comp_apply, h, comp_apply], fun h => h ▸ rfl⟩
@@ -624,12 +420,6 @@ class RingHomClass (F : Type _) (α β : outParam (Type _)) [NonAssocSemiring α
 
 variable [NonAssocSemiring α] [NonAssocSemiring β] [RingHomClass F α β]
 
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 /-- Ring homomorphisms preserve `bit1`. -/
 @[simp]
 theorem map_bit1 (f : F) (a : α) : (f (bit1 a) : β) = bit1 (f a) := by simp [bit1]
@@ -682,34 +472,16 @@ instance : CoeFun (α →+* β) fun _ => α → β :=
 
 initialize_simps_projections RingHom (toFun → apply)
 
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 @[simp]
 theorem toFun_eq_coe (f : α →+* β) : f.toFun = f :=
   rfl
 #align ring_hom.to_fun_eq_coe RingHom.toFun_eq_coe
 
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 @[simp]
 theorem coe_mk (f : α → β) (h₁ h₂ h₃ h₄) : ⇑(⟨f, h₁, h₂, h₃, h₄⟩ : α →+* β) = f :=
   rfl
 #align ring_hom.coe_mk RingHom.coe_mk
 
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 @[simp]
 theorem coe_coe {F : Type _} [RingHomClass F α β] (f : F) : ((f : α →+* β) : α → β) = f :=
   rfl
@@ -722,45 +494,22 @@ instance coeToMonoidHom : Coe (α →+* β) (α →* β) :=
 -/
 
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 @[simp, norm_cast]
 theorem [anonymous] (f : α →+* β) : ⇑(f : α →* β) = f :=
   rfl
 #align ring_hom.coe_monoid_hom [anonymous]
 
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 @[simp]
 theorem toMonoidHom_eq_coe (f : α →+* β) : f.toMonoidHom = f :=
   rfl
 #align ring_hom.to_monoid_hom_eq_coe RingHom.toMonoidHom_eq_coe
 
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 @[simp]
 theorem toMonoidWithZeroHom_eq_coe (f : α →+* β) : (f.toMonoidWithZeroHom : α → β) = f :=
   rfl
 #align ring_hom.to_monoid_with_zero_hom_eq_coe RingHom.toMonoidWithZeroHom_eq_coe
 
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 @[simp]
 theorem coe_monoidHom_mk (f : α → β) (h₁ h₂ h₃ h₄) :
     ((⟨f, h₁, h₂, h₃, h₄⟩ : α →+* β) : α →* β) = ⟨f, h₁, h₂⟩ :=
@@ -768,66 +517,34 @@ theorem coe_monoidHom_mk (f : α → β) (h₁ h₂ h₃ h₄) :
 #align ring_hom.coe_monoid_hom_mk RingHom.coe_monoidHom_mk
 
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 @[simp, norm_cast]
 theorem [anonymous] (f : α →+* β) : ⇑(f : α →+ β) = f :=
   rfl
 #align ring_hom.coe_add_monoid_hom [anonymous]
 
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 @[simp]
 theorem toAddMonoidHom_eq_coe (f : α →+* β) : f.toAddMonoidHom = f :=
   rfl
 #align ring_hom.to_add_monoid_hom_eq_coe RingHom.toAddMonoidHom_eq_coe
 
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 @[simp]
 theorem coe_addMonoidHom_mk (f : α → β) (h₁ h₂ h₃ h₄) :
     ((⟨f, h₁, h₂, h₃, h₄⟩ : α →+* β) : α →+ β) = ⟨f, h₃, h₄⟩ :=
   rfl
 #align ring_hom.coe_add_monoid_hom_mk RingHom.coe_addMonoidHom_mk
 
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 /-- Copy of a `ring_hom` with a new `to_fun` equal to the old one. Useful to fix definitional
 equalities. -/
 def copy (f : α →+* β) (f' : α → β) (h : f' = f) : α →+* β :=
   { f.toMonoidWithZeroHom.copy f' h, f.toAddMonoidHom.copy f' h with }
 #align ring_hom.copy RingHom.copy
 
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 @[simp]
 theorem coe_copy (f : α →+* β) (f' : α → β) (h : f' = f) : ⇑(f.copy f' h) = f' :=
   rfl
 #align ring_hom.coe_copy RingHom.coe_copy
 
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 theorem copy_eq (f : α →+* β) (f' : α → β) (h : f' = f) : f.copy f' h = f :=
   FunLike.ext' h
 #align ring_hom.copy_eq RingHom.copy_eq
@@ -842,124 +559,55 @@ include rα rβ
 
 variable (f : α →+* β) {x y : α} {rα rβ}
 
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 theorem congr_fun {f g : α →+* β} (h : f = g) (x : α) : f x = g x :=
   FunLike.congr_fun h x
 #align ring_hom.congr_fun RingHom.congr_fun
 
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 theorem congr_arg (f : α →+* β) {x y : α} (h : x = y) : f x = f y :=
   FunLike.congr_arg f h
 #align ring_hom.congr_arg RingHom.congr_arg
 
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 theorem coe_inj ⦃f g : α →+* β⦄ (h : (f : α → β) = g) : f = g :=
   FunLike.coe_injective h
 #align ring_hom.coe_inj RingHom.coe_inj
 
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 @[ext]
 theorem ext ⦃f g : α →+* β⦄ : (∀ x, f x = g x) → f = g :=
   FunLike.ext _ _
 #align ring_hom.ext RingHom.ext
 
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 theorem ext_iff {f g : α →+* β} : f = g ↔ ∀ x, f x = g x :=
   FunLike.ext_iff
 #align ring_hom.ext_iff RingHom.ext_iff
 
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 @[simp]
 theorem mk_coe (f : α →+* β) (h₁ h₂ h₃ h₄) : RingHom.mk f h₁ h₂ h₃ h₄ = f :=
   ext fun _ => rfl
 #align ring_hom.mk_coe RingHom.mk_coe
 
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 theorem coe_addMonoidHom_injective : Injective (coe : (α →+* β) → α →+ β) := fun f g h =>
   ext <| AddMonoidHom.congr_fun h
 #align ring_hom.coe_add_monoid_hom_injective RingHom.coe_addMonoidHom_injective
 
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 theorem coe_monoidHom_injective : Injective (coe : (α →+* β) → α →* β) := fun f g h =>
   ext <| MonoidHom.congr_fun h
 #align ring_hom.coe_monoid_hom_injective RingHom.coe_monoidHom_injective
 
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 /-- Ring homomorphisms map zero to zero. -/
 protected theorem map_zero (f : α →+* β) : f 0 = 0 :=
   map_zero f
 #align ring_hom.map_zero RingHom.map_zero
 
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 /-- Ring homomorphisms map one to one. -/
 protected theorem map_one (f : α →+* β) : f 1 = 1 :=
   map_one f
 #align ring_hom.map_one RingHom.map_one
 
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 /-- Ring homomorphisms preserve addition. -/
 protected theorem map_add (f : α →+* β) : ∀ a b, f (a + b) = f a + f b :=
   map_add f
 #align ring_hom.map_add RingHom.map_add
 
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 /-- Ring homomorphisms preserve multiplication. -/
 protected theorem map_mul (f : α →+* β) : ∀ a b, f (a * b) = f a * f b :=
   map_mul f
@@ -975,56 +623,26 @@ protected theorem map_bit1 (f : α →+* β) : ∀ a, f (bit1 a) = bit1 (f a) :=
   map_bit1 f
 #align ring_hom.map_bit1 RingHom.map_bit1
 
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 @[simp]
 theorem map_ite_zero_one {F : Type _} [RingHomClass F α β] (f : F) (p : Prop) [Decidable p] :
     f (ite p 0 1) = ite p 0 1 := by split_ifs <;> simp [h]
 #align ring_hom.map_ite_zero_one RingHom.map_ite_zero_one
 
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 @[simp]
 theorem map_ite_one_zero {F : Type _} [RingHomClass F α β] (f : F) (p : Prop) [Decidable p] :
     f (ite p 1 0) = ite p 1 0 := by split_ifs <;> simp [h]
 #align ring_hom.map_ite_one_zero RingHom.map_ite_one_zero
 
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 /-- `f : α →+* β` has a trivial codomain iff `f 1 = 0`. -/
 theorem codomain_trivial_iff_map_one_eq_zero : (0 : β) = 1 ↔ f 1 = 0 := by rw [map_one, eq_comm]
 #align ring_hom.codomain_trivial_iff_map_one_eq_zero RingHom.codomain_trivial_iff_map_one_eq_zero
 
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 /-- `f : α →+* β` has a trivial codomain iff it has a trivial range. -/
 theorem codomain_trivial_iff_range_trivial : (0 : β) = 1 ↔ ∀ x, f x = 0 :=
   f.codomain_trivial_iff_map_one_eq_zero.trans
     ⟨fun h x => by rw [← mul_one x, map_mul, h, MulZeroClass.mul_zero], fun h => h 1⟩
 #align ring_hom.codomain_trivial_iff_range_trivial RingHom.codomain_trivial_iff_range_trivial
 
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 /-- `f : α →+* β` has a trivial codomain iff its range is `{0}`. -/
 theorem codomain_trivial_iff_range_eq_singleton_zero : (0 : β) = 1 ↔ Set.range f = {0} :=
   f.codomain_trivial_iff_range_trivial.trans
@@ -1033,12 +651,6 @@ theorem codomain_trivial_iff_range_eq_singleton_zero : (0 : β) = 1 ↔ Set.rang
       fun h x => Set.mem_singleton_iff.mp (h ▸ Set.mem_range_self x)⟩
 #align ring_hom.codomain_trivial_iff_range_eq_singleton_zero RingHom.codomain_trivial_iff_range_eq_singleton_zero
 
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 /-- `f : α →+* β` doesn't map `1` to `0` if `β` is nontrivial -/
 theorem map_one_ne_zero [Nontrivial β] : f 1 ≠ 0 :=
   mt f.codomain_trivial_iff_map_one_eq_zero.mpr zero_ne_one
@@ -1051,12 +663,6 @@ theorem domain_nontrivial [Nontrivial β] : Nontrivial α :=
 #align ring_hom.domain_nontrivial RingHom.domain_nontrivial
 -/
 
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 theorem codomain_trivial (f : α →+* β) [h : Subsingleton α] : Subsingleton β :=
   (subsingleton_or_nontrivial β).resolve_right fun _ =>
     not_nontrivial_iff_subsingleton.mpr h f.domain_nontrivial
@@ -1064,32 +670,17 @@ theorem codomain_trivial (f : α →+* β) [h : Subsingleton α] : Subsingleton
 
 end
 
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 /-- Ring homomorphisms preserve additive inverse. -/
 protected theorem map_neg [NonAssocRing α] [NonAssocRing β] (f : α →+* β) (x : α) : f (-x) = -f x :=
   map_neg f x
 #align ring_hom.map_neg RingHom.map_neg
 
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 /-- Ring homomorphisms preserve subtraction. -/
 protected theorem map_sub [NonAssocRing α] [NonAssocRing β] (f : α →+* β) (x y : α) :
     f (x - y) = f x - f y :=
   map_sub f x y
 #align ring_hom.map_sub RingHom.map_sub
 
-/- warning: ring_hom.mk' -> RingHom.mk' is a dubious translation:
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 /-- Makes a ring homomorphism from a monoid homomorphism of rings which preserves addition. -/
 def mk' [NonAssocSemiring α] [NonAssocRing β] (f : α →* β)
     (map_add : ∀ a b, f (a + b) = f a + f b) : α →+* β :=
@@ -1100,22 +691,10 @@ section Semiring
 
 variable [Semiring α] [Semiring β]
 
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 theorem isUnit_map (f : α →+* β) {a : α} : IsUnit a → IsUnit (f a) :=
   IsUnit.map f
 #align ring_hom.is_unit_map RingHom.isUnit_map
 
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 protected theorem map_dvd (f : α →+* β) {a b : α} : a ∣ b → f a ∣ f b :=
   map_dvd f
 #align ring_hom.map_dvd RingHom.map_dvd
@@ -1134,34 +713,16 @@ include rα
 instance : Inhabited (α →+* α) :=
   ⟨id α⟩
 
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 @[simp]
 theorem id_apply (x : α) : RingHom.id α x = x :=
   rfl
 #align ring_hom.id_apply RingHom.id_apply
 
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 @[simp]
 theorem coe_addMonoidHom_id : (id α : α →+ α) = AddMonoidHom.id α :=
   rfl
 #align ring_hom.coe_add_monoid_hom_id RingHom.coe_addMonoidHom_id
 
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 @[simp]
 theorem coe_monoidHom_id : (id α : α →* α) = MonoidHom.id α :=
   rfl
@@ -1181,35 +742,17 @@ def comp (g : β →+* γ) (f : α →+* β) : α →+* γ :=
 #align ring_hom.comp RingHom.comp
 -/
 
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 /-- Composition of semiring homomorphisms is associative. -/
 theorem comp_assoc {δ} {rδ : NonAssocSemiring δ} (f : α →+* β) (g : β →+* γ) (h : γ →+* δ) :
     (h.comp g).comp f = h.comp (g.comp f) :=
   rfl
 #align ring_hom.comp_assoc RingHom.comp_assoc
 
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 @[simp]
 theorem coe_comp (hnp : β →+* γ) (hmn : α →+* β) : (hnp.comp hmn : α → γ) = hnp ∘ hmn :=
   rfl
 #align ring_hom.coe_comp RingHom.coe_comp
 
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 theorem comp_apply (hnp : β →+* γ) (hmn : α →+* β) (x : α) :
     (hnp.comp hmn : α → γ) x = hnp (hmn x) :=
   rfl
@@ -1217,23 +760,11 @@ theorem comp_apply (hnp : β →+* γ) (hmn : α →+* β) (x : α) :
 
 omit rγ
 
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 @[simp]
 theorem comp_id (f : α →+* β) : f.comp (id α) = f :=
   ext fun x => rfl
 #align ring_hom.comp_id RingHom.comp_id
 
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 @[simp]
 theorem id_comp (f : α →+* β) : (id β).comp f = f :=
   ext fun x => rfl
@@ -1248,43 +779,19 @@ instance : Monoid (α →+* α) where
   one_mul := id_comp
   mul_assoc f g h := comp_assoc _ _ _
 
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 theorem one_def : (1 : α →+* α) = id α :=
   rfl
 #align ring_hom.one_def RingHom.one_def
 
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 theorem mul_def (f g : α →+* α) : f * g = f.comp g :=
   rfl
 #align ring_hom.mul_def RingHom.mul_def
 
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 @[simp]
 theorem coe_one : ⇑(1 : α →+* α) = id :=
   rfl
 #align ring_hom.coe_one RingHom.coe_one
 
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 @[simp]
 theorem coe_mul (f g : α →+* α) : ⇑(f * g) = f ∘ g :=
   rfl
@@ -1292,23 +799,11 @@ theorem coe_mul (f g : α →+* α) : ⇑(f * g) = f ∘ g :=
 
 include rβ rγ
 
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 theorem cancel_right {g₁ g₂ : β →+* γ} {f : α →+* β} (hf : Surjective f) :
     g₁.comp f = g₂.comp f ↔ g₁ = g₂ :=
   ⟨fun h => RingHom.ext <| hf.forall.2 (ext_iff.1 h), fun h => h ▸ rfl⟩
 #align ring_hom.cancel_right RingHom.cancel_right
 
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 theorem cancel_left {g : β →+* γ} {f₁ f₂ : α →+* β} (hg : Injective g) :
     g.comp f₁ = g.comp f₂ ↔ f₁ = f₂ :=
   ⟨fun h => RingHom.ext fun x => hg <| by rw [← comp_apply, h, comp_apply], fun h => h ▸ rfl⟩
@@ -1316,12 +811,6 @@ theorem cancel_left {g : β →+* γ} {f₁ f₂ : α →+* β} (hg : Injective
 
 end RingHom
 
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 /-- Pullback `is_domain` instance along an injective function. -/
 protected theorem Function.Injective.isDomain [Ring α] [IsDomain α] [Ring β] (f : β →+* α)
     (hf : Injective f) : IsDomain β :=
@@ -1336,9 +825,6 @@ namespace AddMonoidHom
 
 variable [CommRing α] [IsDomain α] [CommRing β] (f : β →+ α)
 
-/- warning: add_monoid_hom.mk_ring_hom_of_mul_self_of_two_ne_zero -> AddMonoidHom.mkRingHomOfMulSelfOfTwoNeZero is a dubious translation:
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 /-- Make a ring homomorphism from an additive group homomorphism from a commutative ring to an
 integral domain that commutes with self multiplication, assumes that two is nonzero and `1` is sent
 to `1`. -/
@@ -1357,18 +843,12 @@ def mkRingHomOfMulSelfOfTwoNeZero (h : ∀ x, f (x * x) = f x * f x) (h_two : (2
       exact hxy h_two }
 #align add_monoid_hom.mk_ring_hom_of_mul_self_of_two_ne_zero AddMonoidHom.mkRingHomOfMulSelfOfTwoNeZero
 
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 @[simp]
 theorem coe_fn_mkRingHomOfMulSelfOfTwoNeZero (h h_two h_one) :
     (f.mkRingHomOfMulSelfOfTwoNeZero h h_two h_one : β → α) = f :=
   rfl
 #align add_monoid_hom.coe_fn_mk_ring_hom_of_mul_self_of_two_ne_zero AddMonoidHom.coe_fn_mkRingHomOfMulSelfOfTwoNeZero
 
-/- warning: add_monoid_hom.coe_add_monoid_hom_mk_ring_hom_of_mul_self_of_two_ne_zero -> AddMonoidHom.coe_addMonoidHom_mkRingHomOfMulSelfOfTwoNeZero is a dubious translation:
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 @[simp]
 theorem coe_addMonoidHom_mkRingHomOfMulSelfOfTwoNeZero (h h_two h_one) :
     (f.mkRingHomOfMulSelfOfTwoNeZero h h_two h_one : β →+ α) = f := by ext; rfl

mathlib commit https://github.com/leanprover-community/mathlib/commit/917c3c072e487b3cccdbfeff17e75b40e45f66cb

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 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.comp_zero NonUnitalRingHom.comp_zeroₓ'. -/
 @[simp]
-theorem comp_zero (g : β →ₙ+* γ) : g.comp (0 : α →ₙ+* β) = 0 :=
-  by
-  ext
-  simp
+theorem comp_zero (g : β →ₙ+* γ) : g.comp (0 : α →ₙ+* β) = 0 := by ext; simp
 #align non_unital_ring_hom.comp_zero NonUnitalRingHom.comp_zero
 
 /- warning: non_unital_ring_hom.zero_comp -> NonUnitalRingHom.zero_comp is a dubious translation:
@@ -471,10 +468,7 @@ but is expected to have type
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 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.zero_comp NonUnitalRingHom.zero_compₓ'. -/
 @[simp]
-theorem zero_comp (f : α →ₙ+* β) : (0 : β →ₙ+* γ).comp f = 0 :=
-  by
-  ext
-  rfl
+theorem zero_comp (f : α →ₙ+* β) : (0 : β →ₙ+* γ).comp f = 0 := by ext; rfl
 #align non_unital_ring_hom.zero_comp NonUnitalRingHom.zero_comp
 
 omit rγ
@@ -1377,10 +1371,7 @@ theorem coe_fn_mkRingHomOfMulSelfOfTwoNeZero (h h_two h_one) :
 Case conversion may be inaccurate. Consider using '#align add_monoid_hom.coe_add_monoid_hom_mk_ring_hom_of_mul_self_of_two_ne_zero AddMonoidHom.coe_addMonoidHom_mkRingHomOfMulSelfOfTwoNeZeroₓ'. -/
 @[simp]
 theorem coe_addMonoidHom_mkRingHomOfMulSelfOfTwoNeZero (h h_two h_one) :
-    (f.mkRingHomOfMulSelfOfTwoNeZero h h_two h_one : β →+ α) = f :=
-  by
-  ext
-  rfl
+    (f.mkRingHomOfMulSelfOfTwoNeZero h h_two h_one : β →+ α) = f := by ext; rfl
 #align add_monoid_hom.coe_add_monoid_hom_mk_ring_hom_of_mul_self_of_two_ne_zero AddMonoidHom.coe_addMonoidHom_mkRingHomOfMulSelfOfTwoNeZero
 
 end AddMonoidHom

mathlib commit https://github.com/leanprover-community/mathlib/commit/917c3c072e487b3cccdbfeff17e75b40e45f66cb

@@ -431,10 +431,7 @@ theorem comp_apply (g : β →ₙ+* γ) (f : α →ₙ+* β) (x : α) : g.comp f
 #align non_unital_ring_hom.comp_apply NonUnitalRingHom.comp_apply
 
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+<too large>
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.coe_comp_add_monoid_hom NonUnitalRingHom.coe_comp_addMonoidHomₓ'. -/
 @[simp]
 theorem coe_comp_addMonoidHom (g : β →ₙ+* γ) (f : α →ₙ+* β) :
@@ -800,10 +797,7 @@ theorem toAddMonoidHom_eq_coe (f : α →+* β) : f.toAddMonoidHom = f :=
 #align ring_hom.to_add_monoid_hom_eq_coe RingHom.toAddMonoidHom_eq_coe
 
 /- warning: ring_hom.coe_add_monoid_hom_mk -> RingHom.coe_addMonoidHom_mk is a dubious translation:
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+<too large>
 Case conversion may be inaccurate. Consider using '#align ring_hom.coe_add_monoid_hom_mk RingHom.coe_addMonoidHom_mkₓ'. -/
 @[simp]
 theorem coe_addMonoidHom_mk (f : α → β) (h₁ h₂ h₃ h₄) :
@@ -906,10 +900,7 @@ theorem ext_iff {f g : α →+* β} : f = g ↔ ∀ x, f x = g x :=
 #align ring_hom.ext_iff RingHom.ext_iff
 
 /- warning: ring_hom.mk_coe -> RingHom.mk_coe is a dubious translation:
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 Case conversion may be inaccurate. Consider using '#align ring_hom.mk_coe RingHom.mk_coeₓ'. -/
 @[simp]
 theorem mk_coe (f : α →+* β) (h₁ h₂ h₃ h₄) : RingHom.mk f h₁ h₂ h₃ h₄ = f :=
@@ -1103,10 +1094,7 @@ protected theorem map_sub [NonAssocRing α] [NonAssocRing β] (f : α →+* β)
 #align ring_hom.map_sub RingHom.map_sub
 
 /- warning: ring_hom.mk' -> RingHom.mk' is a dubious translation:
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 Case conversion may be inaccurate. Consider using '#align ring_hom.mk' RingHom.mk'ₓ'. -/
 /-- Makes a ring homomorphism from a monoid homomorphism of rings which preserves addition. -/
 def mk' [NonAssocSemiring α] [NonAssocRing β] (f : α →* β)
@@ -1355,10 +1343,7 @@ namespace AddMonoidHom
 variable [CommRing α] [IsDomain α] [CommRing β] (f : β →+ α)
 
 /- warning: add_monoid_hom.mk_ring_hom_of_mul_self_of_two_ne_zero -> AddMonoidHom.mkRingHomOfMulSelfOfTwoNeZero is a dubious translation:
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+<too large>
 Case conversion may be inaccurate. Consider using '#align add_monoid_hom.mk_ring_hom_of_mul_self_of_two_ne_zero AddMonoidHom.mkRingHomOfMulSelfOfTwoNeZeroₓ'. -/
 /-- Make a ring homomorphism from an additive group homomorphism from a commutative ring to an
 integral domain that commutes with self multiplication, assumes that two is nonzero and `1` is sent
@@ -1379,10 +1364,7 @@ def mkRingHomOfMulSelfOfTwoNeZero (h : ∀ x, f (x * x) = f x * f x) (h_two : (2
 #align add_monoid_hom.mk_ring_hom_of_mul_self_of_two_ne_zero AddMonoidHom.mkRingHomOfMulSelfOfTwoNeZero
 
 /- warning: add_monoid_hom.coe_fn_mk_ring_hom_of_mul_self_of_two_ne_zero -> AddMonoidHom.coe_fn_mkRingHomOfMulSelfOfTwoNeZero is a dubious translation:
-lean 3 declaration is
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+<too large>
 Case conversion may be inaccurate. Consider using '#align add_monoid_hom.coe_fn_mk_ring_hom_of_mul_self_of_two_ne_zero AddMonoidHom.coe_fn_mkRingHomOfMulSelfOfTwoNeZeroₓ'. -/
 @[simp]
 theorem coe_fn_mkRingHomOfMulSelfOfTwoNeZero (h h_two h_one) :
@@ -1391,10 +1373,7 @@ theorem coe_fn_mkRingHomOfMulSelfOfTwoNeZero (h h_two h_one) :
 #align add_monoid_hom.coe_fn_mk_ring_hom_of_mul_self_of_two_ne_zero AddMonoidHom.coe_fn_mkRingHomOfMulSelfOfTwoNeZero
 
 /- warning: add_monoid_hom.coe_add_monoid_hom_mk_ring_hom_of_mul_self_of_two_ne_zero -> AddMonoidHom.coe_addMonoidHom_mkRingHomOfMulSelfOfTwoNeZero is a dubious translation:
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_inst_1)))))) β α (AddZeroClass.toAdd.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3)))))) (AddZeroClass.toAdd.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) (AddMonoidHomClass.toAddHomClass.{max u2 u1, u1, u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β 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α (CommSemiring.toCommMonoidWithZero.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1)))))) (h_one : Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u1} β 1 (One.toOfNat1.{u1} β (Semiring.toOne.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3)))))) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) _x) (AddHomClass.toFunLike.{max u2 u1, u1, u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β α (AddZeroClass.toAdd.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3)))))) (AddZeroClass.toAdd.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) (AddMonoidHomClass.toAddHomClass.{max u2 u1, u1, u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1))))) (AddMonoidHom.addMonoidHomClass.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))))) f (OfNat.ofNat.{u1} β 1 (One.toOfNat1.{u1} β (Semiring.toOne.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3)))))) (OfNat.ofNat.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u1} β 1 (One.toOfNat1.{u1} β (Semiring.toOne.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3)))))) 1 (One.toOfNat1.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u1} β 1 (One.toOfNat1.{u1} β (Semiring.toOne.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3)))))) (Semiring.toOne.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u1} β 1 (One.toOfNat1.{u1} β (Semiring.toOne.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3)))))) (CommSemiring.toSemiring.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u1} β 1 (One.toOfNat1.{u1} β (Semiring.toOne.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3)))))) (CommRing.toCommSemiring.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u1} β 1 (One.toOfNat1.{u1} β (Semiring.toOne.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3)))))) _inst_1)))))), Eq.{max (succ u2) (succ u1)} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) (AddMonoidHomClass.toAddMonoidHom.{u1, u2, max u2 u1} β α (RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3))) (Semiring.toNonAssocSemiring.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1)))) (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1))))) (RingHomClass.toAddMonoidHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3))) (Semiring.toNonAssocSemiring.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1)))) β α (Semiring.toNonAssocSemiring.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3))) (Semiring.toNonAssocSemiring.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1))) (RingHom.instRingHomClassRingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3))) (Semiring.toNonAssocSemiring.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1))))) (AddMonoidHom.mkRingHomOfMulSelfOfTwoNeZero.{u2, u1} α β _inst_1 _inst_2 _inst_3 f h h_two h_one)) f
+<too large>
 Case conversion may be inaccurate. Consider using '#align add_monoid_hom.coe_add_monoid_hom_mk_ring_hom_of_mul_self_of_two_ne_zero AddMonoidHom.coe_addMonoidHom_mkRingHomOfMulSelfOfTwoNeZeroₓ'. -/
 @[simp]
 theorem coe_addMonoidHom_mkRingHomOfMulSelfOfTwoNeZero (h h_two h_one) :

mathlib commit https://github.com/leanprover-community/mathlib/commit/95a87616d63b3cb49d3fe678d416fbe9c4217bf4

@@ -172,7 +172,7 @@ theorem [anonymous] [NonUnitalRingHomClass F α β] (f : F) : ((f : α →ₙ+*
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonUnitalNonAssocSemiring.{u1} α} {rβ : NonUnitalNonAssocSemiring.{u2} β} (f : NonUnitalRingHom.{u1, u2} α β rα rβ), Eq.{max (succ u1) (succ u2)} (α -> β) (coeFn.{max (succ u2) (succ u1), max (succ u1) (succ u2)} (MulHom.{u1, u2} α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) (fun (_x : MulHom.{u1, u2} α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) => α -> β) (MulHom.hasCoeToFun.{u1, u2} α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) (NonUnitalRingHom.toMulHom.{u1, u2} α β rα rβ f)) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f)
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β] (f : NonUnitalRingHom.{u2, u1} α β rα rβ), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (MulHom.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ)) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (MulHom.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ)) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (MulHom.mulHomClass.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ))) (NonUnitalRingHom.toMulHom.{u2, u1} α β rα rβ f)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f)
+  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β] (f : NonUnitalRingHom.{u2, u1} α β rα rβ), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (MulHom.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ)) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (MulHom.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ)) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (MulHom.mulHomClass.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ))) (NonUnitalRingHom.toMulHom.{u2, u1} α β rα rβ f)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f)
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.coe_to_mul_hom NonUnitalRingHom.coe_toMulHomₓ'. -/
 @[simp]
 theorem coe_toMulHom (f : α →ₙ+* β) : ⇑f.toMulHom = f :=
@@ -194,7 +194,7 @@ theorem coe_mulHom_mk (f : α → β) (h₁ h₂ h₃) : ((⟨f, h₁, h₂, h
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonUnitalNonAssocSemiring.{u1} α} {rβ : NonUnitalNonAssocSemiring.{u2} β} (f : NonUnitalRingHom.{u1, u2} α β rα rβ), Eq.{max (succ u1) (succ u2)} (α -> β) (coeFn.{max (succ u2) (succ u1), max (succ u1) (succ u2)} (AddMonoidHom.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) (fun (_x : AddMonoidHom.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) => α -> β) (AddMonoidHom.hasCoeToFun.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) (NonUnitalRingHom.toAddMonoidHom.{u1, u2} α β rα rβ f)) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f)
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β] (f : NonUnitalRingHom.{u2, u1} α β rα rβ), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : α) => β) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (AddMonoidHom.{u2, u1} α β (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ)))) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : α) => β) _x) (AddHomClass.toFunLike.{max u2 u1, u2, u1} (AddMonoidHom.{u2, u1} α β (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ)))) α β (AddZeroClass.toAdd.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα)))) (AddZeroClass.toAdd.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ)))) (AddMonoidHomClass.toAddHomClass.{max u2 u1, u2, u1} (AddMonoidHom.{u2, u1} α β (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ)))) α β (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ))) (AddMonoidHom.addMonoidHomClass.{u2, u1} α β (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ)))))) (NonUnitalRingHom.toAddMonoidHom.{u2, u1} α β rα rβ f)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f)
+  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β] (f : NonUnitalRingHom.{u2, u1} α β rα rβ), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : α) => β) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (AddMonoidHom.{u2, u1} α β (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ)))) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : α) => β) _x) (AddHomClass.toFunLike.{max u2 u1, u2, u1} (AddMonoidHom.{u2, u1} α β (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ)))) α β (AddZeroClass.toAdd.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα)))) (AddZeroClass.toAdd.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ)))) (AddMonoidHomClass.toAddHomClass.{max u2 u1, u2, u1} (AddMonoidHom.{u2, u1} α β (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ)))) α β (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ))) (AddMonoidHom.addMonoidHomClass.{u2, u1} α β (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ)))))) (NonUnitalRingHom.toAddMonoidHom.{u2, u1} α β rα rβ f)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f)
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.coe_to_add_monoid_hom NonUnitalRingHom.coe_toAddMonoidHomₓ'. -/
 @[simp]
 theorem coe_toAddMonoidHom (f : α →ₙ+* β) : ⇑f.toAddMonoidHom = f :=
@@ -217,7 +217,7 @@ theorem coe_addMonoidHom_mk (f : α → β) (h₁ h₂ h₃) :
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonUnitalNonAssocSemiring.{u1} α} {rβ : NonUnitalNonAssocSemiring.{u2} β} (f : NonUnitalRingHom.{u1, u2} α β rα rβ) (f' : α -> β), (Eq.{max (succ u1) (succ u2)} (α -> β) f' (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f)) -> (NonUnitalRingHom.{u1, u2} α β rα rβ)
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] (f : NonUnitalRingHom.{u1, u2} α β rα rβ) (f' : α -> β), (Eq.{max (succ u1) (succ u2)} (α -> β) f' (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} α β rα rβ))) f)) -> (NonUnitalRingHom.{u1, u2} α β rα rβ)
+  forall {α : Type.{u1}} {β : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] (f : NonUnitalRingHom.{u1, u2} α β rα rβ) (f' : α -> β), (Eq.{max (succ u1) (succ u2)} (α -> β) f' (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} α β rα rβ))) f)) -> (NonUnitalRingHom.{u1, u2} α β rα rβ)
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.copy NonUnitalRingHom.copyₓ'. -/
 /-- Copy of a `ring_hom` with a new `to_fun` equal to the old one. Useful to fix definitional
 equalities. -/
@@ -229,7 +229,7 @@ protected def copy (f : α →ₙ+* β) (f' : α → β) (h : f' = f) : α →
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonUnitalNonAssocSemiring.{u1} α} {rβ : NonUnitalNonAssocSemiring.{u2} β} (f : NonUnitalRingHom.{u1, u2} α β rα rβ) (f' : α -> β) (h : Eq.{max (succ u1) (succ u2)} (α -> β) f' (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f)), Eq.{max (succ u1) (succ u2)} (α -> β) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) (NonUnitalRingHom.copy.{u1, u2} α β rα rβ f f' h)) f'
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β] (f : NonUnitalRingHom.{u2, u1} α β rα rβ) (f' : α -> β) (h : Eq.{max (succ u2) (succ u1)} (α -> β) f' (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f)), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) (NonUnitalRingHom.copy.{u2, u1} α β rα rβ f f' h)) f'
+  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β] (f : NonUnitalRingHom.{u2, u1} α β rα rβ) (f' : α -> β) (h : Eq.{max (succ u2) (succ u1)} (α -> β) f' (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f)), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) (NonUnitalRingHom.copy.{u2, u1} α β rα rβ f f' h)) f'
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.coe_copy NonUnitalRingHom.coe_copyₓ'. -/
 @[simp]
 theorem coe_copy (f : α →ₙ+* β) (f' : α → β) (h : f' = f) : ⇑(f.copy f' h) = f' :=
@@ -240,7 +240,7 @@ theorem coe_copy (f : α →ₙ+* β) (f' : α → β) (h : f' = f) : ⇑(f.copy
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonUnitalNonAssocSemiring.{u1} α} {rβ : NonUnitalNonAssocSemiring.{u2} β} (f : NonUnitalRingHom.{u1, u2} α β rα rβ) (f' : α -> β) (h : Eq.{max (succ u1) (succ u2)} (α -> β) f' (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f)), Eq.{max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (NonUnitalRingHom.copy.{u1, u2} α β rα rβ f f' h) f
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β] (f : NonUnitalRingHom.{u2, u1} α β rα rβ) (f' : α -> β) (h : Eq.{max (succ u2) (succ u1)} (α -> β) f' (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f)), Eq.{max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} α β rα rβ) (NonUnitalRingHom.copy.{u2, u1} α β rα rβ f f' h) f
+  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β] (f : NonUnitalRingHom.{u2, u1} α β rα rβ) (f' : α -> β) (h : Eq.{max (succ u2) (succ u1)} (α -> β) f' (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f)), Eq.{max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} α β rα rβ) (NonUnitalRingHom.copy.{u2, u1} α β rα rβ f f' h) f
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.copy_eq NonUnitalRingHom.copy_eqₓ'. -/
 theorem copy_eq (f : α →ₙ+* β) (f' : α → β) (h : f' = f) : f.copy f' h = f :=
   FunLike.ext' h
@@ -260,7 +260,7 @@ variable (f : α →ₙ+* β) {x y : α} {rα rβ}
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonUnitalNonAssocSemiring.{u1} α} {rβ : NonUnitalNonAssocSemiring.{u2} β} {{f : NonUnitalRingHom.{u1, u2} α β rα rβ}} {{g : NonUnitalRingHom.{u1, u2} α β rα rβ}}, (forall (x : α), Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f x) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) g x)) -> (Eq.{max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) f g)
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β] {{f : NonUnitalRingHom.{u2, u1} α β rα rβ}} {{g : NonUnitalRingHom.{u2, u1} α β rα rβ}}, (forall (x : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) g x)) -> (Eq.{max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} α β rα rβ) f g)
+  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β] {{f : NonUnitalRingHom.{u2, u1} α β rα rβ}} {{g : NonUnitalRingHom.{u2, u1} α β rα rβ}}, (forall (x : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) g x)) -> (Eq.{max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} α β rα rβ) f g)
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.ext NonUnitalRingHom.extₓ'. -/
 @[ext]
 theorem ext ⦃f g : α →ₙ+* β⦄ : (∀ x, f x = g x) → f = g :=
@@ -271,7 +271,7 @@ theorem ext ⦃f g : α →ₙ+* β⦄ : (∀ x, f x = g x) → f = g :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonUnitalNonAssocSemiring.{u1} α} {rβ : NonUnitalNonAssocSemiring.{u2} β} {f : NonUnitalRingHom.{u1, u2} α β rα rβ} {g : NonUnitalRingHom.{u1, u2} α β rα rβ}, Iff (Eq.{max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) f g) (forall (x : α), Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f x) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) g x))
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β] {f : NonUnitalRingHom.{u2, u1} α β rα rβ} {g : NonUnitalRingHom.{u2, u1} α β rα rβ}, Iff (Eq.{max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} α β rα rβ) f g) (forall (x : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) g x))
+  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β] {f : NonUnitalRingHom.{u2, u1} α β rα rβ} {g : NonUnitalRingHom.{u2, u1} α β rα rβ}, Iff (Eq.{max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} α β rα rβ) f g) (forall (x : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) g x))
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.ext_iff NonUnitalRingHom.ext_iffₓ'. -/
 theorem ext_iff {f g : α →ₙ+* β} : f = g ↔ ∀ x, f x = g x :=
   FunLike.ext_iff
@@ -281,7 +281,7 @@ theorem ext_iff {f g : α →ₙ+* β} : f = g ↔ ∀ x, f x = g x :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonUnitalNonAssocSemiring.{u1} α} {rβ : NonUnitalNonAssocSemiring.{u2} β} (f : NonUnitalRingHom.{u1, u2} α β rα rβ) (h₁ : forall (x : α) (y : α), Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f (HMul.hMul.{u1, u1, u1} α α α (instHMul.{u1} α (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα))) x y)) (HMul.hMul.{u2, u2, u2} β β β (instHMul.{u2} β (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f x) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f y))) (h₂ : Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f (OfNat.ofNat.{u1} α 0 (OfNat.mk.{u1} α 0 (Zero.zero.{u1} α (AddZeroClass.toHasZero.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα)))))))) (OfNat.ofNat.{u2} β 0 (OfNat.mk.{u2} β 0 (Zero.zero.{u2} β (AddZeroClass.toHasZero.{u2} β (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))))))) (h₃ : forall (x : α) (y : α), Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f (HAdd.hAdd.{u1, u1, u1} α α α (instHAdd.{u1} α (AddZeroClass.toHasAdd.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))))) x y)) (HAdd.hAdd.{u2, u2, u2} β β β (instHAdd.{u2} β (AddZeroClass.toHasAdd.{u2} β (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))))) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f x) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f y))), Eq.{max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (NonUnitalRingHom.mk.{u1, u2} α β rα rβ (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f) h₁ h₂ h₃) f
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β] (f : NonUnitalRingHom.{u2, u1} α β rα rβ) (h₁ : forall (x : α) (y : α), Eq.{succ u1} β (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f (HMul.hMul.{u2, u2, u2} α α α (instHMul.{u2} α (NonUnitalNonAssocSemiring.toMul.{u2} α rα)) x y)) (HMul.hMul.{u1, u1, u1} β β β (instHMul.{u1} β (NonUnitalNonAssocSemiring.toMul.{u1} β rβ)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f y))) (h₂ : Eq.{succ u1} β (MulHom.toFun.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (MulHom.mk.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f) h₁) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (AddZeroClass.toZero.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))))))) (OfNat.ofNat.{u1} β 0 (Zero.toOfNat0.{u1} β (AddZeroClass.toZero.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ))))))) (h₃ : forall (x : α) (y : α), Eq.{succ u1} β (MulHom.toFun.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (MulHom.mk.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f) h₁) (HAdd.hAdd.{u2, u2, u2} α α α (instHAdd.{u2} α (AddZeroClass.toAdd.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))))) x y)) (HAdd.hAdd.{u1, u1, u1} β β β (instHAdd.{u1} β (AddZeroClass.toAdd.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ))))) (MulHom.toFun.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (MulHom.mk.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f) h₁) x) (MulHom.toFun.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (MulHom.mk.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f) h₁) y))), Eq.{max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} α β rα rβ) (NonUnitalRingHom.mk.{u2, u1} α β rα rβ (MulHom.mk.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f) h₁) h₂ h₃) f
+  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β] (f : NonUnitalRingHom.{u2, u1} α β rα rβ) (h₁ : forall (x : α) (y : α), Eq.{succ u1} β (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f (HMul.hMul.{u2, u2, u2} α α α (instHMul.{u2} α (NonUnitalNonAssocSemiring.toMul.{u2} α rα)) x y)) (HMul.hMul.{u1, u1, u1} β β β (instHMul.{u1} β (NonUnitalNonAssocSemiring.toMul.{u1} β rβ)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f y))) (h₂ : Eq.{succ u1} β (MulHom.toFun.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (MulHom.mk.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f) h₁) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (AddZeroClass.toZero.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))))))) (OfNat.ofNat.{u1} β 0 (Zero.toOfNat0.{u1} β (AddZeroClass.toZero.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ))))))) (h₃ : forall (x : α) (y : α), Eq.{succ u1} β (MulHom.toFun.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (MulHom.mk.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f) h₁) (HAdd.hAdd.{u2, u2, u2} α α α (instHAdd.{u2} α (AddZeroClass.toAdd.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))))) x y)) (HAdd.hAdd.{u1, u1, u1} β β β (instHAdd.{u1} β (AddZeroClass.toAdd.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ))))) (MulHom.toFun.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (MulHom.mk.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f) h₁) x) (MulHom.toFun.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (MulHom.mk.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f) h₁) y))), Eq.{max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} α β rα rβ) (NonUnitalRingHom.mk.{u2, u1} α β rα rβ (MulHom.mk.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f) h₁) h₂ h₃) f
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.mk_coe NonUnitalRingHom.mk_coeₓ'. -/
 @[simp]
 theorem mk_coe (f : α →ₙ+* β) (h₁ h₂ h₃) : NonUnitalRingHom.mk f h₁ h₂ h₃ = f :=
@@ -332,7 +332,7 @@ instance : Inhabited (α →ₙ+* β) :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β], Eq.{succ (max u1 u2)} (α -> β) (coeFn.{max (succ u1) (succ u2), succ (max u1 u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) (OfNat.ofNat.{max u1 u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) 0 (OfNat.mk.{max u1 u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) 0 (Zero.zero.{max u1 u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) (NonUnitalRingHom.hasZero.{u1, u2} α β rα rβ))))) (OfNat.ofNat.{max u1 u2} (α -> β) 0 (OfNat.mk.{max u1 u2} (α -> β) 0 (Zero.zero.{max u1 u2} (α -> β) (Pi.instZero.{u1, u2} α (fun (ᾰ : α) => β) (fun (i : α) => MulZeroClass.toHasZero.{u2} β (NonUnitalNonAssocSemiring.toMulZeroClass.{u2} β rβ))))))
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β], Eq.{max (succ u2) (succ u1)} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) (OfNat.ofNat.{max u2 u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) 0 (Zero.toOfNat0.{max u2 u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) (NonUnitalRingHom.instZeroNonUnitalRingHom.{u2, u1} α β rα rβ)))) (OfNat.ofNat.{max u2 u1} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) ᾰ) 0 (Zero.toOfNat0.{max u2 u1} (forall (a : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (Pi.instZero.{u2, u1} α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (fun (i : α) => MulZeroClass.toZero.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) i) (NonUnitalNonAssocSemiring.toMulZeroClass.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) i) rβ)))))
+  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β], Eq.{max (succ u2) (succ u1)} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) (OfNat.ofNat.{max u2 u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) 0 (Zero.toOfNat0.{max u2 u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) (NonUnitalRingHom.instZeroNonUnitalRingHom.{u2, u1} α β rα rβ)))) (OfNat.ofNat.{max u2 u1} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) ᾰ) 0 (Zero.toOfNat0.{max u2 u1} (forall (a : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (Pi.instZero.{u2, u1} α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (fun (i : α) => MulZeroClass.toZero.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) i) (NonUnitalNonAssocSemiring.toMulZeroClass.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) i) rβ)))))
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.coe_zero NonUnitalRingHom.coe_zeroₓ'. -/
 @[simp]
 theorem coe_zero : ⇑(0 : α →ₙ+* β) = 0 :=
@@ -343,7 +343,7 @@ theorem coe_zero : ⇑(0 : α →ₙ+* β) = 0 :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] (x : α), Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) (OfNat.ofNat.{max u1 u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) 0 (OfNat.mk.{max u1 u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) 0 (Zero.zero.{max u1 u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) (NonUnitalRingHom.hasZero.{u1, u2} α β rα rβ)))) x) (OfNat.ofNat.{u2} β 0 (OfNat.mk.{u2} β 0 (Zero.zero.{u2} β (MulZeroClass.toHasZero.{u2} β (NonUnitalNonAssocSemiring.toMulZeroClass.{u2} β rβ)))))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] (x : α), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} α β rα rβ))) (OfNat.ofNat.{max u1 u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) 0 (Zero.toOfNat0.{max u1 u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) (NonUnitalRingHom.instZeroNonUnitalRingHom.{u1, u2} α β rα rβ))) x) (OfNat.ofNat.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) 0 (Zero.toOfNat0.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) (MulZeroClass.toZero.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) (NonUnitalNonAssocSemiring.toMulZeroClass.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) rβ))))
+  forall {α : Type.{u1}} {β : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] (x : α), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} α β rα rβ))) (OfNat.ofNat.{max u1 u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) 0 (Zero.toOfNat0.{max u1 u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) (NonUnitalRingHom.instZeroNonUnitalRingHom.{u1, u2} α β rα rβ))) x) (OfNat.ofNat.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) 0 (Zero.toOfNat0.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) (MulZeroClass.toZero.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) (NonUnitalNonAssocSemiring.toMulZeroClass.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) rβ))))
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.zero_apply NonUnitalRingHom.zero_applyₓ'. -/
 @[simp]
 theorem zero_apply (x : α) : (0 : α →ₙ+* β) x = 0 :=
@@ -356,7 +356,7 @@ omit rβ
 lean 3 declaration is
   forall {α : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u1} α] (x : α), Eq.{succ u1} α (coeFn.{succ u1, succ u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (fun (_x : NonUnitalRingHom.{u1, u1} α α rα rα) => α -> α) (NonUnitalRingHom.hasCoeToFun.{u1, u1} α α rα rα) (NonUnitalRingHom.id.{u1} α rα) x) x
 but is expected to have type
-  forall {α : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u1} α] (x : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => α) x) (FunLike.coe.{succ u1, succ u1, succ u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => α) _x) (MulHomClass.toFunLike.{u1, u1, u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α α (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalRingHomClass.toMulHomClass.{u1, u1, u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α α rα rα (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u1} α α rα rα))) (NonUnitalRingHom.id.{u1} α rα) x) x
+  forall {α : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u1} α] (x : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => α) x) (FunLike.coe.{succ u1, succ u1, succ u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => α) _x) (MulHomClass.toFunLike.{u1, u1, u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α α (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalRingHomClass.toMulHomClass.{u1, u1, u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α α rα rα (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u1} α α rα rα))) (NonUnitalRingHom.id.{u1} α rα) x) x
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.id_apply NonUnitalRingHom.id_applyₓ'. -/
 @[simp]
 theorem id_apply (x : α) : NonUnitalRingHom.id α x = x :=
@@ -412,7 +412,7 @@ theorem comp_assoc {δ} {rδ : NonUnitalNonAssocSemiring δ} (f : α →ₙ+* β
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {γ : Type.{u3}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] {rγ : NonUnitalNonAssocSemiring.{u3} γ} (g : NonUnitalRingHom.{u2, u3} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u2} α β rα rβ), Eq.{max (succ u1) (succ u3)} (α -> γ) (coeFn.{max (succ u1) (succ u3), max (succ u1) (succ u3)} (NonUnitalRingHom.{u1, u3} α γ rα rγ) (fun (_x : NonUnitalRingHom.{u1, u3} α γ rα rγ) => α -> γ) (NonUnitalRingHom.hasCoeToFun.{u1, u3} α γ rα rγ) (NonUnitalRingHom.comp.{u1, u2, u3} α β γ rα rβ rγ g f)) (Function.comp.{succ u1, succ u2, succ u3} α β γ (coeFn.{max (succ u2) (succ u3), max (succ u2) (succ u3)} (NonUnitalRingHom.{u2, u3} β γ rβ rγ) (fun (_x : NonUnitalRingHom.{u2, u3} β γ rβ rγ) => β -> γ) (NonUnitalRingHom.hasCoeToFun.{u2, u3} β γ rβ rγ) g) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] [rγ : NonUnitalNonAssocSemiring.{u2} γ] (g : NonUnitalRingHom.{u3, u2} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u3} α β rα rβ), Eq.{max (succ u1) (succ u2)} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => γ) ᾰ) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => γ) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α γ rα rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} α γ rα rγ))) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f)) (Function.comp.{succ u1, succ u3, succ u2} α β γ (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : β) => γ) _x) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ))) g) (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ))) f))
+  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] [rγ : NonUnitalNonAssocSemiring.{u2} γ] (g : NonUnitalRingHom.{u3, u2} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u3} α β rα rβ), Eq.{max (succ u1) (succ u2)} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => γ) ᾰ) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => γ) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α γ rα rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} α γ rα rγ))) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f)) (Function.comp.{succ u1, succ u3, succ u2} α β γ (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : β) => γ) _x) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ))) g) (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ))) f))
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.coe_comp NonUnitalRingHom.coe_compₓ'. -/
 @[simp]
 theorem coe_comp (g : β →ₙ+* γ) (f : α →ₙ+* β) : ⇑(g.comp f) = g ∘ f :=
@@ -423,7 +423,7 @@ theorem coe_comp (g : β →ₙ+* γ) (f : α →ₙ+* β) : ⇑(g.comp f) = g 
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {γ : Type.{u3}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] {rγ : NonUnitalNonAssocSemiring.{u3} γ} (g : NonUnitalRingHom.{u2, u3} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u2} α β rα rβ) (x : α), Eq.{succ u3} γ (coeFn.{max (succ u1) (succ u3), max (succ u1) (succ u3)} (NonUnitalRingHom.{u1, u3} α γ rα rγ) (fun (_x : NonUnitalRingHom.{u1, u3} α γ rα rγ) => α -> γ) (NonUnitalRingHom.hasCoeToFun.{u1, u3} α γ rα rγ) (NonUnitalRingHom.comp.{u1, u2, u3} α β γ rα rβ rγ g f) x) (coeFn.{max (succ u2) (succ u3), max (succ u2) (succ u3)} (NonUnitalRingHom.{u2, u3} β γ rβ rγ) (fun (_x : NonUnitalRingHom.{u2, u3} β γ rβ rγ) => β -> γ) (NonUnitalRingHom.hasCoeToFun.{u2, u3} β γ rβ rγ) g (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f x))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] [rγ : NonUnitalNonAssocSemiring.{u2} γ] (g : NonUnitalRingHom.{u3, u2} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u3} α β rα rβ) (x : α), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => γ) x) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => γ) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α γ rα rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} α γ rα rγ))) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f) x) (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : β) => γ) _x) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ))) g (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ))) f x))
+  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] [rγ : NonUnitalNonAssocSemiring.{u2} γ] (g : NonUnitalRingHom.{u3, u2} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u3} α β rα rβ) (x : α), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => γ) x) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => γ) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α γ rα rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} α γ rα rγ))) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f) x) (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : β) => γ) _x) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ))) g (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ))) f x))
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.comp_apply NonUnitalRingHom.comp_applyₓ'. -/
 @[simp]
 theorem comp_apply (g : β →ₙ+* γ) (f : α →ₙ+* β) (x : α) : g.comp f x = g (f x) :=
@@ -434,7 +434,7 @@ theorem comp_apply (g : β →ₙ+* γ) (f : α →ₙ+* β) (x : α) : g.comp f
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {γ : Type.{u3}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] {rγ : NonUnitalNonAssocSemiring.{u3} γ} (g : NonUnitalRingHom.{u2, u3} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u2} α β rα rβ), Eq.{max (succ u3) (succ u1)} (AddMonoidHom.{u1, u3} α γ (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u3} γ (AddCommMonoid.toAddMonoid.{u3} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} γ rγ)))) ((fun (a : Sort.{max (succ u1) (succ u3)}) (b : Sort.{max (succ u3) (succ u1)}) [self : HasLiftT.{max (succ u1) (succ u3), max (succ u3) (succ u1)} a b] => self.0) (NonUnitalRingHom.{u1, u3} α γ rα rγ) (AddMonoidHom.{u1, u3} α γ (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u3} γ (AddCommMonoid.toAddMonoid.{u3} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} γ rγ)))) (HasLiftT.mk.{max (succ u1) (succ u3), max (succ u3) (succ u1)} (NonUnitalRingHom.{u1, u3} α γ rα rγ) (AddMonoidHom.{u1, u3} α γ (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u3} γ (AddCommMonoid.toAddMonoid.{u3} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} γ rγ)))) (CoeTCₓ.coe.{max (succ u1) (succ u3), max (succ u3) (succ u1)} (NonUnitalRingHom.{u1, u3} α γ rα rγ) (AddMonoidHom.{u1, u3} α γ (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u3} γ (AddCommMonoid.toAddMonoid.{u3} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} γ rγ)))) (AddMonoidHom.hasCoeT.{u1, u3, max u1 u3} α γ (NonUnitalRingHom.{u1, u3} α γ rα rγ) (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u3} γ (AddCommMonoid.toAddMonoid.{u3} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} γ rγ))) (NonUnitalRingHomClass.toAddMonoidHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α γ rα rγ) α γ rα rγ (NonUnitalRingHom.nonUnitalRingHomClass.{u1, u3} α γ rα rγ))))) (NonUnitalRingHom.comp.{u1, u2, u3} α β γ rα rβ rγ g f)) (AddMonoidHom.comp.{u1, u2, u3} α β γ (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))) (AddMonoid.toAddZeroClass.{u3} γ (AddCommMonoid.toAddMonoid.{u3} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} γ rγ))) ((fun (a : Sort.{max (succ u2) (succ u3)}) (b : Sort.{max (succ u3) (succ u2)}) [self : HasLiftT.{max (succ u2) (succ u3), max (succ u3) (succ u2)} a b] => self.0) (NonUnitalRingHom.{u2, u3} β γ rβ rγ) (AddMonoidHom.{u2, u3} β γ (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))) (AddMonoid.toAddZeroClass.{u3} γ (AddCommMonoid.toAddMonoid.{u3} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} γ rγ)))) (HasLiftT.mk.{max (succ u2) (succ u3), max (succ u3) (succ u2)} (NonUnitalRingHom.{u2, u3} β γ rβ rγ) (AddMonoidHom.{u2, u3} β γ (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))) (AddMonoid.toAddZeroClass.{u3} γ (AddCommMonoid.toAddMonoid.{u3} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} γ rγ)))) (CoeTCₓ.coe.{max (succ u2) (succ u3), max (succ u3) (succ u2)} (NonUnitalRingHom.{u2, u3} β γ rβ rγ) (AddMonoidHom.{u2, u3} β γ (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))) (AddMonoid.toAddZeroClass.{u3} γ (AddCommMonoid.toAddMonoid.{u3} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} γ rγ)))) (AddMonoidHom.hasCoeT.{u2, u3, max u2 u3} β γ (NonUnitalRingHom.{u2, u3} β γ rβ rγ) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))) (AddMonoid.toAddZeroClass.{u3} γ (AddCommMonoid.toAddMonoid.{u3} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} γ rγ))) (NonUnitalRingHomClass.toAddMonoidHomClass.{max u2 u3, u2, u3} (NonUnitalRingHom.{u2, u3} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.nonUnitalRingHomClass.{u2, u3} β γ rβ rγ))))) g) ((fun (a : Sort.{max (succ u1) (succ u2)}) (b : Sort.{max (succ u2) (succ u1)}) [self : HasLiftT.{max (succ u1) (succ u2), max (succ u2) (succ u1)} a b] => self.0) (NonUnitalRingHom.{u1, u2} α β rα rβ) (AddMonoidHom.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) (HasLiftT.mk.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (AddMonoidHom.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) (CoeTCₓ.coe.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (AddMonoidHom.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) (AddMonoidHom.hasCoeT.{u1, u2, max u1 u2} α β (NonUnitalRingHom.{u1, u2} α β rα rβ) (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))) (NonUnitalRingHomClass.toAddMonoidHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β rα rβ (NonUnitalRingHom.nonUnitalRingHomClass.{u1, u2} α β rα rβ))))) f))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] [rγ : NonUnitalNonAssocSemiring.{u2} γ] (g : NonUnitalRingHom.{u3, u2} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u3} α β rα rβ), Eq.{max (succ u1) (succ u2)} (AddMonoidHom.{u1, u2} α γ (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} γ (AddCommMonoid.toAddMonoid.{u2} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} γ rγ)))) (AddMonoidHom.mk.{u1, u2} α γ (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} γ (AddCommMonoid.toAddMonoid.{u2} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} γ rγ))) (ZeroHom.mk.{u1, u2} α γ (AddZeroClass.toZero.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα)))) (AddZeroClass.toZero.{u2} γ (AddMonoid.toAddZeroClass.{u2} γ (AddCommMonoid.toAddMonoid.{u2} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} γ rγ)))) (Function.comp.{succ u1, succ u3, succ u2} α β γ (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β (fun (a : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : β) => γ) a) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ))) g) (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ))) f)) (NonUnitalRingHom.map_zero'.{u1, u2} α γ rα rγ (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f))) (NonUnitalRingHom.map_add'.{u1, u2} α γ rα rγ (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f))) (AddMonoidHom.comp.{u1, u3, u2} α β γ (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u3} β (AddCommMonoid.toAddMonoid.{u3} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} β rβ))) (AddMonoid.toAddZeroClass.{u2} γ (AddCommMonoid.toAddMonoid.{u2} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} γ rγ))) (AddMonoidHomClass.toAddMonoidHom.{u3, u2, max u3 u2} β γ (NonUnitalRingHom.{u3, u2} β γ rβ rγ) (AddMonoid.toAddZeroClass.{u3} β (AddCommMonoid.toAddMonoid.{u3} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} β rβ))) (AddMonoid.toAddZeroClass.{u2} γ (AddCommMonoid.toAddMonoid.{u2} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} γ rγ))) (NonUnitalRingHomClass.toAddMonoidHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ)) g) (AddMonoidHomClass.toAddMonoidHom.{u1, u3, max u1 u3} α β (NonUnitalRingHom.{u1, u3} α β rα rβ) (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u3} β (AddCommMonoid.toAddMonoid.{u3} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} β rβ))) (NonUnitalRingHomClass.toAddMonoidHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ)) f))
+  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] [rγ : NonUnitalNonAssocSemiring.{u2} γ] (g : NonUnitalRingHom.{u3, u2} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u3} α β rα rβ), Eq.{max (succ u1) (succ u2)} (AddMonoidHom.{u1, u2} α γ (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} γ (AddCommMonoid.toAddMonoid.{u2} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} γ rγ)))) (AddMonoidHom.mk.{u1, u2} α γ (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} γ (AddCommMonoid.toAddMonoid.{u2} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} γ rγ))) (ZeroHom.mk.{u1, u2} α γ (AddZeroClass.toZero.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα)))) (AddZeroClass.toZero.{u2} γ (AddMonoid.toAddZeroClass.{u2} γ (AddCommMonoid.toAddMonoid.{u2} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} γ rγ)))) (Function.comp.{succ u1, succ u3, succ u2} α β γ (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β (fun (a : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : β) => γ) a) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ))) g) (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ))) f)) (NonUnitalRingHom.map_zero'.{u1, u2} α γ rα rγ (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f))) (NonUnitalRingHom.map_add'.{u1, u2} α γ rα rγ (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f))) (AddMonoidHom.comp.{u1, u3, u2} α β γ (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u3} β (AddCommMonoid.toAddMonoid.{u3} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} β rβ))) (AddMonoid.toAddZeroClass.{u2} γ (AddCommMonoid.toAddMonoid.{u2} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} γ rγ))) (AddMonoidHomClass.toAddMonoidHom.{u3, u2, max u3 u2} β γ (NonUnitalRingHom.{u3, u2} β γ rβ rγ) (AddMonoid.toAddZeroClass.{u3} β (AddCommMonoid.toAddMonoid.{u3} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} β rβ))) (AddMonoid.toAddZeroClass.{u2} γ (AddCommMonoid.toAddMonoid.{u2} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} γ rγ))) (NonUnitalRingHomClass.toAddMonoidHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ)) g) (AddMonoidHomClass.toAddMonoidHom.{u1, u3, max u1 u3} α β (NonUnitalRingHom.{u1, u3} α β rα rβ) (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u3} β (AddCommMonoid.toAddMonoid.{u3} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} β rβ))) (NonUnitalRingHomClass.toAddMonoidHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ)) f))
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.coe_comp_add_monoid_hom NonUnitalRingHom.coe_comp_addMonoidHomₓ'. -/
 @[simp]
 theorem coe_comp_addMonoidHom (g : β →ₙ+* γ) (f : α →ₙ+* β) :
@@ -446,7 +446,7 @@ theorem coe_comp_addMonoidHom (g : β →ₙ+* γ) (f : α →ₙ+* β) :
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {γ : Type.{u3}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] {rγ : NonUnitalNonAssocSemiring.{u3} γ} (g : NonUnitalRingHom.{u2, u3} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u2} α β rα rβ), Eq.{max (succ u3) (succ u1)} (MulHom.{u1, u3} α γ (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u3} γ (NonUnitalNonAssocSemiring.toDistrib.{u3} γ rγ))) ((fun (a : Sort.{max (succ u1) (succ u3)}) (b : Sort.{max (succ u3) (succ u1)}) [self : HasLiftT.{max (succ u1) (succ u3), max (succ u3) (succ u1)} a b] => self.0) (NonUnitalRingHom.{u1, u3} α γ rα rγ) (MulHom.{u1, u3} α γ (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u3} γ (NonUnitalNonAssocSemiring.toDistrib.{u3} γ rγ))) (HasLiftT.mk.{max (succ u1) (succ u3), max (succ u3) (succ u1)} (NonUnitalRingHom.{u1, u3} α γ rα rγ) (MulHom.{u1, u3} α γ (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u3} γ (NonUnitalNonAssocSemiring.toDistrib.{u3} γ rγ))) (CoeTCₓ.coe.{max (succ u1) (succ u3), max (succ u3) (succ u1)} (NonUnitalRingHom.{u1, u3} α γ rα rγ) (MulHom.{u1, u3} α γ (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u3} γ (NonUnitalNonAssocSemiring.toDistrib.{u3} γ rγ))) (MulHom.hasCoeT.{u1, u3, max u1 u3} α γ (NonUnitalRingHom.{u1, u3} α γ rα rγ) (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u3} γ (NonUnitalNonAssocSemiring.toDistrib.{u3} γ rγ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α γ rα rγ) α γ rα rγ (NonUnitalRingHom.nonUnitalRingHomClass.{u1, u3} α γ rα rγ))))) (NonUnitalRingHom.comp.{u1, u2, u3} α β γ rα rβ rγ g f)) (MulHom.comp.{u1, u2, u3} α β γ (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ)) (Distrib.toHasMul.{u3} γ (NonUnitalNonAssocSemiring.toDistrib.{u3} γ rγ)) ((fun (a : Sort.{max (succ u2) (succ u3)}) (b : Sort.{max (succ u3) (succ u2)}) [self : HasLiftT.{max (succ u2) (succ u3), max (succ u3) (succ u2)} a b] => self.0) (NonUnitalRingHom.{u2, u3} β γ rβ rγ) (MulHom.{u2, u3} β γ (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ)) (Distrib.toHasMul.{u3} γ (NonUnitalNonAssocSemiring.toDistrib.{u3} γ rγ))) (HasLiftT.mk.{max (succ u2) (succ u3), max (succ u3) (succ u2)} (NonUnitalRingHom.{u2, u3} β γ rβ rγ) (MulHom.{u2, u3} β γ (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ)) (Distrib.toHasMul.{u3} γ (NonUnitalNonAssocSemiring.toDistrib.{u3} γ rγ))) (CoeTCₓ.coe.{max (succ u2) (succ u3), max (succ u3) (succ u2)} (NonUnitalRingHom.{u2, u3} β γ rβ rγ) (MulHom.{u2, u3} β γ (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ)) (Distrib.toHasMul.{u3} γ (NonUnitalNonAssocSemiring.toDistrib.{u3} γ rγ))) (MulHom.hasCoeT.{u2, u3, max u2 u3} β γ (NonUnitalRingHom.{u2, u3} β γ rβ rγ) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ)) (Distrib.toHasMul.{u3} γ (NonUnitalNonAssocSemiring.toDistrib.{u3} γ rγ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u3, u2, u3} (NonUnitalRingHom.{u2, u3} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.nonUnitalRingHomClass.{u2, u3} β γ rβ rγ))))) g) ((fun (a : Sort.{max (succ u1) (succ u2)}) (b : Sort.{max (succ u2) (succ u1)}) [self : HasLiftT.{max (succ u1) (succ u2), max (succ u2) (succ u1)} a b] => self.0) (NonUnitalRingHom.{u1, u2} α β rα rβ) (MulHom.{u1, u2} α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) (HasLiftT.mk.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (MulHom.{u1, u2} α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) (CoeTCₓ.coe.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (MulHom.{u1, u2} α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) (MulHom.hasCoeT.{u1, u2, max u1 u2} α β (NonUnitalRingHom.{u1, u2} α β rα rβ) (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β rα rβ (NonUnitalRingHom.nonUnitalRingHomClass.{u1, u2} α β rα rβ))))) f))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] [rγ : NonUnitalNonAssocSemiring.{u2} γ] (g : NonUnitalRingHom.{u3, u2} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u3} α β rα rβ), Eq.{max (succ u1) (succ u2)} (MulHom.{u1, u2} α γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ)) (MulHom.mk.{u1, u2} α γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (Function.comp.{succ u1, succ u3, succ u2} α β γ (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β (fun (a : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : β) => γ) a) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ))) g) (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ))) f)) (MulHom.map_mul'.{u1, u2} α γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHom.toMulHom.{u1, u2} α γ rα rγ (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f)))) (MulHom.comp.{u1, u3, u2} α β γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (MulHomClass.toMulHom.{u3, u2, max u3 u2} β γ (NonUnitalRingHom.{u3, u2} β γ rβ rγ) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ)) g) (MulHomClass.toMulHom.{u1, u3, max u1 u3} α β (NonUnitalRingHom.{u1, u3} α β rα rβ) (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ)) f))
+  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] [rγ : NonUnitalNonAssocSemiring.{u2} γ] (g : NonUnitalRingHom.{u3, u2} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u3} α β rα rβ), Eq.{max (succ u1) (succ u2)} (MulHom.{u1, u2} α γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ)) (MulHom.mk.{u1, u2} α γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (Function.comp.{succ u1, succ u3, succ u2} α β γ (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β (fun (a : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : β) => γ) a) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ))) g) (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ))) f)) (MulHom.map_mul'.{u1, u2} α γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHom.toMulHom.{u1, u2} α γ rα rγ (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f)))) (MulHom.comp.{u1, u3, u2} α β γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (MulHomClass.toMulHom.{u3, u2, max u3 u2} β γ (NonUnitalRingHom.{u3, u2} β γ rβ rγ) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ)) g) (MulHomClass.toMulHom.{u1, u3, max u1 u3} α β (NonUnitalRingHom.{u1, u3} α β rα rβ) (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ)) f))
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.coe_comp_mul_hom NonUnitalRingHom.coe_comp_mulHomₓ'. -/
 @[simp]
 theorem coe_comp_mulHom (g : β →ₙ+* γ) (f : α →ₙ+* β) :
@@ -531,7 +531,7 @@ theorem one_def : (1 : α →ₙ+* α) = NonUnitalRingHom.id α :=
 lean 3 declaration is
   forall {α : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u1} α], Eq.{succ u1} (α -> α) (coeFn.{succ u1, succ u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (fun (_x : NonUnitalRingHom.{u1, u1} α α rα rα) => α -> α) (NonUnitalRingHom.hasCoeToFun.{u1, u1} α α rα rα) (OfNat.ofNat.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) 1 (OfNat.mk.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) 1 (One.one.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (MulOneClass.toHasOne.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (MulZeroOneClass.toMulOneClass.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (MonoidWithZero.toMulZeroOneClass.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (NonUnitalRingHom.monoidWithZero.{u1} α rα)))))))) (id.{succ u1} α)
 but is expected to have type
-  forall {α : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u1} α], Eq.{succ u1} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => α) ᾰ) (FunLike.coe.{succ u1, succ u1, succ u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => α) _x) (MulHomClass.toFunLike.{u1, u1, u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α α (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalRingHomClass.toMulHomClass.{u1, u1, u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α α rα rα (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u1} α α rα rα))) (OfNat.ofNat.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) 1 (One.toOfNat1.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (Monoid.toOne.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (MonoidWithZero.toMonoid.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (NonUnitalRingHom.instMonoidWithZeroNonUnitalRingHom.{u1} α rα)))))) (id.{succ u1} α)
+  forall {α : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u1} α], Eq.{succ u1} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => α) ᾰ) (FunLike.coe.{succ u1, succ u1, succ u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => α) _x) (MulHomClass.toFunLike.{u1, u1, u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α α (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalRingHomClass.toMulHomClass.{u1, u1, u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α α rα rα (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u1} α α rα rα))) (OfNat.ofNat.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) 1 (One.toOfNat1.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (Monoid.toOne.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (MonoidWithZero.toMonoid.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (NonUnitalRingHom.instMonoidWithZeroNonUnitalRingHom.{u1} α rα)))))) (id.{succ u1} α)
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.coe_one NonUnitalRingHom.coe_oneₓ'. -/
 @[simp]
 theorem coe_one : ⇑(1 : α →ₙ+* α) = id :=
@@ -552,7 +552,7 @@ theorem mul_def (f g : α →ₙ+* α) : f * g = f.comp g :=
 lean 3 declaration is
   forall {α : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u1} α] (f : NonUnitalRingHom.{u1, u1} α α rα rα) (g : NonUnitalRingHom.{u1, u1} α α rα rα), Eq.{succ u1} (α -> α) (coeFn.{succ u1, succ u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (fun (_x : NonUnitalRingHom.{u1, u1} α α rα rα) => α -> α) (NonUnitalRingHom.hasCoeToFun.{u1, u1} α α rα rα) (HMul.hMul.{u1, u1, u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (NonUnitalRingHom.{u1, u1} α α rα rα) (NonUnitalRingHom.{u1, u1} α α rα rα) (instHMul.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (MulZeroClass.toHasMul.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (MulZeroOneClass.toMulZeroClass.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (MonoidWithZero.toMulZeroOneClass.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (NonUnitalRingHom.monoidWithZero.{u1} α rα))))) f g)) (Function.comp.{succ u1, succ u1, succ u1} α α α (coeFn.{succ u1, succ u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (fun (_x : NonUnitalRingHom.{u1, u1} α α rα rα) => α -> α) (NonUnitalRingHom.hasCoeToFun.{u1, u1} α α rα rα) f) (coeFn.{succ u1, succ u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (fun (_x : NonUnitalRingHom.{u1, u1} α α rα rα) => α -> α) (NonUnitalRingHom.hasCoeToFun.{u1, u1} α α rα rα) g))
 but is expected to have type
-  forall {α : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u1} α] (f : NonUnitalRingHom.{u1, u1} α α rα rα) (g : NonUnitalRingHom.{u1, u1} α α rα rα), Eq.{succ u1} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => α) ᾰ) (FunLike.coe.{succ u1, succ u1, succ u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => α) _x) (MulHomClass.toFunLike.{u1, u1, u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α α (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalRingHomClass.toMulHomClass.{u1, u1, u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α α rα rα (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u1} α α rα rα))) (HMul.hMul.{u1, u1, u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (NonUnitalRingHom.{u1, u1} α α rα rα) (NonUnitalRingHom.{u1, u1} α α rα rα) (instHMul.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (MulZeroClass.toMul.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (MulZeroOneClass.toMulZeroClass.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (MonoidWithZero.toMulZeroOneClass.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (NonUnitalRingHom.instMonoidWithZeroNonUnitalRingHom.{u1} α rα))))) f g)) (Function.comp.{succ u1, succ u1, succ u1} α α α (FunLike.coe.{succ u1, succ u1, succ u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => α) _x) (MulHomClass.toFunLike.{u1, u1, u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α α (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalRingHomClass.toMulHomClass.{u1, u1, u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α α rα rα (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u1} α α rα rα))) f) (FunLike.coe.{succ u1, succ u1, succ u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => α) _x) (MulHomClass.toFunLike.{u1, u1, u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α α (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalRingHomClass.toMulHomClass.{u1, u1, u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α α rα rα (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u1} α α rα rα))) g))
+  forall {α : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u1} α] (f : NonUnitalRingHom.{u1, u1} α α rα rα) (g : NonUnitalRingHom.{u1, u1} α α rα rα), Eq.{succ u1} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => α) ᾰ) (FunLike.coe.{succ u1, succ u1, succ u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => α) _x) (MulHomClass.toFunLike.{u1, u1, u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α α (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalRingHomClass.toMulHomClass.{u1, u1, u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α α rα rα (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u1} α α rα rα))) (HMul.hMul.{u1, u1, u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (NonUnitalRingHom.{u1, u1} α α rα rα) (NonUnitalRingHom.{u1, u1} α α rα rα) (instHMul.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (MulZeroClass.toMul.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (MulZeroOneClass.toMulZeroClass.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (MonoidWithZero.toMulZeroOneClass.{u1} (NonUnitalRingHom.{u1, u1} α α rα rα) (NonUnitalRingHom.instMonoidWithZeroNonUnitalRingHom.{u1} α rα))))) f g)) (Function.comp.{succ u1, succ u1, succ u1} α α α (FunLike.coe.{succ u1, succ u1, succ u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => α) _x) (MulHomClass.toFunLike.{u1, u1, u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α α (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalRingHomClass.toMulHomClass.{u1, u1, u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α α rα rα (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u1} α α rα rα))) f) (FunLike.coe.{succ u1, succ u1, succ u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => α) _x) (MulHomClass.toFunLike.{u1, u1, u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α α (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalRingHomClass.toMulHomClass.{u1, u1, u1} (NonUnitalRingHom.{u1, u1} α α rα rα) α α rα rα (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u1} α α rα rα))) g))
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.coe_mul NonUnitalRingHom.coe_mulₓ'. -/
 @[simp]
 theorem coe_mul (f g : α →ₙ+* α) : ⇑(f * g) = f ∘ g :=
@@ -565,7 +565,7 @@ include rβ rγ
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {γ : Type.{u3}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] {rγ : NonUnitalNonAssocSemiring.{u3} γ} {g₁ : NonUnitalRingHom.{u2, u3} β γ rβ rγ} {g₂ : NonUnitalRingHom.{u2, u3} β γ rβ rγ} {f : NonUnitalRingHom.{u1, u2} α β rα rβ}, (Function.Surjective.{succ u1, succ u2} α β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f)) -> (Iff (Eq.{max (succ u1) (succ u3)} (NonUnitalRingHom.{u1, u3} α γ rα rγ) (NonUnitalRingHom.comp.{u1, u2, u3} α β γ rα rβ rγ g₁ f) (NonUnitalRingHom.comp.{u1, u2, u3} α β γ rα rβ rγ g₂ f)) (Eq.{max (succ u2) (succ u3)} (NonUnitalRingHom.{u2, u3} β γ rβ rγ) g₁ g₂))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] [rγ : NonUnitalNonAssocSemiring.{u2} γ] {g₁ : NonUnitalRingHom.{u3, u2} β γ rβ rγ} {g₂ : NonUnitalRingHom.{u3, u2} β γ rβ rγ} {f : NonUnitalRingHom.{u1, u3} α β rα rβ}, (Function.Surjective.{succ u1, succ u3} α β (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ))) f)) -> (Iff (Eq.{max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α γ rα rγ) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g₁ f) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g₂ f)) (Eq.{max (succ u3) (succ u2)} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) g₁ g₂))
+  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] [rγ : NonUnitalNonAssocSemiring.{u2} γ] {g₁ : NonUnitalRingHom.{u3, u2} β γ rβ rγ} {g₂ : NonUnitalRingHom.{u3, u2} β γ rβ rγ} {f : NonUnitalRingHom.{u1, u3} α β rα rβ}, (Function.Surjective.{succ u1, succ u3} α β (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ))) f)) -> (Iff (Eq.{max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α γ rα rγ) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g₁ f) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g₂ f)) (Eq.{max (succ u3) (succ u2)} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) g₁ g₂))
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.cancel_right NonUnitalRingHom.cancel_rightₓ'. -/
 theorem cancel_right {g₁ g₂ : β →ₙ+* γ} {f : α →ₙ+* β} (hf : Surjective f) :
     g₁.comp f = g₂.comp f ↔ g₁ = g₂ :=
@@ -576,7 +576,7 @@ theorem cancel_right {g₁ g₂ : β →ₙ+* γ} {f : α →ₙ+* β} (hf : Sur
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {γ : Type.{u3}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] {rγ : NonUnitalNonAssocSemiring.{u3} γ} {g : NonUnitalRingHom.{u2, u3} β γ rβ rγ} {f₁ : NonUnitalRingHom.{u1, u2} α β rα rβ} {f₂ : NonUnitalRingHom.{u1, u2} α β rα rβ}, (Function.Injective.{succ u2, succ u3} β γ (coeFn.{max (succ u2) (succ u3), max (succ u2) (succ u3)} (NonUnitalRingHom.{u2, u3} β γ rβ rγ) (fun (_x : NonUnitalRingHom.{u2, u3} β γ rβ rγ) => β -> γ) (NonUnitalRingHom.hasCoeToFun.{u2, u3} β γ rβ rγ) g)) -> (Iff (Eq.{max (succ u1) (succ u3)} (NonUnitalRingHom.{u1, u3} α γ rα rγ) (NonUnitalRingHom.comp.{u1, u2, u3} α β γ rα rβ rγ g f₁) (NonUnitalRingHom.comp.{u1, u2, u3} α β γ rα rβ rγ g f₂)) (Eq.{max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) f₁ f₂))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] [rγ : NonUnitalNonAssocSemiring.{u2} γ] {g : NonUnitalRingHom.{u3, u2} β γ rβ rγ} {f₁ : NonUnitalRingHom.{u1, u3} α β rα rβ} {f₂ : NonUnitalRingHom.{u1, u3} α β rα rβ}, (Function.Injective.{succ u3, succ u2} β γ (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : β) => γ) _x) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ))) g)) -> (Iff (Eq.{max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α γ rα rγ) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f₁) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f₂)) (Eq.{max (succ u1) (succ u3)} (NonUnitalRingHom.{u1, u3} α β rα rβ) f₁ f₂))
+  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] [rγ : NonUnitalNonAssocSemiring.{u2} γ] {g : NonUnitalRingHom.{u3, u2} β γ rβ rγ} {f₁ : NonUnitalRingHom.{u1, u3} α β rα rβ} {f₂ : NonUnitalRingHom.{u1, u3} α β rα rβ}, (Function.Injective.{succ u3, succ u2} β γ (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : β) => γ) _x) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ))) g)) -> (Iff (Eq.{max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α γ rα rγ) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f₁) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f₂)) (Eq.{max (succ u1) (succ u3)} (NonUnitalRingHom.{u1, u3} α β rα rβ) f₁ f₂))
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.cancel_left NonUnitalRingHom.cancel_leftₓ'. -/
 theorem cancel_left {g : β →ₙ+* γ} {f₁ f₂ : α →ₙ+* β} (hg : Injective g) :
     g.comp f₁ = g.comp f₂ ↔ f₁ = f₂ :=
@@ -637,7 +637,7 @@ variable [NonAssocSemiring α] [NonAssocSemiring β] [RingHomClass F α β]
 lean 3 declaration is
   forall {F : Type.{u1}} {α : Type.{u2}} {β : Type.{u3}} [_inst_1 : NonAssocSemiring.{u2} α] [_inst_2 : NonAssocSemiring.{u3} β] [_inst_3 : RingHomClass.{u1, u2, u3} F α β _inst_1 _inst_2] (f : F) (a : α), Eq.{succ u3} β (coeFn.{succ u1, max (succ u2) (succ u3)} F (fun (_x : F) => α -> β) (FunLike.hasCoeToFun.{succ u1, succ u2, succ u3} F α (fun (_x : α) => β) (MulHomClass.toFunLike.{u1, u2, u3} F α β (MulOneClass.toHasMul.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α _inst_1))) (MulOneClass.toHasMul.{u3} β (MulZeroOneClass.toMulOneClass.{u3} β (NonAssocSemiring.toMulZeroOneClass.{u3} β _inst_2))) (MonoidHomClass.toMulHomClass.{u1, u2, u3} F α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u3} β (NonAssocSemiring.toMulZeroOneClass.{u3} β _inst_2)) (RingHomClass.toMonoidHomClass.{u1, u2, u3} F α β _inst_1 _inst_2 _inst_3)))) f (bit1.{u2} α (AddMonoidWithOne.toOne.{u2} α (AddCommMonoidWithOne.toAddMonoidWithOne.{u2} α (NonAssocSemiring.toAddCommMonoidWithOne.{u2} α _inst_1))) (Distrib.toHasAdd.{u2} α (NonUnitalNonAssocSemiring.toDistrib.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α _inst_1))) a)) (bit1.{u3} β (AddMonoidWithOne.toOne.{u3} β (AddCommMonoidWithOne.toAddMonoidWithOne.{u3} β (NonAssocSemiring.toAddCommMonoidWithOne.{u3} β _inst_2))) (Distrib.toHasAdd.{u3} β (NonUnitalNonAssocSemiring.toDistrib.{u3} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β _inst_2))) (coeFn.{succ u1, max (succ u2) (succ u3)} F (fun (_x : F) => α -> β) (FunLike.hasCoeToFun.{succ u1, succ u2, succ u3} F α (fun (_x : α) => β) (MulHomClass.toFunLike.{u1, u2, u3} F α β (MulOneClass.toHasMul.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α _inst_1))) (MulOneClass.toHasMul.{u3} β (MulZeroOneClass.toMulOneClass.{u3} β (NonAssocSemiring.toMulZeroOneClass.{u3} β _inst_2))) (MonoidHomClass.toMulHomClass.{u1, u2, u3} F α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u3} β (NonAssocSemiring.toMulZeroOneClass.{u3} β _inst_2)) (RingHomClass.toMonoidHomClass.{u1, u2, u3} F α β _inst_1 _inst_2 _inst_3)))) f a))
 but is expected to have type
-  forall {F : Type.{u1}} {α : Type.{u3}} {β : Type.{u2}} [_inst_1 : NonAssocSemiring.{u3} α] [_inst_2 : NonAssocSemiring.{u2} β] [_inst_3 : RingHomClass.{u1, u3, u2} F α β _inst_1 _inst_2] (f : F) (a : α), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (bit1.{u3} α (NonAssocSemiring.toOne.{u3} α _inst_1) (Distrib.toAdd.{u3} α (NonUnitalNonAssocSemiring.toDistrib.{u3} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} α _inst_1))) a)) (FunLike.coe.{succ u1, succ u3, succ u2} F α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{u1, u3, u2} F α β (MulOneClass.toMul.{u3} α (MulZeroOneClass.toMulOneClass.{u3} α (NonAssocSemiring.toMulZeroOneClass.{u3} α _inst_1))) (MulOneClass.toMul.{u2} β (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β _inst_2))) (MonoidHomClass.toMulHomClass.{u1, u3, u2} F α β (MulZeroOneClass.toMulOneClass.{u3} α (NonAssocSemiring.toMulZeroOneClass.{u3} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β _inst_2)) (RingHomClass.toMonoidHomClass.{u1, u3, u2} F α β _inst_1 _inst_2 _inst_3))) f (bit1.{u3} α (NonAssocSemiring.toOne.{u3} α _inst_1) (Distrib.toAdd.{u3} α (NonUnitalNonAssocSemiring.toDistrib.{u3} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} α _inst_1))) a)) (bit1.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (NonAssocSemiring.toOne.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) _inst_2) (Distrib.toAdd.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (NonUnitalNonAssocSemiring.toDistrib.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) _inst_2))) (FunLike.coe.{succ u1, succ u3, succ u2} F α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{u1, u3, u2} F α β (MulOneClass.toMul.{u3} α (MulZeroOneClass.toMulOneClass.{u3} α (NonAssocSemiring.toMulZeroOneClass.{u3} α _inst_1))) (MulOneClass.toMul.{u2} β (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β _inst_2))) (MonoidHomClass.toMulHomClass.{u1, u3, u2} F α β (MulZeroOneClass.toMulOneClass.{u3} α (NonAssocSemiring.toMulZeroOneClass.{u3} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β _inst_2)) (RingHomClass.toMonoidHomClass.{u1, u3, u2} F α β _inst_1 _inst_2 _inst_3))) f a))
+  forall {F : Type.{u1}} {α : Type.{u3}} {β : Type.{u2}} [_inst_1 : NonAssocSemiring.{u3} α] [_inst_2 : NonAssocSemiring.{u2} β] [_inst_3 : RingHomClass.{u1, u3, u2} F α β _inst_1 _inst_2] (f : F) (a : α), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (bit1.{u3} α (NonAssocSemiring.toOne.{u3} α _inst_1) (Distrib.toAdd.{u3} α (NonUnitalNonAssocSemiring.toDistrib.{u3} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} α _inst_1))) a)) (FunLike.coe.{succ u1, succ u3, succ u2} F α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{u1, u3, u2} F α β (MulOneClass.toMul.{u3} α (MulZeroOneClass.toMulOneClass.{u3} α (NonAssocSemiring.toMulZeroOneClass.{u3} α _inst_1))) (MulOneClass.toMul.{u2} β (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β _inst_2))) (MonoidHomClass.toMulHomClass.{u1, u3, u2} F α β (MulZeroOneClass.toMulOneClass.{u3} α (NonAssocSemiring.toMulZeroOneClass.{u3} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β _inst_2)) (RingHomClass.toMonoidHomClass.{u1, u3, u2} F α β _inst_1 _inst_2 _inst_3))) f (bit1.{u3} α (NonAssocSemiring.toOne.{u3} α _inst_1) (Distrib.toAdd.{u3} α (NonUnitalNonAssocSemiring.toDistrib.{u3} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} α _inst_1))) a)) (bit1.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (NonAssocSemiring.toOne.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) _inst_2) (Distrib.toAdd.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (NonUnitalNonAssocSemiring.toDistrib.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) _inst_2))) (FunLike.coe.{succ u1, succ u3, succ u2} F α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{u1, u3, u2} F α β (MulOneClass.toMul.{u3} α (MulZeroOneClass.toMulOneClass.{u3} α (NonAssocSemiring.toMulZeroOneClass.{u3} α _inst_1))) (MulOneClass.toMul.{u2} β (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β _inst_2))) (MonoidHomClass.toMulHomClass.{u1, u3, u2} F α β (MulZeroOneClass.toMulOneClass.{u3} α (NonAssocSemiring.toMulZeroOneClass.{u3} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β _inst_2)) (RingHomClass.toMonoidHomClass.{u1, u3, u2} F α β _inst_1 _inst_2 _inst_3))) f a))
 Case conversion may be inaccurate. Consider using '#align map_bit1 map_bit1ₓ'. -/
 /-- Ring homomorphisms preserve `bit1`. -/
 @[simp]
@@ -695,7 +695,7 @@ initialize_simps_projections RingHom (toFun → apply)
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ), Eq.{max (succ u1) (succ u2)} (α -> β) (RingHom.toFun.{u1, u2} α β rα rβ f) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f)
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} (f : RingHom.{u2, u1} α β rα rβ), Eq.{max (succ u2) (succ u1)} (α -> β) (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (MonoidHom.toOneHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) (RingHom.toMonoidHom.{u2, u1} α β rα rβ f))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f)
+  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} (f : RingHom.{u2, u1} α β rα rβ), Eq.{max (succ u2) (succ u1)} (α -> β) (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (MonoidHom.toOneHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) (RingHom.toMonoidHom.{u2, u1} α β rα rβ f))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f)
 Case conversion may be inaccurate. Consider using '#align ring_hom.to_fun_eq_coe RingHom.toFun_eq_coeₓ'. -/
 @[simp]
 theorem toFun_eq_coe (f : α →+* β) : f.toFun = f :=
@@ -706,7 +706,7 @@ theorem toFun_eq_coe (f : α →+* β) : f.toFun = f :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : α -> β) (h₁ : Eq.{succ u2} β (f (OfNat.ofNat.{u1} α 1 (OfNat.mk.{u1} α 1 (One.one.{u1} α (MulOneClass.toHasOne.{u1} α (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α rα))))))) (OfNat.ofNat.{u2} β 1 (OfNat.mk.{u2} β 1 (One.one.{u2} β (MulOneClass.toHasOne.{u2} β (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β rβ))))))) (h₂ : forall (x : α) (y : α), Eq.{succ u2} β (f (HMul.hMul.{u1, u1, u1} α α α (instHMul.{u1} α (MulOneClass.toHasMul.{u1} α (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α rα)))) x y)) (HMul.hMul.{u2, u2, u2} β β β (instHMul.{u2} β (MulOneClass.toHasMul.{u2} β (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β rβ)))) (f x) (f y))) (h₃ : Eq.{succ u2} β (f (OfNat.ofNat.{u1} α 0 (OfNat.mk.{u1} α 0 (Zero.zero.{u1} α (AddZeroClass.toHasZero.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddCommMonoidWithOne.toAddMonoidWithOne.{u1} α (NonAssocSemiring.toAddCommMonoidWithOne.{u1} α rα))))))))) (OfNat.ofNat.{u2} β 0 (OfNat.mk.{u2} β 0 (Zero.zero.{u2} β (AddZeroClass.toHasZero.{u2} β (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddCommMonoidWithOne.toAddMonoidWithOne.{u2} β (NonAssocSemiring.toAddCommMonoidWithOne.{u2} β rβ))))))))) (h₄ : forall (x : α) (y : α), Eq.{succ u2} β (f (HAdd.hAdd.{u1, u1, u1} α α α (instHAdd.{u1} α (AddZeroClass.toHasAdd.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddCommMonoidWithOne.toAddMonoidWithOne.{u1} α (NonAssocSemiring.toAddCommMonoidWithOne.{u1} α rα)))))) x y)) (HAdd.hAdd.{u2, u2, u2} β β β (instHAdd.{u2} β (AddZeroClass.toHasAdd.{u2} β (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddCommMonoidWithOne.toAddMonoidWithOne.{u2} β (NonAssocSemiring.toAddCommMonoidWithOne.{u2} β rβ)))))) (f x) (f y))), Eq.{max (succ u1) (succ u2)} (α -> β) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) (RingHom.mk.{u1, u2} α β rα rβ f h₁ h₂ h₃ h₄)) f
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} (f : MonoidHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (h₁ : Eq.{succ u1} β (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (MonoidHom.toOneHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) f) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (AddZeroClass.toZero.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddCommMonoidWithOne.toAddMonoidWithOne.{u2} α (NonAssocSemiring.toAddCommMonoidWithOne.{u2} α rα)))))))) (OfNat.ofNat.{u1} β 0 (Zero.toOfNat0.{u1} β (AddZeroClass.toZero.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddCommMonoidWithOne.toAddMonoidWithOne.{u1} β (NonAssocSemiring.toAddCommMonoidWithOne.{u1} β rβ)))))))) (h₂ : forall (x : α) (y : α), Eq.{succ u1} β (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (MonoidHom.toOneHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) f) (HAdd.hAdd.{u2, u2, u2} α α α (instHAdd.{u2} α (AddZeroClass.toAdd.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddCommMonoidWithOne.toAddMonoidWithOne.{u2} α (NonAssocSemiring.toAddCommMonoidWithOne.{u2} α rα)))))) x y)) (HAdd.hAdd.{u1, u1, u1} β β β (instHAdd.{u1} β (AddZeroClass.toAdd.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddCommMonoidWithOne.toAddMonoidWithOne.{u1} β (NonAssocSemiring.toAddCommMonoidWithOne.{u1} β rβ)))))) (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (MonoidHom.toOneHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) f) x) (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (MonoidHom.toOneHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) f) y))), Eq.{max (succ u2) (succ u1)} (forall (a : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) (RingHom.mk.{u2, u1} α β rα rβ f h₁ h₂)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (MonoidHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (MonoidHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) α β (MulOneClass.toMul.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toMul.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (MonoidHomClass.toMulHomClass.{max u2 u1, u2, u1} (MonoidHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) (MonoidHom.monoidHomClass.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))))) f)
+  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} (f : MonoidHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (h₁ : Eq.{succ u1} β (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (MonoidHom.toOneHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) f) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (AddZeroClass.toZero.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddCommMonoidWithOne.toAddMonoidWithOne.{u2} α (NonAssocSemiring.toAddCommMonoidWithOne.{u2} α rα)))))))) (OfNat.ofNat.{u1} β 0 (Zero.toOfNat0.{u1} β (AddZeroClass.toZero.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddCommMonoidWithOne.toAddMonoidWithOne.{u1} β (NonAssocSemiring.toAddCommMonoidWithOne.{u1} β rβ)))))))) (h₂ : forall (x : α) (y : α), Eq.{succ u1} β (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (MonoidHom.toOneHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) f) (HAdd.hAdd.{u2, u2, u2} α α α (instHAdd.{u2} α (AddZeroClass.toAdd.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddCommMonoidWithOne.toAddMonoidWithOne.{u2} α (NonAssocSemiring.toAddCommMonoidWithOne.{u2} α rα)))))) x y)) (HAdd.hAdd.{u1, u1, u1} β β β (instHAdd.{u1} β (AddZeroClass.toAdd.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddCommMonoidWithOne.toAddMonoidWithOne.{u1} β (NonAssocSemiring.toAddCommMonoidWithOne.{u1} β rβ)))))) (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (MonoidHom.toOneHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) f) x) (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (MonoidHom.toOneHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) f) y))), Eq.{max (succ u2) (succ u1)} (forall (a : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) (RingHom.mk.{u2, u1} α β rα rβ f h₁ h₂)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (MonoidHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (MonoidHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) α β (MulOneClass.toMul.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toMul.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (MonoidHomClass.toMulHomClass.{max u2 u1, u2, u1} (MonoidHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) (MonoidHom.monoidHomClass.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))))) f)
 Case conversion may be inaccurate. Consider using '#align ring_hom.coe_mk RingHom.coe_mkₓ'. -/
 @[simp]
 theorem coe_mk (f : α → β) (h₁ h₂ h₃ h₄) : ⇑(⟨f, h₁, h₂, h₃, h₄⟩ : α →+* β) = f :=
@@ -717,7 +717,7 @@ theorem coe_mk (f : α → β) (h₁ h₂ h₃ h₄) : ⇑(⟨f, h₁, h₂, h
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} {F : Type.{u3}} [_inst_1 : RingHomClass.{u3, u1, u2} F α β rα rβ] (f : F), Eq.{max (succ u1) (succ u2)} ((fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) ((fun (a : Type.{u3}) (b : Sort.{max (succ u1) (succ u2)}) [self : HasLiftT.{succ u3, max (succ u1) (succ u2)} a b] => self.0) F (RingHom.{u1, u2} α β rα rβ) (HasLiftT.mk.{succ u3, max (succ u1) (succ u2)} F (RingHom.{u1, u2} α β rα rβ) (CoeTCₓ.coe.{succ u3, max (succ u1) (succ u2)} F (RingHom.{u1, u2} α β rα rβ) (RingHom.hasCoeT.{u3, u1, u2} F α β rα rβ _inst_1))) f)) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) ((fun (a : Type.{u3}) (b : Sort.{max (succ u1) (succ u2)}) [self : HasLiftT.{succ u3, max (succ u1) (succ u2)} a b] => self.0) F (RingHom.{u1, u2} α β rα rβ) (HasLiftT.mk.{succ u3, max (succ u1) (succ u2)} F (RingHom.{u1, u2} α β rα rβ) (CoeTCₓ.coe.{succ u3, max (succ u1) (succ u2)} F (RingHom.{u1, u2} α β rα rβ) (RingHom.hasCoeT.{u3, u1, u2} F α β rα rβ _inst_1))) f)) (coeFn.{succ u3, max (succ u1) (succ u2)} F (fun (_x : F) => α -> β) (FunLike.hasCoeToFun.{succ u3, succ u1, succ u2} F α (fun (_x : α) => β) (MulHomClass.toFunLike.{u3, u1, u2} F α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα))) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ))) (NonUnitalRingHomClass.toMulHomClass.{u3, u1, u2} F α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ) (RingHomClass.toNonUnitalRingHomClass.{u3, u1, u2} F α β rα rβ _inst_1)))) f)
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} {F : Type.{u3}} [_inst_1 : RingHomClass.{u3, u2, u1} F α β rα rβ] (f : F), Eq.{max (succ u2) (succ u1)} (forall (a : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) (RingHomClass.toRingHom.{u3, u2, u1} F α β rα rβ _inst_1 f)) (FunLike.coe.{succ u3, succ u2, succ u1} F α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{u3, u2, u1} F α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{u3, u2, u1} F α β rα rβ _inst_1))) f)
+  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} {F : Type.{u3}} [_inst_1 : RingHomClass.{u3, u2, u1} F α β rα rβ] (f : F), Eq.{max (succ u2) (succ u1)} (forall (a : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) (RingHomClass.toRingHom.{u3, u2, u1} F α β rα rβ _inst_1 f)) (FunLike.coe.{succ u3, succ u2, succ u1} F α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{u3, u2, u1} F α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{u3, u2, u1} F α β rα rβ _inst_1))) f)
 Case conversion may be inaccurate. Consider using '#align ring_hom.coe_coe RingHom.coe_coeₓ'. -/
 @[simp]
 theorem coe_coe {F : Type _} [RingHomClass F α β] (f : F) : ((f : α →+* β) : α → β) = f :=
@@ -757,7 +757,7 @@ theorem toMonoidHom_eq_coe (f : α →+* β) : f.toMonoidHom = f :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ), Eq.{max (succ u1) (succ u2)} ((fun (_x : MonoidWithZeroHom.{u1, u2} α β (NonAssocSemiring.toMulZeroOneClass.{u1} α rα) (NonAssocSemiring.toMulZeroOneClass.{u2} β rβ)) => α -> β) (RingHom.toMonoidWithZeroHom.{u1, u2} α β rα rβ f)) (coeFn.{max (succ u2) (succ u1), max (succ u1) (succ u2)} (MonoidWithZeroHom.{u1, u2} α β (NonAssocSemiring.toMulZeroOneClass.{u1} α rα) (NonAssocSemiring.toMulZeroOneClass.{u2} β rβ)) (fun (_x : MonoidWithZeroHom.{u1, u2} α β (NonAssocSemiring.toMulZeroOneClass.{u1} α rα) (NonAssocSemiring.toMulZeroOneClass.{u2} β rβ)) => α -> β) (MonoidWithZeroHom.hasCoeToFun.{u1, u2} α β (NonAssocSemiring.toMulZeroOneClass.{u1} α rα) (NonAssocSemiring.toMulZeroOneClass.{u2} β rβ)) (RingHom.toMonoidWithZeroHom.{u1, u2} α β rα rβ f)) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f)
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} (f : RingHom.{u2, u1} α β rα rβ), Eq.{max (succ u2) (succ u1)} (forall (a : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (MonoidWithZeroHom.{u2, u1} α β (NonAssocSemiring.toMulZeroOneClass.{u2} α rα) (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (MonoidWithZeroHom.{u2, u1} α β (NonAssocSemiring.toMulZeroOneClass.{u2} α rα) (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) α β (MulOneClass.toMul.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toMul.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (MonoidHomClass.toMulHomClass.{max u2 u1, u2, u1} (MonoidWithZeroHom.{u2, u1} α β (NonAssocSemiring.toMulZeroOneClass.{u2} α rα) (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) (MonoidWithZeroHomClass.toMonoidHomClass.{max u2 u1, u2, u1} (MonoidWithZeroHom.{u2, u1} α β (NonAssocSemiring.toMulZeroOneClass.{u2} α rα) (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) α β (NonAssocSemiring.toMulZeroOneClass.{u2} α rα) (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ) (MonoidWithZeroHom.monoidWithZeroHomClass.{u2, u1} α β (NonAssocSemiring.toMulZeroOneClass.{u2} α rα) (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))))) (RingHom.toMonoidWithZeroHom.{u2, u1} α β rα rβ f)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f)
+  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} (f : RingHom.{u2, u1} α β rα rβ), Eq.{max (succ u2) (succ u1)} (forall (a : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (MonoidWithZeroHom.{u2, u1} α β (NonAssocSemiring.toMulZeroOneClass.{u2} α rα) (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (MonoidWithZeroHom.{u2, u1} α β (NonAssocSemiring.toMulZeroOneClass.{u2} α rα) (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) α β (MulOneClass.toMul.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toMul.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (MonoidHomClass.toMulHomClass.{max u2 u1, u2, u1} (MonoidWithZeroHom.{u2, u1} α β (NonAssocSemiring.toMulZeroOneClass.{u2} α rα) (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) (MonoidWithZeroHomClass.toMonoidHomClass.{max u2 u1, u2, u1} (MonoidWithZeroHom.{u2, u1} α β (NonAssocSemiring.toMulZeroOneClass.{u2} α rα) (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) α β (NonAssocSemiring.toMulZeroOneClass.{u2} α rα) (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ) (MonoidWithZeroHom.monoidWithZeroHomClass.{u2, u1} α β (NonAssocSemiring.toMulZeroOneClass.{u2} α rα) (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))))) (RingHom.toMonoidWithZeroHom.{u2, u1} α β rα rβ f)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f)
 Case conversion may be inaccurate. Consider using '#align ring_hom.to_monoid_with_zero_hom_eq_coe RingHom.toMonoidWithZeroHom_eq_coeₓ'. -/
 @[simp]
 theorem toMonoidWithZeroHom_eq_coe (f : α →+* β) : (f.toMonoidWithZeroHom : α → β) = f :=
@@ -815,7 +815,7 @@ theorem coe_addMonoidHom_mk (f : α → β) (h₁ h₂ h₃ h₄) :
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ) (f' : α -> β), (Eq.{max (succ u1) (succ u2)} (α -> β) f' (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f)) -> (RingHom.{u1, u2} α β rα rβ)
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ) (f' : α -> β), (Eq.{max (succ u1) (succ u2)} (α -> β) f' (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (RingHom.{u1, u2} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u1, u2} α β rα rβ)))) f)) -> (RingHom.{u1, u2} α β rα rβ)
+  forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ) (f' : α -> β), (Eq.{max (succ u1) (succ u2)} (α -> β) f' (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (RingHom.{u1, u2} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u1, u2} α β rα rβ)))) f)) -> (RingHom.{u1, u2} α β rα rβ)
 Case conversion may be inaccurate. Consider using '#align ring_hom.copy RingHom.copyₓ'. -/
 /-- Copy of a `ring_hom` with a new `to_fun` equal to the old one. Useful to fix definitional
 equalities. -/
@@ -827,7 +827,7 @@ def copy (f : α →+* β) (f' : α → β) (h : f' = f) : α →+* β :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ) (f' : α -> β) (h : Eq.{max (succ u1) (succ u2)} (α -> β) f' (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f)), Eq.{max (succ u1) (succ u2)} (α -> β) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) (RingHom.copy.{u1, u2} α β rα rβ f f' h)) f'
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} (f : RingHom.{u2, u1} α β rα rβ) (f' : α -> β) (h : Eq.{max (succ u2) (succ u1)} (α -> β) f' (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f)), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) (RingHom.copy.{u2, u1} α β rα rβ f f' h)) f'
+  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} (f : RingHom.{u2, u1} α β rα rβ) (f' : α -> β) (h : Eq.{max (succ u2) (succ u1)} (α -> β) f' (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f)), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) (RingHom.copy.{u2, u1} α β rα rβ f f' h)) f'
 Case conversion may be inaccurate. Consider using '#align ring_hom.coe_copy RingHom.coe_copyₓ'. -/
 @[simp]
 theorem coe_copy (f : α →+* β) (f' : α → β) (h : f' = f) : ⇑(f.copy f' h) = f' :=
@@ -838,7 +838,7 @@ theorem coe_copy (f : α →+* β) (f' : α → β) (h : f' = f) : ⇑(f.copy f'
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ) (f' : α -> β) (h : Eq.{max (succ u1) (succ u2)} (α -> β) f' (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f)), Eq.{max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (RingHom.copy.{u1, u2} α β rα rβ f f' h) f
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} (f : RingHom.{u2, u1} α β rα rβ) (f' : α -> β) (h : Eq.{max (succ u2) (succ u1)} (α -> β) f' (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f)), Eq.{max (succ u2) (succ u1)} (RingHom.{u2, u1} α β rα rβ) (RingHom.copy.{u2, u1} α β rα rβ f f' h) f
+  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} (f : RingHom.{u2, u1} α β rα rβ) (f' : α -> β) (h : Eq.{max (succ u2) (succ u1)} (α -> β) f' (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f)), Eq.{max (succ u2) (succ u1)} (RingHom.{u2, u1} α β rα rβ) (RingHom.copy.{u2, u1} α β rα rβ f f' h) f
 Case conversion may be inaccurate. Consider using '#align ring_hom.copy_eq RingHom.copy_eqₓ'. -/
 theorem copy_eq (f : α →+* β) (f' : α → β) (h : f' = f) : f.copy f' h = f :=
   FunLike.ext' h
@@ -858,7 +858,7 @@ variable (f : α →+* β) {x y : α} {rα rβ}
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} {f : RingHom.{u1, u2} α β rα rβ} {g : RingHom.{u1, u2} α β rα rβ}, (Eq.{max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) f g) -> (forall (x : α), Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f x) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) g x))
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} {f : RingHom.{u2, u1} α β rα rβ} {g : RingHom.{u2, u1} α β rα rβ}, (Eq.{max (succ u2) (succ u1)} (RingHom.{u2, u1} α β rα rβ) f g) -> (forall (x : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) g x))
+  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} {f : RingHom.{u2, u1} α β rα rβ} {g : RingHom.{u2, u1} α β rα rβ}, (Eq.{max (succ u2) (succ u1)} (RingHom.{u2, u1} α β rα rβ) f g) -> (forall (x : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) g x))
 Case conversion may be inaccurate. Consider using '#align ring_hom.congr_fun RingHom.congr_funₓ'. -/
 theorem congr_fun {f g : α →+* β} (h : f = g) (x : α) : f x = g x :=
   FunLike.congr_fun h x
@@ -868,7 +868,7 @@ theorem congr_fun {f g : α →+* β} (h : f = g) (x : α) : f x = g x :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ) {x : α} {y : α}, (Eq.{succ u1} α x y) -> (Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f x) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f y))
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} (f : RingHom.{u2, u1} α β rα rβ) {x : α} {y : α}, (Eq.{succ u2} α x y) -> (Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f y))
+  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} (f : RingHom.{u2, u1} α β rα rβ) {x : α} {y : α}, (Eq.{succ u2} α x y) -> (Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f y))
 Case conversion may be inaccurate. Consider using '#align ring_hom.congr_arg RingHom.congr_argₓ'. -/
 theorem congr_arg (f : α →+* β) {x y : α} (h : x = y) : f x = f y :=
   FunLike.congr_arg f h
@@ -878,7 +878,7 @@ theorem congr_arg (f : α →+* β) {x y : α} (h : x = y) : f x = f y :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} {{f : RingHom.{u1, u2} α β rα rβ}} {{g : RingHom.{u1, u2} α β rα rβ}}, (Eq.{max (succ u1) (succ u2)} ((fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) f) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) g)) -> (Eq.{max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) f g)
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} {{f : RingHom.{u2, u1} α β rα rβ}} {{g : RingHom.{u2, u1} α β rα rβ}}, (Eq.{max (succ u2) (succ u1)} (forall (a : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) g)) -> (Eq.{max (succ u2) (succ u1)} (RingHom.{u2, u1} α β rα rβ) f g)
+  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} {{f : RingHom.{u2, u1} α β rα rβ}} {{g : RingHom.{u2, u1} α β rα rβ}}, (Eq.{max (succ u2) (succ u1)} (forall (a : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) g)) -> (Eq.{max (succ u2) (succ u1)} (RingHom.{u2, u1} α β rα rβ) f g)
 Case conversion may be inaccurate. Consider using '#align ring_hom.coe_inj RingHom.coe_injₓ'. -/
 theorem coe_inj ⦃f g : α →+* β⦄ (h : (f : α → β) = g) : f = g :=
   FunLike.coe_injective h
@@ -888,7 +888,7 @@ theorem coe_inj ⦃f g : α →+* β⦄ (h : (f : α → β) = g) : f = g :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} {{f : RingHom.{u1, u2} α β rα rβ}} {{g : RingHom.{u1, u2} α β rα rβ}}, (forall (x : α), Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f x) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) g x)) -> (Eq.{max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) f g)
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} {{f : RingHom.{u2, u1} α β rα rβ}} {{g : RingHom.{u2, u1} α β rα rβ}}, (forall (x : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) g x)) -> (Eq.{max (succ u2) (succ u1)} (RingHom.{u2, u1} α β rα rβ) f g)
+  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} {{f : RingHom.{u2, u1} α β rα rβ}} {{g : RingHom.{u2, u1} α β rα rβ}}, (forall (x : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) g x)) -> (Eq.{max (succ u2) (succ u1)} (RingHom.{u2, u1} α β rα rβ) f g)
 Case conversion may be inaccurate. Consider using '#align ring_hom.ext RingHom.extₓ'. -/
 @[ext]
 theorem ext ⦃f g : α →+* β⦄ : (∀ x, f x = g x) → f = g :=
@@ -899,7 +899,7 @@ theorem ext ⦃f g : α →+* β⦄ : (∀ x, f x = g x) → f = g :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} {f : RingHom.{u1, u2} α β rα rβ} {g : RingHom.{u1, u2} α β rα rβ}, Iff (Eq.{max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) f g) (forall (x : α), Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f x) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) g x))
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} {f : RingHom.{u2, u1} α β rα rβ} {g : RingHom.{u2, u1} α β rα rβ}, Iff (Eq.{max (succ u2) (succ u1)} (RingHom.{u2, u1} α β rα rβ) f g) (forall (x : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) g x))
+  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} {f : RingHom.{u2, u1} α β rα rβ} {g : RingHom.{u2, u1} α β rα rβ}, Iff (Eq.{max (succ u2) (succ u1)} (RingHom.{u2, u1} α β rα rβ) f g) (forall (x : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) g x))
 Case conversion may be inaccurate. Consider using '#align ring_hom.ext_iff RingHom.ext_iffₓ'. -/
 theorem ext_iff {f g : α →+* β} : f = g ↔ ∀ x, f x = g x :=
   FunLike.ext_iff
@@ -909,7 +909,7 @@ theorem ext_iff {f g : α →+* β} : f = g ↔ ∀ x, f x = g x :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ) (h₁ : Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f (OfNat.ofNat.{u1} α 1 (OfNat.mk.{u1} α 1 (One.one.{u1} α (MulOneClass.toHasOne.{u1} α (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α rα))))))) (OfNat.ofNat.{u2} β 1 (OfNat.mk.{u2} β 1 (One.one.{u2} β (MulOneClass.toHasOne.{u2} β (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β rβ))))))) (h₂ : forall (x : α) (y : α), Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f (HMul.hMul.{u1, u1, u1} α α α (instHMul.{u1} α (MulOneClass.toHasMul.{u1} α (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α rα)))) x y)) (HMul.hMul.{u2, u2, u2} β β β (instHMul.{u2} β (MulOneClass.toHasMul.{u2} β (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β rβ)))) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f x) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f y))) (h₃ : Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f (OfNat.ofNat.{u1} α 0 (OfNat.mk.{u1} α 0 (Zero.zero.{u1} α (AddZeroClass.toHasZero.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddCommMonoidWithOne.toAddMonoidWithOne.{u1} α (NonAssocSemiring.toAddCommMonoidWithOne.{u1} α rα))))))))) (OfNat.ofNat.{u2} β 0 (OfNat.mk.{u2} β 0 (Zero.zero.{u2} β (AddZeroClass.toHasZero.{u2} β (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddCommMonoidWithOne.toAddMonoidWithOne.{u2} β (NonAssocSemiring.toAddCommMonoidWithOne.{u2} β rβ))))))))) (h₄ : forall (x : α) (y : α), Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f (HAdd.hAdd.{u1, u1, u1} α α α (instHAdd.{u1} α (AddZeroClass.toHasAdd.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddCommMonoidWithOne.toAddMonoidWithOne.{u1} α (NonAssocSemiring.toAddCommMonoidWithOne.{u1} α rα)))))) x y)) (HAdd.hAdd.{u2, u2, u2} β β β (instHAdd.{u2} β (AddZeroClass.toHasAdd.{u2} β (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddCommMonoidWithOne.toAddMonoidWithOne.{u2} β (NonAssocSemiring.toAddCommMonoidWithOne.{u2} β rβ)))))) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f x) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f y))), Eq.{max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (RingHom.mk.{u1, u2} α β rα rβ (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f) h₁ h₂ h₃ h₄) f
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} (f : RingHom.{u2, u1} α β rα rβ) (h₁ : Eq.{succ u1} β (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))))) (OfNat.ofNat.{u1} β 1 (One.toOfNat1.{u1} β (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)))))) (h₂ : forall (x : α) (y : α), Eq.{succ u1} β (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (OneHom.mk.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f) h₁) (HMul.hMul.{u2, u2, u2} α α α (instHMul.{u2} α (MulOneClass.toMul.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))) x y)) (HMul.hMul.{u1, u1, u1} β β β (instHMul.{u1} β (MulOneClass.toMul.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)))) (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (OneHom.mk.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f) h₁) x) (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (OneHom.mk.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f) h₁) y))) (h₃ : Eq.{succ u1} β (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (MonoidHom.toOneHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) (MonoidHom.mk.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) (OneHom.mk.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f) h₁) h₂)) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (AddZeroClass.toZero.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddCommMonoidWithOne.toAddMonoidWithOne.{u2} α (NonAssocSemiring.toAddCommMonoidWithOne.{u2} α rα)))))))) (OfNat.ofNat.{u1} β 0 (Zero.toOfNat0.{u1} β (AddZeroClass.toZero.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddCommMonoidWithOne.toAddMonoidWithOne.{u1} β (NonAssocSemiring.toAddCommMonoidWithOne.{u1} β rβ)))))))) (h₄ : forall (x : α) (y : α), Eq.{succ u1} β (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} 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(MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f) h₁) h₂)) (HAdd.hAdd.{u2, u2, u2} α α α (instHAdd.{u2} α (AddZeroClass.toAdd.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddCommMonoidWithOne.toAddMonoidWithOne.{u2} α (NonAssocSemiring.toAddCommMonoidWithOne.{u2} α rα)))))) x y)) (HAdd.hAdd.{u1, u1, u1} β β β (instHAdd.{u1} β (AddZeroClass.toAdd.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddCommMonoidWithOne.toAddMonoidWithOne.{u1} β (NonAssocSemiring.toAddCommMonoidWithOne.{u1} β rβ)))))) (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (MonoidHom.toOneHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) (MonoidHom.mk.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) (OneHom.mk.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f) h₁) h₂)) x) (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (MonoidHom.toOneHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) (MonoidHom.mk.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) (OneHom.mk.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f) h₁) h₂)) y))), Eq.{max (succ u2) (succ u1)} (RingHom.{u2, u1} α β rα rβ) (RingHom.mk.{u2, u1} α β rα rβ (MonoidHom.mk.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) (OneHom.mk.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f) h₁) h₂) h₃ h₄) f
+  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} (f : RingHom.{u2, u1} α β rα rβ) (h₁ : Eq.{succ u1} β (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))))) (OfNat.ofNat.{u1} β 1 (One.toOfNat1.{u1} β (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)))))) (h₂ : forall (x : α) (y : α), Eq.{succ u1} β (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (OneHom.mk.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f) h₁) (HMul.hMul.{u2, u2, u2} α α α (instHMul.{u2} α (MulOneClass.toMul.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))) x y)) (HMul.hMul.{u1, u1, u1} β β β (instHMul.{u1} β (MulOneClass.toMul.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)))) (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (OneHom.mk.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f) h₁) x) (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (OneHom.mk.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f) h₁) y))) (h₃ : Eq.{succ u1} β (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (MonoidHom.toOneHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) (MonoidHom.mk.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) (OneHom.mk.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f) h₁) h₂)) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (AddZeroClass.toZero.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddCommMonoidWithOne.toAddMonoidWithOne.{u2} α (NonAssocSemiring.toAddCommMonoidWithOne.{u2} α rα)))))))) (OfNat.ofNat.{u1} β 0 (Zero.toOfNat0.{u1} β (AddZeroClass.toZero.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddCommMonoidWithOne.toAddMonoidWithOne.{u1} β (NonAssocSemiring.toAddCommMonoidWithOne.{u1} β rβ)))))))) (h₄ : forall (x : α) (y : α), Eq.{succ u1} β (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (MonoidHom.toOneHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) (MonoidHom.mk.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) (OneHom.mk.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f) h₁) h₂)) (HAdd.hAdd.{u2, u2, u2} α α α (instHAdd.{u2} α (AddZeroClass.toAdd.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddCommMonoidWithOne.toAddMonoidWithOne.{u2} α (NonAssocSemiring.toAddCommMonoidWithOne.{u2} α rα)))))) x y)) (HAdd.hAdd.{u1, u1, u1} β β β (instHAdd.{u1} β (AddZeroClass.toAdd.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddCommMonoidWithOne.toAddMonoidWithOne.{u1} β (NonAssocSemiring.toAddCommMonoidWithOne.{u1} β rβ)))))) (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (MonoidHom.toOneHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) (MonoidHom.mk.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) (OneHom.mk.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f) h₁) h₂)) x) (OneHom.toFun.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (MonoidHom.toOneHom.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) (MonoidHom.mk.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) (OneHom.mk.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f) h₁) h₂)) y))), Eq.{max (succ u2) (succ u1)} (RingHom.{u2, u1} α β rα rβ) (RingHom.mk.{u2, u1} α β rα rβ (MonoidHom.mk.{u2, u1} α β (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)) (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ)) (OneHom.mk.{u2, u1} α β (MulOneClass.toOne.{u2} α (MulZeroOneClass.toMulOneClass.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))) (MulOneClass.toOne.{u1} β (MulZeroOneClass.toMulOneClass.{u1} β (NonAssocSemiring.toMulZeroOneClass.{u1} β rβ))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f) h₁) h₂) h₃ h₄) f
 Case conversion may be inaccurate. Consider using '#align ring_hom.mk_coe RingHom.mk_coeₓ'. -/
 @[simp]
 theorem mk_coe (f : α →+* β) (h₁ h₂ h₃ h₄) : RingHom.mk f h₁ h₂ h₃ h₄ = f :=
@@ -940,7 +940,7 @@ theorem coe_monoidHom_injective : Injective (coe : (α →+* β) → α →* β)
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ), Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f (OfNat.ofNat.{u1} α 0 (OfNat.mk.{u1} α 0 (Zero.zero.{u1} α (MulZeroClass.toHasZero.{u1} α (NonUnitalNonAssocSemiring.toMulZeroClass.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα))))))) (OfNat.ofNat.{u2} β 0 (OfNat.mk.{u2} β 0 (Zero.zero.{u2} β (MulZeroClass.toHasZero.{u2} β (NonUnitalNonAssocSemiring.toMulZeroClass.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ))))))
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} (f : RingHom.{u2, u1} α β rα rβ), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))))) (OfNat.ofNat.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))))) 0 (Zero.toOfNat0.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))))) (MulZeroOneClass.toZero.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))))) (NonAssocSemiring.toMulZeroOneClass.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))))) rβ))))
+  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} (f : RingHom.{u2, u1} α β rα rβ), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))))) (OfNat.ofNat.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))))) 0 (Zero.toOfNat0.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))))) (MulZeroOneClass.toZero.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))))) (NonAssocSemiring.toMulZeroOneClass.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα))))) rβ))))
 Case conversion may be inaccurate. Consider using '#align ring_hom.map_zero RingHom.map_zeroₓ'. -/
 /-- Ring homomorphisms map zero to zero. -/
 protected theorem map_zero (f : α →+* β) : f 0 = 0 :=
@@ -951,7 +951,7 @@ protected theorem map_zero (f : α →+* β) : f 0 = 0 :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ), Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f (OfNat.ofNat.{u1} α 1 (OfNat.mk.{u1} α 1 (One.one.{u1} α (AddMonoidWithOne.toOne.{u1} α (AddCommMonoidWithOne.toAddMonoidWithOne.{u1} α (NonAssocSemiring.toAddCommMonoidWithOne.{u1} α rα))))))) (OfNat.ofNat.{u2} β 1 (OfNat.mk.{u2} β 1 (One.one.{u2} β (AddMonoidWithOne.toOne.{u2} β (AddCommMonoidWithOne.toAddMonoidWithOne.{u2} β (NonAssocSemiring.toAddCommMonoidWithOne.{u2} β rβ))))))
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} (f : RingHom.{u2, u1} α β rα rβ), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα)))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα)))) (OfNat.ofNat.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα)))) 1 (One.toOfNat1.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα)))) (NonAssocSemiring.toOne.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα)))) rβ)))
+  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} (f : RingHom.{u2, u1} α β rα rβ), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα)))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα)))) (OfNat.ofNat.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα)))) 1 (One.toOfNat1.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα)))) (NonAssocSemiring.toOne.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα)))) rβ)))
 Case conversion may be inaccurate. Consider using '#align ring_hom.map_one RingHom.map_oneₓ'. -/
 /-- Ring homomorphisms map one to one. -/
 protected theorem map_one (f : α →+* β) : f 1 = 1 :=
@@ -962,7 +962,7 @@ protected theorem map_one (f : α →+* β) : f 1 = 1 :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ) (a : α) (b : α), Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f (HAdd.hAdd.{u1, u1, u1} α α α (instHAdd.{u1} α (Distrib.toHasAdd.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)))) a b)) (HAdd.hAdd.{u2, u2, u2} β β β (instHAdd.{u2} β (Distrib.toHasAdd.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ)))) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f a) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f b))
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} (f : RingHom.{u2, u1} α β rα rβ) (a : α) (b : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (HAdd.hAdd.{u2, u2, u2} α α α (instHAdd.{u2} α (Distrib.toAdd.{u2} α (NonUnitalNonAssocSemiring.toDistrib.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)))) a b)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f (HAdd.hAdd.{u2, u2, u2} α α α (instHAdd.{u2} α (Distrib.toAdd.{u2} α (NonUnitalNonAssocSemiring.toDistrib.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)))) a b)) (HAdd.hAdd.{u1, u1, u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) b) ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (instHAdd.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (Distrib.toAdd.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (NonUnitalNonAssocSemiring.toDistrib.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) rβ)))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f a) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f b))
+  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} (f : RingHom.{u2, u1} α β rα rβ) (a : α) (b : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (HAdd.hAdd.{u2, u2, u2} α α α (instHAdd.{u2} α (Distrib.toAdd.{u2} α (NonUnitalNonAssocSemiring.toDistrib.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)))) a b)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f (HAdd.hAdd.{u2, u2, u2} α α α (instHAdd.{u2} α (Distrib.toAdd.{u2} α (NonUnitalNonAssocSemiring.toDistrib.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)))) a b)) (HAdd.hAdd.{u1, u1, u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) b) ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (instHAdd.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (Distrib.toAdd.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (NonUnitalNonAssocSemiring.toDistrib.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) rβ)))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f a) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f b))
 Case conversion may be inaccurate. Consider using '#align ring_hom.map_add RingHom.map_addₓ'. -/
 /-- Ring homomorphisms preserve addition. -/
 protected theorem map_add (f : α →+* β) : ∀ a b, f (a + b) = f a + f b :=
@@ -973,7 +973,7 @@ protected theorem map_add (f : α →+* β) : ∀ a b, f (a + b) = f a + f b :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ) (a : α) (b : α), Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f (HMul.hMul.{u1, u1, u1} α α α (instHMul.{u1} α (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)))) a b)) (HMul.hMul.{u2, u2, u2} β β β (instHMul.{u2} β (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ)))) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f a) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f b))
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} (f : RingHom.{u2, u1} α β rα rβ) (a : α) (b : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (HMul.hMul.{u2, u2, u2} α α α (instHMul.{u2} α (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα))) a b)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f (HMul.hMul.{u2, u2, u2} α α α (instHMul.{u2} α (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα))) a b)) (HMul.hMul.{u1, u1, u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) b) ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (instHMul.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (NonUnitalNonAssocSemiring.toMul.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) rβ))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f a) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f b))
+  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} (f : RingHom.{u2, u1} α β rα rβ) (a : α) (b : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (HMul.hMul.{u2, u2, u2} α α α (instHMul.{u2} α (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα))) a b)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f (HMul.hMul.{u2, u2, u2} α α α (instHMul.{u2} α (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα))) a b)) (HMul.hMul.{u1, u1, u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) b) ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (instHMul.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (NonUnitalNonAssocSemiring.toMul.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) rβ))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f a) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u2, u1} α β rα rβ)))) f b))
 Case conversion may be inaccurate. Consider using '#align ring_hom.map_mul RingHom.map_mulₓ'. -/
 /-- Ring homomorphisms preserve multiplication. -/
 protected theorem map_mul (f : α →+* β) : ∀ a b, f (a * b) = f a * f b :=
@@ -994,7 +994,7 @@ protected theorem map_bit1 (f : α →+* β) : ∀ a, f (bit1 a) = bit1 (f a) :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} {F : Type.{u3}} [_inst_1 : RingHomClass.{u3, u1, u2} F α β rα rβ] (f : F) (p : Prop) [_inst_2 : Decidable p], Eq.{succ u2} β (coeFn.{succ u3, max (succ u1) (succ u2)} F (fun (_x : F) => α -> β) (FunLike.hasCoeToFun.{succ u3, succ u1, succ u2} F α (fun (_x : α) => β) (MulHomClass.toFunLike.{u3, u1, u2} F α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα))) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ))) (NonUnitalRingHomClass.toMulHomClass.{u3, u1, u2} F α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ) (RingHomClass.toNonUnitalRingHomClass.{u3, u1, u2} F α β rα rβ _inst_1)))) f (ite.{succ u1} α p _inst_2 (OfNat.ofNat.{u1} α 0 (OfNat.mk.{u1} α 0 (Zero.zero.{u1} α (MulZeroClass.toHasZero.{u1} α (NonUnitalNonAssocSemiring.toMulZeroClass.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)))))) (OfNat.ofNat.{u1} α 1 (OfNat.mk.{u1} α 1 (One.one.{u1} α (AddMonoidWithOne.toOne.{u1} α (AddCommMonoidWithOne.toAddMonoidWithOne.{u1} α (NonAssocSemiring.toAddCommMonoidWithOne.{u1} α rα)))))))) (ite.{succ u2} β p _inst_2 (OfNat.ofNat.{u2} β 0 (OfNat.mk.{u2} β 0 (Zero.zero.{u2} β (MulZeroClass.toHasZero.{u2} β (NonUnitalNonAssocSemiring.toMulZeroClass.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ)))))) (OfNat.ofNat.{u2} β 1 (OfNat.mk.{u2} β 1 (One.one.{u2} β (AddMonoidWithOne.toOne.{u2} β (AddCommMonoidWithOne.toAddMonoidWithOne.{u2} β (NonAssocSemiring.toAddCommMonoidWithOne.{u2} β rβ)))))))
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} {F : Type.{u3}} [_inst_1 : RingHomClass.{u3, u2, u1} F α β rα rβ] (f : F) (p : Prop) [_inst_2 : Decidable p], Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))))) (FunLike.coe.{succ u3, succ u2, succ u1} F α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{u3, u2, u1} F α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{u3, u2, u1} F α β rα rβ _inst_1))) f (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))))) (ite.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))))) p _inst_2 (OfNat.ofNat.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))))) 0 (Zero.toOfNat0.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))))) (MulZeroOneClass.toZero.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))))) (NonAssocSemiring.toMulZeroOneClass.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))))) rβ)))) (OfNat.ofNat.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))))) 1 (One.toOfNat1.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))))) (NonAssocSemiring.toOne.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))))) rβ))))
+  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} {F : Type.{u3}} [_inst_1 : RingHomClass.{u3, u2, u1} F α β rα rβ] (f : F) (p : Prop) [_inst_2 : Decidable p], Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))))) (FunLike.coe.{succ u3, succ u2, succ u1} F α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{u3, u2, u1} F α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{u3, u2, u1} F α β rα rβ _inst_1))) f (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))))) (ite.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))))) p _inst_2 (OfNat.ofNat.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))))) 0 (Zero.toOfNat0.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))))) (MulZeroOneClass.toZero.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))))) (NonAssocSemiring.toMulZeroOneClass.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))))) rβ)))) (OfNat.ofNat.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))))) 1 (One.toOfNat1.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))))) (NonAssocSemiring.toOne.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))) (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))))) rβ))))
 Case conversion may be inaccurate. Consider using '#align ring_hom.map_ite_zero_one RingHom.map_ite_zero_oneₓ'. -/
 @[simp]
 theorem map_ite_zero_one {F : Type _} [RingHomClass F α β] (f : F) (p : Prop) [Decidable p] :
@@ -1005,7 +1005,7 @@ theorem map_ite_zero_one {F : Type _} [RingHomClass F α β] (f : F) (p : Prop)
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} {F : Type.{u3}} [_inst_1 : RingHomClass.{u3, u1, u2} F α β rα rβ] (f : F) (p : Prop) [_inst_2 : Decidable p], Eq.{succ u2} β (coeFn.{succ u3, max (succ u1) (succ u2)} F (fun (_x : F) => α -> β) (FunLike.hasCoeToFun.{succ u3, succ u1, succ u2} F α (fun (_x : α) => β) (MulHomClass.toFunLike.{u3, u1, u2} F α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα))) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ))) (NonUnitalRingHomClass.toMulHomClass.{u3, u1, u2} F α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ) (RingHomClass.toNonUnitalRingHomClass.{u3, u1, u2} F α β rα rβ _inst_1)))) f (ite.{succ u1} α p _inst_2 (OfNat.ofNat.{u1} α 1 (OfNat.mk.{u1} α 1 (One.one.{u1} α (AddMonoidWithOne.toOne.{u1} α (AddCommMonoidWithOne.toAddMonoidWithOne.{u1} α (NonAssocSemiring.toAddCommMonoidWithOne.{u1} α rα)))))) (OfNat.ofNat.{u1} α 0 (OfNat.mk.{u1} α 0 (Zero.zero.{u1} α (MulZeroClass.toHasZero.{u1} α (NonUnitalNonAssocSemiring.toMulZeroClass.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)))))))) (ite.{succ u2} β p _inst_2 (OfNat.ofNat.{u2} β 1 (OfNat.mk.{u2} β 1 (One.one.{u2} β (AddMonoidWithOne.toOne.{u2} β (AddCommMonoidWithOne.toAddMonoidWithOne.{u2} β (NonAssocSemiring.toAddCommMonoidWithOne.{u2} β rβ)))))) (OfNat.ofNat.{u2} β 0 (OfNat.mk.{u2} β 0 (Zero.zero.{u2} β (MulZeroClass.toHasZero.{u2} β (NonUnitalNonAssocSemiring.toMulZeroClass.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ)))))))
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} {F : Type.{u3}} [_inst_1 : RingHomClass.{u3, u2, u1} F α β rα rβ] (f : F) (p : Prop) [_inst_2 : Decidable p], Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))))) (FunLike.coe.{succ u3, succ u2, succ u1} F α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{u3, u2, u1} F α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{u3, u2, u1} F α β rα rβ _inst_1))) f (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))))) (ite.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))))) p _inst_2 (OfNat.ofNat.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))))) 1 (One.toOfNat1.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))))) (NonAssocSemiring.toOne.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))))) rβ))) (OfNat.ofNat.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))))) 0 (Zero.toOfNat0.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))))) (MulZeroOneClass.toZero.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))))) (NonAssocSemiring.toMulZeroOneClass.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))))) rβ)))))
+  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonAssocSemiring.{u2} α} {rβ : NonAssocSemiring.{u1} β} {F : Type.{u3}} [_inst_1 : RingHomClass.{u3, u2, u1} F α β rα rβ] (f : F) (p : Prop) [_inst_2 : Decidable p], Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))))) (FunLike.coe.{succ u3, succ u2, succ u1} F α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{u3, u2, u1} F α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β rβ) (RingHomClass.toNonUnitalRingHomClass.{u3, u2, u1} F α β rα rβ _inst_1))) f (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))))) (ite.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))))) p _inst_2 (OfNat.ofNat.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))))) 1 (One.toOfNat1.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))))) (NonAssocSemiring.toOne.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))))) rβ))) (OfNat.ofNat.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))))) 0 (Zero.toOfNat0.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))))) (MulZeroOneClass.toZero.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))))) (NonAssocSemiring.toMulZeroOneClass.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (ite.{succ u2} α p _inst_2 (OfNat.ofNat.{u2} α 1 (One.toOfNat1.{u2} α (NonAssocSemiring.toOne.{u2} α rα))) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (MulZeroOneClass.toZero.{u2} α (NonAssocSemiring.toMulZeroOneClass.{u2} α rα)))))) rβ)))))
 Case conversion may be inaccurate. Consider using '#align ring_hom.map_ite_one_zero RingHom.map_ite_one_zeroₓ'. -/
 @[simp]
 theorem map_ite_one_zero {F : Type _} [RingHomClass F α β] (f : F) (p : Prop) [Decidable p] :
@@ -1016,7 +1016,7 @@ theorem map_ite_one_zero {F : Type _} [RingHomClass F α β] (f : F) (p : Prop)
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ), Iff (Eq.{succ u2} β (OfNat.ofNat.{u2} β 0 (OfNat.mk.{u2} β 0 (Zero.zero.{u2} β (MulZeroClass.toHasZero.{u2} β (NonUnitalNonAssocSemiring.toMulZeroClass.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ)))))) (OfNat.ofNat.{u2} β 1 (OfNat.mk.{u2} β 1 (One.one.{u2} β (AddMonoidWithOne.toOne.{u2} β (AddCommMonoidWithOne.toAddMonoidWithOne.{u2} β (NonAssocSemiring.toAddCommMonoidWithOne.{u2} β rβ))))))) (Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f (OfNat.ofNat.{u1} α 1 (OfNat.mk.{u1} α 1 (One.one.{u1} α (AddMonoidWithOne.toOne.{u1} α (AddCommMonoidWithOne.toAddMonoidWithOne.{u1} α (NonAssocSemiring.toAddCommMonoidWithOne.{u1} α rα))))))) (OfNat.ofNat.{u2} β 0 (OfNat.mk.{u2} β 0 (Zero.zero.{u2} β (MulZeroClass.toHasZero.{u2} β (NonUnitalNonAssocSemiring.toMulZeroClass.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ)))))))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ), Iff (Eq.{succ u2} β (OfNat.ofNat.{u2} β 0 (Zero.toOfNat0.{u2} β (MulZeroOneClass.toZero.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β rβ)))) (OfNat.ofNat.{u2} β 1 (One.toOfNat1.{u2} β (NonAssocSemiring.toOne.{u2} β rβ)))) (Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (RingHom.{u1, u2} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u1, u2} α β rα rβ)))) f (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) (OfNat.ofNat.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) 0 (Zero.toOfNat0.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) (MulZeroOneClass.toZero.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) (NonAssocSemiring.toMulZeroOneClass.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) rβ)))))
+  forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ), Iff (Eq.{succ u2} β (OfNat.ofNat.{u2} β 0 (Zero.toOfNat0.{u2} β (MulZeroOneClass.toZero.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β rβ)))) (OfNat.ofNat.{u2} β 1 (One.toOfNat1.{u2} β (NonAssocSemiring.toOne.{u2} β rβ)))) (Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (RingHom.{u1, u2} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u1, u2} α β rα rβ)))) f (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) (OfNat.ofNat.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) 0 (Zero.toOfNat0.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) (MulZeroOneClass.toZero.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) (NonAssocSemiring.toMulZeroOneClass.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) rβ)))))
 Case conversion may be inaccurate. Consider using '#align ring_hom.codomain_trivial_iff_map_one_eq_zero RingHom.codomain_trivial_iff_map_one_eq_zeroₓ'. -/
 /-- `f : α →+* β` has a trivial codomain iff `f 1 = 0`. -/
 theorem codomain_trivial_iff_map_one_eq_zero : (0 : β) = 1 ↔ f 1 = 0 := by rw [map_one, eq_comm]
@@ -1026,7 +1026,7 @@ theorem codomain_trivial_iff_map_one_eq_zero : (0 : β) = 1 ↔ f 1 = 0 := by rw
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ), Iff (Eq.{succ u2} β (OfNat.ofNat.{u2} β 0 (OfNat.mk.{u2} β 0 (Zero.zero.{u2} β (MulZeroClass.toHasZero.{u2} β (NonUnitalNonAssocSemiring.toMulZeroClass.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ)))))) (OfNat.ofNat.{u2} β 1 (OfNat.mk.{u2} β 1 (One.one.{u2} β (AddMonoidWithOne.toOne.{u2} β (AddCommMonoidWithOne.toAddMonoidWithOne.{u2} β (NonAssocSemiring.toAddCommMonoidWithOne.{u2} β rβ))))))) (forall (x : α), Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f x) (OfNat.ofNat.{u2} β 0 (OfNat.mk.{u2} β 0 (Zero.zero.{u2} β (MulZeroClass.toHasZero.{u2} β (NonUnitalNonAssocSemiring.toMulZeroClass.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ)))))))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ), Iff (Eq.{succ u2} β (OfNat.ofNat.{u2} β 0 (Zero.toOfNat0.{u2} β (MulZeroOneClass.toZero.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β rβ)))) (OfNat.ofNat.{u2} β 1 (One.toOfNat1.{u2} β (NonAssocSemiring.toOne.{u2} β rβ)))) (forall (x : α), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (RingHom.{u1, u2} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u1, u2} α β rα rβ)))) f x) (OfNat.ofNat.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) 0 (Zero.toOfNat0.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) (MulZeroOneClass.toZero.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) (NonAssocSemiring.toMulZeroOneClass.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) rβ)))))
+  forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ), Iff (Eq.{succ u2} β (OfNat.ofNat.{u2} β 0 (Zero.toOfNat0.{u2} β (MulZeroOneClass.toZero.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β rβ)))) (OfNat.ofNat.{u2} β 1 (One.toOfNat1.{u2} β (NonAssocSemiring.toOne.{u2} β rβ)))) (forall (x : α), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (RingHom.{u1, u2} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u1, u2} α β rα rβ)))) f x) (OfNat.ofNat.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) 0 (Zero.toOfNat0.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) (MulZeroOneClass.toZero.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) (NonAssocSemiring.toMulZeroOneClass.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) rβ)))))
 Case conversion may be inaccurate. Consider using '#align ring_hom.codomain_trivial_iff_range_trivial RingHom.codomain_trivial_iff_range_trivialₓ'. -/
 /-- `f : α →+* β` has a trivial codomain iff it has a trivial range. -/
 theorem codomain_trivial_iff_range_trivial : (0 : β) = 1 ↔ ∀ x, f x = 0 :=
@@ -1038,7 +1038,7 @@ theorem codomain_trivial_iff_range_trivial : (0 : β) = 1 ↔ ∀ x, f x = 0 :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ), Iff (Eq.{succ u2} β (OfNat.ofNat.{u2} β 0 (OfNat.mk.{u2} β 0 (Zero.zero.{u2} β (MulZeroClass.toHasZero.{u2} β (NonUnitalNonAssocSemiring.toMulZeroClass.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ)))))) (OfNat.ofNat.{u2} β 1 (OfNat.mk.{u2} β 1 (One.one.{u2} β (AddMonoidWithOne.toOne.{u2} β (AddCommMonoidWithOne.toAddMonoidWithOne.{u2} β (NonAssocSemiring.toAddCommMonoidWithOne.{u2} β rβ))))))) (Eq.{succ u2} (Set.{u2} β) (Set.range.{u2, succ u1} β α (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f)) (Singleton.singleton.{u2, u2} β (Set.{u2} β) (Set.hasSingleton.{u2} β) (OfNat.ofNat.{u2} β 0 (OfNat.mk.{u2} β 0 (Zero.zero.{u2} β (MulZeroClass.toHasZero.{u2} β (NonUnitalNonAssocSemiring.toMulZeroClass.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ))))))))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ), Iff (Eq.{succ u2} β (OfNat.ofNat.{u2} β 0 (Zero.toOfNat0.{u2} β (MulZeroOneClass.toZero.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β rβ)))) (OfNat.ofNat.{u2} β 1 (One.toOfNat1.{u2} β (NonAssocSemiring.toOne.{u2} β rβ)))) (Eq.{succ u2} (Set.{u2} β) (Set.range.{u2, succ u1} β α (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (RingHom.{u1, u2} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u1, u2} α β rα rβ)))) f)) (Singleton.singleton.{u2, u2} β (Set.{u2} β) (Set.instSingletonSet.{u2} β) (OfNat.ofNat.{u2} β 0 (Zero.toOfNat0.{u2} β (MulZeroOneClass.toZero.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β rβ))))))
+  forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ), Iff (Eq.{succ u2} β (OfNat.ofNat.{u2} β 0 (Zero.toOfNat0.{u2} β (MulZeroOneClass.toZero.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β rβ)))) (OfNat.ofNat.{u2} β 1 (One.toOfNat1.{u2} β (NonAssocSemiring.toOne.{u2} β rβ)))) (Eq.{succ u2} (Set.{u2} β) (Set.range.{u2, succ u1} β α (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (RingHom.{u1, u2} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u1, u2} α β rα rβ)))) f)) (Singleton.singleton.{u2, u2} β (Set.{u2} β) (Set.instSingletonSet.{u2} β) (OfNat.ofNat.{u2} β 0 (Zero.toOfNat0.{u2} β (MulZeroOneClass.toZero.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β rβ))))))
 Case conversion may be inaccurate. Consider using '#align ring_hom.codomain_trivial_iff_range_eq_singleton_zero RingHom.codomain_trivial_iff_range_eq_singleton_zeroₓ'. -/
 /-- `f : α →+* β` has a trivial codomain iff its range is `{0}`. -/
 theorem codomain_trivial_iff_range_eq_singleton_zero : (0 : β) = 1 ↔ Set.range f = {0} :=
@@ -1052,7 +1052,7 @@ theorem codomain_trivial_iff_range_eq_singleton_zero : (0 : β) = 1 ↔ Set.rang
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ) [_inst_1 : Nontrivial.{u2} β], Ne.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f (OfNat.ofNat.{u1} α 1 (OfNat.mk.{u1} α 1 (One.one.{u1} α (AddMonoidWithOne.toOne.{u1} α (AddCommMonoidWithOne.toAddMonoidWithOne.{u1} α (NonAssocSemiring.toAddCommMonoidWithOne.{u1} α rα))))))) (OfNat.ofNat.{u2} β 0 (OfNat.mk.{u2} β 0 (Zero.zero.{u2} β (MulZeroClass.toHasZero.{u2} β (NonUnitalNonAssocSemiring.toMulZeroClass.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ))))))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ) [_inst_1 : Nontrivial.{u2} β], Ne.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (RingHom.{u1, u2} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u1, u2} α β rα rβ)))) f (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) (OfNat.ofNat.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) 0 (Zero.toOfNat0.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) (MulZeroOneClass.toZero.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) (NonAssocSemiring.toMulZeroOneClass.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) rβ))))
+  forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u2} β} (f : RingHom.{u1, u2} α β rα rβ) [_inst_1 : Nontrivial.{u2} β], Ne.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (RingHom.{u1, u2} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u2} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u1, u2} α β rα rβ)))) f (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) (OfNat.ofNat.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) 0 (Zero.toOfNat0.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) (MulZeroOneClass.toZero.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) (NonAssocSemiring.toMulZeroOneClass.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (OfNat.ofNat.{u1} α 1 (One.toOfNat1.{u1} α (NonAssocSemiring.toOne.{u1} α rα)))) rβ))))
 Case conversion may be inaccurate. Consider using '#align ring_hom.map_one_ne_zero RingHom.map_one_ne_zeroₓ'. -/
 /-- `f : α →+* β` doesn't map `1` to `0` if `β` is nontrivial -/
 theorem map_one_ne_zero [Nontrivial β] : f 1 ≠ 0 :=
@@ -1083,7 +1083,7 @@ end
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} [_inst_1 : NonAssocRing.{u1} α] [_inst_2 : NonAssocRing.{u2} β] (f : RingHom.{u1, u2} α β (NonAssocRing.toNonAssocSemiring.{u1} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)) (x : α), Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β (NonAssocRing.toNonAssocSemiring.{u1} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)) (fun (_x : RingHom.{u1, u2} α β (NonAssocRing.toNonAssocSemiring.{u1} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β (NonAssocRing.toNonAssocSemiring.{u1} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)) f (Neg.neg.{u1} α (SubNegMonoid.toHasNeg.{u1} α (AddGroup.toSubNegMonoid.{u1} α (AddGroupWithOne.toAddGroup.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (NonAssocRing.toAddCommGroupWithOne.{u1} α _inst_1))))) x)) (Neg.neg.{u2} β (SubNegMonoid.toHasNeg.{u2} β (AddGroup.toSubNegMonoid.{u2} β (AddGroupWithOne.toAddGroup.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (NonAssocRing.toAddCommGroupWithOne.{u2} β _inst_2))))) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β (NonAssocRing.toNonAssocSemiring.{u1} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)) (fun (_x : RingHom.{u1, u2} α β (NonAssocRing.toNonAssocSemiring.{u1} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β (NonAssocRing.toNonAssocSemiring.{u1} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)) f x))
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} [_inst_1 : NonAssocRing.{u2} α] [_inst_2 : NonAssocRing.{u1} β] (f : RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) (x : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (Neg.neg.{u2} α (AddGroupWithOne.toNeg.{u2} α (AddCommGroupWithOne.toAddGroupWithOne.{u2} α (NonAssocRing.toAddCommGroupWithOne.{u2} α _inst_1))) x)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1)) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2) (RingHom.instRingHomClassRingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2))))) f (Neg.neg.{u2} α (AddGroupWithOne.toNeg.{u2} α (AddCommGroupWithOne.toAddGroupWithOne.{u2} α (NonAssocRing.toAddCommGroupWithOne.{u2} α _inst_1))) x)) (Neg.neg.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) (AddGroupWithOne.toNeg.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) (AddCommGroupWithOne.toAddGroupWithOne.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) (NonAssocRing.toAddCommGroupWithOne.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) _inst_2))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1)) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2) (RingHom.instRingHomClassRingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2))))) f x))
+  forall {α : Type.{u2}} {β : Type.{u1}} [_inst_1 : NonAssocRing.{u2} α] [_inst_2 : NonAssocRing.{u1} β] (f : RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) (x : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (Neg.neg.{u2} α (AddGroupWithOne.toNeg.{u2} α (AddCommGroupWithOne.toAddGroupWithOne.{u2} α (NonAssocRing.toAddCommGroupWithOne.{u2} α _inst_1))) x)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1)) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2) (RingHom.instRingHomClassRingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2))))) f (Neg.neg.{u2} α (AddGroupWithOne.toNeg.{u2} α (AddCommGroupWithOne.toAddGroupWithOne.{u2} α (NonAssocRing.toAddCommGroupWithOne.{u2} α _inst_1))) x)) (Neg.neg.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) (AddGroupWithOne.toNeg.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) (AddCommGroupWithOne.toAddGroupWithOne.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) (NonAssocRing.toAddCommGroupWithOne.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) _inst_2))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1)) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2) (RingHom.instRingHomClassRingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2))))) f x))
 Case conversion may be inaccurate. Consider using '#align ring_hom.map_neg RingHom.map_negₓ'. -/
 /-- Ring homomorphisms preserve additive inverse. -/
 protected theorem map_neg [NonAssocRing α] [NonAssocRing β] (f : α →+* β) (x : α) : f (-x) = -f x :=
@@ -1094,7 +1094,7 @@ protected theorem map_neg [NonAssocRing α] [NonAssocRing β] (f : α →+* β)
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} [_inst_1 : NonAssocRing.{u1} α] [_inst_2 : NonAssocRing.{u2} β] (f : RingHom.{u1, u2} α β (NonAssocRing.toNonAssocSemiring.{u1} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)) (x : α) (y : α), Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β (NonAssocRing.toNonAssocSemiring.{u1} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)) (fun (_x : RingHom.{u1, u2} α β (NonAssocRing.toNonAssocSemiring.{u1} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β (NonAssocRing.toNonAssocSemiring.{u1} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)) f (HSub.hSub.{u1, u1, u1} α α α (instHSub.{u1} α (SubNegMonoid.toHasSub.{u1} α (AddGroup.toSubNegMonoid.{u1} α (AddGroupWithOne.toAddGroup.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (NonAssocRing.toAddCommGroupWithOne.{u1} α _inst_1)))))) x y)) (HSub.hSub.{u2, u2, u2} β β β (instHSub.{u2} β (SubNegMonoid.toHasSub.{u2} β (AddGroup.toSubNegMonoid.{u2} β (AddGroupWithOne.toAddGroup.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (NonAssocRing.toAddCommGroupWithOne.{u2} β _inst_2)))))) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β (NonAssocRing.toNonAssocSemiring.{u1} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)) (fun (_x : RingHom.{u1, u2} α β (NonAssocRing.toNonAssocSemiring.{u1} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β (NonAssocRing.toNonAssocSemiring.{u1} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)) f x) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β (NonAssocRing.toNonAssocSemiring.{u1} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)) (fun (_x : RingHom.{u1, u2} α β (NonAssocRing.toNonAssocSemiring.{u1} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β (NonAssocRing.toNonAssocSemiring.{u1} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)) f y))
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} [_inst_1 : NonAssocRing.{u2} α] [_inst_2 : NonAssocRing.{u1} β] (f : RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) (x : α) (y : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (HSub.hSub.{u2, u2, u2} α α α (instHSub.{u2} α (AddGroupWithOne.toSub.{u2} α (AddCommGroupWithOne.toAddGroupWithOne.{u2} α (NonAssocRing.toAddCommGroupWithOne.{u2} α _inst_1)))) x y)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1)) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2) (RingHom.instRingHomClassRingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2))))) f (HSub.hSub.{u2, u2, u2} α α α (instHSub.{u2} α (AddGroupWithOne.toSub.{u2} α (AddCommGroupWithOne.toAddGroupWithOne.{u2} α (NonAssocRing.toAddCommGroupWithOne.{u2} α _inst_1)))) x y)) (HSub.hSub.{u1, u1, u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) y) ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) (instHSub.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) (AddGroupWithOne.toSub.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) (AddCommGroupWithOne.toAddGroupWithOne.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) (NonAssocRing.toAddCommGroupWithOne.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) _inst_2)))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1)) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2) (RingHom.instRingHomClassRingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2))))) f x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1)) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2) (RingHom.instRingHomClassRingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2))))) f y))
+  forall {α : Type.{u2}} {β : Type.{u1}} [_inst_1 : NonAssocRing.{u2} α] [_inst_2 : NonAssocRing.{u1} β] (f : RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) (x : α) (y : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (HSub.hSub.{u2, u2, u2} α α α (instHSub.{u2} α (AddGroupWithOne.toSub.{u2} α (AddCommGroupWithOne.toAddGroupWithOne.{u2} α (NonAssocRing.toAddCommGroupWithOne.{u2} α _inst_1)))) x y)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1)) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2) (RingHom.instRingHomClassRingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2))))) f (HSub.hSub.{u2, u2, u2} α α α (instHSub.{u2} α (AddGroupWithOne.toSub.{u2} α (AddCommGroupWithOne.toAddGroupWithOne.{u2} α (NonAssocRing.toAddCommGroupWithOne.{u2} α _inst_1)))) x y)) (HSub.hSub.{u1, u1, u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) y) ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) (instHSub.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) (AddGroupWithOne.toSub.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) (AddCommGroupWithOne.toAddGroupWithOne.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) (NonAssocRing.toAddCommGroupWithOne.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) x) _inst_2)))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1)) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2) (RingHom.instRingHomClassRingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2))))) f x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1)) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2) (RingHom.instRingHomClassRingHom.{u2, u1} α β (NonAssocRing.toNonAssocSemiring.{u2} α _inst_1) (NonAssocRing.toNonAssocSemiring.{u1} β _inst_2))))) f y))
 Case conversion may be inaccurate. Consider using '#align ring_hom.map_sub RingHom.map_subₓ'. -/
 /-- Ring homomorphisms preserve subtraction. -/
 protected theorem map_sub [NonAssocRing α] [NonAssocRing β] (f : α →+* β) (x y : α) :
@@ -1106,7 +1106,7 @@ protected theorem map_sub [NonAssocRing α] [NonAssocRing β] (f : α →+* β)
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} [_inst_1 : NonAssocSemiring.{u1} α] [_inst_2 : NonAssocRing.{u2} β] (f : MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))), (forall (a : α) (b : α), Eq.{succ u2} β (coeFn.{max (succ u2) (succ u1), max (succ u1) (succ u2)} (MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) (fun (_x : MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) => α -> β) (MonoidHom.hasCoeToFun.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) f (HAdd.hAdd.{u1, u1, u1} α α α (instHAdd.{u1} α (Distrib.toHasAdd.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α _inst_1)))) a b)) (HAdd.hAdd.{u2, u2, u2} β β β (instHAdd.{u2} β (Distrib.toHasAdd.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} β (NonAssocRing.toNonUnitalNonAssocRing.{u2} β _inst_2))))) (coeFn.{max (succ u2) (succ u1), max (succ u1) (succ u2)} (MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) (fun (_x : MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) => α -> β) (MonoidHom.hasCoeToFun.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) f a) (coeFn.{max (succ u2) (succ u1), max (succ u1) (succ u2)} (MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) (fun (_x : MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) => α -> β) (MonoidHom.hasCoeToFun.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) f b))) -> (RingHom.{u1, u2} α β _inst_1 (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u2}} [_inst_1 : NonAssocSemiring.{u1} α] [_inst_2 : NonAssocRing.{u2} β] (f : MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))), (forall (a : α) (b : α), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) (HAdd.hAdd.{u1, u1, u1} α α α (instHAdd.{u1} α (Distrib.toAdd.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α _inst_1)))) a b)) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) α β (MulOneClass.toMul.{u1} α (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1))) (MulOneClass.toMul.{u2} β (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) (MonoidHomClass.toMulHomClass.{max u1 u2, u1, u2} (MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2))) (MonoidHom.monoidHomClass.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))))) f (HAdd.hAdd.{u1, u1, u1} α α α (instHAdd.{u1} α (Distrib.toAdd.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α _inst_1)))) a b)) (HAdd.hAdd.{u2, u2, u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) b) ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (instHAdd.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (Distrib.toAdd.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (NonUnitalNonAssocSemiring.toDistrib.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (NonAssocRing.toNonUnitalNonAssocRing.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) _inst_2))))) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) α β (MulOneClass.toMul.{u1} α (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1))) (MulOneClass.toMul.{u2} β (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) (MonoidHomClass.toMulHomClass.{max u1 u2, u1, u2} (MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2))) (MonoidHom.monoidHomClass.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))))) f a) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) α β (MulOneClass.toMul.{u1} α (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1))) (MulOneClass.toMul.{u2} β (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) (MonoidHomClass.toMulHomClass.{max u1 u2, u1, u2} (MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2))) (MonoidHom.monoidHomClass.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))))) f b))) -> (RingHom.{u1, u2} α β _inst_1 (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2))
+  forall {α : Type.{u1}} {β : Type.{u2}} [_inst_1 : NonAssocSemiring.{u1} α] [_inst_2 : NonAssocRing.{u2} β] (f : MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))), (forall (a : α) (b : α), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) (HAdd.hAdd.{u1, u1, u1} α α α (instHAdd.{u1} α (Distrib.toAdd.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α _inst_1)))) a b)) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) α β (MulOneClass.toMul.{u1} α (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1))) (MulOneClass.toMul.{u2} β (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) (MonoidHomClass.toMulHomClass.{max u1 u2, u1, u2} (MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2))) (MonoidHom.monoidHomClass.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))))) f (HAdd.hAdd.{u1, u1, u1} α α α (instHAdd.{u1} α (Distrib.toAdd.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α _inst_1)))) a b)) (HAdd.hAdd.{u2, u2, u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) b) ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (instHAdd.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (Distrib.toAdd.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (NonUnitalNonAssocSemiring.toDistrib.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (NonAssocRing.toNonUnitalNonAssocRing.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) _inst_2))))) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) α β (MulOneClass.toMul.{u1} α (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1))) (MulOneClass.toMul.{u2} β (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) (MonoidHomClass.toMulHomClass.{max u1 u2, u1, u2} (MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2))) (MonoidHom.monoidHomClass.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))))) f a) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) α β (MulOneClass.toMul.{u1} α (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1))) (MulOneClass.toMul.{u2} β (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) (MonoidHomClass.toMulHomClass.{max u1 u2, u1, u2} (MonoidHom.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))) α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2))) (MonoidHom.monoidHomClass.{u1, u2} α β (MulZeroOneClass.toMulOneClass.{u1} α (NonAssocSemiring.toMulZeroOneClass.{u1} α _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} β (NonAssocSemiring.toMulZeroOneClass.{u2} β (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2)))))) f b))) -> (RingHom.{u1, u2} α β _inst_1 (NonAssocRing.toNonAssocSemiring.{u2} β _inst_2))
 Case conversion may be inaccurate. Consider using '#align ring_hom.mk' RingHom.mk'ₓ'. -/
 /-- Makes a ring homomorphism from a monoid homomorphism of rings which preserves addition. -/
 def mk' [NonAssocSemiring α] [NonAssocRing β] (f : α →* β)
@@ -1122,7 +1122,7 @@ variable [Semiring α] [Semiring β]
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} [_inst_1 : Semiring.{u1} α] [_inst_2 : Semiring.{u2} β] (f : RingHom.{u1, u2} α β (Semiring.toNonAssocSemiring.{u1} α _inst_1) (Semiring.toNonAssocSemiring.{u2} β _inst_2)) {a : α}, (IsUnit.{u1} α (MonoidWithZero.toMonoid.{u1} α (Semiring.toMonoidWithZero.{u1} α _inst_1)) a) -> (IsUnit.{u2} β (MonoidWithZero.toMonoid.{u2} β (Semiring.toMonoidWithZero.{u2} β _inst_2)) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β (Semiring.toNonAssocSemiring.{u1} α _inst_1) (Semiring.toNonAssocSemiring.{u2} β _inst_2)) (fun (_x : RingHom.{u1, u2} α β (Semiring.toNonAssocSemiring.{u1} α _inst_1) (Semiring.toNonAssocSemiring.{u2} β _inst_2)) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β (Semiring.toNonAssocSemiring.{u1} α _inst_1) (Semiring.toNonAssocSemiring.{u2} β _inst_2)) f a))
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} [_inst_1 : Semiring.{u2} α] [_inst_2 : Semiring.{u1} β] (f : RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) {a : α}, (IsUnit.{u2} α (MonoidWithZero.toMonoid.{u2} α (Semiring.toMonoidWithZero.{u2} α _inst_1)) a) -> (IsUnit.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MonoidWithZero.toMonoid.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (Semiring.toMonoidWithZero.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) _inst_2)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (Semiring.toNonAssocSemiring.{u2} α _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (Semiring.toNonAssocSemiring.{u1} β _inst_2))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (Semiring.toNonAssocSemiring.{u2} α _inst_1)) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (Semiring.toNonAssocSemiring.{u1} β _inst_2)) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2) (RingHom.instRingHomClassRingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2))))) f a))
+  forall {α : Type.{u2}} {β : Type.{u1}} [_inst_1 : Semiring.{u2} α] [_inst_2 : Semiring.{u1} β] (f : RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) {a : α}, (IsUnit.{u2} α (MonoidWithZero.toMonoid.{u2} α (Semiring.toMonoidWithZero.{u2} α _inst_1)) a) -> (IsUnit.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (MonoidWithZero.toMonoid.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (Semiring.toMonoidWithZero.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) _inst_2)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (Semiring.toNonAssocSemiring.{u2} α _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (Semiring.toNonAssocSemiring.{u1} β _inst_2))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (Semiring.toNonAssocSemiring.{u2} α _inst_1)) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (Semiring.toNonAssocSemiring.{u1} β _inst_2)) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2) (RingHom.instRingHomClassRingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2))))) f a))
 Case conversion may be inaccurate. Consider using '#align ring_hom.is_unit_map RingHom.isUnit_mapₓ'. -/
 theorem isUnit_map (f : α →+* β) {a : α} : IsUnit a → IsUnit (f a) :=
   IsUnit.map f
@@ -1132,7 +1132,7 @@ theorem isUnit_map (f : α →+* β) {a : α} : IsUnit a → IsUnit (f a) :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} [_inst_1 : Semiring.{u1} α] [_inst_2 : Semiring.{u2} β] (f : RingHom.{u1, u2} α β (Semiring.toNonAssocSemiring.{u1} α _inst_1) (Semiring.toNonAssocSemiring.{u2} β _inst_2)) {a : α} {b : α}, (Dvd.Dvd.{u1} α (semigroupDvd.{u1} α (SemigroupWithZero.toSemigroup.{u1} α (NonUnitalSemiring.toSemigroupWithZero.{u1} α (Semiring.toNonUnitalSemiring.{u1} α _inst_1)))) a b) -> (Dvd.Dvd.{u2} β (semigroupDvd.{u2} β (SemigroupWithZero.toSemigroup.{u2} β (NonUnitalSemiring.toSemigroupWithZero.{u2} β (Semiring.toNonUnitalSemiring.{u2} β _inst_2)))) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β (Semiring.toNonAssocSemiring.{u1} α _inst_1) (Semiring.toNonAssocSemiring.{u2} β _inst_2)) (fun (_x : RingHom.{u1, u2} α β (Semiring.toNonAssocSemiring.{u1} α _inst_1) (Semiring.toNonAssocSemiring.{u2} β _inst_2)) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β (Semiring.toNonAssocSemiring.{u1} α _inst_1) (Semiring.toNonAssocSemiring.{u2} β _inst_2)) f a) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β (Semiring.toNonAssocSemiring.{u1} α _inst_1) (Semiring.toNonAssocSemiring.{u2} β _inst_2)) (fun (_x : RingHom.{u1, u2} α β (Semiring.toNonAssocSemiring.{u1} α _inst_1) (Semiring.toNonAssocSemiring.{u2} β _inst_2)) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β (Semiring.toNonAssocSemiring.{u1} α _inst_1) (Semiring.toNonAssocSemiring.{u2} β _inst_2)) f b))
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} [_inst_1 : Semiring.{u2} α] [_inst_2 : Semiring.{u1} β] (f : RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) {a : α} {b : α}, (Dvd.dvd.{u2} α (semigroupDvd.{u2} α (SemigroupWithZero.toSemigroup.{u2} α (NonUnitalSemiring.toSemigroupWithZero.{u2} α (Semiring.toNonUnitalSemiring.{u2} α _inst_1)))) a b) -> (Dvd.dvd.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (semigroupDvd.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (SemigroupWithZero.toSemigroup.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (NonUnitalSemiring.toSemigroupWithZero.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (Semiring.toNonUnitalSemiring.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) _inst_2)))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (Semiring.toNonAssocSemiring.{u2} α _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (Semiring.toNonAssocSemiring.{u1} β _inst_2))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (Semiring.toNonAssocSemiring.{u2} α _inst_1)) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (Semiring.toNonAssocSemiring.{u1} β _inst_2)) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2) (RingHom.instRingHomClassRingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2))))) f a) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (Semiring.toNonAssocSemiring.{u2} α _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (Semiring.toNonAssocSemiring.{u1} β _inst_2))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (Semiring.toNonAssocSemiring.{u2} α _inst_1)) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (Semiring.toNonAssocSemiring.{u1} β _inst_2)) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2) (RingHom.instRingHomClassRingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2))))) f b))
+  forall {α : Type.{u2}} {β : Type.{u1}} [_inst_1 : Semiring.{u2} α] [_inst_2 : Semiring.{u1} β] (f : RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) {a : α} {b : α}, (Dvd.dvd.{u2} α (semigroupDvd.{u2} α (SemigroupWithZero.toSemigroup.{u2} α (NonUnitalSemiring.toSemigroupWithZero.{u2} α (Semiring.toNonUnitalSemiring.{u2} α _inst_1)))) a b) -> (Dvd.dvd.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (semigroupDvd.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (SemigroupWithZero.toSemigroup.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (NonUnitalSemiring.toSemigroupWithZero.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) (Semiring.toNonUnitalSemiring.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) a) _inst_2)))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (Semiring.toNonAssocSemiring.{u2} α _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (Semiring.toNonAssocSemiring.{u1} β _inst_2))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (Semiring.toNonAssocSemiring.{u2} α _inst_1)) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (Semiring.toNonAssocSemiring.{u1} β _inst_2)) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2) (RingHom.instRingHomClassRingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2))))) f a) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α β (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (Semiring.toNonAssocSemiring.{u2} α _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (Semiring.toNonAssocSemiring.{u1} β _inst_2))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (Semiring.toNonAssocSemiring.{u2} α _inst_1)) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (Semiring.toNonAssocSemiring.{u1} β _inst_2)) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2)) α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2) (RingHom.instRingHomClassRingHom.{u2, u1} α β (Semiring.toNonAssocSemiring.{u2} α _inst_1) (Semiring.toNonAssocSemiring.{u1} β _inst_2))))) f b))
 Case conversion may be inaccurate. Consider using '#align ring_hom.map_dvd RingHom.map_dvdₓ'. -/
 protected theorem map_dvd (f : α →+* β) {a b : α} : a ∣ b → f a ∣ f b :=
   map_dvd f
@@ -1156,7 +1156,7 @@ instance : Inhabited (α →+* α) :=
 lean 3 declaration is
   forall {α : Type.{u1}} [rα : NonAssocSemiring.{u1} α] (x : α), Eq.{succ u1} α (coeFn.{succ u1, succ u1} (RingHom.{u1, u1} α α rα rα) (fun (_x : RingHom.{u1, u1} α α rα rα) => α -> α) (RingHom.hasCoeToFun.{u1, u1} α α rα rα) (RingHom.id.{u1} α rα) x) x
 but is expected to have type
-  forall {α : Type.{u1}} {rα : NonAssocSemiring.{u1} α} (x : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => α) x) (FunLike.coe.{succ u1, succ u1, succ u1} (RingHom.{u1, u1} α α rα rα) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => α) _x) (MulHomClass.toFunLike.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalRingHomClass.toMulHomClass.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (RingHomClass.toNonUnitalRingHomClass.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α rα rα (RingHom.instRingHomClassRingHom.{u1, u1} α α rα rα)))) (RingHom.id.{u1} α rα) x) x
+  forall {α : Type.{u1}} {rα : NonAssocSemiring.{u1} α} (x : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => α) x) (FunLike.coe.{succ u1, succ u1, succ u1} (RingHom.{u1, u1} α α rα rα) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => α) _x) (MulHomClass.toFunLike.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalRingHomClass.toMulHomClass.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (RingHomClass.toNonUnitalRingHomClass.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α rα rα (RingHom.instRingHomClassRingHom.{u1, u1} α α rα rα)))) (RingHom.id.{u1} α rα) x) x
 Case conversion may be inaccurate. Consider using '#align ring_hom.id_apply RingHom.id_applyₓ'. -/
 @[simp]
 theorem id_apply (x : α) : RingHom.id α x = x :=
@@ -1215,7 +1215,7 @@ theorem comp_assoc {δ} {rδ : NonAssocSemiring δ} (f : α →+* β) (g : β 
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {γ : Type.{u3}} [rα : NonAssocSemiring.{u1} α] [rβ : NonAssocSemiring.{u2} β] {rγ : NonAssocSemiring.{u3} γ} (hnp : RingHom.{u2, u3} β γ rβ rγ) (hmn : RingHom.{u1, u2} α β rα rβ), Eq.{max (succ u1) (succ u3)} ((fun (_x : RingHom.{u1, u3} α γ rα rγ) => α -> γ) (RingHom.comp.{u1, u2, u3} α β γ rα rβ rγ hnp hmn)) (coeFn.{max (succ u1) (succ u3), max (succ u1) (succ u3)} (RingHom.{u1, u3} α γ rα rγ) (fun (_x : RingHom.{u1, u3} α γ rα rγ) => α -> γ) (RingHom.hasCoeToFun.{u1, u3} α γ rα rγ) (RingHom.comp.{u1, u2, u3} α β γ rα rβ rγ hnp hmn)) (Function.comp.{succ u1, succ u2, succ u3} α β γ (coeFn.{max (succ u2) (succ u3), max (succ u2) (succ u3)} (RingHom.{u2, u3} β γ rβ rγ) (fun (_x : RingHom.{u2, u3} β γ rβ rγ) => β -> γ) (RingHom.hasCoeToFun.{u2, u3} β γ rβ rγ) hnp) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) hmn))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u3} β} {rγ : NonAssocSemiring.{u2} γ} (hnp : RingHom.{u3, u2} β γ rβ rγ) (hmn : RingHom.{u1, u3} α β rα rβ), Eq.{max (succ u1) (succ u2)} (forall (a : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => γ) a) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (RingHom.{u1, u2} α γ rα rγ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => γ) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (RingHom.{u1, u2} α γ rα rγ) α γ (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u2} γ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} γ rγ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α γ rα rγ) α γ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} γ rγ) (RingHomClass.toNonUnitalRingHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α γ rα rγ) α γ rα rγ (RingHom.instRingHomClassRingHom.{u1, u2} α γ rα rγ)))) (RingHom.comp.{u1, u3, u2} α β γ rα rβ rγ hnp hmn)) (Function.comp.{succ u1, succ u3, succ u2} α β γ (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (RingHom.{u3, u2} β γ rβ rγ) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : β) => γ) _x) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (RingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ)) (NonUnitalNonAssocSemiring.toMul.{u2} γ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} γ rγ)) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (RingHom.{u3, u2} β γ rβ rγ) β γ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} γ rγ) (RingHomClass.toNonUnitalRingHomClass.{max u3 u2, u3, u2} (RingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (RingHom.instRingHomClassRingHom.{u3, u2} β γ rβ rγ)))) hnp) (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (RingHom.{u1, u3} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (RingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u3} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (RingHom.{u1, u3} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u1 u3, u1, u3} (RingHom.{u1, u3} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u1, u3} α β rα rβ)))) hmn))
+  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u3} β} {rγ : NonAssocSemiring.{u2} γ} (hnp : RingHom.{u3, u2} β γ rβ rγ) (hmn : RingHom.{u1, u3} α β rα rβ), Eq.{max (succ u1) (succ u2)} (forall (a : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => γ) a) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (RingHom.{u1, u2} α γ rα rγ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => γ) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (RingHom.{u1, u2} α γ rα rγ) α γ (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u2} γ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} γ rγ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α γ rα rγ) α γ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} γ rγ) (RingHomClass.toNonUnitalRingHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α γ rα rγ) α γ rα rγ (RingHom.instRingHomClassRingHom.{u1, u2} α γ rα rγ)))) (RingHom.comp.{u1, u3, u2} α β γ rα rβ rγ hnp hmn)) (Function.comp.{succ u1, succ u3, succ u2} α β γ (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (RingHom.{u3, u2} β γ rβ rγ) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : β) => γ) _x) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (RingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ)) (NonUnitalNonAssocSemiring.toMul.{u2} γ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} γ rγ)) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (RingHom.{u3, u2} β γ rβ rγ) β γ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} γ rγ) (RingHomClass.toNonUnitalRingHomClass.{max u3 u2, u3, u2} (RingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (RingHom.instRingHomClassRingHom.{u3, u2} β γ rβ rγ)))) hnp) (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (RingHom.{u1, u3} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (RingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u3} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (RingHom.{u1, u3} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u1 u3, u1, u3} (RingHom.{u1, u3} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u1, u3} α β rα rβ)))) hmn))
 Case conversion may be inaccurate. Consider using '#align ring_hom.coe_comp RingHom.coe_compₓ'. -/
 @[simp]
 theorem coe_comp (hnp : β →+* γ) (hmn : α →+* β) : (hnp.comp hmn : α → γ) = hnp ∘ hmn :=
@@ -1226,7 +1226,7 @@ theorem coe_comp (hnp : β →+* γ) (hmn : α →+* β) : (hnp.comp hmn : α 
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {γ : Type.{u3}} [rα : NonAssocSemiring.{u1} α] [rβ : NonAssocSemiring.{u2} β] {rγ : NonAssocSemiring.{u3} γ} (hnp : RingHom.{u2, u3} β γ rβ rγ) (hmn : RingHom.{u1, u2} α β rα rβ) (x : α), Eq.{succ u3} γ (coeFn.{max (succ u1) (succ u3), max (succ u1) (succ u3)} (RingHom.{u1, u3} α γ rα rγ) (fun (_x : RingHom.{u1, u3} α γ rα rγ) => α -> γ) (RingHom.hasCoeToFun.{u1, u3} α γ rα rγ) (RingHom.comp.{u1, u2, u3} α β γ rα rβ rγ hnp hmn) x) (coeFn.{max (succ u2) (succ u3), max (succ u2) (succ u3)} (RingHom.{u2, u3} β γ rβ rγ) (fun (_x : RingHom.{u2, u3} β γ rβ rγ) => β -> γ) (RingHom.hasCoeToFun.{u2, u3} β γ rβ rγ) hnp (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) hmn x))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u3} β} {rγ : NonAssocSemiring.{u2} γ} (hnp : RingHom.{u3, u2} β γ rβ rγ) (hmn : RingHom.{u1, u3} α β rα rβ) (x : α), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => γ) x) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (RingHom.{u1, u2} α γ rα rγ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => γ) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (RingHom.{u1, u2} α γ rα rγ) α γ (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u2} γ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} γ rγ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α γ rα rγ) α γ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} γ rγ) (RingHomClass.toNonUnitalRingHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α γ rα rγ) α γ rα rγ (RingHom.instRingHomClassRingHom.{u1, u2} α γ rα rγ)))) (RingHom.comp.{u1, u3, u2} α β γ rα rβ rγ hnp hmn) x) (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (RingHom.{u3, u2} β γ rβ rγ) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : β) => γ) _x) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (RingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ)) (NonUnitalNonAssocSemiring.toMul.{u2} γ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} γ rγ)) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (RingHom.{u3, u2} β γ rβ rγ) β γ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} γ rγ) (RingHomClass.toNonUnitalRingHomClass.{max u3 u2, u3, u2} (RingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (RingHom.instRingHomClassRingHom.{u3, u2} β γ rβ rγ)))) hnp (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (RingHom.{u1, u3} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (RingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u3} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (RingHom.{u1, u3} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u1 u3, u1, u3} (RingHom.{u1, u3} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u1, u3} α β rα rβ)))) hmn x))
+  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u3} β} {rγ : NonAssocSemiring.{u2} γ} (hnp : RingHom.{u3, u2} β γ rβ rγ) (hmn : RingHom.{u1, u3} α β rα rβ) (x : α), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => γ) x) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (RingHom.{u1, u2} α γ rα rγ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => γ) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (RingHom.{u1, u2} α γ rα rγ) α γ (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u2} γ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} γ rγ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α γ rα rγ) α γ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} γ rγ) (RingHomClass.toNonUnitalRingHomClass.{max u1 u2, u1, u2} (RingHom.{u1, u2} α γ rα rγ) α γ rα rγ (RingHom.instRingHomClassRingHom.{u1, u2} α γ rα rγ)))) (RingHom.comp.{u1, u3, u2} α β γ rα rβ rγ hnp hmn) x) (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (RingHom.{u3, u2} β γ rβ rγ) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : β) => γ) _x) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (RingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ)) (NonUnitalNonAssocSemiring.toMul.{u2} γ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} γ rγ)) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (RingHom.{u3, u2} β γ rβ rγ) β γ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} γ rγ) (RingHomClass.toNonUnitalRingHomClass.{max u3 u2, u3, u2} (RingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (RingHom.instRingHomClassRingHom.{u3, u2} β γ rβ rγ)))) hnp (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (RingHom.{u1, u3} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (RingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u3} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (RingHom.{u1, u3} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u1 u3, u1, u3} (RingHom.{u1, u3} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u1, u3} α β rα rβ)))) hmn x))
 Case conversion may be inaccurate. Consider using '#align ring_hom.comp_apply RingHom.comp_applyₓ'. -/
 theorem comp_apply (hnp : β →+* γ) (hmn : α →+* β) (x : α) :
     (hnp.comp hmn : α → γ) x = hnp (hmn x) :=
@@ -1290,7 +1290,7 @@ theorem mul_def (f g : α →+* α) : f * g = f.comp g :=
 lean 3 declaration is
   forall {α : Type.{u1}} [rα : NonAssocSemiring.{u1} α], Eq.{succ u1} (α -> α) (coeFn.{succ u1, succ u1} (RingHom.{u1, u1} α α rα rα) (fun (_x : RingHom.{u1, u1} α α rα rα) => α -> α) (RingHom.hasCoeToFun.{u1, u1} α α rα rα) (OfNat.ofNat.{u1} (RingHom.{u1, u1} α α rα rα) 1 (OfNat.mk.{u1} (RingHom.{u1, u1} α α rα rα) 1 (One.one.{u1} (RingHom.{u1, u1} α α rα rα) (MulOneClass.toHasOne.{u1} (RingHom.{u1, u1} α α rα rα) (Monoid.toMulOneClass.{u1} (RingHom.{u1, u1} α α rα rα) (RingHom.monoid.{u1} α rα))))))) (id.{succ u1} α)
 but is expected to have type
-  forall {α : Type.{u1}} {rα : NonAssocSemiring.{u1} α}, Eq.{succ u1} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => α) ᾰ) (FunLike.coe.{succ u1, succ u1, succ u1} (RingHom.{u1, u1} α α rα rα) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => α) _x) (MulHomClass.toFunLike.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalRingHomClass.toMulHomClass.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (RingHomClass.toNonUnitalRingHomClass.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α rα rα (RingHom.instRingHomClassRingHom.{u1, u1} α α rα rα)))) (OfNat.ofNat.{u1} (RingHom.{u1, u1} α α rα rα) 1 (One.toOfNat1.{u1} (RingHom.{u1, u1} α α rα rα) (Monoid.toOne.{u1} (RingHom.{u1, u1} α α rα rα) (RingHom.instMonoidRingHom.{u1} α rα))))) (id.{succ u1} α)
+  forall {α : Type.{u1}} {rα : NonAssocSemiring.{u1} α}, Eq.{succ u1} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => α) ᾰ) (FunLike.coe.{succ u1, succ u1, succ u1} (RingHom.{u1, u1} α α rα rα) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => α) _x) (MulHomClass.toFunLike.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalRingHomClass.toMulHomClass.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (RingHomClass.toNonUnitalRingHomClass.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α rα rα (RingHom.instRingHomClassRingHom.{u1, u1} α α rα rα)))) (OfNat.ofNat.{u1} (RingHom.{u1, u1} α α rα rα) 1 (One.toOfNat1.{u1} (RingHom.{u1, u1} α α rα rα) (Monoid.toOne.{u1} (RingHom.{u1, u1} α α rα rα) (RingHom.instMonoidRingHom.{u1} α rα))))) (id.{succ u1} α)
 Case conversion may be inaccurate. Consider using '#align ring_hom.coe_one RingHom.coe_oneₓ'. -/
 @[simp]
 theorem coe_one : ⇑(1 : α →+* α) = id :=
@@ -1301,7 +1301,7 @@ theorem coe_one : ⇑(1 : α →+* α) = id :=
 lean 3 declaration is
   forall {α : Type.{u1}} [rα : NonAssocSemiring.{u1} α] (f : RingHom.{u1, u1} α α rα rα) (g : RingHom.{u1, u1} α α rα rα), Eq.{succ u1} (α -> α) (coeFn.{succ u1, succ u1} (RingHom.{u1, u1} α α rα rα) (fun (_x : RingHom.{u1, u1} α α rα rα) => α -> α) (RingHom.hasCoeToFun.{u1, u1} α α rα rα) (HMul.hMul.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) (RingHom.{u1, u1} α α rα rα) (RingHom.{u1, u1} α α rα rα) (instHMul.{u1} (RingHom.{u1, u1} α α rα rα) (MulOneClass.toHasMul.{u1} (RingHom.{u1, u1} α α rα rα) (Monoid.toMulOneClass.{u1} (RingHom.{u1, u1} α α rα rα) (RingHom.monoid.{u1} α rα)))) f g)) (Function.comp.{succ u1, succ u1, succ u1} α α α (coeFn.{succ u1, succ u1} (RingHom.{u1, u1} α α rα rα) (fun (_x : RingHom.{u1, u1} α α rα rα) => α -> α) (RingHom.hasCoeToFun.{u1, u1} α α rα rα) f) (coeFn.{succ u1, succ u1} (RingHom.{u1, u1} α α rα rα) (fun (_x : RingHom.{u1, u1} α α rα rα) => α -> α) (RingHom.hasCoeToFun.{u1, u1} α α rα rα) g))
 but is expected to have type
-  forall {α : Type.{u1}} {rα : NonAssocSemiring.{u1} α} (f : RingHom.{u1, u1} α α rα rα) (g : RingHom.{u1, u1} α α rα rα), Eq.{succ u1} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => α) ᾰ) (FunLike.coe.{succ u1, succ u1, succ u1} (RingHom.{u1, u1} α α rα rα) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => α) _x) (MulHomClass.toFunLike.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalRingHomClass.toMulHomClass.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (RingHomClass.toNonUnitalRingHomClass.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α rα rα (RingHom.instRingHomClassRingHom.{u1, u1} α α rα rα)))) (HMul.hMul.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) (RingHom.{u1, u1} α α rα rα) (RingHom.{u1, u1} α α rα rα) (instHMul.{u1} (RingHom.{u1, u1} α α rα rα) (MulOneClass.toMul.{u1} (RingHom.{u1, u1} α α rα rα) (Monoid.toMulOneClass.{u1} (RingHom.{u1, u1} α α rα rα) (RingHom.instMonoidRingHom.{u1} α rα)))) f g)) (Function.comp.{succ u1, succ u1, succ u1} α α α (FunLike.coe.{succ u1, succ u1, succ u1} (RingHom.{u1, u1} α α rα rα) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => α) _x) (MulHomClass.toFunLike.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalRingHomClass.toMulHomClass.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (RingHomClass.toNonUnitalRingHomClass.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α rα rα (RingHom.instRingHomClassRingHom.{u1, u1} α α rα rα)))) f) (FunLike.coe.{succ u1, succ u1, succ u1} (RingHom.{u1, u1} α α rα rα) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => α) _x) (MulHomClass.toFunLike.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalRingHomClass.toMulHomClass.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (RingHomClass.toNonUnitalRingHomClass.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α rα rα (RingHom.instRingHomClassRingHom.{u1, u1} α α rα rα)))) g))
+  forall {α : Type.{u1}} {rα : NonAssocSemiring.{u1} α} (f : RingHom.{u1, u1} α α rα rα) (g : RingHom.{u1, u1} α α rα rα), Eq.{succ u1} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => α) ᾰ) (FunLike.coe.{succ u1, succ u1, succ u1} (RingHom.{u1, u1} α α rα rα) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => α) _x) (MulHomClass.toFunLike.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalRingHomClass.toMulHomClass.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (RingHomClass.toNonUnitalRingHomClass.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α rα rα (RingHom.instRingHomClassRingHom.{u1, u1} α α rα rα)))) (HMul.hMul.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) (RingHom.{u1, u1} α α rα rα) (RingHom.{u1, u1} α α rα rα) (instHMul.{u1} (RingHom.{u1, u1} α α rα rα) (MulOneClass.toMul.{u1} (RingHom.{u1, u1} α α rα rα) (Monoid.toMulOneClass.{u1} (RingHom.{u1, u1} α α rα rα) (RingHom.instMonoidRingHom.{u1} α rα)))) f g)) (Function.comp.{succ u1, succ u1, succ u1} α α α (FunLike.coe.{succ u1, succ u1, succ u1} (RingHom.{u1, u1} α α rα rα) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => α) _x) (MulHomClass.toFunLike.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalRingHomClass.toMulHomClass.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (RingHomClass.toNonUnitalRingHomClass.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α rα rα (RingHom.instRingHomClassRingHom.{u1, u1} α α rα rα)))) f) (FunLike.coe.{succ u1, succ u1, succ u1} (RingHom.{u1, u1} α α rα rα) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => α) _x) (MulHomClass.toFunLike.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalRingHomClass.toMulHomClass.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (RingHomClass.toNonUnitalRingHomClass.{u1, u1, u1} (RingHom.{u1, u1} α α rα rα) α α rα rα (RingHom.instRingHomClassRingHom.{u1, u1} α α rα rα)))) g))
 Case conversion may be inaccurate. Consider using '#align ring_hom.coe_mul RingHom.coe_mulₓ'. -/
 @[simp]
 theorem coe_mul (f g : α →+* α) : ⇑(f * g) = f ∘ g :=
@@ -1314,7 +1314,7 @@ include rβ rγ
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {γ : Type.{u3}} [rα : NonAssocSemiring.{u1} α] [rβ : NonAssocSemiring.{u2} β] {rγ : NonAssocSemiring.{u3} γ} {g₁ : RingHom.{u2, u3} β γ rβ rγ} {g₂ : RingHom.{u2, u3} β γ rβ rγ} {f : RingHom.{u1, u2} α β rα rβ}, (Function.Surjective.{succ u1, succ u2} α β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) (fun (_x : RingHom.{u1, u2} α β rα rβ) => α -> β) (RingHom.hasCoeToFun.{u1, u2} α β rα rβ) f)) -> (Iff (Eq.{max (succ u1) (succ u3)} (RingHom.{u1, u3} α γ rα rγ) (RingHom.comp.{u1, u2, u3} α β γ rα rβ rγ g₁ f) (RingHom.comp.{u1, u2, u3} α β γ rα rβ rγ g₂ f)) (Eq.{max (succ u2) (succ u3)} (RingHom.{u2, u3} β γ rβ rγ) g₁ g₂))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u3} β} {rγ : NonAssocSemiring.{u2} γ} {g₁ : RingHom.{u3, u2} β γ rβ rγ} {g₂ : RingHom.{u3, u2} β γ rβ rγ} {f : RingHom.{u1, u3} α β rα rβ}, (Function.Surjective.{succ u1, succ u3} α β (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (RingHom.{u1, u3} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (RingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u3} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (RingHom.{u1, u3} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u1 u3, u1, u3} (RingHom.{u1, u3} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u1, u3} α β rα rβ)))) f)) -> (Iff (Eq.{max (succ u1) (succ u2)} (RingHom.{u1, u2} α γ rα rγ) (RingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g₁ f) (RingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g₂ f)) (Eq.{max (succ u3) (succ u2)} (RingHom.{u3, u2} β γ rβ rγ) g₁ g₂))
+  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u3} β} {rγ : NonAssocSemiring.{u2} γ} {g₁ : RingHom.{u3, u2} β γ rβ rγ} {g₂ : RingHom.{u3, u2} β γ rβ rγ} {f : RingHom.{u1, u3} α β rα rβ}, (Function.Surjective.{succ u1, succ u3} α β (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (RingHom.{u1, u3} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (RingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα)) (NonUnitalNonAssocSemiring.toMul.{u3} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (RingHom.{u1, u3} α β rα rβ) α β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} α rα) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ) (RingHomClass.toNonUnitalRingHomClass.{max u1 u3, u1, u3} (RingHom.{u1, u3} α β rα rβ) α β rα rβ (RingHom.instRingHomClassRingHom.{u1, u3} α β rα rβ)))) f)) -> (Iff (Eq.{max (succ u1) (succ u2)} (RingHom.{u1, u2} α γ rα rγ) (RingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g₁ f) (RingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g₂ f)) (Eq.{max (succ u3) (succ u2)} (RingHom.{u3, u2} β γ rβ rγ) g₁ g₂))
 Case conversion may be inaccurate. Consider using '#align ring_hom.cancel_right RingHom.cancel_rightₓ'. -/
 theorem cancel_right {g₁ g₂ : β →+* γ} {f : α →+* β} (hf : Surjective f) :
     g₁.comp f = g₂.comp f ↔ g₁ = g₂ :=
@@ -1325,7 +1325,7 @@ theorem cancel_right {g₁ g₂ : β →+* γ} {f : α →+* β} (hf : Surjectiv
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {γ : Type.{u3}} [rα : NonAssocSemiring.{u1} α] [rβ : NonAssocSemiring.{u2} β] {rγ : NonAssocSemiring.{u3} γ} {g : RingHom.{u2, u3} β γ rβ rγ} {f₁ : RingHom.{u1, u2} α β rα rβ} {f₂ : RingHom.{u1, u2} α β rα rβ}, (Function.Injective.{succ u2, succ u3} β γ (coeFn.{max (succ u2) (succ u3), max (succ u2) (succ u3)} (RingHom.{u2, u3} β γ rβ rγ) (fun (_x : RingHom.{u2, u3} β γ rβ rγ) => β -> γ) (RingHom.hasCoeToFun.{u2, u3} β γ rβ rγ) g)) -> (Iff (Eq.{max (succ u1) (succ u3)} (RingHom.{u1, u3} α γ rα rγ) (RingHom.comp.{u1, u2, u3} α β γ rα rβ rγ g f₁) (RingHom.comp.{u1, u2, u3} α β γ rα rβ rγ g f₂)) (Eq.{max (succ u1) (succ u2)} (RingHom.{u1, u2} α β rα rβ) f₁ f₂))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u3} β} {rγ : NonAssocSemiring.{u2} γ} {g : RingHom.{u3, u2} β γ rβ rγ} {f₁ : RingHom.{u1, u3} α β rα rβ} {f₂ : RingHom.{u1, u3} α β rα rβ}, (Function.Injective.{succ u3, succ u2} β γ (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (RingHom.{u3, u2} β γ rβ rγ) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : β) => γ) _x) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (RingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ)) (NonUnitalNonAssocSemiring.toMul.{u2} γ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} γ rγ)) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (RingHom.{u3, u2} β γ rβ rγ) β γ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} γ rγ) (RingHomClass.toNonUnitalRingHomClass.{max u3 u2, u3, u2} (RingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (RingHom.instRingHomClassRingHom.{u3, u2} β γ rβ rγ)))) g)) -> (Iff (Eq.{max (succ u1) (succ u2)} (RingHom.{u1, u2} α γ rα rγ) (RingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f₁) (RingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f₂)) (Eq.{max (succ u1) (succ u3)} (RingHom.{u1, u3} α β rα rβ) f₁ f₂))
+  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} {rα : NonAssocSemiring.{u1} α} {rβ : NonAssocSemiring.{u3} β} {rγ : NonAssocSemiring.{u2} γ} {g : RingHom.{u3, u2} β γ rβ rγ} {f₁ : RingHom.{u1, u3} α β rα rβ} {f₂ : RingHom.{u1, u3} α β rα rβ}, (Function.Injective.{succ u3, succ u2} β γ (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (RingHom.{u3, u2} β γ rβ rγ) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : β) => γ) _x) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (RingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ)) (NonUnitalNonAssocSemiring.toMul.{u2} γ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} γ rγ)) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (RingHom.{u3, u2} β γ rβ rγ) β γ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} β rβ) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} γ rγ) (RingHomClass.toNonUnitalRingHomClass.{max u3 u2, u3, u2} (RingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (RingHom.instRingHomClassRingHom.{u3, u2} β γ rβ rγ)))) g)) -> (Iff (Eq.{max (succ u1) (succ u2)} (RingHom.{u1, u2} α γ rα rγ) (RingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f₁) (RingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f₂)) (Eq.{max (succ u1) (succ u3)} (RingHom.{u1, u3} α β rα rβ) f₁ f₂))
 Case conversion may be inaccurate. Consider using '#align ring_hom.cancel_left RingHom.cancel_leftₓ'. -/
 theorem cancel_left {g : β →+* γ} {f₁ f₂ : α →+* β} (hg : Injective g) :
     g.comp f₁ = g.comp f₂ ↔ f₁ = f₂ :=
@@ -1338,7 +1338,7 @@ end RingHom
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} [_inst_1 : Ring.{u1} α] [_inst_2 : IsDomain.{u1} α (Ring.toSemiring.{u1} α _inst_1)] [_inst_3 : Ring.{u2} β] (f : RingHom.{u2, u1} β α (NonAssocRing.toNonAssocSemiring.{u2} β (Ring.toNonAssocRing.{u2} β _inst_3)) (NonAssocRing.toNonAssocSemiring.{u1} α (Ring.toNonAssocRing.{u1} α _inst_1))), (Function.Injective.{succ u2, succ u1} β α (coeFn.{max (succ u2) (succ u1), max (succ u2) (succ u1)} (RingHom.{u2, u1} β α (NonAssocRing.toNonAssocSemiring.{u2} β (Ring.toNonAssocRing.{u2} β _inst_3)) (NonAssocRing.toNonAssocSemiring.{u1} α (Ring.toNonAssocRing.{u1} α _inst_1))) (fun (_x : RingHom.{u2, u1} β α (NonAssocRing.toNonAssocSemiring.{u2} β (Ring.toNonAssocRing.{u2} β _inst_3)) (NonAssocRing.toNonAssocSemiring.{u1} α (Ring.toNonAssocRing.{u1} α _inst_1))) => β -> α) (RingHom.hasCoeToFun.{u2, u1} β α (NonAssocRing.toNonAssocSemiring.{u2} β (Ring.toNonAssocRing.{u2} β _inst_3)) (NonAssocRing.toNonAssocSemiring.{u1} α (Ring.toNonAssocRing.{u1} α _inst_1))) f)) -> (IsDomain.{u2} β (Ring.toSemiring.{u2} β _inst_3))
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} [_inst_1 : Ring.{u2} α] [_inst_2 : IsDomain.{u2} α (Ring.toSemiring.{u2} α _inst_1)] [_inst_3 : Ring.{u1} β] (f : RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)) (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1))), (Function.Injective.{succ u1, succ u2} β α (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)) (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1))) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : β) => α) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)) (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1))) β α (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)))) (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1)))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)) (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1))) β α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3))) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1))) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)) (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1))) β α (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)) (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1)) (RingHom.instRingHomClassRingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)) (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1)))))) f)) -> (IsDomain.{u1} β (Ring.toSemiring.{u1} β _inst_3))
+  forall {α : Type.{u2}} {β : Type.{u1}} [_inst_1 : Ring.{u2} α] [_inst_2 : IsDomain.{u2} α (Ring.toSemiring.{u2} α _inst_1)] [_inst_3 : Ring.{u1} β] (f : RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)) (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1))), (Function.Injective.{succ u1, succ u2} β α (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)) (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1))) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : β) => α) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)) (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1))) β α (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)))) (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1)))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)) (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1))) β α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3))) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1))) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)) (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1))) β α (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)) (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1)) (RingHom.instRingHomClassRingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)) (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1)))))) f)) -> (IsDomain.{u1} β (Ring.toSemiring.{u1} β _inst_3))
 Case conversion may be inaccurate. Consider using '#align function.injective.is_domain Function.Injective.isDomainₓ'. -/
 /-- Pullback `is_domain` instance along an injective function. -/
 protected theorem Function.Injective.isDomain [Ring α] [IsDomain α] [Ring β] (f : β →+* α)
@@ -1382,7 +1382,7 @@ def mkRingHomOfMulSelfOfTwoNeZero (h : ∀ x, f (x * x) = f x * f x) (h_two : (2
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} [_inst_1 : CommRing.{u1} α] [_inst_2 : IsDomain.{u1} α (Ring.toSemiring.{u1} α (CommRing.toRing.{u1} α _inst_1))] [_inst_3 : CommRing.{u2} β] (f : AddMonoidHom.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (Ring.toAddCommGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (Ring.toAddCommGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1))))))) (h : forall (x : β), Eq.{succ u1} α (coeFn.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (AddMonoidHom.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (Ring.toAddCommGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (Ring.toAddCommGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1))))))) (fun (_x : AddMonoidHom.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (Ring.toAddCommGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (Ring.toAddCommGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1))))))) => β -> α) (AddMonoidHom.hasCoeToFun.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (Ring.toAddCommGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (Ring.toAddCommGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1))))))) f (HMul.hMul.{u2, u2, u2} β β β (instHMul.{u2} β (Distrib.toHasMul.{u2} β (Ring.toDistrib.{u2} β (CommRing.toRing.{u2} β _inst_3)))) x x)) (HMul.hMul.{u1, u1, u1} α α α (instHMul.{u1} α (Distrib.toHasMul.{u1} α (Ring.toDistrib.{u1} α (CommRing.toRing.{u1} α _inst_1)))) (coeFn.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (AddMonoidHom.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (Ring.toAddCommGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (Ring.toAddCommGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1))))))) (fun (_x : AddMonoidHom.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (Ring.toAddCommGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (Ring.toAddCommGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1))))))) => β -> α) (AddMonoidHom.hasCoeToFun.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (Ring.toAddCommGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (Ring.toAddCommGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1))))))) f x) (coeFn.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (AddMonoidHom.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (Ring.toAddCommGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (Ring.toAddCommGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1))))))) (fun (_x : AddMonoidHom.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (Ring.toAddCommGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (Ring.toAddCommGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1))))))) => β -> α) (AddMonoidHom.hasCoeToFun.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (Ring.toAddCommGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (Ring.toAddCommGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1))))))) f x))) (h_two : Ne.{succ u1} α (OfNat.ofNat.{u1} α 2 (OfNat.mk.{u1} α 2 (bit0.{u1} α (Distrib.toHasAdd.{u1} α (Ring.toDistrib.{u1} α (CommRing.toRing.{u1} α _inst_1))) (One.one.{u1} α (AddMonoidWithOne.toOne.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (Ring.toAddCommGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1))))))))) (OfNat.ofNat.{u1} α 0 (OfNat.mk.{u1} α 0 (Zero.zero.{u1} α (MulZeroClass.toHasZero.{u1} α (NonUnitalNonAssocSemiring.toMulZeroClass.{u1} α (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} α (NonAssocRing.toNonUnitalNonAssocRing.{u1} α (Ring.toNonAssocRing.{u1} α (CommRing.toRing.{u1} α _inst_1)))))))))) (h_one : Eq.{succ u1} α (coeFn.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (AddMonoidHom.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (Ring.toAddCommGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (Ring.toAddCommGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1))))))) (fun (_x : AddMonoidHom.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (Ring.toAddCommGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (Ring.toAddCommGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1))))))) => β -> α) (AddMonoidHom.hasCoeToFun.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (Ring.toAddCommGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (Ring.toAddCommGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1))))))) f (OfNat.ofNat.{u2} β 1 (OfNat.mk.{u2} β 1 (One.one.{u2} β (AddMonoidWithOne.toOne.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (Ring.toAddCommGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3))))))))) (OfNat.ofNat.{u1} α 1 (OfNat.mk.{u1} α 1 (One.one.{u1} α (AddMonoidWithOne.toOne.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (Ring.toAddCommGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1))))))))), Eq.{max (succ u2) (succ u1)} ((fun (_x : RingHom.{u2, u1} β α (NonAssocRing.toNonAssocSemiring.{u2} β (Ring.toNonAssocRing.{u2} β (CommRing.toRing.{u2} β _inst_3))) (NonAssocRing.toNonAssocSemiring.{u1} α (Ring.toNonAssocRing.{u1} α (CommRing.toRing.{u1} α _inst_1)))) => β -> α) (AddMonoidHom.mkRingHomOfMulSelfOfTwoNeZero.{u1, u2} α β _inst_1 _inst_2 _inst_3 f h h_two h_one)) (coeFn.{max (succ u2) (succ u1), max (succ u2) (succ u1)} (RingHom.{u2, u1} β α (NonAssocRing.toNonAssocSemiring.{u2} β (Ring.toNonAssocRing.{u2} β (CommRing.toRing.{u2} β _inst_3))) (NonAssocRing.toNonAssocSemiring.{u1} α (Ring.toNonAssocRing.{u1} α (CommRing.toRing.{u1} α _inst_1)))) (fun (_x : RingHom.{u2, u1} β α (NonAssocRing.toNonAssocSemiring.{u2} β (Ring.toNonAssocRing.{u2} β (CommRing.toRing.{u2} β _inst_3))) (NonAssocRing.toNonAssocSemiring.{u1} α (Ring.toNonAssocRing.{u1} α (CommRing.toRing.{u1} α _inst_1)))) => β -> α) (RingHom.hasCoeToFun.{u2, u1} β α (NonAssocRing.toNonAssocSemiring.{u2} β (Ring.toNonAssocRing.{u2} β (CommRing.toRing.{u2} β _inst_3))) (NonAssocRing.toNonAssocSemiring.{u1} α (Ring.toNonAssocRing.{u1} α (CommRing.toRing.{u1} α _inst_1)))) (AddMonoidHom.mkRingHomOfMulSelfOfTwoNeZero.{u1, u2} α β _inst_1 _inst_2 _inst_3 f h h_two h_one)) (coeFn.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (AddMonoidHom.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} 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(AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (Ring.toAddCommGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (Ring.toAddCommGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1))))))) f)
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} [_inst_1 : CommRing.{u2} α] [_inst_2 : IsDomain.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1))] [_inst_3 : CommRing.{u1} β] (f : AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) (h : forall (x : β), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (HMul.hMul.{u1, u1, u1} β β β (instHMul.{u1} β (NonUnitalNonAssocRing.toMul.{u1} β (NonAssocRing.toNonUnitalNonAssocRing.{u1} β (Ring.toNonAssocRing.{u1} β (CommRing.toRing.{u1} β _inst_3))))) x x)) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} 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h_two h_one)) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) _x) (AddHomClass.toFunLike.{max u2 u1, u1, u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β α 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(Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1))))) (AddMonoidHom.addMonoidHomClass.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))))) f)
+  forall {α : Type.{u2}} {β : Type.{u1}} [_inst_1 : CommRing.{u2} α] [_inst_2 : IsDomain.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1))] [_inst_3 : CommRing.{u1} β] (f : AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) (h : forall (x : β), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (HMul.hMul.{u1, u1, u1} β β β (instHMul.{u1} β (NonUnitalNonAssocRing.toMul.{u1} β (NonAssocRing.toNonUnitalNonAssocRing.{u1} β (Ring.toNonAssocRing.{u1} β (CommRing.toRing.{u1} β _inst_3))))) x x)) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} 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(Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3)))))) (AddZeroClass.toAdd.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) (AddMonoidHomClass.toAddHomClass.{max u2 u1, u1, u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α 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(AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β α (AddZeroClass.toAdd.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3)))))) (AddZeroClass.toAdd.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) (AddMonoidHomClass.toAddHomClass.{max u2 u1, u1, u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1))))) (AddMonoidHom.addMonoidHomClass.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))))) f (OfNat.ofNat.{u1} β 1 (One.toOfNat1.{u1} β (Semiring.toOne.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3)))))) (OfNat.ofNat.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u1} β 1 (One.toOfNat1.{u1} β (Semiring.toOne.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3)))))) 1 (One.toOfNat1.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u1} β 1 (One.toOfNat1.{u1} β (Semiring.toOne.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3)))))) (Semiring.toOne.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u1} β 1 (One.toOfNat1.{u1} β (Semiring.toOne.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3)))))) (CommSemiring.toSemiring.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u1} β 1 (One.toOfNat1.{u1} β (Semiring.toOne.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3)))))) (CommRing.toCommSemiring.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u1} β 1 (One.toOfNat1.{u1} β (Semiring.toOne.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3)))))) _inst_1)))))), Eq.{max (succ u2) (succ u1)} (forall (a : β), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : β) => α) a) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3))) (Semiring.toNonAssocSemiring.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1)))) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : β) => α) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3))) (Semiring.toNonAssocSemiring.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1)))) β α (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (Semiring.toNonAssocSemiring.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3))))) (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (Semiring.toNonAssocSemiring.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1))))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3))) (Semiring.toNonAssocSemiring.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1)))) β α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (Semiring.toNonAssocSemiring.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3)))) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (Semiring.toNonAssocSemiring.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1)))) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3))) (Semiring.toNonAssocSemiring.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1)))) β α (Semiring.toNonAssocSemiring.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3))) (Semiring.toNonAssocSemiring.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1))) (RingHom.instRingHomClassRingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3))) (Semiring.toNonAssocSemiring.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1))))))) (AddMonoidHom.mkRingHomOfMulSelfOfTwoNeZero.{u2, u1} α β _inst_1 _inst_2 _inst_3 f h h_two h_one)) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) _x) (AddHomClass.toFunLike.{max u2 u1, u1, u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β α (AddZeroClass.toAdd.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3)))))) (AddZeroClass.toAdd.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) (AddMonoidHomClass.toAddHomClass.{max u2 u1, u1, u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1))))) (AddMonoidHom.addMonoidHomClass.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))))) f)
 Case conversion may be inaccurate. Consider using '#align add_monoid_hom.coe_fn_mk_ring_hom_of_mul_self_of_two_ne_zero AddMonoidHom.coe_fn_mkRingHomOfMulSelfOfTwoNeZeroₓ'. -/
 @[simp]
 theorem coe_fn_mkRingHomOfMulSelfOfTwoNeZero (h h_two h_one) :

mathlib commit https://github.com/leanprover-community/mathlib/commit/08e1d8d4d989df3a6df86f385e9053ec8a372cc1

@@ -1338,7 +1338,7 @@ end RingHom
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} [_inst_1 : Ring.{u1} α] [_inst_2 : IsDomain.{u1} α (Ring.toSemiring.{u1} α _inst_1)] [_inst_3 : Ring.{u2} β] (f : RingHom.{u2, u1} β α (NonAssocRing.toNonAssocSemiring.{u2} β (Ring.toNonAssocRing.{u2} β _inst_3)) (NonAssocRing.toNonAssocSemiring.{u1} α (Ring.toNonAssocRing.{u1} α _inst_1))), (Function.Injective.{succ u2, succ u1} β α (coeFn.{max (succ u2) (succ u1), max (succ u2) (succ u1)} (RingHom.{u2, u1} β α (NonAssocRing.toNonAssocSemiring.{u2} β (Ring.toNonAssocRing.{u2} β _inst_3)) (NonAssocRing.toNonAssocSemiring.{u1} α (Ring.toNonAssocRing.{u1} α _inst_1))) (fun (_x : RingHom.{u2, u1} β α (NonAssocRing.toNonAssocSemiring.{u2} β (Ring.toNonAssocRing.{u2} β _inst_3)) (NonAssocRing.toNonAssocSemiring.{u1} α (Ring.toNonAssocRing.{u1} α _inst_1))) => β -> α) (RingHom.hasCoeToFun.{u2, u1} β α (NonAssocRing.toNonAssocSemiring.{u2} β (Ring.toNonAssocRing.{u2} β _inst_3)) (NonAssocRing.toNonAssocSemiring.{u1} α (Ring.toNonAssocRing.{u1} α _inst_1))) f)) -> (IsDomain.{u2} β (Ring.toSemiring.{u2} β _inst_3))
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} [_inst_1 : Ring.{u2} α] [_inst_2 : IsDomain.{u2} α (Ring.toSemiring.{u2} α _inst_1)] [_inst_3 : Ring.{u1} β] (f : RingHom.{u1, u2} β α (NonAssocRing.toNonAssocSemiring.{u1} β (Ring.toNonAssocRing.{u1} β _inst_3)) (NonAssocRing.toNonAssocSemiring.{u2} α (Ring.toNonAssocRing.{u2} α _inst_1))), (Function.Injective.{succ u1, succ u2} β α (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (RingHom.{u1, u2} β α (NonAssocRing.toNonAssocSemiring.{u1} β (Ring.toNonAssocRing.{u1} β _inst_3)) (NonAssocRing.toNonAssocSemiring.{u2} α (Ring.toNonAssocRing.{u2} α _inst_1))) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : β) => α) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (RingHom.{u1, u2} β α (NonAssocRing.toNonAssocSemiring.{u1} β (Ring.toNonAssocRing.{u1} β _inst_3)) (NonAssocRing.toNonAssocSemiring.{u2} α (Ring.toNonAssocRing.{u2} α _inst_1))) β α (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (NonAssocRing.toNonAssocSemiring.{u1} β (Ring.toNonAssocRing.{u1} β _inst_3)))) (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (NonAssocRing.toNonAssocSemiring.{u2} α (Ring.toNonAssocRing.{u2} α _inst_1)))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} β α (NonAssocRing.toNonAssocSemiring.{u1} β (Ring.toNonAssocRing.{u1} β _inst_3)) (NonAssocRing.toNonAssocSemiring.{u2} α (Ring.toNonAssocRing.{u2} α _inst_1))) β α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (NonAssocRing.toNonAssocSemiring.{u1} β (Ring.toNonAssocRing.{u1} β _inst_3))) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (NonAssocRing.toNonAssocSemiring.{u2} α (Ring.toNonAssocRing.{u2} α _inst_1))) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} β α (NonAssocRing.toNonAssocSemiring.{u1} β (Ring.toNonAssocRing.{u1} β _inst_3)) (NonAssocRing.toNonAssocSemiring.{u2} α (Ring.toNonAssocRing.{u2} α _inst_1))) β α (NonAssocRing.toNonAssocSemiring.{u1} β (Ring.toNonAssocRing.{u1} β _inst_3)) (NonAssocRing.toNonAssocSemiring.{u2} α (Ring.toNonAssocRing.{u2} α _inst_1)) (RingHom.instRingHomClassRingHom.{u1, u2} β α (NonAssocRing.toNonAssocSemiring.{u1} β (Ring.toNonAssocRing.{u1} β _inst_3)) (NonAssocRing.toNonAssocSemiring.{u2} α (Ring.toNonAssocRing.{u2} α _inst_1)))))) f)) -> (IsDomain.{u1} β (Ring.toSemiring.{u1} β _inst_3))
+  forall {α : Type.{u2}} {β : Type.{u1}} [_inst_1 : Ring.{u2} α] [_inst_2 : IsDomain.{u2} α (Ring.toSemiring.{u2} α _inst_1)] [_inst_3 : Ring.{u1} β] (f : RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)) (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1))), (Function.Injective.{succ u1, succ u2} β α (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)) (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1))) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : β) => α) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)) (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1))) β α (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)))) (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1)))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)) (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1))) β α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3))) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1))) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)) (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1))) β α (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)) (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1)) (RingHom.instRingHomClassRingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (Ring.toSemiring.{u1} β _inst_3)) (Semiring.toNonAssocSemiring.{u2} α (Ring.toSemiring.{u2} α _inst_1)))))) f)) -> (IsDomain.{u1} β (Ring.toSemiring.{u1} β _inst_3))
 Case conversion may be inaccurate. Consider using '#align function.injective.is_domain Function.Injective.isDomainₓ'. -/
 /-- Pullback `is_domain` instance along an injective function. -/
 protected theorem Function.Injective.isDomain [Ring α] [IsDomain α] [Ring β] (f : β →+* α)
@@ -1358,7 +1358,7 @@ variable [CommRing α] [IsDomain α] [CommRing β] (f : β →+ α)
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} [_inst_1 : CommRing.{u1} α] [_inst_2 : IsDomain.{u1} α (Ring.toSemiring.{u1} α (CommRing.toRing.{u1} α _inst_1))] [_inst_3 : CommRing.{u2} β] (f : AddMonoidHom.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (Ring.toAddCommGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (Ring.toAddCommGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1))))))), (forall (x : β), Eq.{succ u1} α (coeFn.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (AddMonoidHom.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (Ring.toAddCommGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (Ring.toAddCommGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1))))))) (fun (_x : AddMonoidHom.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (Ring.toAddCommGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (Ring.toAddCommGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1))))))) => β -> α) (AddMonoidHom.hasCoeToFun.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β 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 but is expected to have type
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(AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (Ring.toAddGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1)))))) β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (Ring.toAddGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (Ring.toAddGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1))))) (AddMonoidHom.addMonoidHomClass.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (Ring.toAddGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (Ring.toAddGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1)))))))) f (OfNat.ofNat.{u2} β 1 (One.toOfNat1.{u2} β (NonAssocRing.toOne.{u2} β (Ring.toNonAssocRing.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (OfNat.ofNat.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u2} β 1 (One.toOfNat1.{u2} β (NonAssocRing.toOne.{u2} β (Ring.toNonAssocRing.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) 1 (One.toOfNat1.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u2} β 1 (One.toOfNat1.{u2} β (NonAssocRing.toOne.{u2} β (Ring.toNonAssocRing.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (NonAssocRing.toOne.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u2} β 1 (One.toOfNat1.{u2} β (NonAssocRing.toOne.{u2} β (Ring.toNonAssocRing.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (Ring.toNonAssocRing.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u2} β 1 (One.toOfNat1.{u2} β (NonAssocRing.toOne.{u2} β (Ring.toNonAssocRing.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (CommRing.toRing.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u2} β 1 (One.toOfNat1.{u2} β (NonAssocRing.toOne.{u2} β (Ring.toNonAssocRing.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) _inst_1)))))) -> (RingHom.{u2, u1} β α (NonAssocRing.toNonAssocSemiring.{u2} β (Ring.toNonAssocRing.{u2} β (CommRing.toRing.{u2} β _inst_3))) (NonAssocRing.toNonAssocSemiring.{u1} α (Ring.toNonAssocRing.{u1} α (CommRing.toRing.{u1} α _inst_1))))
+  forall {α : Type.{u1}} {β : Type.{u2}} [_inst_1 : CommRing.{u1} α] [_inst_2 : IsDomain.{u1} α (CommSemiring.toSemiring.{u1} α (CommRing.toCommSemiring.{u1} α _inst_1))] [_inst_3 : CommRing.{u2} β] (f : AddMonoidHom.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (Ring.toAddGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (Ring.toAddGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1)))))), (forall (x : β), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (HMul.hMul.{u2, u2, u2} β β β (instHMul.{u2} β (NonUnitalNonAssocRing.toMul.{u2} β (NonAssocRing.toNonUnitalNonAssocRing.{u2} β (Ring.toNonAssocRing.{u2} β (CommRing.toRing.{u2} β _inst_3))))) x x)) (FunLike.coe.{max (succ u1) (succ u2), succ u2, succ u1} (AddMonoidHom.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β 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_inst_1)))))) β α (AddZeroClass.toAdd.{u2} β (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (Ring.toAddGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (AddZeroClass.toAdd.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (Ring.toAddGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1)))))) (AddMonoidHomClass.toAddHomClass.{max u1 u2, u2, u1} (AddMonoidHom.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (Ring.toAddGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (Ring.toAddGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1)))))) β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β 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β (Semiring.toOne.{u2} β (CommSemiring.toSemiring.{u2} β (CommRing.toCommSemiring.{u2} β _inst_3)))))) (OfNat.ofNat.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u2} β 1 (One.toOfNat1.{u2} β (Semiring.toOne.{u2} β (CommSemiring.toSemiring.{u2} β (CommRing.toCommSemiring.{u2} β _inst_3)))))) 1 (One.toOfNat1.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u2} β 1 (One.toOfNat1.{u2} β (Semiring.toOne.{u2} β (CommSemiring.toSemiring.{u2} β (CommRing.toCommSemiring.{u2} β _inst_3)))))) (Semiring.toOne.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u2} β 1 (One.toOfNat1.{u2} β (Semiring.toOne.{u2} β (CommSemiring.toSemiring.{u2} β (CommRing.toCommSemiring.{u2} β _inst_3)))))) (CommSemiring.toSemiring.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u2} β 1 (One.toOfNat1.{u2} β (Semiring.toOne.{u2} β (CommSemiring.toSemiring.{u2} β (CommRing.toCommSemiring.{u2} β _inst_3)))))) (CommRing.toCommSemiring.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u2} β 1 (One.toOfNat1.{u2} β (Semiring.toOne.{u2} β (CommSemiring.toSemiring.{u2} β (CommRing.toCommSemiring.{u2} β _inst_3)))))) _inst_1)))))) -> (RingHom.{u2, u1} β α (Semiring.toNonAssocSemiring.{u2} β (CommSemiring.toSemiring.{u2} β (CommRing.toCommSemiring.{u2} β _inst_3))) (Semiring.toNonAssocSemiring.{u1} α (CommSemiring.toSemiring.{u1} α (CommRing.toCommSemiring.{u1} α _inst_1))))
 Case conversion may be inaccurate. Consider using '#align add_monoid_hom.mk_ring_hom_of_mul_self_of_two_ne_zero AddMonoidHom.mkRingHomOfMulSelfOfTwoNeZeroₓ'. -/
 /-- Make a ring homomorphism from an additive group homomorphism from a commutative ring to an
 integral domain that commutes with self multiplication, assumes that two is nonzero and `1` is sent
@@ -1382,7 +1382,7 @@ def mkRingHomOfMulSelfOfTwoNeZero (h : ∀ x, f (x * x) = f x * f x) (h_two : (2
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} [_inst_1 : CommRing.{u1} α] [_inst_2 : IsDomain.{u1} α (Ring.toSemiring.{u1} α (CommRing.toRing.{u1} α _inst_1))] [_inst_3 : CommRing.{u2} β] (f : AddMonoidHom.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (Ring.toAddCommGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (Ring.toAddCommGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1))))))) (h : forall (x : β), Eq.{succ u1} α (coeFn.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (AddMonoidHom.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (Ring.toAddCommGroupWithOne.{u2} β 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 but is expected to have type
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(AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1))))) (AddMonoidHom.addMonoidHomClass.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))))) f)
+  forall {α : Type.{u2}} {β : Type.{u1}} [_inst_1 : CommRing.{u2} α] [_inst_2 : IsDomain.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1))] [_inst_3 : CommRing.{u1} β] (f : AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) (h : forall (x : β), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (HMul.hMul.{u1, u1, u1} β β β (instHMul.{u1} β (NonUnitalNonAssocRing.toMul.{u1} β (NonAssocRing.toNonUnitalNonAssocRing.{u1} β (Ring.toNonAssocRing.{u1} β (CommRing.toRing.{u1} β _inst_3))))) x x)) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} 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α (CommSemiring.toCommMonoidWithZero.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1)))))) (h_one : Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u1} β 1 (One.toOfNat1.{u1} β (Semiring.toOne.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3)))))) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) _x) (AddHomClass.toFunLike.{max u2 u1, u1, u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β α (AddZeroClass.toAdd.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3)))))) (AddZeroClass.toAdd.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) (AddMonoidHomClass.toAddHomClass.{max u2 u1, u1, u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) 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(CommRing.toCommSemiring.{u2} α _inst_1)))) β α (NonUnitalNonAssocSemiring.toMul.{u1} β (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (Semiring.toNonAssocSemiring.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3))))) (NonUnitalNonAssocSemiring.toMul.{u2} α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (Semiring.toNonAssocSemiring.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1))))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3))) (Semiring.toNonAssocSemiring.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1)))) β α (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} β (Semiring.toNonAssocSemiring.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3)))) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} α (Semiring.toNonAssocSemiring.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1)))) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3))) (Semiring.toNonAssocSemiring.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1)))) β α (Semiring.toNonAssocSemiring.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3))) (Semiring.toNonAssocSemiring.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1))) (RingHom.instRingHomClassRingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3))) (Semiring.toNonAssocSemiring.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1))))))) (AddMonoidHom.mkRingHomOfMulSelfOfTwoNeZero.{u2, u1} α β _inst_1 _inst_2 _inst_3 f h h_two h_one)) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) _x) (AddHomClass.toFunLike.{max u2 u1, u1, u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β α (AddZeroClass.toAdd.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3)))))) (AddZeroClass.toAdd.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) (AddMonoidHomClass.toAddHomClass.{max u2 u1, u1, u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1))))) (AddMonoidHom.addMonoidHomClass.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))))) f)
 Case conversion may be inaccurate. Consider using '#align add_monoid_hom.coe_fn_mk_ring_hom_of_mul_self_of_two_ne_zero AddMonoidHom.coe_fn_mkRingHomOfMulSelfOfTwoNeZeroₓ'. -/
 @[simp]
 theorem coe_fn_mkRingHomOfMulSelfOfTwoNeZero (h h_two h_one) :
@@ -1394,7 +1394,7 @@ theorem coe_fn_mkRingHomOfMulSelfOfTwoNeZero (h h_two h_one) :
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} [_inst_1 : CommRing.{u1} α] [_inst_2 : IsDomain.{u1} α (Ring.toSemiring.{u1} α (CommRing.toRing.{u1} α _inst_1))] [_inst_3 : CommRing.{u2} β] (f : AddMonoidHom.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (Ring.toAddCommGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (Ring.toAddCommGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1))))))) (h : forall (x : β), Eq.{succ u1} α (coeFn.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (AddMonoidHom.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (Ring.toAddCommGroupWithOne.{u2} β 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(Ring.toAddCommGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α (AddGroupWithOne.toAddMonoidWithOne.{u1} α (AddCommGroupWithOne.toAddGroupWithOne.{u1} α (Ring.toAddCommGroupWithOne.{u1} α (CommRing.toRing.{u1} α _inst_1))))))) f (HMul.hMul.{u2, u2, u2} β β β (instHMul.{u2} β (Distrib.toHasMul.{u2} β (Ring.toDistrib.{u2} β (CommRing.toRing.{u2} β _inst_3)))) x x)) (HMul.hMul.{u1, u1, u1} α α α (instHMul.{u1} α (Distrib.toHasMul.{u1} α (Ring.toDistrib.{u1} α (CommRing.toRing.{u1} α _inst_1)))) (coeFn.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (AddMonoidHom.{u2, u1} β α (AddMonoid.toAddZeroClass.{u2} β (AddMonoidWithOne.toAddMonoid.{u2} β (AddGroupWithOne.toAddMonoidWithOne.{u2} β (AddCommGroupWithOne.toAddGroupWithOne.{u2} β (Ring.toAddCommGroupWithOne.{u2} β (CommRing.toRing.{u2} β _inst_3)))))) (AddMonoid.toAddZeroClass.{u1} α (AddMonoidWithOne.toAddMonoid.{u1} α 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 but is expected to have type
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α (CommRing.toRing.{u2} α _inst_1))))) (AddMonoidHom.mkRingHomOfMulSelfOfTwoNeZero.{u2, u1} α β _inst_1 _inst_2 _inst_3 f h h_two h_one)) f
+  forall {α : Type.{u2}} {β : Type.{u1}} [_inst_1 : CommRing.{u2} α] [_inst_2 : IsDomain.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1))] [_inst_3 : CommRing.{u1} β] (f : AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) (h : forall (x : β), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (HMul.hMul.{u1, u1, u1} β β β (instHMul.{u1} β (NonUnitalNonAssocRing.toMul.{u1} β (NonAssocRing.toNonUnitalNonAssocRing.{u1} β (Ring.toNonAssocRing.{u1} β (CommRing.toRing.{u1} β _inst_3))))) x x)) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} 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(Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1))))) (AddMonoidHom.addMonoidHomClass.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))))) f x) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) _x) (AddHomClass.toFunLike.{max u2 u1, u1, u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β α (AddZeroClass.toAdd.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3)))))) (AddZeroClass.toAdd.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) (AddMonoidHomClass.toAddHomClass.{max u2 u1, u1, u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1))))) (AddMonoidHom.addMonoidHomClass.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))))) f x))) (h_two : Ne.{succ u2} α (OfNat.ofNat.{u2} α 2 (instOfNat.{u2} α 2 (Semiring.toNatCast.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1))) (instAtLeastTwoHAddNatInstHAddInstAddNatOfNat (OfNat.ofNat.{0} Nat 0 (instOfNatNat 0))))) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (CommMonoidWithZero.toZero.{u2} α (CommSemiring.toCommMonoidWithZero.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1)))))) (h_one : Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u1} β 1 (One.toOfNat1.{u1} β (Semiring.toOne.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3)))))) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) _x) (AddHomClass.toFunLike.{max u2 u1, u1, u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β α (AddZeroClass.toAdd.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3)))))) (AddZeroClass.toAdd.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) (AddMonoidHomClass.toAddHomClass.{max u2 u1, u1, u2} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1))))) (AddMonoidHom.addMonoidHomClass.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))))) f (OfNat.ofNat.{u1} β 1 (One.toOfNat1.{u1} β (Semiring.toOne.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3)))))) (OfNat.ofNat.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u1} β 1 (One.toOfNat1.{u1} β (Semiring.toOne.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3)))))) 1 (One.toOfNat1.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u1} β 1 (One.toOfNat1.{u1} β (Semiring.toOne.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3)))))) (Semiring.toOne.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u1} β 1 (One.toOfNat1.{u1} β (Semiring.toOne.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3)))))) (CommSemiring.toSemiring.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u1} β 1 (One.toOfNat1.{u1} β (Semiring.toOne.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3)))))) (CommRing.toCommSemiring.{u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : β) => α) (OfNat.ofNat.{u1} β 1 (One.toOfNat1.{u1} β (Semiring.toOne.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3)))))) _inst_1)))))), Eq.{max (succ u2) (succ u1)} (AddMonoidHom.{u1, u2} β α (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1)))))) (AddMonoidHomClass.toAddMonoidHom.{u1, u2, max u2 u1} β α (RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3))) (Semiring.toNonAssocSemiring.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1)))) (AddMonoid.toAddZeroClass.{u1} β (AddMonoidWithOne.toAddMonoid.{u1} β (AddGroupWithOne.toAddMonoidWithOne.{u1} β (Ring.toAddGroupWithOne.{u1} β (CommRing.toRing.{u1} β _inst_3))))) (AddMonoid.toAddZeroClass.{u2} α (AddMonoidWithOne.toAddMonoid.{u2} α (AddGroupWithOne.toAddMonoidWithOne.{u2} α (Ring.toAddGroupWithOne.{u2} α (CommRing.toRing.{u2} α _inst_1))))) (RingHomClass.toAddMonoidHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3))) (Semiring.toNonAssocSemiring.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1)))) β α (Semiring.toNonAssocSemiring.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3))) (Semiring.toNonAssocSemiring.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1))) (RingHom.instRingHomClassRingHom.{u1, u2} β α (Semiring.toNonAssocSemiring.{u1} β (CommSemiring.toSemiring.{u1} β (CommRing.toCommSemiring.{u1} β _inst_3))) (Semiring.toNonAssocSemiring.{u2} α (CommSemiring.toSemiring.{u2} α (CommRing.toCommSemiring.{u2} α _inst_1))))) (AddMonoidHom.mkRingHomOfMulSelfOfTwoNeZero.{u2, u1} α β _inst_1 _inst_2 _inst_3 f h h_two h_one)) f
 Case conversion may be inaccurate. Consider using '#align add_monoid_hom.coe_add_monoid_hom_mk_ring_hom_of_mul_self_of_two_ne_zero AddMonoidHom.coe_addMonoidHom_mkRingHomOfMulSelfOfTwoNeZeroₓ'. -/
 @[simp]
 theorem coe_addMonoidHom_mkRingHomOfMulSelfOfTwoNeZero (h h_two h_one) :

mathlib commit https://github.com/leanprover-community/mathlib/commit/347636a7a80595d55bedf6e6fbd996a3c39da69a

@@ -172,7 +172,7 @@ theorem [anonymous] [NonUnitalRingHomClass F α β] (f : F) : ((f : α →ₙ+*
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonUnitalNonAssocSemiring.{u1} α} {rβ : NonUnitalNonAssocSemiring.{u2} β} (f : NonUnitalRingHom.{u1, u2} α β rα rβ), Eq.{max (succ u1) (succ u2)} (α -> β) (coeFn.{max (succ u2) (succ u1), max (succ u1) (succ u2)} (MulHom.{u1, u2} α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) (fun (_x : MulHom.{u1, u2} α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) => α -> β) (MulHom.hasCoeToFun.{u1, u2} α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) (NonUnitalRingHom.toMulHom.{u1, u2} α β rα rβ f)) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f)
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonUnitalNonAssocSemiring.{u2} α} {rβ : NonUnitalNonAssocSemiring.{u1} β} (f : NonUnitalRingHom.{u2, u1} α β rα rβ), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (MulHom.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ)) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (MulHom.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ)) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (MulHom.mulHomClass.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ))) (NonUnitalRingHom.toMulHom.{u2, u1} α β rα rβ f)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f)
+  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β] (f : NonUnitalRingHom.{u2, u1} α β rα rβ), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (MulHom.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ)) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (MulHom.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ)) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (MulHom.mulHomClass.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ))) (NonUnitalRingHom.toMulHom.{u2, u1} α β rα rβ f)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f)
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.coe_to_mul_hom NonUnitalRingHom.coe_toMulHomₓ'. -/
 @[simp]
 theorem coe_toMulHom (f : α →ₙ+* β) : ⇑f.toMulHom = f :=
@@ -183,7 +183,7 @@ theorem coe_toMulHom (f : α →ₙ+* β) : ⇑f.toMulHom = f :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonUnitalNonAssocSemiring.{u1} α} {rβ : NonUnitalNonAssocSemiring.{u2} β} (f : α -> β) (h₁ : forall (x : α) (y : α), Eq.{succ u2} β (f (HMul.hMul.{u1, u1, u1} α α α (instHMul.{u1} α (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα))) x y)) (HMul.hMul.{u2, u2, u2} β β β (instHMul.{u2} β (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) (f x) (f y))) (h₂ : Eq.{succ u2} β (f (OfNat.ofNat.{u1} α 0 (OfNat.mk.{u1} α 0 (Zero.zero.{u1} α (AddZeroClass.toHasZero.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα)))))))) (OfNat.ofNat.{u2} β 0 (OfNat.mk.{u2} β 0 (Zero.zero.{u2} β (AddZeroClass.toHasZero.{u2} β (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))))))) (h₃ : forall (x : α) (y : α), Eq.{succ u2} β (f (HAdd.hAdd.{u1, u1, u1} α α α (instHAdd.{u1} α (AddZeroClass.toHasAdd.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))))) x y)) (HAdd.hAdd.{u2, u2, u2} β β β (instHAdd.{u2} β (AddZeroClass.toHasAdd.{u2} β (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))))) (f x) (f y))), Eq.{max (succ u2) (succ u1)} (MulHom.{u1, u2} α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) ((fun (a : Sort.{max (succ u1) (succ u2)}) (b : Sort.{max (succ u2) (succ u1)}) [self : HasLiftT.{max (succ u1) (succ u2), max (succ u2) (succ u1)} a b] => self.0) (NonUnitalRingHom.{u1, u2} α β rα rβ) (MulHom.{u1, u2} α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) (HasLiftT.mk.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (MulHom.{u1, u2} α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) (CoeTCₓ.coe.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (MulHom.{u1, u2} α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) (MulHom.hasCoeT.{u1, u2, max u1 u2} α β (NonUnitalRingHom.{u1, u2} α β rα rβ) (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β rα rβ (NonUnitalRingHom.nonUnitalRingHomClass.{u1, u2} α β rα rβ))))) (NonUnitalRingHom.mk.{u1, u2} α β rα rβ f h₁ h₂ h₃)) (MulHom.mk.{u1, u2} α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ)) f h₁)
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonUnitalNonAssocSemiring.{u1} α} {rβ : NonUnitalNonAssocSemiring.{u2} β} (f : α -> β) (h₁ : forall (x : α) (y : α), Eq.{succ u2} β (f (HMul.hMul.{u1, u1, u1} α α α (instHMul.{u1} α (NonUnitalNonAssocSemiring.toMul.{u1} α rα)) x y)) (HMul.hMul.{u2, u2, u2} β β β (instHMul.{u2} β (NonUnitalNonAssocSemiring.toMul.{u2} β rβ)) (f x) (f y))) (h₂ : Eq.{succ u2} β (MulHom.toFun.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (MulHom.mk.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) f h₁) (OfNat.ofNat.{u1} α 0 (Zero.toOfNat0.{u1} α (AddZeroClass.toZero.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))))))) (OfNat.ofNat.{u2} β 0 (Zero.toOfNat0.{u2} β (AddZeroClass.toZero.{u2} β (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))))))) (h₃ : forall (x : α) (y : α), Eq.{succ u2} β (MulHom.toFun.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (MulHom.mk.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) f h₁) (HAdd.hAdd.{u1, u1, u1} α α α (instHAdd.{u1} α (AddZeroClass.toAdd.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))))) x y)) (HAdd.hAdd.{u2, u2, u2} β β β (instHAdd.{u2} β (AddZeroClass.toAdd.{u2} β (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))))) (MulHom.toFun.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (MulHom.mk.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) f h₁) x) (MulHom.toFun.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (MulHom.mk.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) f h₁) y))), Eq.{max (succ u1) (succ u2)} (MulHom.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ)) (MulHomClass.toMulHom.{u1, u2, max u1 u2} α β (NonUnitalRingHom.{u1, u2} α β rα rβ) (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} α β rα rβ)) (NonUnitalRingHom.mk.{u1, u2} α β rα rβ (MulHom.mk.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) f h₁) h₂ h₃)) (MulHom.mk.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) f h₁)
+  forall {α : Type.{u1}} {β : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] (f : α -> β) (h₁ : forall (x : α) (y : α), Eq.{succ u2} β (f (HMul.hMul.{u1, u1, u1} α α α (instHMul.{u1} α (NonUnitalNonAssocSemiring.toMul.{u1} α rα)) x y)) (HMul.hMul.{u2, u2, u2} β β β (instHMul.{u2} β (NonUnitalNonAssocSemiring.toMul.{u2} β rβ)) (f x) (f y))) (h₂ : Eq.{succ u2} β (MulHom.toFun.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (MulHom.mk.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) f h₁) (OfNat.ofNat.{u1} α 0 (Zero.toOfNat0.{u1} α (AddZeroClass.toZero.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))))))) (OfNat.ofNat.{u2} β 0 (Zero.toOfNat0.{u2} β (AddZeroClass.toZero.{u2} β (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))))))) (h₃ : forall (x : α) (y : α), Eq.{succ u2} β (MulHom.toFun.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (MulHom.mk.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) f h₁) (HAdd.hAdd.{u1, u1, u1} α α α (instHAdd.{u1} α (AddZeroClass.toAdd.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))))) x y)) (HAdd.hAdd.{u2, u2, u2} β β β (instHAdd.{u2} β (AddZeroClass.toAdd.{u2} β (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))))) (MulHom.toFun.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (MulHom.mk.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) f h₁) x) (MulHom.toFun.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (MulHom.mk.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) f h₁) y))), Eq.{max (succ u1) (succ u2)} (MulHom.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ)) (MulHomClass.toMulHom.{u1, u2, max u1 u2} α β (NonUnitalRingHom.{u1, u2} α β rα rβ) (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} α β rα rβ)) (NonUnitalRingHom.mk.{u1, u2} α β rα rβ (MulHom.mk.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) f h₁) h₂ h₃)) (MulHom.mk.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) f h₁)
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.coe_mul_hom_mk NonUnitalRingHom.coe_mulHom_mkₓ'. -/
 @[simp]
 theorem coe_mulHom_mk (f : α → β) (h₁ h₂ h₃) : ((⟨f, h₁, h₂, h₃⟩ : α →ₙ+* β) : α →ₙ* β) = ⟨f, h₁⟩ :=
@@ -194,7 +194,7 @@ theorem coe_mulHom_mk (f : α → β) (h₁ h₂ h₃) : ((⟨f, h₁, h₂, h
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonUnitalNonAssocSemiring.{u1} α} {rβ : NonUnitalNonAssocSemiring.{u2} β} (f : NonUnitalRingHom.{u1, u2} α β rα rβ), Eq.{max (succ u1) (succ u2)} (α -> β) (coeFn.{max (succ u2) (succ u1), max (succ u1) (succ u2)} (AddMonoidHom.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) (fun (_x : AddMonoidHom.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) => α -> β) (AddMonoidHom.hasCoeToFun.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) (NonUnitalRingHom.toAddMonoidHom.{u1, u2} α β rα rβ f)) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f)
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonUnitalNonAssocSemiring.{u2} α} {rβ : NonUnitalNonAssocSemiring.{u1} β} (f : NonUnitalRingHom.{u2, u1} α β rα rβ), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : α) => β) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (AddMonoidHom.{u2, u1} α β (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ)))) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : α) => β) _x) (AddHomClass.toFunLike.{max u2 u1, u2, u1} (AddMonoidHom.{u2, u1} α β (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ)))) α β (AddZeroClass.toAdd.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα)))) (AddZeroClass.toAdd.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ)))) (AddMonoidHomClass.toAddHomClass.{max u2 u1, u2, u1} (AddMonoidHom.{u2, u1} α β (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ)))) α β (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ))) (AddMonoidHom.addMonoidHomClass.{u2, u1} α β (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ)))))) (NonUnitalRingHom.toAddMonoidHom.{u2, u1} α β rα rβ f)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f)
+  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β] (f : NonUnitalRingHom.{u2, u1} α β rα rβ), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : α) => β) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (AddMonoidHom.{u2, u1} α β (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ)))) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.403 : α) => β) _x) (AddHomClass.toFunLike.{max u2 u1, u2, u1} (AddMonoidHom.{u2, u1} α β (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ)))) α β (AddZeroClass.toAdd.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα)))) (AddZeroClass.toAdd.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ)))) (AddMonoidHomClass.toAddHomClass.{max u2 u1, u2, u1} (AddMonoidHom.{u2, u1} α β (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ)))) α β (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ))) (AddMonoidHom.addMonoidHomClass.{u2, u1} α β (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ)))))) (NonUnitalRingHom.toAddMonoidHom.{u2, u1} α β rα rβ f)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f)
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.coe_to_add_monoid_hom NonUnitalRingHom.coe_toAddMonoidHomₓ'. -/
 @[simp]
 theorem coe_toAddMonoidHom (f : α →ₙ+* β) : ⇑f.toAddMonoidHom = f :=
@@ -205,7 +205,7 @@ theorem coe_toAddMonoidHom (f : α →ₙ+* β) : ⇑f.toAddMonoidHom = f :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonUnitalNonAssocSemiring.{u1} α} {rβ : NonUnitalNonAssocSemiring.{u2} β} (f : α -> β) (h₁ : forall (x : α) (y : α), Eq.{succ u2} β (f (HMul.hMul.{u1, u1, u1} α α α (instHMul.{u1} α (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα))) x y)) (HMul.hMul.{u2, u2, u2} β β β (instHMul.{u2} β (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) (f x) (f y))) (h₂ : Eq.{succ u2} β (f (OfNat.ofNat.{u1} α 0 (OfNat.mk.{u1} α 0 (Zero.zero.{u1} α (AddZeroClass.toHasZero.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα)))))))) (OfNat.ofNat.{u2} β 0 (OfNat.mk.{u2} β 0 (Zero.zero.{u2} β (AddZeroClass.toHasZero.{u2} β (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))))))) (h₃ : forall (x : α) (y : α), Eq.{succ u2} β (f (HAdd.hAdd.{u1, u1, u1} α α α (instHAdd.{u1} α (AddZeroClass.toHasAdd.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))))) x y)) (HAdd.hAdd.{u2, u2, u2} β β β (instHAdd.{u2} β (AddZeroClass.toHasAdd.{u2} β (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))))) (f x) (f y))), Eq.{max (succ u2) (succ u1)} (AddMonoidHom.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) ((fun (a : Sort.{max (succ u1) (succ u2)}) (b : Sort.{max (succ u2) (succ u1)}) [self : HasLiftT.{max (succ u1) (succ u2), max (succ u2) (succ u1)} a b] => self.0) (NonUnitalRingHom.{u1, u2} α β rα rβ) (AddMonoidHom.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) (HasLiftT.mk.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (AddMonoidHom.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) (CoeTCₓ.coe.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (AddMonoidHom.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) (AddMonoidHom.hasCoeT.{u1, u2, max u1 u2} α β (NonUnitalRingHom.{u1, u2} α β rα rβ) (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))) (NonUnitalRingHomClass.toAddMonoidHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β rα rβ (NonUnitalRingHom.nonUnitalRingHomClass.{u1, u2} α β rα rβ))))) (NonUnitalRingHom.mk.{u1, u2} α β rα rβ f h₁ h₂ h₃)) (AddMonoidHom.mk.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))) f h₂ h₃)
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonUnitalNonAssocSemiring.{u1} α} {rβ : NonUnitalNonAssocSemiring.{u2} β} (f : α -> β) (h₁ : forall (x : α) (y : α), Eq.{succ u2} β (f (HMul.hMul.{u1, u1, u1} α α α (instHMul.{u1} α (NonUnitalNonAssocSemiring.toMul.{u1} α rα)) x y)) (HMul.hMul.{u2, u2, u2} β β β (instHMul.{u2} β (NonUnitalNonAssocSemiring.toMul.{u2} β rβ)) (f x) (f y))) (h₂ : Eq.{succ u2} β (MulHom.toFun.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (MulHom.mk.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) f h₁) (OfNat.ofNat.{u1} α 0 (Zero.toOfNat0.{u1} α (AddZeroClass.toZero.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))))))) (OfNat.ofNat.{u2} β 0 (Zero.toOfNat0.{u2} β (AddZeroClass.toZero.{u2} β (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))))))) (h₃ : forall (x : α) (y : α), Eq.{succ u2} β (MulHom.toFun.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (MulHom.mk.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) f h₁) (HAdd.hAdd.{u1, u1, u1} α α α (instHAdd.{u1} α (AddZeroClass.toAdd.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))))) x y)) (HAdd.hAdd.{u2, u2, u2} β β β (instHAdd.{u2} β (AddZeroClass.toAdd.{u2} β (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))))) (MulHom.toFun.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (MulHom.mk.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) f h₁) x) (MulHom.toFun.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (MulHom.mk.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) f h₁) y))), Eq.{max (succ u1) (succ u2)} (AddMonoidHom.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) (AddMonoidHomClass.toAddMonoidHom.{u1, u2, max u1 u2} α β (NonUnitalRingHom.{u1, u2} α β rα rβ) (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))) (NonUnitalRingHomClass.toAddMonoidHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} α β rα rβ)) (NonUnitalRingHom.mk.{u1, u2} α β rα rβ (MulHom.mk.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) f h₁) h₂ h₃)) (AddMonoidHom.mk.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))) (ZeroHom.mk.{u1, u2} α β (AddZeroClass.toZero.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα)))) (AddZeroClass.toZero.{u2} β (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) f h₂) h₃)
+  forall {α : Type.{u1}} {β : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] (f : α -> β) (h₁ : forall (x : α) (y : α), Eq.{succ u2} β (f (HMul.hMul.{u1, u1, u1} α α α (instHMul.{u1} α (NonUnitalNonAssocSemiring.toMul.{u1} α rα)) x y)) (HMul.hMul.{u2, u2, u2} β β β (instHMul.{u2} β (NonUnitalNonAssocSemiring.toMul.{u2} β rβ)) (f x) (f y))) (h₂ : Eq.{succ u2} β (MulHom.toFun.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (MulHom.mk.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) f h₁) (OfNat.ofNat.{u1} α 0 (Zero.toOfNat0.{u1} α (AddZeroClass.toZero.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))))))) (OfNat.ofNat.{u2} β 0 (Zero.toOfNat0.{u2} β (AddZeroClass.toZero.{u2} β (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))))))) (h₃ : forall (x : α) (y : α), Eq.{succ u2} β (MulHom.toFun.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (MulHom.mk.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) f h₁) (HAdd.hAdd.{u1, u1, u1} α α α (instHAdd.{u1} α (AddZeroClass.toAdd.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))))) x y)) (HAdd.hAdd.{u2, u2, u2} β β β (instHAdd.{u2} β (AddZeroClass.toAdd.{u2} β (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))))) (MulHom.toFun.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (MulHom.mk.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) f h₁) x) (MulHom.toFun.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (MulHom.mk.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) f h₁) y))), Eq.{max (succ u1) (succ u2)} (AddMonoidHom.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) (AddMonoidHomClass.toAddMonoidHom.{u1, u2, max u1 u2} α β (NonUnitalRingHom.{u1, u2} α β rα rβ) (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))) (NonUnitalRingHomClass.toAddMonoidHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} α β rα rβ)) (NonUnitalRingHom.mk.{u1, u2} α β rα rβ (MulHom.mk.{u1, u2} α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) f h₁) h₂ h₃)) (AddMonoidHom.mk.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))) (ZeroHom.mk.{u1, u2} α β (AddZeroClass.toZero.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα)))) (AddZeroClass.toZero.{u2} β (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) f h₂) h₃)
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.coe_add_monoid_hom_mk NonUnitalRingHom.coe_addMonoidHom_mkₓ'. -/
 @[simp]
 theorem coe_addMonoidHom_mk (f : α → β) (h₁ h₂ h₃) :
@@ -217,7 +217,7 @@ theorem coe_addMonoidHom_mk (f : α → β) (h₁ h₂ h₃) :
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonUnitalNonAssocSemiring.{u1} α} {rβ : NonUnitalNonAssocSemiring.{u2} β} (f : NonUnitalRingHom.{u1, u2} α β rα rβ) (f' : α -> β), (Eq.{max (succ u1) (succ u2)} (α -> β) f' (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f)) -> (NonUnitalRingHom.{u1, u2} α β rα rβ)
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonUnitalNonAssocSemiring.{u1} α} {rβ : NonUnitalNonAssocSemiring.{u2} β} (f : NonUnitalRingHom.{u1, u2} α β rα rβ) (f' : α -> β), (Eq.{max (succ u1) (succ u2)} (α -> β) f' (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} α β rα rβ))) f)) -> (NonUnitalRingHom.{u1, u2} α β rα rβ)
+  forall {α : Type.{u1}} {β : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] (f : NonUnitalRingHom.{u1, u2} α β rα rβ) (f' : α -> β), (Eq.{max (succ u1) (succ u2)} (α -> β) f' (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} α β rα rβ))) f)) -> (NonUnitalRingHom.{u1, u2} α β rα rβ)
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.copy NonUnitalRingHom.copyₓ'. -/
 /-- Copy of a `ring_hom` with a new `to_fun` equal to the old one. Useful to fix definitional
 equalities. -/
@@ -229,7 +229,7 @@ protected def copy (f : α →ₙ+* β) (f' : α → β) (h : f' = f) : α →
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonUnitalNonAssocSemiring.{u1} α} {rβ : NonUnitalNonAssocSemiring.{u2} β} (f : NonUnitalRingHom.{u1, u2} α β rα rβ) (f' : α -> β) (h : Eq.{max (succ u1) (succ u2)} (α -> β) f' (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f)), Eq.{max (succ u1) (succ u2)} (α -> β) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) (NonUnitalRingHom.copy.{u1, u2} α β rα rβ f f' h)) f'
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonUnitalNonAssocSemiring.{u2} α} {rβ : NonUnitalNonAssocSemiring.{u1} β} (f : NonUnitalRingHom.{u2, u1} α β rα rβ) (f' : α -> β) (h : Eq.{max (succ u2) (succ u1)} (α -> β) f' (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f)), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) (NonUnitalRingHom.copy.{u2, u1} α β rα rβ f f' h)) f'
+  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β] (f : NonUnitalRingHom.{u2, u1} α β rα rβ) (f' : α -> β) (h : Eq.{max (succ u2) (succ u1)} (α -> β) f' (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f)), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) (NonUnitalRingHom.copy.{u2, u1} α β rα rβ f f' h)) f'
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.coe_copy NonUnitalRingHom.coe_copyₓ'. -/
 @[simp]
 theorem coe_copy (f : α →ₙ+* β) (f' : α → β) (h : f' = f) : ⇑(f.copy f' h) = f' :=
@@ -240,7 +240,7 @@ theorem coe_copy (f : α →ₙ+* β) (f' : α → β) (h : f' = f) : ⇑(f.copy
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonUnitalNonAssocSemiring.{u1} α} {rβ : NonUnitalNonAssocSemiring.{u2} β} (f : NonUnitalRingHom.{u1, u2} α β rα rβ) (f' : α -> β) (h : Eq.{max (succ u1) (succ u2)} (α -> β) f' (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f)), Eq.{max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (NonUnitalRingHom.copy.{u1, u2} α β rα rβ f f' h) f
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonUnitalNonAssocSemiring.{u2} α} {rβ : NonUnitalNonAssocSemiring.{u1} β} (f : NonUnitalRingHom.{u2, u1} α β rα rβ) (f' : α -> β) (h : Eq.{max (succ u2) (succ u1)} (α -> β) f' (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f)), Eq.{max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} α β rα rβ) (NonUnitalRingHom.copy.{u2, u1} α β rα rβ f f' h) f
+  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β] (f : NonUnitalRingHom.{u2, u1} α β rα rβ) (f' : α -> β) (h : Eq.{max (succ u2) (succ u1)} (α -> β) f' (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f)), Eq.{max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} α β rα rβ) (NonUnitalRingHom.copy.{u2, u1} α β rα rβ f f' h) f
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.copy_eq NonUnitalRingHom.copy_eqₓ'. -/
 theorem copy_eq (f : α →ₙ+* β) (f' : α → β) (h : f' = f) : f.copy f' h = f :=
   FunLike.ext' h
@@ -260,7 +260,7 @@ variable (f : α →ₙ+* β) {x y : α} {rα rβ}
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonUnitalNonAssocSemiring.{u1} α} {rβ : NonUnitalNonAssocSemiring.{u2} β} {{f : NonUnitalRingHom.{u1, u2} α β rα rβ}} {{g : NonUnitalRingHom.{u1, u2} α β rα rβ}}, (forall (x : α), Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f x) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) g x)) -> (Eq.{max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) f g)
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonUnitalNonAssocSemiring.{u2} α} {rβ : NonUnitalNonAssocSemiring.{u1} β} {{f : NonUnitalRingHom.{u2, u1} α β rα rβ}} {{g : NonUnitalRingHom.{u2, u1} α β rα rβ}}, (forall (x : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) g x)) -> (Eq.{max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} α β rα rβ) f g)
+  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β] {{f : NonUnitalRingHom.{u2, u1} α β rα rβ}} {{g : NonUnitalRingHom.{u2, u1} α β rα rβ}}, (forall (x : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) g x)) -> (Eq.{max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} α β rα rβ) f g)
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.ext NonUnitalRingHom.extₓ'. -/
 @[ext]
 theorem ext ⦃f g : α →ₙ+* β⦄ : (∀ x, f x = g x) → f = g :=
@@ -271,7 +271,7 @@ theorem ext ⦃f g : α →ₙ+* β⦄ : (∀ x, f x = g x) → f = g :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonUnitalNonAssocSemiring.{u1} α} {rβ : NonUnitalNonAssocSemiring.{u2} β} {f : NonUnitalRingHom.{u1, u2} α β rα rβ} {g : NonUnitalRingHom.{u1, u2} α β rα rβ}, Iff (Eq.{max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) f g) (forall (x : α), Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f x) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) g x))
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonUnitalNonAssocSemiring.{u2} α} {rβ : NonUnitalNonAssocSemiring.{u1} β} {f : NonUnitalRingHom.{u2, u1} α β rα rβ} {g : NonUnitalRingHom.{u2, u1} α β rα rβ}, Iff (Eq.{max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} α β rα rβ) f g) (forall (x : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) g x))
+  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β] {f : NonUnitalRingHom.{u2, u1} α β rα rβ} {g : NonUnitalRingHom.{u2, u1} α β rα rβ}, Iff (Eq.{max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} α β rα rβ) f g) (forall (x : α), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) g x))
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.ext_iff NonUnitalRingHom.ext_iffₓ'. -/
 theorem ext_iff {f g : α →ₙ+* β} : f = g ↔ ∀ x, f x = g x :=
   FunLike.ext_iff
@@ -281,7 +281,7 @@ theorem ext_iff {f g : α →ₙ+* β} : f = g ↔ ∀ x, f x = g x :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonUnitalNonAssocSemiring.{u1} α} {rβ : NonUnitalNonAssocSemiring.{u2} β} (f : NonUnitalRingHom.{u1, u2} α β rα rβ) (h₁ : forall (x : α) (y : α), Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f (HMul.hMul.{u1, u1, u1} α α α (instHMul.{u1} α (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα))) x y)) (HMul.hMul.{u2, u2, u2} β β β (instHMul.{u2} β (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f x) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f y))) (h₂ : Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f (OfNat.ofNat.{u1} α 0 (OfNat.mk.{u1} α 0 (Zero.zero.{u1} α (AddZeroClass.toHasZero.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα)))))))) (OfNat.ofNat.{u2} β 0 (OfNat.mk.{u2} β 0 (Zero.zero.{u2} β (AddZeroClass.toHasZero.{u2} β (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))))))) (h₃ : forall (x : α) (y : α), Eq.{succ u2} β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f (HAdd.hAdd.{u1, u1, u1} α α α (instHAdd.{u1} α (AddZeroClass.toHasAdd.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))))) x y)) (HAdd.hAdd.{u2, u2, u2} β β β (instHAdd.{u2} β (AddZeroClass.toHasAdd.{u2} β (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))))) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f x) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f y))), Eq.{max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (NonUnitalRingHom.mk.{u1, u2} α β rα rβ (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f) h₁ h₂ h₃) f
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonUnitalNonAssocSemiring.{u2} α} {rβ : NonUnitalNonAssocSemiring.{u1} β} (f : NonUnitalRingHom.{u2, u1} α β rα rβ) (h₁ : forall (x : α) (y : α), Eq.{succ u1} β (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f (HMul.hMul.{u2, u2, u2} α α α (instHMul.{u2} α (NonUnitalNonAssocSemiring.toMul.{u2} α rα)) x y)) (HMul.hMul.{u1, u1, u1} β β β (instHMul.{u1} β (NonUnitalNonAssocSemiring.toMul.{u1} β rβ)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f y))) (h₂ : Eq.{succ u1} β (MulHom.toFun.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (MulHom.mk.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f) h₁) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (AddZeroClass.toZero.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))))))) (OfNat.ofNat.{u1} β 0 (Zero.toOfNat0.{u1} β (AddZeroClass.toZero.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ))))))) (h₃ : forall (x : α) (y : α), Eq.{succ u1} β (MulHom.toFun.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (MulHom.mk.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f) h₁) (HAdd.hAdd.{u2, u2, u2} α α α (instHAdd.{u2} α (AddZeroClass.toAdd.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))))) x y)) (HAdd.hAdd.{u1, u1, u1} β β β (instHAdd.{u1} β (AddZeroClass.toAdd.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ))))) (MulHom.toFun.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (MulHom.mk.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f) h₁) x) (MulHom.toFun.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (MulHom.mk.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f) h₁) y))), Eq.{max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} α β rα rβ) (NonUnitalRingHom.mk.{u2, u1} α β rα rβ (MulHom.mk.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f) h₁) h₂ h₃) f
+  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β] (f : NonUnitalRingHom.{u2, u1} α β rα rβ) (h₁ : forall (x : α) (y : α), Eq.{succ u1} β (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f (HMul.hMul.{u2, u2, u2} α α α (instHMul.{u2} α (NonUnitalNonAssocSemiring.toMul.{u2} α rα)) x y)) (HMul.hMul.{u1, u1, u1} β β β (instHMul.{u1} β (NonUnitalNonAssocSemiring.toMul.{u1} β rβ)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f y))) (h₂ : Eq.{succ u1} β (MulHom.toFun.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (MulHom.mk.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f) h₁) (OfNat.ofNat.{u2} α 0 (Zero.toOfNat0.{u2} α (AddZeroClass.toZero.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))))))) (OfNat.ofNat.{u1} β 0 (Zero.toOfNat0.{u1} β (AddZeroClass.toZero.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ))))))) (h₃ : forall (x : α) (y : α), Eq.{succ u1} β (MulHom.toFun.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (MulHom.mk.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f) h₁) (HAdd.hAdd.{u2, u2, u2} α α α (instHAdd.{u2} α (AddZeroClass.toAdd.{u2} α (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))))) x y)) (HAdd.hAdd.{u1, u1, u1} β β β (instHAdd.{u1} β (AddZeroClass.toAdd.{u1} β (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ))))) (MulHom.toFun.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (MulHom.mk.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f) h₁) x) (MulHom.toFun.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (MulHom.mk.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f) h₁) y))), Eq.{max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} α β rα rβ) (NonUnitalRingHom.mk.{u2, u1} α β rα rβ (MulHom.mk.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ))) f) h₁) h₂ h₃) f
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.mk_coe NonUnitalRingHom.mk_coeₓ'. -/
 @[simp]
 theorem mk_coe (f : α →ₙ+* β) (h₁ h₂ h₃) : NonUnitalRingHom.mk f h₁ h₂ h₃ = f :=
@@ -292,7 +292,7 @@ theorem mk_coe (f : α →ₙ+* β) (h₁ h₂ h₃) : NonUnitalRingHom.mk f h
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonUnitalNonAssocSemiring.{u1} α} {rβ : NonUnitalNonAssocSemiring.{u2} β}, Function.Injective.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (AddMonoidHom.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) ((fun (a : Sort.{max (succ u1) (succ u2)}) (b : Sort.{max (succ u2) (succ u1)}) [self : HasLiftT.{max (succ u1) (succ u2), max (succ u2) (succ u1)} a b] => self.0) (NonUnitalRingHom.{u1, u2} α β rα rβ) (AddMonoidHom.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) (HasLiftT.mk.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (AddMonoidHom.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) (CoeTCₓ.coe.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (AddMonoidHom.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) (AddMonoidHom.hasCoeT.{u1, u2, max u1 u2} α β (NonUnitalRingHom.{u1, u2} α β rα rβ) (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))) (NonUnitalRingHomClass.toAddMonoidHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β rα rβ (NonUnitalRingHom.nonUnitalRingHomClass.{u1, u2} α β rα rβ))))))
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonUnitalNonAssocSemiring.{u2} α} {rβ : NonUnitalNonAssocSemiring.{u1} β}, Function.Injective.{max (succ u2) (succ u1), max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} α β rα rβ) (AddMonoidHom.{u2, u1} α β (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ)))) (fun (f : NonUnitalRingHom.{u2, u1} α β rα rβ) => AddMonoidHomClass.toAddMonoidHom.{u2, u1, max u2 u1} α β (NonUnitalRingHom.{u2, u1} α β rα rβ) (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ))) (NonUnitalRingHomClass.toAddMonoidHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ)) f)
+  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β], Function.Injective.{max (succ u2) (succ u1), max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} α β rα rβ) (AddMonoidHom.{u2, u1} α β (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ)))) (fun (f : NonUnitalRingHom.{u2, u1} α β rα rβ) => AddMonoidHomClass.toAddMonoidHom.{u2, u1, max u2 u1} α β (NonUnitalRingHom.{u2, u1} α β rα rβ) (AddMonoid.toAddZeroClass.{u2} α (AddCommMonoid.toAddMonoid.{u2} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} α rα))) (AddMonoid.toAddZeroClass.{u1} β (AddCommMonoid.toAddMonoid.{u1} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} β rβ))) (NonUnitalRingHomClass.toAddMonoidHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ)) f)
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.coe_add_monoid_hom_injective NonUnitalRingHom.coe_addMonoidHom_injectiveₓ'. -/
 theorem coe_addMonoidHom_injective : Injective (coe : (α →ₙ+* β) → α →+ β) := fun f g h =>
   ext <| AddMonoidHom.congr_fun h
@@ -302,7 +302,7 @@ theorem coe_addMonoidHom_injective : Injective (coe : (α →ₙ+* β) → α 
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {rα : NonUnitalNonAssocSemiring.{u1} α} {rβ : NonUnitalNonAssocSemiring.{u2} β}, Function.Injective.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (MulHom.{u1, u2} α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) ((fun (a : Sort.{max (succ u1) (succ u2)}) (b : Sort.{max (succ u2) (succ u1)}) [self : HasLiftT.{max (succ u1) (succ u2), max (succ u2) (succ u1)} a b] => self.0) (NonUnitalRingHom.{u1, u2} α β rα rβ) (MulHom.{u1, u2} α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) (HasLiftT.mk.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (MulHom.{u1, u2} α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) (CoeTCₓ.coe.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (MulHom.{u1, u2} α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) (MulHom.hasCoeT.{u1, u2, max u1 u2} α β (NonUnitalRingHom.{u1, u2} α β rα rβ) (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β rα rβ (NonUnitalRingHom.nonUnitalRingHomClass.{u1, u2} α β rα rβ))))))
 but is expected to have type
-  forall {α : Type.{u2}} {β : Type.{u1}} {rα : NonUnitalNonAssocSemiring.{u2} α} {rβ : NonUnitalNonAssocSemiring.{u1} β}, Function.Injective.{max (succ u2) (succ u1), max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} α β rα rβ) (MulHom.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ)) (fun (f : NonUnitalRingHom.{u2, u1} α β rα rβ) => MulHomClass.toMulHom.{u2, u1, max u2 u1} α β (NonUnitalRingHom.{u2, u1} α β rα rβ) (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ)) f)
+  forall {α : Type.{u2}} {β : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u2} α] [rβ : NonUnitalNonAssocSemiring.{u1} β], Function.Injective.{max (succ u2) (succ u1), max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} α β rα rβ) (MulHom.{u2, u1} α β (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ)) (fun (f : NonUnitalRingHom.{u2, u1} α β rα rβ) => MulHomClass.toMulHom.{u2, u1, max u2 u1} α β (NonUnitalRingHom.{u2, u1} α β rα rβ) (NonUnitalNonAssocSemiring.toMul.{u2} α rα) (NonUnitalNonAssocSemiring.toMul.{u1} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} α β rα rβ)) f)
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.coe_mul_hom_injective NonUnitalRingHom.coe_mulHom_injectiveₓ'. -/
 theorem coe_mulHom_injective : Injective (coe : (α →ₙ+* β) → α →ₙ* β) := fun f g h =>
   ext <| MulHom.congr_fun h
@@ -400,7 +400,7 @@ def comp (g : β →ₙ+* γ) (f : α →ₙ+* β) : α →ₙ+* γ :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {γ : Type.{u3}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] {rγ : NonUnitalNonAssocSemiring.{u3} γ} {δ : Type.{u4}} {rδ : NonUnitalNonAssocSemiring.{u4} δ} (f : NonUnitalRingHom.{u1, u2} α β rα rβ) (g : NonUnitalRingHom.{u2, u3} β γ rβ rγ) (h : NonUnitalRingHom.{u3, u4} γ δ rγ rδ), Eq.{max (succ u1) (succ u4)} (NonUnitalRingHom.{u1, u4} α δ rα rδ) (NonUnitalRingHom.comp.{u1, u2, u4} α β δ rα rβ rδ (NonUnitalRingHom.comp.{u2, u3, u4} β γ δ rβ rγ rδ h g) f) (NonUnitalRingHom.comp.{u1, u3, u4} α γ δ rα rγ rδ h (NonUnitalRingHom.comp.{u1, u2, u3} α β γ rα rβ rγ g f))
 but is expected to have type
-  forall {α : Type.{u3}} {β : Type.{u2}} {γ : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u3} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] {rγ : NonUnitalNonAssocSemiring.{u1} γ} {δ : Type.{u4}} {rδ : NonUnitalNonAssocSemiring.{u4} δ} (f : NonUnitalRingHom.{u3, u2} α β rα rβ) (g : NonUnitalRingHom.{u2, u1} β γ rβ rγ) (h : NonUnitalRingHom.{u1, u4} γ δ rγ rδ), Eq.{max (succ u3) (succ u4)} (NonUnitalRingHom.{u3, u4} α δ rα rδ) (NonUnitalRingHom.comp.{u3, u2, u4} α β δ rα rβ rδ (NonUnitalRingHom.comp.{u2, u1, u4} β γ δ rβ rγ rδ h g) f) (NonUnitalRingHom.comp.{u3, u1, u4} α γ δ rα rγ rδ h (NonUnitalRingHom.comp.{u3, u2, u1} α β γ rα rβ rγ g f))
+  forall {α : Type.{u3}} {β : Type.{u2}} {γ : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u3} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] [rγ : NonUnitalNonAssocSemiring.{u1} γ] {δ : Type.{u4}} {rδ : NonUnitalNonAssocSemiring.{u4} δ} (f : NonUnitalRingHom.{u3, u2} α β rα rβ) (g : NonUnitalRingHom.{u2, u1} β γ rβ rγ) (h : NonUnitalRingHom.{u1, u4} γ δ rγ rδ), Eq.{max (succ u3) (succ u4)} (NonUnitalRingHom.{u3, u4} α δ rα rδ) (NonUnitalRingHom.comp.{u3, u2, u4} α β δ rα rβ rδ (NonUnitalRingHom.comp.{u2, u1, u4} β γ δ rβ rγ rδ h g) f) (NonUnitalRingHom.comp.{u3, u1, u4} α γ δ rα rγ rδ h (NonUnitalRingHom.comp.{u3, u2, u1} α β γ rα rβ rγ g f))
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.comp_assoc NonUnitalRingHom.comp_assocₓ'. -/
 /-- Composition of non-unital ring homomorphisms is associative. -/
 theorem comp_assoc {δ} {rδ : NonUnitalNonAssocSemiring δ} (f : α →ₙ+* β) (g : β →ₙ+* γ)
@@ -412,7 +412,7 @@ theorem comp_assoc {δ} {rδ : NonUnitalNonAssocSemiring δ} (f : α →ₙ+* β
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {γ : Type.{u3}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] {rγ : NonUnitalNonAssocSemiring.{u3} γ} (g : NonUnitalRingHom.{u2, u3} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u2} α β rα rβ), Eq.{max (succ u1) (succ u3)} (α -> γ) (coeFn.{max (succ u1) (succ u3), max (succ u1) (succ u3)} (NonUnitalRingHom.{u1, u3} α γ rα rγ) (fun (_x : NonUnitalRingHom.{u1, u3} α γ rα rγ) => α -> γ) (NonUnitalRingHom.hasCoeToFun.{u1, u3} α γ rα rγ) (NonUnitalRingHom.comp.{u1, u2, u3} α β γ rα rβ rγ g f)) (Function.comp.{succ u1, succ u2, succ u3} α β γ (coeFn.{max (succ u2) (succ u3), max (succ u2) (succ u3)} (NonUnitalRingHom.{u2, u3} β γ rβ rγ) (fun (_x : NonUnitalRingHom.{u2, u3} β γ rβ rγ) => β -> γ) (NonUnitalRingHom.hasCoeToFun.{u2, u3} β γ rβ rγ) g) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] {rγ : NonUnitalNonAssocSemiring.{u2} γ} (g : NonUnitalRingHom.{u3, u2} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u3} α β rα rβ), Eq.{max (succ u1) (succ u2)} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => γ) ᾰ) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => γ) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α γ rα rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} α γ rα rγ))) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f)) (Function.comp.{succ u1, succ u3, succ u2} α β γ (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : β) => γ) _x) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ))) g) (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ))) f))
+  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] [rγ : NonUnitalNonAssocSemiring.{u2} γ] (g : NonUnitalRingHom.{u3, u2} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u3} α β rα rβ), Eq.{max (succ u1) (succ u2)} (forall (ᾰ : α), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => γ) ᾰ) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => γ) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α γ rα rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} α γ rα rγ))) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f)) (Function.comp.{succ u1, succ u3, succ u2} α β γ (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : β) => γ) _x) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ))) g) (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ))) f))
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.coe_comp NonUnitalRingHom.coe_compₓ'. -/
 @[simp]
 theorem coe_comp (g : β →ₙ+* γ) (f : α →ₙ+* β) : ⇑(g.comp f) = g ∘ f :=
@@ -423,7 +423,7 @@ theorem coe_comp (g : β →ₙ+* γ) (f : α →ₙ+* β) : ⇑(g.comp f) = g 
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {γ : Type.{u3}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] {rγ : NonUnitalNonAssocSemiring.{u3} γ} (g : NonUnitalRingHom.{u2, u3} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u2} α β rα rβ) (x : α), Eq.{succ u3} γ (coeFn.{max (succ u1) (succ u3), max (succ u1) (succ u3)} (NonUnitalRingHom.{u1, u3} α γ rα rγ) (fun (_x : NonUnitalRingHom.{u1, u3} α γ rα rγ) => α -> γ) (NonUnitalRingHom.hasCoeToFun.{u1, u3} α γ rα rγ) (NonUnitalRingHom.comp.{u1, u2, u3} α β γ rα rβ rγ g f) x) (coeFn.{max (succ u2) (succ u3), max (succ u2) (succ u3)} (NonUnitalRingHom.{u2, u3} β γ rβ rγ) (fun (_x : NonUnitalRingHom.{u2, u3} β γ rβ rγ) => β -> γ) (NonUnitalRingHom.hasCoeToFun.{u2, u3} β γ rβ rγ) g (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f x))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] {rγ : NonUnitalNonAssocSemiring.{u2} γ} (g : NonUnitalRingHom.{u3, u2} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u3} α β rα rβ) (x : α), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => γ) x) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => γ) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α γ rα rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} α γ rα rγ))) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f) x) (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : β) => γ) _x) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ))) g (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ))) f x))
+  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] [rγ : NonUnitalNonAssocSemiring.{u2} γ] (g : NonUnitalRingHom.{u3, u2} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u3} α β rα rβ) (x : α), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => γ) x) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => γ) _x) (MulHomClass.toFunLike.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) α γ rα rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} α γ rα rγ))) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f) x) (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : β) => γ) _x) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ))) g (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ))) f x))
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.comp_apply NonUnitalRingHom.comp_applyₓ'. -/
 @[simp]
 theorem comp_apply (g : β →ₙ+* γ) (f : α →ₙ+* β) (x : α) : g.comp f x = g (f x) :=
@@ -434,7 +434,7 @@ theorem comp_apply (g : β →ₙ+* γ) (f : α →ₙ+* β) (x : α) : g.comp f
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {γ : Type.{u3}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] {rγ : NonUnitalNonAssocSemiring.{u3} γ} (g : NonUnitalRingHom.{u2, u3} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u2} α β rα rβ), Eq.{max (succ u3) (succ u1)} (AddMonoidHom.{u1, u3} α γ (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u3} γ (AddCommMonoid.toAddMonoid.{u3} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} γ rγ)))) ((fun (a : Sort.{max (succ u1) (succ u3)}) (b : Sort.{max (succ u3) (succ u1)}) [self : HasLiftT.{max (succ u1) (succ u3), max (succ u3) (succ u1)} a b] => self.0) (NonUnitalRingHom.{u1, u3} α γ rα rγ) (AddMonoidHom.{u1, u3} α γ (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u3} γ (AddCommMonoid.toAddMonoid.{u3} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} γ rγ)))) (HasLiftT.mk.{max (succ u1) (succ u3), max (succ u3) (succ u1)} (NonUnitalRingHom.{u1, u3} α γ rα rγ) (AddMonoidHom.{u1, u3} α γ (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u3} γ (AddCommMonoid.toAddMonoid.{u3} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} γ rγ)))) (CoeTCₓ.coe.{max (succ u1) (succ u3), max (succ u3) (succ u1)} (NonUnitalRingHom.{u1, u3} α γ rα rγ) (AddMonoidHom.{u1, u3} α γ (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u3} γ (AddCommMonoid.toAddMonoid.{u3} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} γ rγ)))) (AddMonoidHom.hasCoeT.{u1, u3, max u1 u3} α γ (NonUnitalRingHom.{u1, u3} α γ rα rγ) (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u3} γ (AddCommMonoid.toAddMonoid.{u3} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} γ rγ))) (NonUnitalRingHomClass.toAddMonoidHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α γ rα rγ) α γ rα rγ (NonUnitalRingHom.nonUnitalRingHomClass.{u1, u3} α γ rα rγ))))) (NonUnitalRingHom.comp.{u1, u2, u3} α β γ rα rβ rγ g f)) (AddMonoidHom.comp.{u1, u2, u3} α β γ (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))) (AddMonoid.toAddZeroClass.{u3} γ (AddCommMonoid.toAddMonoid.{u3} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} γ rγ))) ((fun (a : Sort.{max (succ u2) (succ u3)}) (b : Sort.{max (succ u3) (succ u2)}) [self : HasLiftT.{max (succ u2) (succ u3), max (succ u3) (succ u2)} a b] => self.0) (NonUnitalRingHom.{u2, u3} β γ rβ rγ) (AddMonoidHom.{u2, u3} β γ (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))) (AddMonoid.toAddZeroClass.{u3} γ (AddCommMonoid.toAddMonoid.{u3} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} γ rγ)))) (HasLiftT.mk.{max (succ u2) (succ u3), max (succ u3) (succ u2)} (NonUnitalRingHom.{u2, u3} β γ rβ rγ) (AddMonoidHom.{u2, u3} β γ (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))) (AddMonoid.toAddZeroClass.{u3} γ (AddCommMonoid.toAddMonoid.{u3} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} γ rγ)))) (CoeTCₓ.coe.{max (succ u2) (succ u3), max (succ u3) (succ u2)} (NonUnitalRingHom.{u2, u3} β γ rβ rγ) (AddMonoidHom.{u2, u3} β γ (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))) (AddMonoid.toAddZeroClass.{u3} γ (AddCommMonoid.toAddMonoid.{u3} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} γ rγ)))) (AddMonoidHom.hasCoeT.{u2, u3, max u2 u3} β γ (NonUnitalRingHom.{u2, u3} β γ rβ rγ) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))) (AddMonoid.toAddZeroClass.{u3} γ (AddCommMonoid.toAddMonoid.{u3} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} γ rγ))) (NonUnitalRingHomClass.toAddMonoidHomClass.{max u2 u3, u2, u3} (NonUnitalRingHom.{u2, u3} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.nonUnitalRingHomClass.{u2, u3} β γ rβ rγ))))) g) ((fun (a : Sort.{max (succ u1) (succ u2)}) (b : Sort.{max (succ u2) (succ u1)}) [self : HasLiftT.{max (succ u1) (succ u2), max (succ u2) (succ u1)} a b] => self.0) (NonUnitalRingHom.{u1, u2} α β rα rβ) (AddMonoidHom.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) (HasLiftT.mk.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (AddMonoidHom.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) (CoeTCₓ.coe.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (AddMonoidHom.{u1, u2} α β (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ)))) (AddMonoidHom.hasCoeT.{u1, u2, max u1 u2} α β (NonUnitalRingHom.{u1, u2} α β rα rβ) (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} β (AddCommMonoid.toAddMonoid.{u2} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} β rβ))) (NonUnitalRingHomClass.toAddMonoidHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β rα rβ (NonUnitalRingHom.nonUnitalRingHomClass.{u1, u2} α β rα rβ))))) f))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] {rγ : NonUnitalNonAssocSemiring.{u2} γ} (g : NonUnitalRingHom.{u3, u2} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u3} α β rα rβ), Eq.{max (succ u1) (succ u2)} (AddMonoidHom.{u1, u2} α γ (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} γ (AddCommMonoid.toAddMonoid.{u2} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} γ rγ)))) (AddMonoidHom.mk.{u1, u2} α γ (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} γ (AddCommMonoid.toAddMonoid.{u2} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} γ rγ))) (ZeroHom.mk.{u1, u2} α γ (AddZeroClass.toZero.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα)))) (AddZeroClass.toZero.{u2} γ (AddMonoid.toAddZeroClass.{u2} γ (AddCommMonoid.toAddMonoid.{u2} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} γ rγ)))) (Function.comp.{succ u1, succ u3, succ u2} α β γ (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β (fun (a : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : β) => γ) a) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ))) g) (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ))) f)) (NonUnitalRingHom.map_zero'.{u1, u2} α γ rα rγ (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f))) (NonUnitalRingHom.map_add'.{u1, u2} α γ rα rγ (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f))) (AddMonoidHom.comp.{u1, u3, u2} α β γ (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u3} β (AddCommMonoid.toAddMonoid.{u3} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} β rβ))) (AddMonoid.toAddZeroClass.{u2} γ (AddCommMonoid.toAddMonoid.{u2} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} γ rγ))) (AddMonoidHomClass.toAddMonoidHom.{u3, u2, max u3 u2} β γ (NonUnitalRingHom.{u3, u2} β γ rβ rγ) (AddMonoid.toAddZeroClass.{u3} β (AddCommMonoid.toAddMonoid.{u3} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} β rβ))) (AddMonoid.toAddZeroClass.{u2} γ (AddCommMonoid.toAddMonoid.{u2} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} γ rγ))) (NonUnitalRingHomClass.toAddMonoidHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ)) g) (AddMonoidHomClass.toAddMonoidHom.{u1, u3, max u1 u3} α β (NonUnitalRingHom.{u1, u3} α β rα rβ) (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u3} β (AddCommMonoid.toAddMonoid.{u3} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} β rβ))) (NonUnitalRingHomClass.toAddMonoidHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ)) f))
+  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] [rγ : NonUnitalNonAssocSemiring.{u2} γ] (g : NonUnitalRingHom.{u3, u2} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u3} α β rα rβ), Eq.{max (succ u1) (succ u2)} (AddMonoidHom.{u1, u2} α γ (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} γ (AddCommMonoid.toAddMonoid.{u2} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} γ rγ)))) (AddMonoidHom.mk.{u1, u2} α γ (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u2} γ (AddCommMonoid.toAddMonoid.{u2} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} γ rγ))) (ZeroHom.mk.{u1, u2} α γ (AddZeroClass.toZero.{u1} α (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα)))) (AddZeroClass.toZero.{u2} γ (AddMonoid.toAddZeroClass.{u2} γ (AddCommMonoid.toAddMonoid.{u2} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} γ rγ)))) (Function.comp.{succ u1, succ u3, succ u2} α β γ (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β (fun (a : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : β) => γ) a) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ))) g) (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ))) f)) (NonUnitalRingHom.map_zero'.{u1, u2} α γ rα rγ (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f))) (NonUnitalRingHom.map_add'.{u1, u2} α γ rα rγ (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f))) (AddMonoidHom.comp.{u1, u3, u2} α β γ (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u3} β (AddCommMonoid.toAddMonoid.{u3} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} β rβ))) (AddMonoid.toAddZeroClass.{u2} γ (AddCommMonoid.toAddMonoid.{u2} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} γ rγ))) (AddMonoidHomClass.toAddMonoidHom.{u3, u2, max u3 u2} β γ (NonUnitalRingHom.{u3, u2} β γ rβ rγ) (AddMonoid.toAddZeroClass.{u3} β (AddCommMonoid.toAddMonoid.{u3} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} β rβ))) (AddMonoid.toAddZeroClass.{u2} γ (AddCommMonoid.toAddMonoid.{u2} γ (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} γ rγ))) (NonUnitalRingHomClass.toAddMonoidHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ)) g) (AddMonoidHomClass.toAddMonoidHom.{u1, u3, max u1 u3} α β (NonUnitalRingHom.{u1, u3} α β rα rβ) (AddMonoid.toAddZeroClass.{u1} α (AddCommMonoid.toAddMonoid.{u1} α (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} α rα))) (AddMonoid.toAddZeroClass.{u3} β (AddCommMonoid.toAddMonoid.{u3} β (NonUnitalNonAssocSemiring.toAddCommMonoid.{u3} β rβ))) (NonUnitalRingHomClass.toAddMonoidHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ)) f))
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.coe_comp_add_monoid_hom NonUnitalRingHom.coe_comp_addMonoidHomₓ'. -/
 @[simp]
 theorem coe_comp_addMonoidHom (g : β →ₙ+* γ) (f : α →ₙ+* β) :
@@ -446,7 +446,7 @@ theorem coe_comp_addMonoidHom (g : β →ₙ+* γ) (f : α →ₙ+* β) :
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {γ : Type.{u3}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] {rγ : NonUnitalNonAssocSemiring.{u3} γ} (g : NonUnitalRingHom.{u2, u3} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u2} α β rα rβ), Eq.{max (succ u3) (succ u1)} (MulHom.{u1, u3} α γ (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u3} γ (NonUnitalNonAssocSemiring.toDistrib.{u3} γ rγ))) ((fun (a : Sort.{max (succ u1) (succ u3)}) (b : Sort.{max (succ u3) (succ u1)}) [self : HasLiftT.{max (succ u1) (succ u3), max (succ u3) (succ u1)} a b] => self.0) (NonUnitalRingHom.{u1, u3} α γ rα rγ) (MulHom.{u1, u3} α γ (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u3} γ (NonUnitalNonAssocSemiring.toDistrib.{u3} γ rγ))) (HasLiftT.mk.{max (succ u1) (succ u3), max (succ u3) (succ u1)} (NonUnitalRingHom.{u1, u3} α γ rα rγ) (MulHom.{u1, u3} α γ (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u3} γ (NonUnitalNonAssocSemiring.toDistrib.{u3} γ rγ))) (CoeTCₓ.coe.{max (succ u1) (succ u3), max (succ u3) (succ u1)} (NonUnitalRingHom.{u1, u3} α γ rα rγ) (MulHom.{u1, u3} α γ (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u3} γ (NonUnitalNonAssocSemiring.toDistrib.{u3} γ rγ))) (MulHom.hasCoeT.{u1, u3, max u1 u3} α γ (NonUnitalRingHom.{u1, u3} α γ rα rγ) (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u3} γ (NonUnitalNonAssocSemiring.toDistrib.{u3} γ rγ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α γ rα rγ) α γ rα rγ (NonUnitalRingHom.nonUnitalRingHomClass.{u1, u3} α γ rα rγ))))) (NonUnitalRingHom.comp.{u1, u2, u3} α β γ rα rβ rγ g f)) (MulHom.comp.{u1, u2, u3} α β γ (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ)) (Distrib.toHasMul.{u3} γ (NonUnitalNonAssocSemiring.toDistrib.{u3} γ rγ)) ((fun (a : Sort.{max (succ u2) (succ u3)}) (b : Sort.{max (succ u3) (succ u2)}) [self : HasLiftT.{max (succ u2) (succ u3), max (succ u3) (succ u2)} a b] => self.0) (NonUnitalRingHom.{u2, u3} β γ rβ rγ) (MulHom.{u2, u3} β γ (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ)) (Distrib.toHasMul.{u3} γ (NonUnitalNonAssocSemiring.toDistrib.{u3} γ rγ))) (HasLiftT.mk.{max (succ u2) (succ u3), max (succ u3) (succ u2)} (NonUnitalRingHom.{u2, u3} β γ rβ rγ) (MulHom.{u2, u3} β γ (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ)) (Distrib.toHasMul.{u3} γ (NonUnitalNonAssocSemiring.toDistrib.{u3} γ rγ))) (CoeTCₓ.coe.{max (succ u2) (succ u3), max (succ u3) (succ u2)} (NonUnitalRingHom.{u2, u3} β γ rβ rγ) (MulHom.{u2, u3} β γ (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ)) (Distrib.toHasMul.{u3} γ (NonUnitalNonAssocSemiring.toDistrib.{u3} γ rγ))) (MulHom.hasCoeT.{u2, u3, max u2 u3} β γ (NonUnitalRingHom.{u2, u3} β γ rβ rγ) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ)) (Distrib.toHasMul.{u3} γ (NonUnitalNonAssocSemiring.toDistrib.{u3} γ rγ)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u3, u2, u3} (NonUnitalRingHom.{u2, u3} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.nonUnitalRingHomClass.{u2, u3} β γ rβ rγ))))) g) ((fun (a : Sort.{max (succ u1) (succ u2)}) (b : Sort.{max (succ u2) (succ u1)}) [self : HasLiftT.{max (succ u1) (succ u2), max (succ u2) (succ u1)} a b] => self.0) (NonUnitalRingHom.{u1, u2} α β rα rβ) (MulHom.{u1, u2} α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) (HasLiftT.mk.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (MulHom.{u1, u2} α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) (CoeTCₓ.coe.{max (succ u1) (succ u2), max (succ u2) (succ u1)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (MulHom.{u1, u2} α β (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ))) (MulHom.hasCoeT.{u1, u2, max u1 u2} α β (NonUnitalRingHom.{u1, u2} α β rα rβ) (Distrib.toHasMul.{u1} α (NonUnitalNonAssocSemiring.toDistrib.{u1} α rα)) (Distrib.toHasMul.{u2} β (NonUnitalNonAssocSemiring.toDistrib.{u2} β rβ)) (NonUnitalRingHomClass.toMulHomClass.{max u1 u2, u1, u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) α β rα rβ (NonUnitalRingHom.nonUnitalRingHomClass.{u1, u2} α β rα rβ))))) f))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] {rγ : NonUnitalNonAssocSemiring.{u2} γ} (g : NonUnitalRingHom.{u3, u2} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u3} α β rα rβ), Eq.{max (succ u1) (succ u2)} (MulHom.{u1, u2} α γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ)) (MulHom.mk.{u1, u2} α γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (Function.comp.{succ u1, succ u3, succ u2} α β γ (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β (fun (a : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : β) => γ) a) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ))) g) (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ))) f)) (MulHom.map_mul'.{u1, u2} α γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHom.toMulHom.{u1, u2} α γ rα rγ (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f)))) (MulHom.comp.{u1, u3, u2} α β γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (MulHomClass.toMulHom.{u3, u2, max u3 u2} β γ (NonUnitalRingHom.{u3, u2} β γ rβ rγ) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ)) g) (MulHomClass.toMulHom.{u1, u3, max u1 u3} α β (NonUnitalRingHom.{u1, u3} α β rα rβ) (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ)) f))
+  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] [rγ : NonUnitalNonAssocSemiring.{u2} γ] (g : NonUnitalRingHom.{u3, u2} β γ rβ rγ) (f : NonUnitalRingHom.{u1, u3} α β rα rβ), Eq.{max (succ u1) (succ u2)} (MulHom.{u1, u2} α γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ)) (MulHom.mk.{u1, u2} α γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (Function.comp.{succ u1, succ u3, succ u2} α β γ (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β (fun (a : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : β) => γ) a) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ))) g) (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α (fun (a : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) a) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ))) f)) (MulHom.map_mul'.{u1, u2} α γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHom.toMulHom.{u1, u2} α γ rα rγ (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f)))) (MulHom.comp.{u1, u3, u2} α β γ (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (MulHomClass.toMulHom.{u3, u2, max u3 u2} β γ (NonUnitalRingHom.{u3, u2} β γ rβ rγ) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ)) g) (MulHomClass.toMulHom.{u1, u3, max u1 u3} α β (NonUnitalRingHom.{u1, u3} α β rα rβ) (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ)) f))
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.coe_comp_mul_hom NonUnitalRingHom.coe_comp_mulHomₓ'. -/
 @[simp]
 theorem coe_comp_mulHom (g : β →ₙ+* γ) (f : α →ₙ+* β) :
@@ -458,7 +458,7 @@ theorem coe_comp_mulHom (g : β →ₙ+* γ) (f : α →ₙ+* β) :
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {γ : Type.{u3}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] {rγ : NonUnitalNonAssocSemiring.{u3} γ} (g : NonUnitalRingHom.{u2, u3} β γ rβ rγ), Eq.{max (succ u1) (succ u3)} (NonUnitalRingHom.{u1, u3} α γ rα rγ) (NonUnitalRingHom.comp.{u1, u2, u3} α β γ rα rβ rγ g (OfNat.ofNat.{max u1 u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) 0 (OfNat.mk.{max u1 u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) 0 (Zero.zero.{max u1 u2} (NonUnitalRingHom.{u1, u2} α β rα rβ) (NonUnitalRingHom.hasZero.{u1, u2} α β rα rβ))))) (OfNat.ofNat.{max u1 u3} (NonUnitalRingHom.{u1, u3} α γ rα rγ) 0 (OfNat.mk.{max u1 u3} (NonUnitalRingHom.{u1, u3} α γ rα rγ) 0 (Zero.zero.{max u1 u3} (NonUnitalRingHom.{u1, u3} α γ rα rγ) (NonUnitalRingHom.hasZero.{u1, u3} α γ rα rγ))))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] {rγ : NonUnitalNonAssocSemiring.{u2} γ} (g : NonUnitalRingHom.{u3, u2} β γ rβ rγ), Eq.{max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α γ rα rγ) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g (OfNat.ofNat.{max u1 u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) 0 (Zero.toOfNat0.{max u1 u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) (NonUnitalRingHom.instZeroNonUnitalRingHom.{u1, u3} α β rα rβ)))) (OfNat.ofNat.{max u1 u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) 0 (Zero.toOfNat0.{max u1 u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) (NonUnitalRingHom.instZeroNonUnitalRingHom.{u1, u2} α γ rα rγ)))
+  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] [rγ : NonUnitalNonAssocSemiring.{u2} γ] (g : NonUnitalRingHom.{u3, u2} β γ rβ rγ), Eq.{max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α γ rα rγ) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g (OfNat.ofNat.{max u1 u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) 0 (Zero.toOfNat0.{max u1 u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) (NonUnitalRingHom.instZeroNonUnitalRingHom.{u1, u3} α β rα rβ)))) (OfNat.ofNat.{max u1 u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) 0 (Zero.toOfNat0.{max u1 u2} (NonUnitalRingHom.{u1, u2} α γ rα rγ) (NonUnitalRingHom.instZeroNonUnitalRingHom.{u1, u2} α γ rα rγ)))
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.comp_zero NonUnitalRingHom.comp_zeroₓ'. -/
 @[simp]
 theorem comp_zero (g : β →ₙ+* γ) : g.comp (0 : α →ₙ+* β) = 0 :=
@@ -471,7 +471,7 @@ theorem comp_zero (g : β →ₙ+* γ) : g.comp (0 : α →ₙ+* β) = 0 :=
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {γ : Type.{u3}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] {rγ : NonUnitalNonAssocSemiring.{u3} γ} (f : NonUnitalRingHom.{u1, u2} α β rα rβ), Eq.{max (succ u1) (succ u3)} (NonUnitalRingHom.{u1, u3} α γ rα rγ) (NonUnitalRingHom.comp.{u1, u2, u3} α β γ rα rβ rγ (OfNat.ofNat.{max u2 u3} (NonUnitalRingHom.{u2, u3} β γ rβ rγ) 0 (OfNat.mk.{max u2 u3} (NonUnitalRingHom.{u2, u3} β γ rβ rγ) 0 (Zero.zero.{max u2 u3} (NonUnitalRingHom.{u2, u3} β γ rβ rγ) (NonUnitalRingHom.hasZero.{u2, u3} β γ rβ rγ)))) f) (OfNat.ofNat.{max u1 u3} (NonUnitalRingHom.{u1, u3} α γ rα rγ) 0 (OfNat.mk.{max u1 u3} (NonUnitalRingHom.{u1, u3} α γ rα rγ) 0 (Zero.zero.{max u1 u3} (NonUnitalRingHom.{u1, u3} α γ rα rγ) (NonUnitalRingHom.hasZero.{u1, u3} α γ rα rγ))))
 but is expected to have type
-  forall {α : Type.{u3}} {β : Type.{u2}} {γ : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u3} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] {rγ : NonUnitalNonAssocSemiring.{u1} γ} (f : NonUnitalRingHom.{u3, u2} α β rα rβ), Eq.{max (succ u3) (succ u1)} (NonUnitalRingHom.{u3, u1} α γ rα rγ) (NonUnitalRingHom.comp.{u3, u2, u1} α β γ rα rβ rγ (OfNat.ofNat.{max u2 u1} (NonUnitalRingHom.{u2, u1} β γ rβ rγ) 0 (Zero.toOfNat0.{max u2 u1} (NonUnitalRingHom.{u2, u1} β γ rβ rγ) (NonUnitalRingHom.instZeroNonUnitalRingHom.{u2, u1} β γ rβ rγ))) f) (OfNat.ofNat.{max u3 u1} (NonUnitalRingHom.{u3, u1} α γ rα rγ) 0 (Zero.toOfNat0.{max u3 u1} (NonUnitalRingHom.{u3, u1} α γ rα rγ) (NonUnitalRingHom.instZeroNonUnitalRingHom.{u3, u1} α γ rα rγ)))
+  forall {α : Type.{u3}} {β : Type.{u2}} {γ : Type.{u1}} [rα : NonUnitalNonAssocSemiring.{u3} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] [rγ : NonUnitalNonAssocSemiring.{u1} γ] (f : NonUnitalRingHom.{u3, u2} α β rα rβ), Eq.{max (succ u3) (succ u1)} (NonUnitalRingHom.{u3, u1} α γ rα rγ) (NonUnitalRingHom.comp.{u3, u2, u1} α β γ rα rβ rγ (OfNat.ofNat.{max u2 u1} (NonUnitalRingHom.{u2, u1} β γ rβ rγ) 0 (Zero.toOfNat0.{max u2 u1} (NonUnitalRingHom.{u2, u1} β γ rβ rγ) (NonUnitalRingHom.instZeroNonUnitalRingHom.{u2, u1} β γ rβ rγ))) f) (OfNat.ofNat.{max u3 u1} (NonUnitalRingHom.{u3, u1} α γ rα rγ) 0 (Zero.toOfNat0.{max u3 u1} (NonUnitalRingHom.{u3, u1} α γ rα rγ) (NonUnitalRingHom.instZeroNonUnitalRingHom.{u3, u1} α γ rα rγ)))
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.zero_comp NonUnitalRingHom.zero_compₓ'. -/
 @[simp]
 theorem zero_comp (f : α →ₙ+* β) : (0 : β →ₙ+* γ).comp f = 0 :=
@@ -565,7 +565,7 @@ include rβ rγ
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {γ : Type.{u3}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] {rγ : NonUnitalNonAssocSemiring.{u3} γ} {g₁ : NonUnitalRingHom.{u2, u3} β γ rβ rγ} {g₂ : NonUnitalRingHom.{u2, u3} β γ rβ rγ} {f : NonUnitalRingHom.{u1, u2} α β rα rβ}, (Function.Surjective.{succ u1, succ u2} α β (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) (fun (_x : NonUnitalRingHom.{u1, u2} α β rα rβ) => α -> β) (NonUnitalRingHom.hasCoeToFun.{u1, u2} α β rα rβ) f)) -> (Iff (Eq.{max (succ u1) (succ u3)} (NonUnitalRingHom.{u1, u3} α γ rα rγ) (NonUnitalRingHom.comp.{u1, u2, u3} α β γ rα rβ rγ g₁ f) (NonUnitalRingHom.comp.{u1, u2, u3} α β γ rα rβ rγ g₂ f)) (Eq.{max (succ u2) (succ u3)} (NonUnitalRingHom.{u2, u3} β γ rβ rγ) g₁ g₂))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] {rγ : NonUnitalNonAssocSemiring.{u2} γ} {g₁ : NonUnitalRingHom.{u3, u2} β γ rβ rγ} {g₂ : NonUnitalRingHom.{u3, u2} β γ rβ rγ} {f : NonUnitalRingHom.{u1, u3} α β rα rβ}, (Function.Surjective.{succ u1, succ u3} α β (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ))) f)) -> (Iff (Eq.{max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α γ rα rγ) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g₁ f) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g₂ f)) (Eq.{max (succ u3) (succ u2)} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) g₁ g₂))
+  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] [rγ : NonUnitalNonAssocSemiring.{u2} γ] {g₁ : NonUnitalRingHom.{u3, u2} β γ rβ rγ} {g₂ : NonUnitalRingHom.{u3, u2} β γ rβ rγ} {f : NonUnitalRingHom.{u1, u3} α β rα rβ}, (Function.Surjective.{succ u1, succ u3} α β (FunLike.coe.{max (succ u1) (succ u3), succ u1, succ u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α (fun (_x : α) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : α) => β) _x) (MulHomClass.toFunLike.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β (NonUnitalNonAssocSemiring.toMul.{u1} α rα) (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalRingHomClass.toMulHomClass.{max u1 u3, u1, u3} (NonUnitalRingHom.{u1, u3} α β rα rβ) α β rα rβ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u3} α β rα rβ))) f)) -> (Iff (Eq.{max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α γ rα rγ) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g₁ f) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g₂ f)) (Eq.{max (succ u3) (succ u2)} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) g₁ g₂))
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.cancel_right NonUnitalRingHom.cancel_rightₓ'. -/
 theorem cancel_right {g₁ g₂ : β →ₙ+* γ} {f : α →ₙ+* β} (hf : Surjective f) :
     g₁.comp f = g₂.comp f ↔ g₁ = g₂ :=
@@ -576,7 +576,7 @@ theorem cancel_right {g₁ g₂ : β →ₙ+* γ} {f : α →ₙ+* β} (hf : Sur
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} {γ : Type.{u3}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u2} β] {rγ : NonUnitalNonAssocSemiring.{u3} γ} {g : NonUnitalRingHom.{u2, u3} β γ rβ rγ} {f₁ : NonUnitalRingHom.{u1, u2} α β rα rβ} {f₂ : NonUnitalRingHom.{u1, u2} α β rα rβ}, (Function.Injective.{succ u2, succ u3} β γ (coeFn.{max (succ u2) (succ u3), max (succ u2) (succ u3)} (NonUnitalRingHom.{u2, u3} β γ rβ rγ) (fun (_x : NonUnitalRingHom.{u2, u3} β γ rβ rγ) => β -> γ) (NonUnitalRingHom.hasCoeToFun.{u2, u3} β γ rβ rγ) g)) -> (Iff (Eq.{max (succ u1) (succ u3)} (NonUnitalRingHom.{u1, u3} α γ rα rγ) (NonUnitalRingHom.comp.{u1, u2, u3} α β γ rα rβ rγ g f₁) (NonUnitalRingHom.comp.{u1, u2, u3} α β γ rα rβ rγ g f₂)) (Eq.{max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α β rα rβ) f₁ f₂))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] {rγ : NonUnitalNonAssocSemiring.{u2} γ} {g : NonUnitalRingHom.{u3, u2} β γ rβ rγ} {f₁ : NonUnitalRingHom.{u1, u3} α β rα rβ} {f₂ : NonUnitalRingHom.{u1, u3} α β rα rβ}, (Function.Injective.{succ u3, succ u2} β γ (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : β) => γ) _x) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ))) g)) -> (Iff (Eq.{max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α γ rα rγ) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f₁) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f₂)) (Eq.{max (succ u1) (succ u3)} (NonUnitalRingHom.{u1, u3} α β rα rβ) f₁ f₂))
+  forall {α : Type.{u1}} {β : Type.{u3}} {γ : Type.{u2}} [rα : NonUnitalNonAssocSemiring.{u1} α] [rβ : NonUnitalNonAssocSemiring.{u3} β] [rγ : NonUnitalNonAssocSemiring.{u2} γ] {g : NonUnitalRingHom.{u3, u2} β γ rβ rγ} {f₁ : NonUnitalRingHom.{u1, u3} α β rα rβ} {f₂ : NonUnitalRingHom.{u1, u3} α β rα rβ}, (Function.Injective.{succ u3, succ u2} β γ (FunLike.coe.{max (succ u3) (succ u2), succ u3, succ u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β (fun (_x : β) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : β) => γ) _x) (MulHomClass.toFunLike.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ (NonUnitalNonAssocSemiring.toMul.{u3} β rβ) (NonUnitalNonAssocSemiring.toMul.{u2} γ rγ) (NonUnitalRingHomClass.toMulHomClass.{max u3 u2, u3, u2} (NonUnitalRingHom.{u3, u2} β γ rβ rγ) β γ rβ rγ (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u3, u2} β γ rβ rγ))) g)) -> (Iff (Eq.{max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} α γ rα rγ) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f₁) (NonUnitalRingHom.comp.{u1, u3, u2} α β γ rα rβ rγ g f₂)) (Eq.{max (succ u1) (succ u3)} (NonUnitalRingHom.{u1, u3} α β rα rβ) f₁ f₂))
 Case conversion may be inaccurate. Consider using '#align non_unital_ring_hom.cancel_left NonUnitalRingHom.cancel_leftₓ'. -/
 theorem cancel_left {g : β →ₙ+* γ} {f₁ f₂ : α →ₙ+* β} (hg : Injective g) :
     g.comp f₁ = g.comp f₂ ↔ f₁ = f₂ :=

mathlib commit https://github.com/leanprover-community/mathlib/commit/ce86f4e05e9a9b8da5e316b22c76ce76440c56a1