category_theory.preadditive.basic | Mathlib porting status

Changes since the initial port

The following section lists changes to this file in mathlib3 and mathlib4 that occured after the initial port. Most recent changes are shown first. Hovering over a commit will show all commits associated with the same mathlib3 commit.

Changes in mathlib3

829895f1

(last sync)

Changes in mathlib3port

mathlib3

mathlib3port

69c6a5a1

bump to nightly-2024-04-06-08

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

e34029c9

Diff

@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Markus Himmel, Jakob von Raumer
 -/
 import Algebra.BigOperators.Basic
-import Algebra.Hom.Group
+import Algebra.Group.Hom.Defs
 import Algebra.Module.Basic
 import CategoryTheory.Endomorphism
 import CategoryTheory.Limits.Shapes.Kernels

69c6a5a1

bump to nightly-2024-03-17-08

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

22f01ce4

Diff

@@ -228,10 +228,10 @@ theorem sum_comp {P Q R : C} {J : Type _} (s : Finset J) (f : J → (P ⟶ Q)) (
 -/
 
 instance {P Q : C} {f : P ⟶ Q} [Epi f] : Epi (-f) :=
-  ⟨fun R g g' H => by rwa [neg_comp, neg_comp, ← comp_neg, ← comp_neg, cancel_epi, neg_inj] at H ⟩
+  ⟨fun R g g' H => by rwa [neg_comp, neg_comp, ← comp_neg, ← comp_neg, cancel_epi, neg_inj] at H⟩
 
 instance {P Q : C} {f : P ⟶ Q} [Mono f] : Mono (-f) :=
-  ⟨fun R g g' H => by rwa [comp_neg, comp_neg, ← neg_comp, ← neg_comp, cancel_mono, neg_inj] at H ⟩
+  ⟨fun R g g' H => by rwa [comp_neg, comp_neg, ← neg_comp, ← neg_comp, cancel_mono, neg_inj] at H⟩
 
 #print CategoryTheory.Preadditive.preadditiveHasZeroMorphisms /-
 instance (priority := 100) preadditiveHasZeroMorphisms : HasZeroMorphisms C

69c6a5a1

bump to nightly-2023-09-24-06

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

5655435f

Diff

@@ -3,11 +3,11 @@ Copyright (c) 2020 Markus Himmel. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Markus Himmel, Jakob von Raumer
 -/
-import Mathbin.Algebra.BigOperators.Basic
-import Mathbin.Algebra.Hom.Group
-import Mathbin.Algebra.Module.Basic
-import Mathbin.CategoryTheory.Endomorphism
-import Mathbin.CategoryTheory.Limits.Shapes.Kernels
+import Algebra.BigOperators.Basic
+import Algebra.Hom.Group
+import Algebra.Module.Basic
+import CategoryTheory.Endomorphism
+import CategoryTheory.Limits.Shapes.Kernels
 
 #align_import category_theory.preadditive.basic from "leanprover-community/mathlib"@"69c6a5a12d8a2b159f20933e60115a4f2de62b58"

69c6a5a1

bump to nightly-2023-09-06-06

mathlib commit https://github.com/leanprover-community/mathlib/commit/442a83d738cb208d3600056c489be16900ba701d

f3106448

Diff

@@ -70,10 +70,6 @@ class Preadditive where
 
 attribute [instance] preadditive.hom_group
 
-restate_axiom preadditive.add_comp'
-
-restate_axiom preadditive.comp_add'
-
 attribute [simp, reassoc] preadditive.add_comp
 
 attribute [reassoc] preadditive.comp_add

69c6a5a1

bump to nightly-2023-07-20-09

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

9c56d0dd

Diff

@@ -2,11 +2,6 @@
 Copyright (c) 2020 Markus Himmel. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Markus Himmel, Jakob von Raumer
-
-! This file was ported from Lean 3 source module category_theory.preadditive.basic
-! leanprover-community/mathlib commit 69c6a5a12d8a2b159f20933e60115a4f2de62b58
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathbin.Algebra.BigOperators.Basic
 import Mathbin.Algebra.Hom.Group
@@ -14,6 +9,8 @@ import Mathbin.Algebra.Module.Basic
 import Mathbin.CategoryTheory.Endomorphism
 import Mathbin.CategoryTheory.Limits.Shapes.Kernels
 
+#align_import category_theory.preadditive.basic from "leanprover-community/mathlib"@"69c6a5a12d8a2b159f20933e60115a4f2de62b58"
+
 /-!
 # Preadditive categories

69c6a5a1

bump to nightly-2023-06-13-21

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

829520ac

Diff

@@ -115,12 +115,14 @@ instance inducedCategory : Preadditive.{v} (InducedCategory C F)
 
 end InducedCategory
 
+#print CategoryTheory.Preadditive.fullSubcategory /-
 instance fullSubcategory (Z : C → Prop) : Preadditive.{v} (FullSubcategory Z)
     where
   homGroup P Q := @Preadditive.homGroup C _ _ P.obj Q.obj
   add_comp P Q R f f' g := add_comp _ _ _ _ _ _
   comp_add P Q R f g g' := comp_add _ _ _ _ _ _
 #align category_theory.preadditive.full_subcategory CategoryTheory.Preadditive.fullSubcategory
+-/
 
 instance (X : C) : AddCommGroup (End X) := by dsimp [End]; infer_instance
 
@@ -156,31 +158,41 @@ def compHom : (P ⟶ Q) →+ (Q ⟶ R) →+ (P ⟶ R) :=
 #align category_theory.preadditive.comp_hom CategoryTheory.Preadditive.compHom
 -/
 
+#print CategoryTheory.Preadditive.sub_comp /-
 @[simp, reassoc]
 theorem sub_comp : (f - f') ≫ g = f ≫ g - f' ≫ g :=
   map_sub (rightComp P g) f f'
 #align category_theory.preadditive.sub_comp CategoryTheory.Preadditive.sub_comp
+-/
 
+#print CategoryTheory.Preadditive.comp_sub /-
 -- The redundant simp lemma linter says that simp can prove the reassoc version of this lemma.
 @[reassoc, simp]
 theorem comp_sub : f ≫ (g - g') = f ≫ g - f ≫ g' :=
   map_sub (leftComp R f) g g'
 #align category_theory.preadditive.comp_sub CategoryTheory.Preadditive.comp_sub
+-/
 
+#print CategoryTheory.Preadditive.neg_comp /-
 @[simp, reassoc]
 theorem neg_comp : (-f) ≫ g = -f ≫ g :=
   map_neg (rightComp P g) f
 #align category_theory.preadditive.neg_comp CategoryTheory.Preadditive.neg_comp
+-/
 
+#print CategoryTheory.Preadditive.comp_neg /-
 -- The redundant simp lemma linter says that simp can prove the reassoc version of this lemma.
 @[reassoc, simp]
 theorem comp_neg : f ≫ (-g) = -f ≫ g :=
   map_neg (leftComp R f) g
 #align category_theory.preadditive.comp_neg CategoryTheory.Preadditive.comp_neg
+-/
 
+#print CategoryTheory.Preadditive.neg_comp_neg /-
 @[reassoc]
 theorem neg_comp_neg : (-f) ≫ (-g) = f ≫ g := by simp
 #align category_theory.preadditive.neg_comp_neg CategoryTheory.Preadditive.neg_comp_neg
+-/
 
 #print CategoryTheory.Preadditive.nsmul_comp /-
 theorem nsmul_comp (n : ℕ) : (n • f) ≫ g = n • f ≫ g :=
@@ -206,17 +218,21 @@ theorem comp_zsmul (n : ℤ) : f ≫ (n • g) = n • f ≫ g :=
 #align category_theory.preadditive.comp_zsmul CategoryTheory.Preadditive.comp_zsmul
 -/
 
+#print CategoryTheory.Preadditive.comp_sum /-
 @[reassoc]
 theorem comp_sum {P Q R : C} {J : Type _} (s : Finset J) (f : P ⟶ Q) (g : J → (Q ⟶ R)) :
     f ≫ ∑ j in s, g j = ∑ j in s, f ≫ g j :=
   map_sum (leftComp R f) _ _
 #align category_theory.preadditive.comp_sum CategoryTheory.Preadditive.comp_sum
+-/
 
+#print CategoryTheory.Preadditive.sum_comp /-
 @[reassoc]
 theorem sum_comp {P Q R : C} {J : Type _} (s : Finset J) (f : J → (P ⟶ Q)) (g : Q ⟶ R) :
     (∑ j in s, f j) ≫ g = ∑ j in s, f j ≫ g :=
   map_sum (rightComp P g) _ _
 #align category_theory.preadditive.sum_comp CategoryTheory.Preadditive.sum_comp
+-/
 
 instance {P Q : C} {f : P ⟶ Q} [Epi f] : Epi (-f) :=
   ⟨fun R g g' H => by rwa [neg_comp, neg_comp, ← comp_neg, ← comp_neg, cancel_epi, neg_inj] at H ⟩
@@ -233,6 +249,7 @@ instance (priority := 100) preadditiveHasZeroMorphisms : HasZeroMorphisms C
 #align category_theory.preadditive.preadditive_has_zero_morphisms CategoryTheory.Preadditive.preadditiveHasZeroMorphisms
 -/
 
+#print CategoryTheory.Preadditive.moduleEndRight /-
 instance moduleEndRight {X Y : C} : Module (End Y) (X ⟶ Y)
     where
   smul_add r f g := add_comp _ _ _ _ _ _
@@ -240,6 +257,7 @@ instance moduleEndRight {X Y : C} : Module (End Y) (X ⟶ Y)
   add_smul r s f := comp_add _ _ _ _ _ _
   zero_smul r := comp_zero
 #align category_theory.preadditive.module_End_right CategoryTheory.Preadditive.moduleEndRight
+-/
 
 #print CategoryTheory.Preadditive.mono_of_cancel_zero /-
 theorem mono_of_cancel_zero {Q R : C} (f : Q ⟶ R) (h : ∀ {P : C} (g : P ⟶ Q), g ≫ f = 0 → g = 0) :
@@ -330,98 +348,129 @@ section
 
 variable {X Y : C} {f : X ⟶ Y} {g : X ⟶ Y}
 
+#print CategoryTheory.Preadditive.forkOfKernelFork /-
 /-- Map a kernel cone on the difference of two morphisms to the equalizer fork. -/
 @[simps pt]
 def forkOfKernelFork (c : KernelFork (f - g)) : Fork f g :=
   Fork.ofι c.ι <| by rw [← sub_eq_zero, ← comp_sub, c.condition]
 #align category_theory.preadditive.fork_of_kernel_fork CategoryTheory.Preadditive.forkOfKernelFork
+-/
 
+#print CategoryTheory.Preadditive.forkOfKernelFork_ι /-
 @[simp]
 theorem forkOfKernelFork_ι (c : KernelFork (f - g)) : (forkOfKernelFork c).ι = c.ι :=
   rfl
 #align category_theory.preadditive.fork_of_kernel_fork_ι CategoryTheory.Preadditive.forkOfKernelFork_ι
+-/
 
+#print CategoryTheory.Preadditive.kernelForkOfFork /-
 /-- Map any equalizer fork to a cone on the difference of the two morphisms. -/
 def kernelForkOfFork (c : Fork f g) : KernelFork (f - g) :=
   Fork.ofι c.ι <| by rw [comp_sub, comp_zero, sub_eq_zero, c.condition]
 #align category_theory.preadditive.kernel_fork_of_fork CategoryTheory.Preadditive.kernelForkOfFork
+-/
 
+#print CategoryTheory.Preadditive.kernelForkOfFork_ι /-
 @[simp]
 theorem kernelForkOfFork_ι (c : Fork f g) : (kernelForkOfFork c).ι = c.ι :=
   rfl
 #align category_theory.preadditive.kernel_fork_of_fork_ι CategoryTheory.Preadditive.kernelForkOfFork_ι
+-/
 
+#print CategoryTheory.Preadditive.kernelForkOfFork_ofι /-
 @[simp]
 theorem kernelForkOfFork_ofι {P : C} (ι : P ⟶ X) (w : ι ≫ f = ι ≫ g) :
     kernelForkOfFork (Fork.ofι ι w) = KernelFork.ofι ι (by simp [w]) :=
   rfl
 #align category_theory.preadditive.kernel_fork_of_fork_of_ι CategoryTheory.Preadditive.kernelForkOfFork_ofι
+-/
 
+#print CategoryTheory.Preadditive.isLimitForkOfKernelFork /-
 /-- A kernel of `f - g` is an equalizer of `f` and `g`. -/
 def isLimitForkOfKernelFork {c : KernelFork (f - g)} (i : IsLimit c) :
     IsLimit (forkOfKernelFork c) :=
   Fork.IsLimit.mk' _ fun s =>
     ⟨i.lift (kernelForkOfFork s), i.fac _ _, fun m h => by apply fork.is_limit.hom_ext i <;> tidy⟩
 #align category_theory.preadditive.is_limit_fork_of_kernel_fork CategoryTheory.Preadditive.isLimitForkOfKernelFork
+-/
 
+#print CategoryTheory.Preadditive.isLimitForkOfKernelFork_lift /-
 @[simp]
 theorem isLimitForkOfKernelFork_lift {c : KernelFork (f - g)} (i : IsLimit c) (s : Fork f g) :
     (isLimitForkOfKernelFork i).lift s = i.lift (kernelForkOfFork s) :=
   rfl
 #align category_theory.preadditive.is_limit_fork_of_kernel_fork_lift CategoryTheory.Preadditive.isLimitForkOfKernelFork_lift
+-/
 
+#print CategoryTheory.Preadditive.isLimitKernelForkOfFork /-
 /-- An equalizer of `f` and `g` is a kernel of `f - g`. -/
 def isLimitKernelForkOfFork {c : Fork f g} (i : IsLimit c) : IsLimit (kernelForkOfFork c) :=
   Fork.IsLimit.mk' _ fun s =>
     ⟨i.lift (forkOfKernelFork s), i.fac _ _, fun m h => by apply fork.is_limit.hom_ext i <;> tidy⟩
 #align category_theory.preadditive.is_limit_kernel_fork_of_fork CategoryTheory.Preadditive.isLimitKernelForkOfFork
+-/
 
 variable (f g)
 
+#print CategoryTheory.Preadditive.hasEqualizer_of_hasKernel /-
 /-- A preadditive category has an equalizer for `f` and `g` if it has a kernel for `f - g`. -/
 theorem hasEqualizer_of_hasKernel [HasKernel (f - g)] : HasEqualizer f g :=
   HasLimit.mk
     { Cone := forkOfKernelFork _
       IsLimit := isLimitForkOfKernelFork (equalizerIsEqualizer (f - g) 0) }
 #align category_theory.preadditive.has_equalizer_of_has_kernel CategoryTheory.Preadditive.hasEqualizer_of_hasKernel
+-/
 
+#print CategoryTheory.Preadditive.hasKernel_of_hasEqualizer /-
 /-- A preadditive category has a kernel for `f - g` if it has an equalizer for `f` and `g`. -/
 theorem hasKernel_of_hasEqualizer [HasEqualizer f g] : HasKernel (f - g) :=
   HasLimit.mk
     { Cone := kernelForkOfFork (equalizer.fork f g)
       IsLimit := isLimitKernelForkOfFork (limit.isLimit (parallelPair f g)) }
 #align category_theory.preadditive.has_kernel_of_has_equalizer CategoryTheory.Preadditive.hasKernel_of_hasEqualizer
+-/
 
 variable {f g}
 
+#print CategoryTheory.Preadditive.coforkOfCokernelCofork /-
 /-- Map a cokernel cocone on the difference of two morphisms to the coequalizer cofork. -/
 @[simps pt]
 def coforkOfCokernelCofork (c : CokernelCofork (f - g)) : Cofork f g :=
   Cofork.ofπ c.π <| by rw [← sub_eq_zero, ← sub_comp, c.condition]
 #align category_theory.preadditive.cofork_of_cokernel_cofork CategoryTheory.Preadditive.coforkOfCokernelCofork
+-/
 
+#print CategoryTheory.Preadditive.coforkOfCokernelCofork_π /-
 @[simp]
 theorem coforkOfCokernelCofork_π (c : CokernelCofork (f - g)) :
     (coforkOfCokernelCofork c).π = c.π :=
   rfl
 #align category_theory.preadditive.cofork_of_cokernel_cofork_π CategoryTheory.Preadditive.coforkOfCokernelCofork_π
+-/
 
+#print CategoryTheory.Preadditive.cokernelCoforkOfCofork /-
 /-- Map any coequalizer cofork to a cocone on the difference of the two morphisms. -/
 def cokernelCoforkOfCofork (c : Cofork f g) : CokernelCofork (f - g) :=
   Cofork.ofπ c.π <| by rw [sub_comp, zero_comp, sub_eq_zero, c.condition]
 #align category_theory.preadditive.cokernel_cofork_of_cofork CategoryTheory.Preadditive.cokernelCoforkOfCofork
+-/
 
+#print CategoryTheory.Preadditive.cokernelCoforkOfCofork_π /-
 @[simp]
 theorem cokernelCoforkOfCofork_π (c : Cofork f g) : (cokernelCoforkOfCofork c).π = c.π :=
   rfl
 #align category_theory.preadditive.cokernel_cofork_of_cofork_π CategoryTheory.Preadditive.cokernelCoforkOfCofork_π
+-/
 
+#print CategoryTheory.Preadditive.cokernelCoforkOfCofork_ofπ /-
 @[simp]
 theorem cokernelCoforkOfCofork_ofπ {P : C} (π : Y ⟶ P) (w : f ≫ π = g ≫ π) :
     cokernelCoforkOfCofork (Cofork.ofπ π w) = CokernelCofork.ofπ π (by simp [w]) :=
   rfl
 #align category_theory.preadditive.cokernel_cofork_of_cofork_of_π CategoryTheory.Preadditive.cokernelCoforkOfCofork_ofπ
+-/
 
+#print CategoryTheory.Preadditive.isColimitCoforkOfCokernelCofork /-
 /-- A cokernel of `f - g` is a coequalizer of `f` and `g`. -/
 def isColimitCoforkOfCokernelCofork {c : CokernelCofork (f - g)} (i : IsColimit c) :
     IsColimit (coforkOfCokernelCofork c) :=
@@ -429,14 +478,18 @@ def isColimitCoforkOfCokernelCofork {c : CokernelCofork (f - g)} (i : IsColimit
     ⟨i.desc (cokernelCoforkOfCofork s), i.fac _ _, fun m h => by
       apply cofork.is_colimit.hom_ext i <;> tidy⟩
 #align category_theory.preadditive.is_colimit_cofork_of_cokernel_cofork CategoryTheory.Preadditive.isColimitCoforkOfCokernelCofork
+-/
 
+#print CategoryTheory.Preadditive.isColimitCoforkOfCokernelCofork_desc /-
 @[simp]
 theorem isColimitCoforkOfCokernelCofork_desc {c : CokernelCofork (f - g)} (i : IsColimit c)
     (s : Cofork f g) :
     (isColimitCoforkOfCokernelCofork i).desc s = i.desc (cokernelCoforkOfCofork s) :=
   rfl
 #align category_theory.preadditive.is_colimit_cofork_of_cokernel_cofork_desc CategoryTheory.Preadditive.isColimitCoforkOfCokernelCofork_desc
+-/
 
+#print CategoryTheory.Preadditive.isColimitCokernelCoforkOfCofork /-
 /-- A coequalizer of `f` and `g` is a cokernel of `f - g`. -/
 def isColimitCokernelCoforkOfCofork {c : Cofork f g} (i : IsColimit c) :
     IsColimit (cokernelCoforkOfCofork c) :=
@@ -444,22 +497,27 @@ def isColimitCokernelCoforkOfCofork {c : Cofork f g} (i : IsColimit c) :
     ⟨i.desc (coforkOfCokernelCofork s), i.fac _ _, fun m h => by
       apply cofork.is_colimit.hom_ext i <;> tidy⟩
 #align category_theory.preadditive.is_colimit_cokernel_cofork_of_cofork CategoryTheory.Preadditive.isColimitCokernelCoforkOfCofork
+-/
 
 variable (f g)
 
+#print CategoryTheory.Preadditive.hasCoequalizer_of_hasCokernel /-
 /-- A preadditive category has a coequalizer for `f` and `g` if it has a cokernel for `f - g`. -/
 theorem hasCoequalizer_of_hasCokernel [HasCokernel (f - g)] : HasCoequalizer f g :=
   HasColimit.mk
     { Cocone := coforkOfCokernelCofork _
       IsColimit := isColimitCoforkOfCokernelCofork (coequalizerIsCoequalizer (f - g) 0) }
 #align category_theory.preadditive.has_coequalizer_of_has_cokernel CategoryTheory.Preadditive.hasCoequalizer_of_hasCokernel
+-/
 
+#print CategoryTheory.Preadditive.hasCokernel_of_hasCoequalizer /-
 /-- A preadditive category has a cokernel for `f - g` if it has a coequalizer for `f` and `g`. -/
 theorem hasCokernel_of_hasCoequalizer [HasCoequalizer f g] : HasCokernel (f - g) :=
   HasColimit.mk
     { Cocone := cokernelCoforkOfCofork (coequalizer.cofork f g)
       IsColimit := isColimitCokernelCoforkOfCofork (colimit.isColimit (parallelPair f g)) }
 #align category_theory.preadditive.has_cokernel_of_has_coequalizer CategoryTheory.Preadditive.hasCokernel_of_hasCoequalizer
+-/
 
 end

69c6a5a1

bump to nightly-2023-06-10-07

mathlib commit https://github.com/leanprover-community/mathlib/commit/a3e83f0fa4391c8740f7d773a7a9b74e311ae2a3

3fdc57bc

Diff

@@ -208,7 +208,7 @@ theorem comp_zsmul (n : ℤ) : f ≫ (n • g) = n • f ≫ g :=
 
 @[reassoc]
 theorem comp_sum {P Q R : C} {J : Type _} (s : Finset J) (f : P ⟶ Q) (g : J → (Q ⟶ R)) :
-    (f ≫ ∑ j in s, g j) = ∑ j in s, f ≫ g j :=
+    f ≫ ∑ j in s, g j = ∑ j in s, f ≫ g j :=
   map_sum (leftComp R f) _ _
 #align category_theory.preadditive.comp_sum CategoryTheory.Preadditive.comp_sum

69c6a5a1

bump to nightly-2023-06-01-16

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

b9c87c70

Diff

@@ -219,10 +219,10 @@ theorem sum_comp {P Q R : C} {J : Type _} (s : Finset J) (f : J → (P ⟶ Q)) (
 #align category_theory.preadditive.sum_comp CategoryTheory.Preadditive.sum_comp
 
 instance {P Q : C} {f : P ⟶ Q} [Epi f] : Epi (-f) :=
-  ⟨fun R g g' H => by rwa [neg_comp, neg_comp, ← comp_neg, ← comp_neg, cancel_epi, neg_inj] at H⟩
+  ⟨fun R g g' H => by rwa [neg_comp, neg_comp, ← comp_neg, ← comp_neg, cancel_epi, neg_inj] at H ⟩
 
 instance {P Q : C} {f : P ⟶ Q} [Mono f] : Mono (-f) :=
-  ⟨fun R g g' H => by rwa [comp_neg, comp_neg, ← neg_comp, ← neg_comp, cancel_mono, neg_inj] at H⟩
+  ⟨fun R g g' H => by rwa [comp_neg, comp_neg, ← neg_comp, ← neg_comp, cancel_mono, neg_inj] at H ⟩
 
 #print CategoryTheory.Preadditive.preadditiveHasZeroMorphisms /-
 instance (priority := 100) preadditiveHasZeroMorphisms : HasZeroMorphisms C

69c6a5a1

bump to nightly-2023-05-28-18

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

8d353152

Diff

@@ -55,7 +55,7 @@ universe v u
 
 open CategoryTheory.Limits
 
-open BigOperators
+open scoped BigOperators
 
 namespace CategoryTheory
 
@@ -302,7 +302,7 @@ theorem comp_right_eq_zero [IsIso g] : f ≫ g = 0 ↔ f = 0 := by
 
 end IsIso
 
-open ZeroObject
+open scoped ZeroObject
 
 variable [HasZeroObject C]

69c6a5a1

bump to nightly-2023-05-28-06

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

ba5d8b97

Diff

@@ -115,12 +115,6 @@ instance inducedCategory : Preadditive.{v} (InducedCategory C F)
 
 end InducedCategory
 
-/- warning: category_theory.preadditive.full_subcategory -> CategoryTheory.Preadditive.fullSubcategory is a dubious translation:
-lean 3 declaration is
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 instance fullSubcategory (Z : C → Prop) : Preadditive.{v} (FullSubcategory Z)
     where
   homGroup P Q := @Preadditive.homGroup C _ _ P.obj Q.obj
@@ -162,58 +156,28 @@ def compHom : (P ⟶ Q) →+ (Q ⟶ R) →+ (P ⟶ R) :=
 #align category_theory.preadditive.comp_hom CategoryTheory.Preadditive.compHom
 -/
 
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 @[simp, reassoc]
 theorem sub_comp : (f - f') ≫ g = f ≫ g - f' ≫ g :=
   map_sub (rightComp P g) f f'
 #align category_theory.preadditive.sub_comp CategoryTheory.Preadditive.sub_comp
 
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 -- The redundant simp lemma linter says that simp can prove the reassoc version of this lemma.
 @[reassoc, simp]
 theorem comp_sub : f ≫ (g - g') = f ≫ g - f ≫ g' :=
   map_sub (leftComp R f) g g'
 #align category_theory.preadditive.comp_sub CategoryTheory.Preadditive.comp_sub
 
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 @[simp, reassoc]
 theorem neg_comp : (-f) ≫ g = -f ≫ g :=
   map_neg (rightComp P g) f
 #align category_theory.preadditive.neg_comp CategoryTheory.Preadditive.neg_comp
 
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 -- The redundant simp lemma linter says that simp can prove the reassoc version of this lemma.
 @[reassoc, simp]
 theorem comp_neg : f ≫ (-g) = -f ≫ g :=
   map_neg (leftComp R f) g
 #align category_theory.preadditive.comp_neg CategoryTheory.Preadditive.comp_neg
 
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 @[reassoc]
 theorem neg_comp_neg : (-f) ≫ (-g) = f ≫ g := by simp
 #align category_theory.preadditive.neg_comp_neg CategoryTheory.Preadditive.neg_comp_neg
@@ -242,24 +206,12 @@ theorem comp_zsmul (n : ℤ) : f ≫ (n • g) = n • f ≫ g :=
 #align category_theory.preadditive.comp_zsmul CategoryTheory.Preadditive.comp_zsmul
 -/
 
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 @[reassoc]
 theorem comp_sum {P Q R : C} {J : Type _} (s : Finset J) (f : P ⟶ Q) (g : J → (Q ⟶ R)) :
     (f ≫ ∑ j in s, g j) = ∑ j in s, f ≫ g j :=
   map_sum (leftComp R f) _ _
 #align category_theory.preadditive.comp_sum CategoryTheory.Preadditive.comp_sum
 
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 @[reassoc]
 theorem sum_comp {P Q R : C} {J : Type _} (s : Finset J) (f : J → (P ⟶ Q)) (g : Q ⟶ R) :
     (∑ j in s, f j) ≫ g = ∑ j in s, f j ≫ g :=
@@ -281,12 +233,6 @@ instance (priority := 100) preadditiveHasZeroMorphisms : HasZeroMorphisms C
 #align category_theory.preadditive.preadditive_has_zero_morphisms CategoryTheory.Preadditive.preadditiveHasZeroMorphisms
 -/
 
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 instance moduleEndRight {X Y : C} : Module (End Y) (X ⟶ Y)
     where
   smul_add r f g := add_comp _ _ _ _ _ _
@@ -384,60 +330,33 @@ section
 
 variable {X Y : C} {f : X ⟶ Y} {g : X ⟶ Y}
 
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 /-- Map a kernel cone on the difference of two morphisms to the equalizer fork. -/
 @[simps pt]
 def forkOfKernelFork (c : KernelFork (f - g)) : Fork f g :=
   Fork.ofι c.ι <| by rw [← sub_eq_zero, ← comp_sub, c.condition]
 #align category_theory.preadditive.fork_of_kernel_fork CategoryTheory.Preadditive.forkOfKernelFork
 
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 @[simp]
 theorem forkOfKernelFork_ι (c : KernelFork (f - g)) : (forkOfKernelFork c).ι = c.ι :=
   rfl
 #align category_theory.preadditive.fork_of_kernel_fork_ι CategoryTheory.Preadditive.forkOfKernelFork_ι
 
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 /-- Map any equalizer fork to a cone on the difference of the two morphisms. -/
 def kernelForkOfFork (c : Fork f g) : KernelFork (f - g) :=
   Fork.ofι c.ι <| by rw [comp_sub, comp_zero, sub_eq_zero, c.condition]
 #align category_theory.preadditive.kernel_fork_of_fork CategoryTheory.Preadditive.kernelForkOfFork
 
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 @[simp]
 theorem kernelForkOfFork_ι (c : Fork f g) : (kernelForkOfFork c).ι = c.ι :=
   rfl
 #align category_theory.preadditive.kernel_fork_of_fork_ι CategoryTheory.Preadditive.kernelForkOfFork_ι
 
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 @[simp]
 theorem kernelForkOfFork_ofι {P : C} (ι : P ⟶ X) (w : ι ≫ f = ι ≫ g) :
     kernelForkOfFork (Fork.ofι ι w) = KernelFork.ofι ι (by simp [w]) :=
   rfl
 #align category_theory.preadditive.kernel_fork_of_fork_of_ι CategoryTheory.Preadditive.kernelForkOfFork_ofι
 
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 /-- A kernel of `f - g` is an equalizer of `f` and `g`. -/
 def isLimitForkOfKernelFork {c : KernelFork (f - g)} (i : IsLimit c) :
     IsLimit (forkOfKernelFork c) :=
@@ -445,21 +364,12 @@ def isLimitForkOfKernelFork {c : KernelFork (f - g)} (i : IsLimit c) :
     ⟨i.lift (kernelForkOfFork s), i.fac _ _, fun m h => by apply fork.is_limit.hom_ext i <;> tidy⟩
 #align category_theory.preadditive.is_limit_fork_of_kernel_fork CategoryTheory.Preadditive.isLimitForkOfKernelFork
 
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 @[simp]
 theorem isLimitForkOfKernelFork_lift {c : KernelFork (f - g)} (i : IsLimit c) (s : Fork f g) :
     (isLimitForkOfKernelFork i).lift s = i.lift (kernelForkOfFork s) :=
   rfl
 #align category_theory.preadditive.is_limit_fork_of_kernel_fork_lift CategoryTheory.Preadditive.isLimitForkOfKernelFork_lift
 
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 /-- An equalizer of `f` and `g` is a kernel of `f - g`. -/
 def isLimitKernelForkOfFork {c : Fork f g} (i : IsLimit c) : IsLimit (kernelForkOfFork c) :=
   Fork.IsLimit.mk' _ fun s =>
@@ -468,12 +378,6 @@ def isLimitKernelForkOfFork {c : Fork f g} (i : IsLimit c) : IsLimit (kernelFork
 
 variable (f g)
 
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 /-- A preadditive category has an equalizer for `f` and `g` if it has a kernel for `f - g`. -/
 theorem hasEqualizer_of_hasKernel [HasKernel (f - g)] : HasEqualizer f g :=
   HasLimit.mk
@@ -481,12 +385,6 @@ theorem hasEqualizer_of_hasKernel [HasKernel (f - g)] : HasEqualizer f g :=
       IsLimit := isLimitForkOfKernelFork (equalizerIsEqualizer (f - g) 0) }
 #align category_theory.preadditive.has_equalizer_of_has_kernel CategoryTheory.Preadditive.hasEqualizer_of_hasKernel
 
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 /-- A preadditive category has a kernel for `f - g` if it has an equalizer for `f` and `g`. -/
 theorem hasKernel_of_hasEqualizer [HasEqualizer f g] : HasKernel (f - g) :=
   HasLimit.mk
@@ -496,61 +394,34 @@ theorem hasKernel_of_hasEqualizer [HasEqualizer f g] : HasKernel (f - g) :=
 
 variable {f g}
 
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 /-- Map a cokernel cocone on the difference of two morphisms to the coequalizer cofork. -/
 @[simps pt]
 def coforkOfCokernelCofork (c : CokernelCofork (f - g)) : Cofork f g :=
   Cofork.ofπ c.π <| by rw [← sub_eq_zero, ← sub_comp, c.condition]
 #align category_theory.preadditive.cofork_of_cokernel_cofork CategoryTheory.Preadditive.coforkOfCokernelCofork
 
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 @[simp]
 theorem coforkOfCokernelCofork_π (c : CokernelCofork (f - g)) :
     (coforkOfCokernelCofork c).π = c.π :=
   rfl
 #align category_theory.preadditive.cofork_of_cokernel_cofork_π CategoryTheory.Preadditive.coforkOfCokernelCofork_π
 
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 /-- Map any coequalizer cofork to a cocone on the difference of the two morphisms. -/
 def cokernelCoforkOfCofork (c : Cofork f g) : CokernelCofork (f - g) :=
   Cofork.ofπ c.π <| by rw [sub_comp, zero_comp, sub_eq_zero, c.condition]
 #align category_theory.preadditive.cokernel_cofork_of_cofork CategoryTheory.Preadditive.cokernelCoforkOfCofork
 
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 @[simp]
 theorem cokernelCoforkOfCofork_π (c : Cofork f g) : (cokernelCoforkOfCofork c).π = c.π :=
   rfl
 #align category_theory.preadditive.cokernel_cofork_of_cofork_π CategoryTheory.Preadditive.cokernelCoforkOfCofork_π
 
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 @[simp]
 theorem cokernelCoforkOfCofork_ofπ {P : C} (π : Y ⟶ P) (w : f ≫ π = g ≫ π) :
     cokernelCoforkOfCofork (Cofork.ofπ π w) = CokernelCofork.ofπ π (by simp [w]) :=
   rfl
 #align category_theory.preadditive.cokernel_cofork_of_cofork_of_π CategoryTheory.Preadditive.cokernelCoforkOfCofork_ofπ
 
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 /-- A cokernel of `f - g` is a coequalizer of `f` and `g`. -/
 def isColimitCoforkOfCokernelCofork {c : CokernelCofork (f - g)} (i : IsColimit c) :
     IsColimit (coforkOfCokernelCofork c) :=
@@ -559,9 +430,6 @@ def isColimitCoforkOfCokernelCofork {c : CokernelCofork (f - g)} (i : IsColimit
       apply cofork.is_colimit.hom_ext i <;> tidy⟩
 #align category_theory.preadditive.is_colimit_cofork_of_cokernel_cofork CategoryTheory.Preadditive.isColimitCoforkOfCokernelCofork
 
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 @[simp]
 theorem isColimitCoforkOfCokernelCofork_desc {c : CokernelCofork (f - g)} (i : IsColimit c)
     (s : Cofork f g) :
@@ -569,12 +437,6 @@ theorem isColimitCoforkOfCokernelCofork_desc {c : CokernelCofork (f - g)} (i : I
   rfl
 #align category_theory.preadditive.is_colimit_cofork_of_cokernel_cofork_desc CategoryTheory.Preadditive.isColimitCoforkOfCokernelCofork_desc
 
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 /-- A coequalizer of `f` and `g` is a cokernel of `f - g`. -/
 def isColimitCokernelCoforkOfCofork {c : Cofork f g} (i : IsColimit c) :
     IsColimit (cokernelCoforkOfCofork c) :=
@@ -585,12 +447,6 @@ def isColimitCokernelCoforkOfCofork {c : Cofork f g} (i : IsColimit c) :
 
 variable (f g)
 
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 /-- A preadditive category has a coequalizer for `f` and `g` if it has a cokernel for `f - g`. -/
 theorem hasCoequalizer_of_hasCokernel [HasCokernel (f - g)] : HasCoequalizer f g :=
   HasColimit.mk
@@ -598,12 +454,6 @@ theorem hasCoequalizer_of_hasCokernel [HasCokernel (f - g)] : HasCoequalizer f g
       IsColimit := isColimitCoforkOfCokernelCofork (coequalizerIsCoequalizer (f - g) 0) }
 #align category_theory.preadditive.has_coequalizer_of_has_cokernel CategoryTheory.Preadditive.hasCoequalizer_of_hasCokernel
 
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 /-- A preadditive category has a cokernel for `f - g` if it has a coequalizer for `f` and `g`. -/
 theorem hasCokernel_of_hasCoequalizer [HasCoequalizer f g] : HasCokernel (f - g) :=
   HasColimit.mk

69c6a5a1

bump to nightly-2023-05-28-04

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

6797a637

Diff

@@ -128,9 +128,7 @@ instance fullSubcategory (Z : C → Prop) : Preadditive.{v} (FullSubcategory Z)
   comp_add P Q R f g g' := comp_add _ _ _ _ _ _
 #align category_theory.preadditive.full_subcategory CategoryTheory.Preadditive.fullSubcategory
 
-instance (X : C) : AddCommGroup (End X) := by
-  dsimp [End]
-  infer_instance
+instance (X : C) : AddCommGroup (End X) := by dsimp [End]; infer_instance
 
 instance (X : C) : Ring (End X) :=
   { (inferInstance : AddCommGroup (End X)),

69c6a5a1

bump to nightly-2023-05-28-03

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

6c6011cf

Diff

@@ -399,10 +399,7 @@ def forkOfKernelFork (c : KernelFork (f - g)) : Fork f g :=
 #align category_theory.preadditive.fork_of_kernel_fork CategoryTheory.Preadditive.forkOfKernelFork
 
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 Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.fork_of_kernel_fork_ι CategoryTheory.Preadditive.forkOfKernelFork_ιₓ'. -/
 @[simp]
 theorem forkOfKernelFork_ι (c : KernelFork (f - g)) : (forkOfKernelFork c).ι = c.ι :=
@@ -421,10 +418,7 @@ def kernelForkOfFork (c : Fork f g) : KernelFork (f - g) :=
 #align category_theory.preadditive.kernel_fork_of_fork CategoryTheory.Preadditive.kernelForkOfFork
 
 /- warning: category_theory.preadditive.kernel_fork_of_fork_ι -> CategoryTheory.Preadditive.kernelForkOfFork_ι is a dubious translation:
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 Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.kernel_fork_of_fork_ι CategoryTheory.Preadditive.kernelForkOfFork_ιₓ'. -/
 @[simp]
 theorem kernelForkOfFork_ι (c : Fork f g) : (kernelForkOfFork c).ι = c.ι :=
@@ -432,10 +426,7 @@ theorem kernelForkOfFork_ι (c : Fork f g) : (kernelForkOfFork c).ι = c.ι :=
 #align category_theory.preadditive.kernel_fork_of_fork_ι CategoryTheory.Preadditive.kernelForkOfFork_ι
 
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+<too large>
 Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.kernel_fork_of_fork_of_ι CategoryTheory.Preadditive.kernelForkOfFork_ofιₓ'. -/
 @[simp]
 theorem kernelForkOfFork_ofι {P : C} (ι : P ⟶ X) (w : ι ≫ f = ι ≫ g) :
@@ -457,10 +448,7 @@ def isLimitForkOfKernelFork {c : KernelFork (f - g)} (i : IsLimit c) :
 #align category_theory.preadditive.is_limit_fork_of_kernel_fork CategoryTheory.Preadditive.isLimitForkOfKernelFork
 
 /- warning: category_theory.preadditive.is_limit_fork_of_kernel_fork_lift -> CategoryTheory.Preadditive.isLimitForkOfKernelFork_lift is a dubious translation:
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+<too large>
 Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.is_limit_fork_of_kernel_fork_lift CategoryTheory.Preadditive.isLimitForkOfKernelFork_liftₓ'. -/
 @[simp]
 theorem isLimitForkOfKernelFork_lift {c : KernelFork (f - g)} (i : IsLimit c) (s : Fork f g) :
@@ -523,10 +511,7 @@ def coforkOfCokernelCofork (c : CokernelCofork (f - g)) : Cofork f g :=
 #align category_theory.preadditive.cofork_of_cokernel_cofork CategoryTheory.Preadditive.coforkOfCokernelCofork
 
 /- warning: category_theory.preadditive.cofork_of_cokernel_cofork_π -> CategoryTheory.Preadditive.coforkOfCokernelCofork_π is a dubious translation:
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+<too large>
 Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.cofork_of_cokernel_cofork_π CategoryTheory.Preadditive.coforkOfCokernelCofork_πₓ'. -/
 @[simp]
 theorem coforkOfCokernelCofork_π (c : CokernelCofork (f - g)) :
@@ -546,10 +531,7 @@ def cokernelCoforkOfCofork (c : Cofork f g) : CokernelCofork (f - g) :=
 #align category_theory.preadditive.cokernel_cofork_of_cofork CategoryTheory.Preadditive.cokernelCoforkOfCofork
 
 /- warning: category_theory.preadditive.cokernel_cofork_of_cofork_π -> CategoryTheory.Preadditive.cokernelCoforkOfCofork_π is a dubious translation:
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 Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.cokernel_cofork_of_cofork_π CategoryTheory.Preadditive.cokernelCoforkOfCofork_πₓ'. -/
 @[simp]
 theorem cokernelCoforkOfCofork_π (c : Cofork f g) : (cokernelCoforkOfCofork c).π = c.π :=
@@ -557,10 +539,7 @@ theorem cokernelCoforkOfCofork_π (c : Cofork f g) : (cokernelCoforkOfCofork c).
 #align category_theory.preadditive.cokernel_cofork_of_cofork_π CategoryTheory.Preadditive.cokernelCoforkOfCofork_π
 
 /- warning: category_theory.preadditive.cokernel_cofork_of_cofork_of_π -> CategoryTheory.Preadditive.cokernelCoforkOfCofork_ofπ is a dubious translation:
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+<too large>
 Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.cokernel_cofork_of_cofork_of_π CategoryTheory.Preadditive.cokernelCoforkOfCofork_ofπₓ'. -/
 @[simp]
 theorem cokernelCoforkOfCofork_ofπ {P : C} (π : Y ⟶ P) (w : f ≫ π = g ≫ π) :
@@ -583,10 +562,7 @@ def isColimitCoforkOfCokernelCofork {c : CokernelCofork (f - g)} (i : IsColimit
 #align category_theory.preadditive.is_colimit_cofork_of_cokernel_cofork CategoryTheory.Preadditive.isColimitCoforkOfCokernelCofork
 
 /- warning: category_theory.preadditive.is_colimit_cofork_of_cokernel_cofork_desc -> CategoryTheory.Preadditive.isColimitCoforkOfCokernelCofork_desc is a dubious translation:
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+<too large>
 Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.is_colimit_cofork_of_cokernel_cofork_desc CategoryTheory.Preadditive.isColimitCoforkOfCokernelCofork_descₓ'. -/
 @[simp]
 theorem isColimitCoforkOfCokernelCofork_desc {c : CokernelCofork (f - g)} (i : IsColimit c)

69c6a5a1

bump to nightly-2023-05-23-03

mathlib commit https://github.com/leanprover-community/mathlib/commit/75e7fca56381d056096ce5d05e938f63a6567828

ed98987c

Diff

@@ -77,9 +77,9 @@ restate_axiom preadditive.add_comp'
 
 restate_axiom preadditive.comp_add'
 
-attribute [simp, reassoc.1] preadditive.add_comp
+attribute [simp, reassoc] preadditive.add_comp
 
-attribute [reassoc.1] preadditive.comp_add
+attribute [reassoc] preadditive.comp_add
 
 -- (the linter doesn't like `simp` on this lemma)
 attribute [simp] preadditive.comp_add
@@ -170,7 +170,7 @@ lean 3 declaration is
 but is expected to have type
   forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] {P : C} {Q : C} {R : C} (f : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (f' : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (g : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R), Eq.{succ u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (CategoryTheory.CategoryStruct.comp.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1) P Q R (HSub.hSub.{u1, u1, u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (instHSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (SubNegMonoid.toSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (AddGroup.toSubNegMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (AddCommGroup.toAddGroup.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 P Q))))) f f') g) (HSub.hSub.{u1, u1, u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (instHSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (SubNegMonoid.toSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (AddGroup.toSubNegMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (AddCommGroup.toAddGroup.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 P R))))) (CategoryTheory.CategoryStruct.comp.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1) P Q R f g) (CategoryTheory.CategoryStruct.comp.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1) P Q R f' g))
 Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.sub_comp CategoryTheory.Preadditive.sub_compₓ'. -/
-@[simp, reassoc.1]
+@[simp, reassoc]
 theorem sub_comp : (f - f') ≫ g = f ≫ g - f' ≫ g :=
   map_sub (rightComp P g) f f'
 #align category_theory.preadditive.sub_comp CategoryTheory.Preadditive.sub_comp
@@ -182,7 +182,7 @@ but is expected to have type
   forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] {P : C} {Q : C} {R : C} (f : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (g : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R) (g' : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R), Eq.{succ u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (CategoryTheory.CategoryStruct.comp.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1) P Q R f (HSub.hSub.{u1, u1, u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R) (instHSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R) (SubNegMonoid.toSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R) (AddGroup.toSubNegMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R) (AddCommGroup.toAddGroup.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 Q R))))) g g')) (HSub.hSub.{u1, u1, u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (instHSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (SubNegMonoid.toSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (AddGroup.toSubNegMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (AddCommGroup.toAddGroup.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 P R))))) (CategoryTheory.CategoryStruct.comp.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1) P Q R f g) (CategoryTheory.CategoryStruct.comp.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1) P Q R f g'))
 Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.comp_sub CategoryTheory.Preadditive.comp_subₓ'. -/
 -- The redundant simp lemma linter says that simp can prove the reassoc version of this lemma.
-@[reassoc.1, simp]
+@[reassoc, simp]
 theorem comp_sub : f ≫ (g - g') = f ≫ g - f ≫ g' :=
   map_sub (leftComp R f) g g'
 #align category_theory.preadditive.comp_sub CategoryTheory.Preadditive.comp_sub
@@ -193,7 +193,7 @@ lean 3 declaration is
 but is expected to have type
   forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] {P : C} {Q : C} {R : C} (f : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (g : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R), Eq.{succ u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (CategoryTheory.CategoryStruct.comp.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1) P Q R (Neg.neg.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (NegZeroClass.toNeg.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (SubNegZeroMonoid.toNegZeroClass.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (SubtractionMonoid.toSubNegZeroMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (SubtractionCommMonoid.toSubtractionMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (AddCommGroup.toDivisionAddCommMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 P Q)))))) f) g) (Neg.neg.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (NegZeroClass.toNeg.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (SubNegZeroMonoid.toNegZeroClass.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (SubtractionMonoid.toSubNegZeroMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (SubtractionCommMonoid.toSubtractionMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (AddCommGroup.toDivisionAddCommMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 P R)))))) (CategoryTheory.CategoryStruct.comp.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1) P Q R f g))
 Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.neg_comp CategoryTheory.Preadditive.neg_compₓ'. -/
-@[simp, reassoc.1]
+@[simp, reassoc]
 theorem neg_comp : (-f) ≫ g = -f ≫ g :=
   map_neg (rightComp P g) f
 #align category_theory.preadditive.neg_comp CategoryTheory.Preadditive.neg_comp
@@ -205,7 +205,7 @@ but is expected to have type
   forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] {P : C} {Q : C} {R : C} (f : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (g : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R), Eq.{succ u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (CategoryTheory.CategoryStruct.comp.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1) P Q R f (Neg.neg.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R) (NegZeroClass.toNeg.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R) (SubNegZeroMonoid.toNegZeroClass.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R) (SubtractionMonoid.toSubNegZeroMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R) (SubtractionCommMonoid.toSubtractionMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R) (AddCommGroup.toDivisionAddCommMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 Q R)))))) g)) (Neg.neg.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (NegZeroClass.toNeg.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (SubNegZeroMonoid.toNegZeroClass.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (SubtractionMonoid.toSubNegZeroMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (SubtractionCommMonoid.toSubtractionMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (AddCommGroup.toDivisionAddCommMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 P R)))))) (CategoryTheory.CategoryStruct.comp.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1) P Q R f g))
 Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.comp_neg CategoryTheory.Preadditive.comp_negₓ'. -/
 -- The redundant simp lemma linter says that simp can prove the reassoc version of this lemma.
-@[reassoc.1, simp]
+@[reassoc, simp]
 theorem comp_neg : f ≫ (-g) = -f ≫ g :=
   map_neg (leftComp R f) g
 #align category_theory.preadditive.comp_neg CategoryTheory.Preadditive.comp_neg
@@ -216,7 +216,7 @@ lean 3 declaration is
 but is expected to have type
   forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] {P : C} {Q : C} {R : C} (f : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (g : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R), Eq.{succ u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P R) (CategoryTheory.CategoryStruct.comp.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1) P Q R (Neg.neg.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (NegZeroClass.toNeg.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (SubNegZeroMonoid.toNegZeroClass.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (SubtractionMonoid.toSubNegZeroMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (SubtractionCommMonoid.toSubtractionMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (AddCommGroup.toDivisionAddCommMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Q) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 P Q)))))) f) (Neg.neg.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R) (NegZeroClass.toNeg.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R) (SubNegZeroMonoid.toNegZeroClass.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R) (SubtractionMonoid.toSubNegZeroMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R) (SubtractionCommMonoid.toSubtractionMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R) (AddCommGroup.toDivisionAddCommMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Q R) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 Q R)))))) g)) (CategoryTheory.CategoryStruct.comp.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1) P Q R f g)
 Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.neg_comp_neg CategoryTheory.Preadditive.neg_comp_negₓ'. -/
-@[reassoc.1]
+@[reassoc]
 theorem neg_comp_neg : (-f) ≫ (-g) = f ≫ g := by simp
 #align category_theory.preadditive.neg_comp_neg CategoryTheory.Preadditive.neg_comp_neg
 
@@ -250,7 +250,7 @@ lean 3 declaration is
 but is expected to have type
   forall {C : Type.{u3}} [_inst_1 : CategoryTheory.Category.{u2, u3} C] [_inst_2 : CategoryTheory.Preadditive.{u2, u3} C _inst_1] {P : C} {Q : C} {R : C} {J : Type.{u1}} (s : Finset.{u1} J) (f : Quiver.Hom.{succ u2, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1)) P Q) (g : J -> (Quiver.Hom.{succ u2, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1)) Q R)), Eq.{succ u2} (Quiver.Hom.{succ u2, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1)) P R) (CategoryTheory.CategoryStruct.comp.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1) P Q R f (Finset.sum.{u2, u1} (Quiver.Hom.{succ u2, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1)) Q R) J (AddCommGroup.toAddCommMonoid.{u2} (Quiver.Hom.{succ u2, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1)) Q R) (CategoryTheory.Preadditive.homGroup.{u2, u3} C _inst_1 _inst_2 Q R)) s (fun (j : J) => g j))) (Finset.sum.{u2, u1} (Quiver.Hom.{succ u2, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1)) P R) J (AddCommGroup.toAddCommMonoid.{u2} (Quiver.Hom.{succ u2, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1)) P R) (CategoryTheory.Preadditive.homGroup.{u2, u3} C _inst_1 _inst_2 P R)) s (fun (j : J) => CategoryTheory.CategoryStruct.comp.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1) P Q R f (g j)))
 Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.comp_sum CategoryTheory.Preadditive.comp_sumₓ'. -/
-@[reassoc.1]
+@[reassoc]
 theorem comp_sum {P Q R : C} {J : Type _} (s : Finset J) (f : P ⟶ Q) (g : J → (Q ⟶ R)) :
     (f ≫ ∑ j in s, g j) = ∑ j in s, f ≫ g j :=
   map_sum (leftComp R f) _ _
@@ -262,7 +262,7 @@ lean 3 declaration is
 but is expected to have type
   forall {C : Type.{u3}} [_inst_1 : CategoryTheory.Category.{u2, u3} C] [_inst_2 : CategoryTheory.Preadditive.{u2, u3} C _inst_1] {P : C} {Q : C} {R : C} {J : Type.{u1}} (s : Finset.{u1} J) (f : J -> (Quiver.Hom.{succ u2, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1)) P Q)) (g : Quiver.Hom.{succ u2, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1)) Q R), Eq.{succ u2} (Quiver.Hom.{succ u2, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1)) P R) (CategoryTheory.CategoryStruct.comp.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1) P Q R (Finset.sum.{u2, u1} (Quiver.Hom.{succ u2, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1)) P Q) J (AddCommGroup.toAddCommMonoid.{u2} (Quiver.Hom.{succ u2, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1)) P Q) (CategoryTheory.Preadditive.homGroup.{u2, u3} C _inst_1 _inst_2 P Q)) s (fun (j : J) => f j)) g) (Finset.sum.{u2, u1} (Quiver.Hom.{succ u2, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1)) P R) J (AddCommGroup.toAddCommMonoid.{u2} (Quiver.Hom.{succ u2, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1)) P R) (CategoryTheory.Preadditive.homGroup.{u2, u3} C _inst_1 _inst_2 P R)) s (fun (j : J) => CategoryTheory.CategoryStruct.comp.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1) P Q R (f j) g))
 Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.sum_comp CategoryTheory.Preadditive.sum_compₓ'. -/
-@[reassoc.1]
+@[reassoc]
 theorem sum_comp {P Q R : C} {J : Type _} (s : Finset J) (f : J → (P ⟶ Q)) (g : Q ⟶ R) :
     (∑ j in s, f j) ≫ g = ∑ j in s, f j ≫ g :=
   map_sum (rightComp P g) _ _

69c6a5a1

bump to nightly-2023-04-14-00

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

48c54fa4

Diff

@@ -435,7 +435,7 @@ theorem kernelForkOfFork_ι (c : Fork f g) : (kernelForkOfFork c).ι = c.ι :=
 lean 3 declaration is
   forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] {X : C} {Y : C} {f : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y} {g : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y} {P : C} (ι : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P X) (w : Eq.{succ u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Y) (CategoryTheory.CategoryStruct.comp.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1) P X Y ι f) (CategoryTheory.CategoryStruct.comp.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1) P X Y ι g)), Eq.{max 1 (succ u2) (succ u1)} (CategoryTheory.Limits.KernelFork.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) X Y (HSub.hSub.{u1, u1, u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (instHSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (SubNegMonoid.toHasSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddGroup.toSubNegMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddCommGroup.toAddGroup.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 X Y))))) f g)) (CategoryTheory.Preadditive.kernelForkOfFork.{u1, u2} C _inst_1 _inst_2 X Y f g (CategoryTheory.Limits.Fork.ofι.{u1, u2} C _inst_1 X Y f g P ι w)) (CategoryTheory.Limits.KernelFork.ofι.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) X Y (HSub.hSub.{u1, u1, u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (instHSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (SubNegMonoid.toHasSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddGroup.toSubNegMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddCommGroup.toAddGroup.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 X Y))))) f g) P ι (Eq.mpr.{0} (Eq.{succ u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Y) (CategoryTheory.CategoryStruct.comp.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1) P X Y ι (HSub.hSub.{u1, u1, u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (instHSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (SubNegMonoid.toHasSub.{u1} (Quiver.Hom.{succ u1, u2} C 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(CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Y) (CategoryTheory.Limits.HasZeroMorphisms.hasZero.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) P Y))))) True (id_tag Tactic.IdTag.simp (Eq.{1} Prop (Eq.{succ u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Y) (CategoryTheory.CategoryStruct.comp.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1) P X Y ι (HSub.hSub.{u1, u1, u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (instHSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (SubNegMonoid.toHasSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddGroup.toSubNegMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddCommGroup.toAddGroup.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 X Y))))) f g)) (OfNat.ofNat.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Y) 0 (OfNat.mk.{u1} (Quiver.Hom.{succ u1, u2} C 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 but is expected to have type
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_inst_1)) P Y) (SubtractionMonoid.toSubNegZeroMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Y) (AddGroup.toSubtractionMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Y) (AddCommGroup.toAddGroup.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) P Y) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 P Y))))))))))))
 Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.kernel_fork_of_fork_of_ι CategoryTheory.Preadditive.kernelForkOfFork_ofιₓ'. -/
 @[simp]
 theorem kernelForkOfFork_ofι {P : C} (ι : P ⟶ X) (w : ι ≫ f = ι ≫ g) :
@@ -560,7 +560,7 @@ theorem cokernelCoforkOfCofork_π (c : Cofork f g) : (cokernelCoforkOfCofork c).
 lean 3 declaration is
   forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] {X : C} {Y : C} {f : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y} {g : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y} {P : C} (π : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) Y P) (w : Eq.{succ u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X P) (CategoryTheory.CategoryStruct.comp.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1) X Y P f π) (CategoryTheory.CategoryStruct.comp.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1) X Y P g π)), Eq.{max 1 (succ u2) (succ u1)} (CategoryTheory.Limits.CokernelCofork.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) X Y (HSub.hSub.{u1, u1, u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (instHSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (SubNegMonoid.toHasSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) 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 but is expected to have type
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 Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.cokernel_cofork_of_cofork_of_π CategoryTheory.Preadditive.cokernelCoforkOfCofork_ofπₓ'. -/
 @[simp]
 theorem cokernelCoforkOfCofork_ofπ {P : C} (π : Y ⟶ P) (w : f ≫ π = g ≫ π) :

69c6a5a1

bump to nightly-2023-03-14-02

mathlib commit https://github.com/leanprover-community/mathlib/commit/2196ab363eb097c008d4497125e0dde23fb36db2

d4b38a42

Diff

@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Markus Himmel, Jakob von Raumer
 
 ! This file was ported from Lean 3 source module category_theory.preadditive.basic
-! leanprover-community/mathlib commit 829895f162a1f29d0133f4b3538f4cd1fb5bffd3
+! leanprover-community/mathlib commit 69c6a5a12d8a2b159f20933e60115a4f2de62b58
 ! Please do not edit these lines, except to modify the commit id
 ! if you have ported upstream changes.
 -/
@@ -17,6 +17,9 @@ import Mathbin.CategoryTheory.Limits.Shapes.Kernels
 /-!
 # Preadditive categories
 
+> THIS FILE IS SYNCHRONIZED WITH MATHLIB4.
+> Any changes to this file require a corresponding PR to mathlib4.
+
 A preadditive category is a category in which `X ⟶ Y` is an abelian group in such a way that
 composition of morphisms is linear in both variables.

829895f1

bump to nightly-2023-03-09-08

mathlib commit https://github.com/leanprover-community/mathlib/commit/21e3562c5e12d846c7def5eff8cdbc520d7d4936

a3ca2eeb

Diff

@@ -58,15 +58,15 @@ namespace CategoryTheory
 
 variable (C : Type u) [Category.{v} C]
 
+#print CategoryTheory.Preadditive /-
 /-- A category is called preadditive if `P ⟶ Q` is an abelian group such that composition is
     linear in both variables. -/
 class Preadditive where
   homGroup : ∀ P Q : C, AddCommGroup (P ⟶ Q) := by infer_instance
-  add_comp' : ∀ (P Q R : C) (f f' : P ⟶ Q) (g : Q ⟶ R), (f + f') ≫ g = f ≫ g + f' ≫ g := by
-    obviously
-  comp_add' : ∀ (P Q R : C) (f : P ⟶ Q) (g g' : Q ⟶ R), f ≫ (g + g') = f ≫ g + f ≫ g' := by
-    obviously
+  add_comp : ∀ (P Q R : C) (f f' : P ⟶ Q) (g : Q ⟶ R), (f + f') ≫ g = f ≫ g + f' ≫ g := by obviously
+  comp_add : ∀ (P Q R : C) (f : P ⟶ Q) (g g' : Q ⟶ R), f ≫ (g + g') = f ≫ g + f ≫ g' := by obviously
 #align category_theory.preadditive CategoryTheory.Preadditive
+-/
 
 attribute [instance] preadditive.hom_group
 
@@ -101,20 +101,28 @@ universe u'
 
 variable {C} {D : Type u'} (F : D → C)
 
+#print CategoryTheory.Preadditive.inducedCategory /-
 instance inducedCategory : Preadditive.{v} (InducedCategory C F)
     where
   homGroup P Q := @Preadditive.homGroup C _ _ (F P) (F Q)
-  add_comp' P Q R f f' g := add_comp' _ _ _ _ _ _
-  comp_add' P Q R f g g' := comp_add' _ _ _ _ _ _
+  add_comp P Q R f f' g := add_comp _ _ _ _ _ _
+  comp_add P Q R f g g' := comp_add _ _ _ _ _ _
 #align category_theory.preadditive.induced_category CategoryTheory.Preadditive.inducedCategory
+-/
 
 end InducedCategory
 
+/- warning: category_theory.preadditive.full_subcategory -> CategoryTheory.Preadditive.fullSubcategory is a dubious translation:
+lean 3 declaration is
+  forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] (Z : C -> Prop), CategoryTheory.Preadditive.{u1, u2} (CategoryTheory.FullSubcategoryₓ.{u1, u2} C _inst_1 Z) (CategoryTheory.FullSubcategory.category.{u1, u2} C _inst_1 Z)
+but is expected to have type
+  forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] (Z : C -> Prop), CategoryTheory.Preadditive.{u1, u2} (CategoryTheory.FullSubcategory.{u2} C Z) (CategoryTheory.FullSubcategory.category.{u1, u2} C _inst_1 Z)
+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.full_subcategory CategoryTheory.Preadditive.fullSubcategoryₓ'. -/
 instance fullSubcategory (Z : C → Prop) : Preadditive.{v} (FullSubcategory Z)
     where
   homGroup P Q := @Preadditive.homGroup C _ _ P.obj Q.obj
-  add_comp' P Q R f f' g := add_comp' _ _ _ _ _ _
-  comp_add' P Q R f g g' := comp_add' _ _ _ _ _ _
+  add_comp P Q R f f' g := add_comp _ _ _ _ _ _
+  comp_add P Q R f g g' := comp_add _ _ _ _ _ _
 #align category_theory.preadditive.full_subcategory CategoryTheory.Preadditive.fullSubcategory
 
 instance (X : C) : AddCommGroup (End X) := by
@@ -129,72 +137,128 @@ instance (X : C) : Ring (End X) :=
     left_distrib := fun f g h => Preadditive.add_comp X X X g h f
     right_distrib := fun f g h => Preadditive.comp_add X X X h f g }
 
+#print CategoryTheory.Preadditive.leftComp /-
 /-- Composition by a fixed left argument as a group homomorphism -/
 def leftComp {P Q : C} (R : C) (f : P ⟶ Q) : (Q ⟶ R) →+ (P ⟶ R) :=
   mk' (fun g => f ≫ g) fun g g' => by simp
 #align category_theory.preadditive.left_comp CategoryTheory.Preadditive.leftComp
+-/
 
+#print CategoryTheory.Preadditive.rightComp /-
 /-- Composition by a fixed right argument as a group homomorphism -/
 def rightComp (P : C) {Q R : C} (g : Q ⟶ R) : (P ⟶ Q) →+ (P ⟶ R) :=
   mk' (fun f => f ≫ g) fun f f' => by simp
 #align category_theory.preadditive.right_comp CategoryTheory.Preadditive.rightComp
+-/
 
 variable {P Q R : C} (f f' : P ⟶ Q) (g g' : Q ⟶ R)
 
+#print CategoryTheory.Preadditive.compHom /-
 /-- Composition as a bilinear group homomorphism -/
 def compHom : (P ⟶ Q) →+ (Q ⟶ R) →+ (P ⟶ R) :=
   AddMonoidHom.mk' (fun f => leftComp _ f) fun f₁ f₂ =>
     AddMonoidHom.ext fun g => (rightComp _ g).map_add f₁ f₂
 #align category_theory.preadditive.comp_hom CategoryTheory.Preadditive.compHom
+-/
 
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+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.sub_comp CategoryTheory.Preadditive.sub_compₓ'. -/
 @[simp, reassoc.1]
 theorem sub_comp : (f - f') ≫ g = f ≫ g - f' ≫ g :=
   map_sub (rightComp P g) f f'
 #align category_theory.preadditive.sub_comp CategoryTheory.Preadditive.sub_comp
 
+/- warning: category_theory.preadditive.comp_sub -> CategoryTheory.Preadditive.comp_sub is a dubious translation:
+lean 3 declaration is
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+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.comp_sub CategoryTheory.Preadditive.comp_subₓ'. -/
 -- The redundant simp lemma linter says that simp can prove the reassoc version of this lemma.
 @[reassoc.1, simp]
 theorem comp_sub : f ≫ (g - g') = f ≫ g - f ≫ g' :=
   map_sub (leftComp R f) g g'
 #align category_theory.preadditive.comp_sub CategoryTheory.Preadditive.comp_sub
 
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 @[simp, reassoc.1]
 theorem neg_comp : (-f) ≫ g = -f ≫ g :=
   map_neg (rightComp P g) f
 #align category_theory.preadditive.neg_comp CategoryTheory.Preadditive.neg_comp
 
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+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.comp_neg CategoryTheory.Preadditive.comp_negₓ'. -/
 -- The redundant simp lemma linter says that simp can prove the reassoc version of this lemma.
 @[reassoc.1, simp]
 theorem comp_neg : f ≫ (-g) = -f ≫ g :=
   map_neg (leftComp R f) g
 #align category_theory.preadditive.comp_neg CategoryTheory.Preadditive.comp_neg
 
+/- warning: category_theory.preadditive.neg_comp_neg -> CategoryTheory.Preadditive.neg_comp_neg is a dubious translation:
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 @[reassoc.1]
 theorem neg_comp_neg : (-f) ≫ (-g) = f ≫ g := by simp
 #align category_theory.preadditive.neg_comp_neg CategoryTheory.Preadditive.neg_comp_neg
 
+#print CategoryTheory.Preadditive.nsmul_comp /-
 theorem nsmul_comp (n : ℕ) : (n • f) ≫ g = n • f ≫ g :=
   map_nsmul (rightComp P g) n f
 #align category_theory.preadditive.nsmul_comp CategoryTheory.Preadditive.nsmul_comp
+-/
 
+#print CategoryTheory.Preadditive.comp_nsmul /-
 theorem comp_nsmul (n : ℕ) : f ≫ (n • g) = n • f ≫ g :=
   map_nsmul (leftComp R f) n g
 #align category_theory.preadditive.comp_nsmul CategoryTheory.Preadditive.comp_nsmul
+-/
 
+#print CategoryTheory.Preadditive.zsmul_comp /-
 theorem zsmul_comp (n : ℤ) : (n • f) ≫ g = n • f ≫ g :=
   map_zsmul (rightComp P g) n f
 #align category_theory.preadditive.zsmul_comp CategoryTheory.Preadditive.zsmul_comp
+-/
 
+#print CategoryTheory.Preadditive.comp_zsmul /-
 theorem comp_zsmul (n : ℤ) : f ≫ (n • g) = n • f ≫ g :=
   map_zsmul (leftComp R f) n g
 #align category_theory.preadditive.comp_zsmul CategoryTheory.Preadditive.comp_zsmul
+-/
 
+/- warning: category_theory.preadditive.comp_sum -> CategoryTheory.Preadditive.comp_sum is a dubious translation:
+lean 3 declaration is
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+but is expected to have type
+  forall {C : Type.{u3}} [_inst_1 : CategoryTheory.Category.{u2, u3} C] [_inst_2 : CategoryTheory.Preadditive.{u2, u3} C _inst_1] {P : C} {Q : C} {R : C} {J : Type.{u1}} (s : Finset.{u1} J) (f : Quiver.Hom.{succ u2, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1)) P Q) (g : J -> (Quiver.Hom.{succ u2, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1)) Q R)), Eq.{succ u2} (Quiver.Hom.{succ u2, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1)) P R) (CategoryTheory.CategoryStruct.comp.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1) P Q R f (Finset.sum.{u2, u1} (Quiver.Hom.{succ u2, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1)) Q R) J (AddCommGroup.toAddCommMonoid.{u2} (Quiver.Hom.{succ u2, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1)) Q R) (CategoryTheory.Preadditive.homGroup.{u2, u3} C _inst_1 _inst_2 Q R)) s (fun (j : J) => g j))) (Finset.sum.{u2, u1} (Quiver.Hom.{succ u2, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1)) P R) J (AddCommGroup.toAddCommMonoid.{u2} (Quiver.Hom.{succ u2, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1)) P R) (CategoryTheory.Preadditive.homGroup.{u2, u3} C _inst_1 _inst_2 P R)) s (fun (j : J) => CategoryTheory.CategoryStruct.comp.{u2, u3} C (CategoryTheory.Category.toCategoryStruct.{u2, u3} C _inst_1) P Q R f (g j)))
+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.comp_sum CategoryTheory.Preadditive.comp_sumₓ'. -/
 @[reassoc.1]
 theorem comp_sum {P Q R : C} {J : Type _} (s : Finset J) (f : P ⟶ Q) (g : J → (Q ⟶ R)) :
     (f ≫ ∑ j in s, g j) = ∑ j in s, f ≫ g j :=
   map_sum (leftComp R f) _ _
 #align category_theory.preadditive.comp_sum CategoryTheory.Preadditive.comp_sum
 
+/- warning: category_theory.preadditive.sum_comp -> CategoryTheory.Preadditive.sum_comp is a dubious translation:
+lean 3 declaration is
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+but is expected to have type
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+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.sum_comp CategoryTheory.Preadditive.sum_compₓ'. -/
 @[reassoc.1]
 theorem sum_comp {P Q R : C} {J : Type _} (s : Finset J) (f : J → (P ⟶ Q)) (g : Q ⟶ R) :
     (∑ j in s, f j) ≫ g = ∑ j in s, f j ≫ g :=
@@ -207,13 +271,21 @@ instance {P Q : C} {f : P ⟶ Q} [Epi f] : Epi (-f) :=
 instance {P Q : C} {f : P ⟶ Q} [Mono f] : Mono (-f) :=
   ⟨fun R g g' H => by rwa [comp_neg, comp_neg, ← neg_comp, ← neg_comp, cancel_mono, neg_inj] at H⟩
 
+#print CategoryTheory.Preadditive.preadditiveHasZeroMorphisms /-
 instance (priority := 100) preadditiveHasZeroMorphisms : HasZeroMorphisms C
     where
   Zero := inferInstance
   comp_zero P Q f R := show leftComp R f 0 = 0 from map_zero _
   zero_comp P Q R f := show rightComp P f 0 = 0 from map_zero _
 #align category_theory.preadditive.preadditive_has_zero_morphisms CategoryTheory.Preadditive.preadditiveHasZeroMorphisms
+-/
 
+/- warning: category_theory.preadditive.module_End_right -> CategoryTheory.Preadditive.moduleEndRight is a dubious translation:
+lean 3 declaration is
+  forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] {X : C} {Y : C}, Module.{u1, u1} (CategoryTheory.End.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1) Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Ring.toSemiring.{u1} (CategoryTheory.End.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1) Y) (CategoryTheory.Preadditive.CategoryTheory.End.ring.{u1, u2} C _inst_1 _inst_2 Y)) (AddCommGroup.toAddCommMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 X Y))
+but is expected to have type
+  forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] {X : C} {Y : C}, Module.{u1, u1} (CategoryTheory.End.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1) Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (CategoryTheory.Preadditive.instSemiringEndToCategoryStruct.{u1, u2} C _inst_1 _inst_2 Y) (AddCommGroup.toAddCommMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 X Y))
+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.module_End_right CategoryTheory.Preadditive.moduleEndRightₓ'. -/
 instance moduleEndRight {X Y : C} : Module (End Y) (X ⟶ Y)
     where
   smul_add r f g := add_comp _ _ _ _ _ _
@@ -222,48 +294,64 @@ instance moduleEndRight {X Y : C} : Module (End Y) (X ⟶ Y)
   zero_smul r := comp_zero
 #align category_theory.preadditive.module_End_right CategoryTheory.Preadditive.moduleEndRight
 
+#print CategoryTheory.Preadditive.mono_of_cancel_zero /-
 theorem mono_of_cancel_zero {Q R : C} (f : Q ⟶ R) (h : ∀ {P : C} (g : P ⟶ Q), g ≫ f = 0 → g = 0) :
     Mono f :=
   ⟨fun P g g' hg =>
     sub_eq_zero.1 <| h _ <| (map_sub (rightComp P f) g g').trans <| sub_eq_zero.2 hg⟩
 #align category_theory.preadditive.mono_of_cancel_zero CategoryTheory.Preadditive.mono_of_cancel_zero
+-/
 
+#print CategoryTheory.Preadditive.mono_iff_cancel_zero /-
 theorem mono_iff_cancel_zero {Q R : C} (f : Q ⟶ R) :
     Mono f ↔ ∀ (P : C) (g : P ⟶ Q), g ≫ f = 0 → g = 0 :=
   ⟨fun m P g => zero_of_comp_mono _, mono_of_cancel_zero f⟩
 #align category_theory.preadditive.mono_iff_cancel_zero CategoryTheory.Preadditive.mono_iff_cancel_zero
+-/
 
+#print CategoryTheory.Preadditive.mono_of_kernel_zero /-
 theorem mono_of_kernel_zero {X Y : C} {f : X ⟶ Y} [HasLimit (parallelPair f 0)]
     (w : kernel.ι f = 0) : Mono f :=
   mono_of_cancel_zero f fun P g h => by rw [← kernel.lift_ι f g h, w, limits.comp_zero]
 #align category_theory.preadditive.mono_of_kernel_zero CategoryTheory.Preadditive.mono_of_kernel_zero
+-/
 
+#print CategoryTheory.Preadditive.epi_of_cancel_zero /-
 theorem epi_of_cancel_zero {P Q : C} (f : P ⟶ Q) (h : ∀ {R : C} (g : Q ⟶ R), f ≫ g = 0 → g = 0) :
     Epi f :=
   ⟨fun R g g' hg => sub_eq_zero.1 <| h _ <| (map_sub (leftComp R f) g g').trans <| sub_eq_zero.2 hg⟩
 #align category_theory.preadditive.epi_of_cancel_zero CategoryTheory.Preadditive.epi_of_cancel_zero
+-/
 
+#print CategoryTheory.Preadditive.epi_iff_cancel_zero /-
 theorem epi_iff_cancel_zero {P Q : C} (f : P ⟶ Q) :
     Epi f ↔ ∀ (R : C) (g : Q ⟶ R), f ≫ g = 0 → g = 0 :=
   ⟨fun e R g => zero_of_epi_comp _, epi_of_cancel_zero f⟩
 #align category_theory.preadditive.epi_iff_cancel_zero CategoryTheory.Preadditive.epi_iff_cancel_zero
+-/
 
+#print CategoryTheory.Preadditive.epi_of_cokernel_zero /-
 theorem epi_of_cokernel_zero {X Y : C} {f : X ⟶ Y} [HasColimit (parallelPair f 0)]
     (w : cokernel.π f = 0) : Epi f :=
   epi_of_cancel_zero f fun P g h => by rw [← cokernel.π_desc f g h, w, limits.zero_comp]
 #align category_theory.preadditive.epi_of_cokernel_zero CategoryTheory.Preadditive.epi_of_cokernel_zero
+-/
 
 namespace IsIso
 
+#print CategoryTheory.Preadditive.IsIso.comp_left_eq_zero /-
 @[simp]
 theorem comp_left_eq_zero [IsIso f] : f ≫ g = 0 ↔ g = 0 := by
   rw [← is_iso.eq_inv_comp, limits.comp_zero]
 #align category_theory.preadditive.is_iso.comp_left_eq_zero CategoryTheory.Preadditive.IsIso.comp_left_eq_zero
+-/
 
+#print CategoryTheory.Preadditive.IsIso.comp_right_eq_zero /-
 @[simp]
 theorem comp_right_eq_zero [IsIso g] : f ≫ g = 0 ↔ f = 0 := by
   rw [← is_iso.eq_comp_inv, limits.zero_comp]
 #align category_theory.preadditive.is_iso.comp_right_eq_zero CategoryTheory.Preadditive.IsIso.comp_right_eq_zero
+-/
 
 end IsIso
 
@@ -271,15 +359,19 @@ open ZeroObject
 
 variable [HasZeroObject C]
 
+#print CategoryTheory.Preadditive.mono_of_kernel_iso_zero /-
 theorem mono_of_kernel_iso_zero {X Y : C} {f : X ⟶ Y} [HasLimit (parallelPair f 0)]
     (w : kernel f ≅ 0) : Mono f :=
   mono_of_kernel_zero (zero_of_source_iso_zero _ w)
 #align category_theory.preadditive.mono_of_kernel_iso_zero CategoryTheory.Preadditive.mono_of_kernel_iso_zero
+-/
 
+#print CategoryTheory.Preadditive.epi_of_cokernel_iso_zero /-
 theorem epi_of_cokernel_iso_zero {X Y : C} {f : X ⟶ Y} [HasColimit (parallelPair f 0)]
     (w : cokernel f ≅ 0) : Epi f :=
   epi_of_cokernel_zero (zero_of_target_iso_zero _ w)
 #align category_theory.preadditive.epi_of_cokernel_iso_zero CategoryTheory.Preadditive.epi_of_cokernel_iso_zero
+-/
 
 end Preadditive
 
@@ -291,33 +383,69 @@ section
 
 variable {X Y : C} {f : X ⟶ Y} {g : X ⟶ Y}
 
+/- warning: category_theory.preadditive.fork_of_kernel_fork -> CategoryTheory.Preadditive.forkOfKernelFork is a dubious translation:
+lean 3 declaration is
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+but is expected to have type
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+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.fork_of_kernel_fork CategoryTheory.Preadditive.forkOfKernelForkₓ'. -/
 /-- Map a kernel cone on the difference of two morphisms to the equalizer fork. -/
 @[simps pt]
 def forkOfKernelFork (c : KernelFork (f - g)) : Fork f g :=
   Fork.ofι c.ι <| by rw [← sub_eq_zero, ← comp_sub, c.condition]
 #align category_theory.preadditive.fork_of_kernel_fork CategoryTheory.Preadditive.forkOfKernelFork
 
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+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.fork_of_kernel_fork_ι CategoryTheory.Preadditive.forkOfKernelFork_ιₓ'. -/
 @[simp]
 theorem forkOfKernelFork_ι (c : KernelFork (f - g)) : (forkOfKernelFork c).ι = c.ι :=
   rfl
 #align category_theory.preadditive.fork_of_kernel_fork_ι CategoryTheory.Preadditive.forkOfKernelFork_ι
 
+/- warning: category_theory.preadditive.kernel_fork_of_fork -> CategoryTheory.Preadditive.kernelForkOfFork is a dubious translation:
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+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.kernel_fork_of_fork CategoryTheory.Preadditive.kernelForkOfForkₓ'. -/
 /-- Map any equalizer fork to a cone on the difference of the two morphisms. -/
 def kernelForkOfFork (c : Fork f g) : KernelFork (f - g) :=
   Fork.ofι c.ι <| by rw [comp_sub, comp_zero, sub_eq_zero, c.condition]
 #align category_theory.preadditive.kernel_fork_of_fork CategoryTheory.Preadditive.kernelForkOfFork
 
+/- warning: category_theory.preadditive.kernel_fork_of_fork_ι -> CategoryTheory.Preadditive.kernelForkOfFork_ι is a dubious translation:
+lean 3 declaration is
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+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.kernel_fork_of_fork_ι CategoryTheory.Preadditive.kernelForkOfFork_ιₓ'. -/
 @[simp]
 theorem kernelForkOfFork_ι (c : Fork f g) : (kernelForkOfFork c).ι = c.ι :=
   rfl
 #align category_theory.preadditive.kernel_fork_of_fork_ι CategoryTheory.Preadditive.kernelForkOfFork_ι
 
+/- warning: category_theory.preadditive.kernel_fork_of_fork_of_ι -> CategoryTheory.Preadditive.kernelForkOfFork_ofι is a dubious translation:
+lean 3 declaration is
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+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.kernel_fork_of_fork_of_ι CategoryTheory.Preadditive.kernelForkOfFork_ofιₓ'. -/
 @[simp]
 theorem kernelForkOfFork_ofι {P : C} (ι : P ⟶ X) (w : ι ≫ f = ι ≫ g) :
     kernelForkOfFork (Fork.ofι ι w) = KernelFork.ofι ι (by simp [w]) :=
   rfl
 #align category_theory.preadditive.kernel_fork_of_fork_of_ι CategoryTheory.Preadditive.kernelForkOfFork_ofι
 
+/- warning: category_theory.preadditive.is_limit_fork_of_kernel_fork -> CategoryTheory.Preadditive.isLimitForkOfKernelFork is a dubious translation:
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+but is expected to have type
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+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.is_limit_fork_of_kernel_fork CategoryTheory.Preadditive.isLimitForkOfKernelForkₓ'. -/
 /-- A kernel of `f - g` is an equalizer of `f` and `g`. -/
 def isLimitForkOfKernelFork {c : KernelFork (f - g)} (i : IsLimit c) :
     IsLimit (forkOfKernelFork c) :=
@@ -325,12 +453,24 @@ def isLimitForkOfKernelFork {c : KernelFork (f - g)} (i : IsLimit c) :
     ⟨i.lift (kernelForkOfFork s), i.fac _ _, fun m h => by apply fork.is_limit.hom_ext i <;> tidy⟩
 #align category_theory.preadditive.is_limit_fork_of_kernel_fork CategoryTheory.Preadditive.isLimitForkOfKernelFork
 
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_inst_1 _inst_2 X Y f g s))
+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.is_limit_fork_of_kernel_fork_lift CategoryTheory.Preadditive.isLimitForkOfKernelFork_liftₓ'. -/
 @[simp]
 theorem isLimitForkOfKernelFork_lift {c : KernelFork (f - g)} (i : IsLimit c) (s : Fork f g) :
     (isLimitForkOfKernelFork i).lift s = i.lift (kernelForkOfFork s) :=
   rfl
 #align category_theory.preadditive.is_limit_fork_of_kernel_fork_lift CategoryTheory.Preadditive.isLimitForkOfKernelFork_lift
 
+/- warning: category_theory.preadditive.is_limit_kernel_fork_of_fork -> CategoryTheory.Preadditive.isLimitKernelForkOfFork is a dubious translation:
+lean 3 declaration is
+  forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] {X : C} {Y : C} {f : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y} {g : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y} {c : CategoryTheory.Limits.Fork.{u1, u2} C _inst_1 X Y f g}, (CategoryTheory.Limits.IsLimit.{0, u1, 0, u2} CategoryTheory.Limits.WalkingParallelPair CategoryTheory.Limits.walkingParallelPairHomCategory C _inst_1 (CategoryTheory.Limits.parallelPair.{u1, u2} C _inst_1 X Y f g) c) -> (CategoryTheory.Limits.IsLimit.{0, u1, 0, u2} CategoryTheory.Limits.WalkingParallelPair CategoryTheory.Limits.walkingParallelPairHomCategory C _inst_1 (CategoryTheory.Limits.parallelPair.{u1, u2} C _inst_1 X Y (HSub.hSub.{u1, u1, u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (instHSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (SubNegMonoid.toHasSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddGroup.toSubNegMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddCommGroup.toAddGroup.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 X Y))))) f g) (OfNat.ofNat.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) 0 (OfNat.mk.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) 0 (Zero.zero.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (CategoryTheory.Limits.HasZeroMorphisms.hasZero.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) X Y))))) (CategoryTheory.Preadditive.kernelForkOfFork.{u1, u2} C _inst_1 _inst_2 X Y f g c))
+but is expected to have type
+  forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] {X : C} {Y : C} {f : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y} {g : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y} {c : CategoryTheory.Limits.Fork.{u1, u2} C _inst_1 X Y f g}, (CategoryTheory.Limits.IsLimit.{0, u1, 0, u2} CategoryTheory.Limits.WalkingParallelPair CategoryTheory.Limits.walkingParallelPairHomCategory C _inst_1 (CategoryTheory.Limits.parallelPair.{u1, u2} C _inst_1 X Y f g) c) -> (CategoryTheory.Limits.IsLimit.{0, u1, 0, u2} CategoryTheory.Limits.WalkingParallelPair CategoryTheory.Limits.walkingParallelPairHomCategory C _inst_1 (CategoryTheory.Limits.parallelPair.{u1, u2} C _inst_1 X Y (HSub.hSub.{u1, u1, u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (instHSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (SubNegMonoid.toSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddGroup.toSubNegMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddCommGroup.toAddGroup.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 X Y))))) f g) (OfNat.ofNat.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) 0 (Zero.toOfNat0.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (CategoryTheory.Limits.HasZeroMorphisms.Zero.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) X Y)))) (CategoryTheory.Preadditive.kernelForkOfFork.{u1, u2} C _inst_1 _inst_2 X Y f g c))
+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.is_limit_kernel_fork_of_fork CategoryTheory.Preadditive.isLimitKernelForkOfForkₓ'. -/
 /-- An equalizer of `f` and `g` is a kernel of `f - g`. -/
 def isLimitKernelForkOfFork {c : Fork f g} (i : IsLimit c) : IsLimit (kernelForkOfFork c) :=
   Fork.IsLimit.mk' _ fun s =>
@@ -339,6 +479,12 @@ def isLimitKernelForkOfFork {c : Fork f g} (i : IsLimit c) : IsLimit (kernelFork
 
 variable (f g)
 
+/- warning: category_theory.preadditive.has_equalizer_of_has_kernel -> CategoryTheory.Preadditive.hasEqualizer_of_hasKernel is a dubious translation:
+lean 3 declaration is
+  forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] {X : C} {Y : C} (f : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (g : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) [_inst_3 : CategoryTheory.Limits.HasKernel.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) X Y (HSub.hSub.{u1, u1, u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (instHSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (SubNegMonoid.toHasSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddGroup.toSubNegMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddCommGroup.toAddGroup.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 X Y))))) f g)], CategoryTheory.Limits.HasEqualizer.{u1, u2} C _inst_1 X Y f g
+but is expected to have type
+  forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] {X : C} {Y : C} (f : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (g : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) [_inst_3 : CategoryTheory.Limits.HasKernel.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) X Y (HSub.hSub.{u1, u1, u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (instHSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (SubNegMonoid.toSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddGroup.toSubNegMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddCommGroup.toAddGroup.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 X Y))))) f g)], CategoryTheory.Limits.HasEqualizer.{u1, u2} C _inst_1 X Y f g
+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.has_equalizer_of_has_kernel CategoryTheory.Preadditive.hasEqualizer_of_hasKernelₓ'. -/
 /-- A preadditive category has an equalizer for `f` and `g` if it has a kernel for `f - g`. -/
 theorem hasEqualizer_of_hasKernel [HasKernel (f - g)] : HasEqualizer f g :=
   HasLimit.mk
@@ -346,6 +492,12 @@ theorem hasEqualizer_of_hasKernel [HasKernel (f - g)] : HasEqualizer f g :=
       IsLimit := isLimitForkOfKernelFork (equalizerIsEqualizer (f - g) 0) }
 #align category_theory.preadditive.has_equalizer_of_has_kernel CategoryTheory.Preadditive.hasEqualizer_of_hasKernel
 
+/- warning: category_theory.preadditive.has_kernel_of_has_equalizer -> CategoryTheory.Preadditive.hasKernel_of_hasEqualizer is a dubious translation:
+lean 3 declaration is
+  forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] {X : C} {Y : C} (f : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (g : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) [_inst_3 : CategoryTheory.Limits.HasEqualizer.{u1, u2} C _inst_1 X Y f g], CategoryTheory.Limits.HasKernel.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) X Y (HSub.hSub.{u1, u1, u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (instHSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (SubNegMonoid.toHasSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddGroup.toSubNegMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddCommGroup.toAddGroup.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 X Y))))) f g)
+but is expected to have type
+  forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] {X : C} {Y : C} (f : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (g : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) [_inst_3 : CategoryTheory.Limits.HasEqualizer.{u1, u2} C _inst_1 X Y f g], CategoryTheory.Limits.HasKernel.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) X Y (HSub.hSub.{u1, u1, u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (instHSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (SubNegMonoid.toSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddGroup.toSubNegMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddCommGroup.toAddGroup.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 X Y))))) f g)
+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.has_kernel_of_has_equalizer CategoryTheory.Preadditive.hasKernel_of_hasEqualizerₓ'. -/
 /-- A preadditive category has a kernel for `f - g` if it has an equalizer for `f` and `g`. -/
 theorem hasKernel_of_hasEqualizer [HasEqualizer f g] : HasKernel (f - g) :=
   HasLimit.mk
@@ -355,34 +507,70 @@ theorem hasKernel_of_hasEqualizer [HasEqualizer f g] : HasKernel (f - g) :=
 
 variable {f g}
 
+/- warning: category_theory.preadditive.cofork_of_cokernel_cofork -> CategoryTheory.Preadditive.coforkOfCokernelCofork is a dubious translation:
+lean 3 declaration is
+  forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] {X : C} {Y : C} {f : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y} {g : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y}, (CategoryTheory.Limits.CokernelCofork.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) X Y (HSub.hSub.{u1, u1, u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (instHSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (SubNegMonoid.toHasSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddGroup.toSubNegMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddCommGroup.toAddGroup.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 X Y))))) f g)) -> (CategoryTheory.Limits.Cofork.{u1, u2} C _inst_1 X Y f g)
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+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.cofork_of_cokernel_cofork CategoryTheory.Preadditive.coforkOfCokernelCoforkₓ'. -/
 /-- Map a cokernel cocone on the difference of two morphisms to the coequalizer cofork. -/
 @[simps pt]
 def coforkOfCokernelCofork (c : CokernelCofork (f - g)) : Cofork f g :=
   Cofork.ofπ c.π <| by rw [← sub_eq_zero, ← sub_comp, c.condition]
 #align category_theory.preadditive.cofork_of_cokernel_cofork CategoryTheory.Preadditive.coforkOfCokernelCofork
 
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+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.cofork_of_cokernel_cofork_π CategoryTheory.Preadditive.coforkOfCokernelCofork_πₓ'. -/
 @[simp]
 theorem coforkOfCokernelCofork_π (c : CokernelCofork (f - g)) :
     (coforkOfCokernelCofork c).π = c.π :=
   rfl
 #align category_theory.preadditive.cofork_of_cokernel_cofork_π CategoryTheory.Preadditive.coforkOfCokernelCofork_π
 
+/- warning: category_theory.preadditive.cokernel_cofork_of_cofork -> CategoryTheory.Preadditive.cokernelCoforkOfCofork is a dubious translation:
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+but is expected to have type
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+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.cokernel_cofork_of_cofork CategoryTheory.Preadditive.cokernelCoforkOfCoforkₓ'. -/
 /-- Map any coequalizer cofork to a cocone on the difference of the two morphisms. -/
 def cokernelCoforkOfCofork (c : Cofork f g) : CokernelCofork (f - g) :=
   Cofork.ofπ c.π <| by rw [sub_comp, zero_comp, sub_eq_zero, c.condition]
 #align category_theory.preadditive.cokernel_cofork_of_cofork CategoryTheory.Preadditive.cokernelCoforkOfCofork
 
+/- warning: category_theory.preadditive.cokernel_cofork_of_cofork_π -> CategoryTheory.Preadditive.cokernelCoforkOfCofork_π is a dubious translation:
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+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.cokernel_cofork_of_cofork_π CategoryTheory.Preadditive.cokernelCoforkOfCofork_πₓ'. -/
 @[simp]
 theorem cokernelCoforkOfCofork_π (c : Cofork f g) : (cokernelCoforkOfCofork c).π = c.π :=
   rfl
 #align category_theory.preadditive.cokernel_cofork_of_cofork_π CategoryTheory.Preadditive.cokernelCoforkOfCofork_π
 
+/- warning: category_theory.preadditive.cokernel_cofork_of_cofork_of_π -> CategoryTheory.Preadditive.cokernelCoforkOfCofork_ofπ is a dubious translation:
+lean 3 declaration is
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+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.cokernel_cofork_of_cofork_of_π CategoryTheory.Preadditive.cokernelCoforkOfCofork_ofπₓ'. -/
 @[simp]
 theorem cokernelCoforkOfCofork_ofπ {P : C} (π : Y ⟶ P) (w : f ≫ π = g ≫ π) :
     cokernelCoforkOfCofork (Cofork.ofπ π w) = CokernelCofork.ofπ π (by simp [w]) :=
   rfl
 #align category_theory.preadditive.cokernel_cofork_of_cofork_of_π CategoryTheory.Preadditive.cokernelCoforkOfCofork_ofπ
 
+/- warning: category_theory.preadditive.is_colimit_cofork_of_cokernel_cofork -> CategoryTheory.Preadditive.isColimitCoforkOfCokernelCofork is a dubious translation:
+lean 3 declaration is
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+but is expected to have type
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+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.is_colimit_cofork_of_cokernel_cofork CategoryTheory.Preadditive.isColimitCoforkOfCokernelCoforkₓ'. -/
 /-- A cokernel of `f - g` is a coequalizer of `f` and `g`. -/
 def isColimitCoforkOfCokernelCofork {c : CokernelCofork (f - g)} (i : IsColimit c) :
     IsColimit (coforkOfCokernelCofork c) :=
@@ -391,6 +579,12 @@ def isColimitCoforkOfCokernelCofork {c : CokernelCofork (f - g)} (i : IsColimit
       apply cofork.is_colimit.hom_ext i <;> tidy⟩
 #align category_theory.preadditive.is_colimit_cofork_of_cokernel_cofork CategoryTheory.Preadditive.isColimitCoforkOfCokernelCofork
 
+/- warning: category_theory.preadditive.is_colimit_cofork_of_cokernel_cofork_desc -> CategoryTheory.Preadditive.isColimitCoforkOfCokernelCofork_desc is a dubious translation:
+lean 3 declaration is
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+but is expected to have type
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(CategoryTheory.Preadditive.cokernelCoforkOfCofork.{u1, u2} C _inst_1 _inst_2 X Y f g s))
+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.is_colimit_cofork_of_cokernel_cofork_desc CategoryTheory.Preadditive.isColimitCoforkOfCokernelCofork_descₓ'. -/
 @[simp]
 theorem isColimitCoforkOfCokernelCofork_desc {c : CokernelCofork (f - g)} (i : IsColimit c)
     (s : Cofork f g) :
@@ -398,6 +592,12 @@ theorem isColimitCoforkOfCokernelCofork_desc {c : CokernelCofork (f - g)} (i : I
   rfl
 #align category_theory.preadditive.is_colimit_cofork_of_cokernel_cofork_desc CategoryTheory.Preadditive.isColimitCoforkOfCokernelCofork_desc
 
+/- warning: category_theory.preadditive.is_colimit_cokernel_cofork_of_cofork -> CategoryTheory.Preadditive.isColimitCokernelCoforkOfCofork is a dubious translation:
+lean 3 declaration is
+  forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] {X : C} {Y : C} {f : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y} {g : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y} {c : CategoryTheory.Limits.Cofork.{u1, u2} C _inst_1 X Y f g}, (CategoryTheory.Limits.IsColimit.{0, u1, 0, u2} CategoryTheory.Limits.WalkingParallelPair CategoryTheory.Limits.walkingParallelPairHomCategory C _inst_1 (CategoryTheory.Limits.parallelPair.{u1, u2} C _inst_1 X Y f g) c) -> (CategoryTheory.Limits.IsColimit.{0, u1, 0, u2} CategoryTheory.Limits.WalkingParallelPair CategoryTheory.Limits.walkingParallelPairHomCategory C _inst_1 (CategoryTheory.Limits.parallelPair.{u1, u2} C _inst_1 X Y (HSub.hSub.{u1, u1, u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (instHSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (SubNegMonoid.toHasSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddGroup.toSubNegMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddCommGroup.toAddGroup.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 X Y))))) f g) (OfNat.ofNat.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) 0 (OfNat.mk.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) 0 (Zero.zero.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (CategoryTheory.Limits.HasZeroMorphisms.hasZero.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) X Y))))) (CategoryTheory.Preadditive.cokernelCoforkOfCofork.{u1, u2} C _inst_1 _inst_2 X Y f g c))
+but is expected to have type
+  forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] {X : C} {Y : C} {f : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y} {g : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y} {c : CategoryTheory.Limits.Cofork.{u1, u2} C _inst_1 X Y f g}, (CategoryTheory.Limits.IsColimit.{0, u1, 0, u2} CategoryTheory.Limits.WalkingParallelPair CategoryTheory.Limits.walkingParallelPairHomCategory C _inst_1 (CategoryTheory.Limits.parallelPair.{u1, u2} C _inst_1 X Y f g) c) -> (CategoryTheory.Limits.IsColimit.{0, u1, 0, u2} CategoryTheory.Limits.WalkingParallelPair CategoryTheory.Limits.walkingParallelPairHomCategory C _inst_1 (CategoryTheory.Limits.parallelPair.{u1, u2} C _inst_1 X Y (HSub.hSub.{u1, u1, u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (instHSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (SubNegMonoid.toSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddGroup.toSubNegMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddCommGroup.toAddGroup.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 X Y))))) f g) (OfNat.ofNat.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) 0 (Zero.toOfNat0.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (CategoryTheory.Limits.HasZeroMorphisms.Zero.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) X Y)))) (CategoryTheory.Preadditive.cokernelCoforkOfCofork.{u1, u2} C _inst_1 _inst_2 X Y f g c))
+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.is_colimit_cokernel_cofork_of_cofork CategoryTheory.Preadditive.isColimitCokernelCoforkOfCoforkₓ'. -/
 /-- A coequalizer of `f` and `g` is a cokernel of `f - g`. -/
 def isColimitCokernelCoforkOfCofork {c : Cofork f g} (i : IsColimit c) :
     IsColimit (cokernelCoforkOfCofork c) :=
@@ -408,6 +608,12 @@ def isColimitCokernelCoforkOfCofork {c : Cofork f g} (i : IsColimit c) :
 
 variable (f g)
 
+/- warning: category_theory.preadditive.has_coequalizer_of_has_cokernel -> CategoryTheory.Preadditive.hasCoequalizer_of_hasCokernel is a dubious translation:
+lean 3 declaration is
+  forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] {X : C} {Y : C} (f : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (g : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) [_inst_3 : CategoryTheory.Limits.HasCokernel.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) X Y (HSub.hSub.{u1, u1, u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (instHSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (SubNegMonoid.toHasSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddGroup.toSubNegMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddCommGroup.toAddGroup.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 X Y))))) f g)], CategoryTheory.Limits.HasCoequalizer.{u1, u2} C _inst_1 X Y f g
+but is expected to have type
+  forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] {X : C} {Y : C} (f : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (g : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) [_inst_3 : CategoryTheory.Limits.HasCokernel.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) X Y (HSub.hSub.{u1, u1, u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (instHSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (SubNegMonoid.toSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddGroup.toSubNegMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddCommGroup.toAddGroup.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 X Y))))) f g)], CategoryTheory.Limits.HasCoequalizer.{u1, u2} C _inst_1 X Y f g
+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.has_coequalizer_of_has_cokernel CategoryTheory.Preadditive.hasCoequalizer_of_hasCokernelₓ'. -/
 /-- A preadditive category has a coequalizer for `f` and `g` if it has a cokernel for `f - g`. -/
 theorem hasCoequalizer_of_hasCokernel [HasCokernel (f - g)] : HasCoequalizer f g :=
   HasColimit.mk
@@ -415,6 +621,12 @@ theorem hasCoequalizer_of_hasCokernel [HasCokernel (f - g)] : HasCoequalizer f g
       IsColimit := isColimitCoforkOfCokernelCofork (coequalizerIsCoequalizer (f - g) 0) }
 #align category_theory.preadditive.has_coequalizer_of_has_cokernel CategoryTheory.Preadditive.hasCoequalizer_of_hasCokernel
 
+/- warning: category_theory.preadditive.has_cokernel_of_has_coequalizer -> CategoryTheory.Preadditive.hasCokernel_of_hasCoequalizer is a dubious translation:
+lean 3 declaration is
+  forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] {X : C} {Y : C} (f : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (g : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) [_inst_3 : CategoryTheory.Limits.HasCoequalizer.{u1, u2} C _inst_1 X Y f g], CategoryTheory.Limits.HasCokernel.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) X Y (HSub.hSub.{u1, u1, u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (instHSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (SubNegMonoid.toHasSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddGroup.toSubNegMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddCommGroup.toAddGroup.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 X Y))))) f g)
+but is expected to have type
+  forall {C : Type.{u2}} [_inst_1 : CategoryTheory.Category.{u1, u2} C] [_inst_2 : CategoryTheory.Preadditive.{u1, u2} C _inst_1] {X : C} {Y : C} (f : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (g : Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) [_inst_3 : CategoryTheory.Limits.HasCoequalizer.{u1, u2} C _inst_1 X Y f g], CategoryTheory.Limits.HasCokernel.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) X Y (HSub.hSub.{u1, u1, u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (instHSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (SubNegMonoid.toSub.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddGroup.toSubNegMonoid.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (AddCommGroup.toAddGroup.{u1} (Quiver.Hom.{succ u1, u2} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) X Y) (CategoryTheory.Preadditive.homGroup.{u1, u2} C _inst_1 _inst_2 X Y))))) f g)
+Case conversion may be inaccurate. Consider using '#align category_theory.preadditive.has_cokernel_of_has_coequalizer CategoryTheory.Preadditive.hasCokernel_of_hasCoequalizerₓ'. -/
 /-- A preadditive category has a cokernel for `f - g` if it has a coequalizer for `f` and `g`. -/
 theorem hasCokernel_of_hasCoequalizer [HasCoequalizer f g] : HasCokernel (f - g) :=
   HasColimit.mk
@@ -424,15 +636,19 @@ theorem hasCokernel_of_hasCoequalizer [HasCoequalizer f g] : HasCokernel (f - g)
 
 end
 
+#print CategoryTheory.Preadditive.hasEqualizers_of_hasKernels /-
 /-- If a preadditive category has all kernels, then it also has all equalizers. -/
 theorem hasEqualizers_of_hasKernels [HasKernels C] : HasEqualizers C :=
   @hasEqualizers_of_hasLimit_parallelPair _ _ fun _ _ f g => hasEqualizer_of_hasKernel f g
 #align category_theory.preadditive.has_equalizers_of_has_kernels CategoryTheory.Preadditive.hasEqualizers_of_hasKernels
+-/
 
+#print CategoryTheory.Preadditive.hasCoequalizers_of_hasCokernels /-
 /-- If a preadditive category has all cokernels, then it also has all coequalizers. -/
 theorem hasCoequalizers_of_hasCokernels [HasCokernels C] : HasCoequalizers C :=
   @hasCoequalizers_of_hasColimit_parallelPair _ _ fun _ _ f g => hasCoequalizer_of_hasCokernel f g
 #align category_theory.preadditive.has_coequalizers_of_has_cokernels CategoryTheory.Preadditive.hasCoequalizers_of_hasCokernels
+-/
 
 end Equalizers

829895f1

bump to nightly-2023-03-08-08

mathlib commit https://github.com/leanprover-community/mathlib/commit/38f16f960f5006c6c0c2bac7b0aba5273188f4e5

fc92a682

Diff

@@ -210,8 +210,8 @@ instance {P Q : C} {f : P ⟶ Q} [Mono f] : Mono (-f) :=
 instance (priority := 100) preadditiveHasZeroMorphisms : HasZeroMorphisms C
     where
   Zero := inferInstance
-  comp_zero' P Q f R := show leftComp R f 0 = 0 from map_zero _
-  zero_comp' P Q R f := show rightComp P f 0 = 0 from map_zero _
+  comp_zero P Q f R := show leftComp R f 0 = 0 from map_zero _
+  zero_comp P Q R f := show rightComp P f 0 = 0 from map_zero _
 #align category_theory.preadditive.preadditive_has_zero_morphisms CategoryTheory.Preadditive.preadditiveHasZeroMorphisms
 
 instance moduleEndRight {X Y : C} : Module (End Y) (X ⟶ Y)

829895f1

bump to nightly-2023-02-28-22

mathlib commit https://github.com/leanprover-community/mathlib/commit/9da1b3534b65d9661eb8f42443598a92bbb49211

1fb1623f

Diff

@@ -292,7 +292,7 @@ section
 variable {X Y : C} {f : X ⟶ Y} {g : X ⟶ Y}
 
 /-- Map a kernel cone on the difference of two morphisms to the equalizer fork. -/
-@[simps x]
+@[simps pt]
 def forkOfKernelFork (c : KernelFork (f - g)) : Fork f g :=
   Fork.ofι c.ι <| by rw [← sub_eq_zero, ← comp_sub, c.condition]
 #align category_theory.preadditive.fork_of_kernel_fork CategoryTheory.Preadditive.forkOfKernelFork
@@ -356,7 +356,7 @@ theorem hasKernel_of_hasEqualizer [HasEqualizer f g] : HasKernel (f - g) :=
 variable {f g}
 
 /-- Map a cokernel cocone on the difference of two morphisms to the coequalizer cofork. -/
-@[simps x]
+@[simps pt]
 def coforkOfCokernelCofork (c : CokernelCofork (f - g)) : Cofork f g :=
   Cofork.ofπ c.π <| by rw [← sub_eq_zero, ← sub_comp, c.condition]
 #align category_theory.preadditive.cofork_of_cokernel_cofork CategoryTheory.Preadditive.coforkOfCokernelCofork

829895f1

bump to nightly-2023-02-21-16

mathlib commit https://github.com/leanprover-community/mathlib/commit/bd9851ca476957ea4549eb19b40e7b5ade9428cc

1107b979

Changes in mathlib4

mathlib3

mathlib4

829895f1

chore: split Algebra.Module.Basic (#12501)

Similar to #12486, which did this for Algebra.Algebra.Basic.

Splits Algebra.Module.Defs off Algebra.Module.Basic. Most imports only need the Defs file, which has significantly smaller imports. The remaining Algebra.Module.Basic is now a grab-bag of unrelated results, and should probably be split further or rehomed.

This is mostly motivated by the wasted effort during minimization upon encountering Algebra.Module.Basic.

Co-authored-by: Scott Morrison <scott.morrison@gmail.com> Co-authored-by: Ruben Van de Velde <65514131+Ruben-VandeVelde@users.noreply.github.com>

7d5102df

Diff

@@ -5,7 +5,7 @@ Authors: Markus Himmel, Jakob von Raumer
 -/
 import Mathlib.Algebra.BigOperators.Basic
 import Mathlib.Algebra.Group.Hom.Defs
-import Mathlib.Algebra.Module.Basic
+import Mathlib.Algebra.Module.Defs
 import Mathlib.CategoryTheory.Endomorphism
 import Mathlib.CategoryTheory.Limits.Shapes.Kernels

829895f1

feat(Algebra/Homology): compatibilities of homology and shifts (#11782)

This PR studies the compatibilities of homology and shifts. This results into ShiftSequence instances for the homology functor in the CochainComplex and HomotopyCategory namespaces.

a6439961

Diff

@@ -475,10 +475,10 @@ instance : SMul (Units ℤ) (X ≅ Y) where
         simp only [comp_zsmul, zsmul_comp, smul_smul, Units.mul_inv, one_smul, e.inv_hom_id] }
 
 @[simp]
-lemma smul_iso_hom (a : Units ℤ) (e : X ≅ Y) : (a • e).hom = (a : ℤ) • e.hom := rfl
+lemma smul_iso_hom (a : Units ℤ) (e : X ≅ Y) : (a • e).hom = a • e.hom := rfl
 
 @[simp]
-lemma smul_iso_inv (a : Units ℤ) (e : X ≅ Y) : (a • e).inv = ((a⁻¹ : Units ℤ) : ℤ) • e.inv := rfl
+lemma smul_iso_inv (a : Units ℤ) (e : X ≅ Y) : (a • e).inv = a⁻¹ • e.inv := rfl
 
 instance : Neg (X ≅ Y) where
   neg e :=

829895f1

style: homogenise porting notes (#11145)

Homogenises porting notes via capitalisation and addition of whitespace.

It makes the following changes:

converts "--porting note" into "-- Porting note";
converts "porting note" into "Porting note".

8be0b69c

Diff

@@ -203,7 +203,7 @@ instance (priority := 100) preadditiveHasZeroMorphisms : HasZeroMorphisms C wher
   zero_comp P _ _ f := show rightComp P f 0 = 0 from map_zero _
 #align category_theory.preadditive.preadditive_has_zero_morphisms CategoryTheory.Preadditive.preadditiveHasZeroMorphisms
 
-/--Porting note: adding this before the ring instance allowed moduleEndRight to find
+/-- Porting note: adding this before the ring instance allowed moduleEndRight to find
 the correct Monoid structure on End. Moved both down after preadditiveHasZeroMorphisms
 to make use of them -/
 instance {X : C} : Semiring (End X) :=

829895f1

fix: decapitalize names of proof-valued fields (#8509)

Only Prop-values fields should be capitalized, not P-valued fields where P is Prop-valued.

Rather than fixing Nonempty := in constructors, I just deleted the line as the instance can almost always be found automatically.

e2426ff5

Diff

@@ -198,7 +198,7 @@ instance {P Q : C} {f : P ⟶ Q} [Mono f] : Mono (-f) :=
   ⟨fun g g' H => by rwa [comp_neg, comp_neg, ← neg_comp, ← neg_comp, cancel_mono, neg_inj] at H⟩
 
 instance (priority := 100) preadditiveHasZeroMorphisms : HasZeroMorphisms C where
-  Zero := inferInstance
+  zero := inferInstance
   comp_zero f R := show leftComp R f 0 = 0 from map_zero _
   zero_comp P _ _ f := show rightComp P f 0 = 0 from map_zero _
 #align category_theory.preadditive.preadditive_has_zero_morphisms CategoryTheory.Preadditive.preadditiveHasZeroMorphisms

829895f1

refactor(Algebra/Hom): transpose Hom and file name (#8095)

I believe the file defining a type of morphisms belongs alongside the file defining the structure this morphism works on. So I would like to reorganize the files in the Mathlib.Algebra.Hom folder so that e.g. Mathlib.Algebra.Hom.Ring becomes Mathlib.Algebra.Ring.Hom and Mathlib.Algebra.Hom.NonUnitalAlg becomes Mathlib.Algebra.Algebra.NonUnitalHom.

While fixing the imports I went ahead and sorted them for good luck.

The full list of changes is: renamed: Mathlib/Algebra/Hom/NonUnitalAlg.lean -> Mathlib/Algebra/Algebra/NonUnitalHom.lean renamed: Mathlib/Algebra/Hom/Aut.lean -> Mathlib/Algebra/Group/Aut.lean renamed: Mathlib/Algebra/Hom/Commute.lean -> Mathlib/Algebra/Group/Commute/Hom.lean renamed: Mathlib/Algebra/Hom/Embedding.lean -> Mathlib/Algebra/Group/Embedding.lean renamed: Mathlib/Algebra/Hom/Equiv/Basic.lean -> Mathlib/Algebra/Group/Equiv/Basic.lean renamed: Mathlib/Algebra/Hom/Equiv/TypeTags.lean -> Mathlib/Algebra/Group/Equiv/TypeTags.lean renamed: Mathlib/Algebra/Hom/Equiv/Units/Basic.lean -> Mathlib/Algebra/Group/Units/Equiv.lean renamed: Mathlib/Algebra/Hom/Equiv/Units/GroupWithZero.lean -> Mathlib/Algebra/GroupWithZero/Units/Equiv.lean renamed: Mathlib/Algebra/Hom/Freiman.lean -> Mathlib/Algebra/Group/Freiman.lean renamed: Mathlib/Algebra/Hom/Group/Basic.lean -> Mathlib/Algebra/Group/Hom/Basic.lean renamed: Mathlib/Algebra/Hom/Group/Defs.lean -> Mathlib/Algebra/Group/Hom/Defs.lean renamed: Mathlib/Algebra/Hom/GroupAction.lean -> Mathlib/GroupTheory/GroupAction/Hom.lean renamed: Mathlib/Algebra/Hom/GroupInstances.lean -> Mathlib/Algebra/Group/Hom/Instances.lean renamed: Mathlib/Algebra/Hom/Iterate.lean -> Mathlib/Algebra/GroupPower/IterateHom.lean renamed: Mathlib/Algebra/Hom/Centroid.lean -> Mathlib/Algebra/Ring/CentroidHom.lean renamed: Mathlib/Algebra/Hom/Ring/Basic.lean -> Mathlib/Algebra/Ring/Hom/Basic.lean renamed: Mathlib/Algebra/Hom/Ring/Defs.lean -> Mathlib/Algebra/Ring/Hom/Defs.lean renamed: Mathlib/Algebra/Hom/Units.lean -> Mathlib/Algebra/Group/Units/Hom.lean

Zulip thread: https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Reorganizing.20.60Mathlib.2EAlgebra.2EHom.60

92fe122e

Diff

@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Markus Himmel, Jakob von Raumer
 -/
 import Mathlib.Algebra.BigOperators.Basic
-import Mathlib.Algebra.Hom.Group.Defs
+import Mathlib.Algebra.Group.Hom.Defs
 import Mathlib.Algebra.Module.Basic
 import Mathlib.CategoryTheory.Endomorphism
 import Mathlib.CategoryTheory.Limits.Shapes.Kernels

829895f1

feat: various criteria for the exactness of short complexes (#7806)

490560e1

Diff

@@ -243,6 +243,15 @@ theorem mono_of_kernel_zero {X Y : C} {f : X ⟶ Y} [HasLimit (parallelPair f 0)
   mono_of_cancel_zero f fun g h => by rw [← kernel.lift_ι f g h, w, Limits.comp_zero]
 #align category_theory.preadditive.mono_of_kernel_zero CategoryTheory.Preadditive.mono_of_kernel_zero
 
+lemma mono_of_isZero_kernel' {X Y : C} {f : X ⟶ Y} (c : KernelFork f) (hc : IsLimit c)
+    (h : IsZero c.pt) : Mono f := mono_of_cancel_zero _ (fun g hg => by
+  obtain ⟨a, ha⟩ := KernelFork.IsLimit.lift' hc _ hg
+  rw [← ha, h.eq_of_tgt a 0, Limits.zero_comp])
+
+lemma mono_of_isZero_kernel {X Y : C} (f : X ⟶ Y) [HasKernel f] (h : IsZero (kernel f)) :
+    Mono f :=
+  mono_of_isZero_kernel' _ (kernelIsKernel _) h
+
 theorem epi_of_cancel_zero {P Q : C} (f : P ⟶ Q) (h : ∀ {R : C} (g : Q ⟶ R), f ≫ g = 0 → g = 0) :
     Epi f :=
   ⟨fun {Z} g g' hg =>
@@ -259,6 +268,15 @@ theorem epi_of_cokernel_zero {X Y : C} {f : X ⟶ Y} [HasColimit (parallelPair f
   epi_of_cancel_zero f fun g h => by rw [← cokernel.π_desc f g h, w, Limits.zero_comp]
 #align category_theory.preadditive.epi_of_cokernel_zero CategoryTheory.Preadditive.epi_of_cokernel_zero
 
+lemma epi_of_isZero_cokernel' {X Y : C} {f : X ⟶ Y} (c : CokernelCofork f) (hc : IsColimit c)
+    (h : IsZero c.pt) : Epi f := epi_of_cancel_zero _ (fun g hg => by
+  obtain ⟨a, ha⟩ := CokernelCofork.IsColimit.desc' hc _ hg
+  rw [← ha, h.eq_of_src a 0, Limits.comp_zero])
+
+lemma epi_of_isZero_cokernel {X Y : C} (f : X ⟶ Y) [HasCokernel f] (h : IsZero (cokernel f)) :
+    Epi f :=
+  epi_of_isZero_cokernel' _ (cokernelIsCokernel _) h
+
 namespace IsIso
 
 @[simp]

829895f1

feat: the pretriangulated structure on the opposite category (#7336)

6f69c1ac

Diff

@@ -443,6 +443,38 @@ theorem hasCoequalizers_of_hasCokernels [HasCokernels C] : HasCoequalizers C :=
 
 end Equalizers
 
+section
+
+variable {C : Type*} [Category C] [Preadditive C] {X Y : C}
+
+instance : SMul (Units ℤ) (X ≅ Y) where
+  smul a e :=
+    { hom := (a : ℤ) • e.hom
+      inv := ((a⁻¹ : Units ℤ) : ℤ) • e.inv
+      hom_inv_id := by
+        simp only [comp_zsmul, zsmul_comp, smul_smul, Units.inv_mul, one_smul, e.hom_inv_id]
+      inv_hom_id := by
+        simp only [comp_zsmul, zsmul_comp, smul_smul, Units.mul_inv, one_smul, e.inv_hom_id] }
+
+@[simp]
+lemma smul_iso_hom (a : Units ℤ) (e : X ≅ Y) : (a • e).hom = (a : ℤ) • e.hom := rfl
+
+@[simp]
+lemma smul_iso_inv (a : Units ℤ) (e : X ≅ Y) : (a • e).inv = ((a⁻¹ : Units ℤ) : ℤ) • e.inv := rfl
+
+instance : Neg (X ≅ Y) where
+  neg e :=
+    { hom := -e.hom
+      inv := -e.inv }
+
+@[simp]
+lemma neg_iso_hom (e : X ≅ Y) : (-e).hom = -e.hom := rfl
+
+@[simp]
+lemma neg_iso_inv (e : X ≅ Y) : (-e).inv = -e.inv := rfl
+
+end
+
 end Preadditive
 
 end CategoryTheory

829895f1

refactor: split Algebra.Hom.Group and Algebra.Hom.Ring (#7094)

Co-authored-by: Scott Morrison <scott.morrison@gmail.com>

260cb506

Diff

@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Markus Himmel, Jakob von Raumer
 -/
 import Mathlib.Algebra.BigOperators.Basic
-import Mathlib.Algebra.Hom.Group
+import Mathlib.Algebra.Hom.Group.Defs
 import Mathlib.Algebra.Module.Basic
 import Mathlib.CategoryTheory.Endomorphism
 import Mathlib.CategoryTheory.Limits.Shapes.Kernels

829895f1

chore: banish Type _ and Sort _ (#6499)

We remove all possible occurences of Type _ and Sort _ in favor of Type* and Sort*.

This has nice performance benefits.

32de3f67

Diff

@@ -180,13 +180,13 @@ theorem comp_zsmul (n : ℤ) : f ≫ (n • g) = n • f ≫ g :=
 #align category_theory.preadditive.comp_zsmul CategoryTheory.Preadditive.comp_zsmul
 
 @[reassoc]
-theorem comp_sum {P Q R : C} {J : Type _} (s : Finset J) (f : P ⟶ Q) (g : J → (Q ⟶ R)) :
+theorem comp_sum {P Q R : C} {J : Type*} (s : Finset J) (f : P ⟶ Q) (g : J → (Q ⟶ R)) :
     (f ≫ ∑ j in s, g j) = ∑ j in s, f ≫ g j :=
   map_sum (leftComp R f) _ _
 #align category_theory.preadditive.comp_sum CategoryTheory.Preadditive.comp_sum
 
 @[reassoc]
-theorem sum_comp {P Q R : C} {J : Type _} (s : Finset J) (f : J → (P ⟶ Q)) (g : Q ⟶ R) :
+theorem sum_comp {P Q R : C} {J : Type*} (s : Finset J) (f : J → (P ⟶ Q)) (g : Q ⟶ R) :
     (∑ j in s, f j) ≫ g = ∑ j in s, f j ≫ g :=
   map_sum (rightComp P g) _ _
 #align category_theory.preadditive.sum_comp CategoryTheory.Preadditive.sum_comp

829895f1

chore: script to replace headers with #align_import statements (#5979)

depends on: #5966

Co-authored-by: Eric Wieser <wieser.eric@gmail.com> Co-authored-by: Scott Morrison <scott.morrison@gmail.com>

89aa3a3b

Diff

@@ -2,11 +2,6 @@
 Copyright (c) 2020 Markus Himmel. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Markus Himmel, Jakob von Raumer
-
-! This file was ported from Lean 3 source module category_theory.preadditive.basic
-! leanprover-community/mathlib commit 829895f162a1f29d0133f4b3538f4cd1fb5bffd3
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathlib.Algebra.BigOperators.Basic
 import Mathlib.Algebra.Hom.Group
@@ -14,6 +9,8 @@ import Mathlib.Algebra.Module.Basic
 import Mathlib.CategoryTheory.Endomorphism
 import Mathlib.CategoryTheory.Limits.Shapes.Kernels
 
+#align_import category_theory.preadditive.basic from "leanprover-community/mathlib"@"829895f162a1f29d0133f4b3538f4cd1fb5bffd3"
+
 /-!
 # Preadditive categories

829895f1

chore: cleanup whitespace (#5988)

Grepping for [^ .:{-] [^ :] and reviewing the results. Once I started I couldn't stop. :-)

Co-authored-by: Scott Morrison <scott.morrison@gmail.com>

12343aa5

Diff

@@ -104,8 +104,8 @@ variable {D : Type u'} (F : D → C)
 
 instance inducedCategory : Preadditive.{v} (InducedCategory C F) where
   homGroup P Q := @Preadditive.homGroup C _ _ (F P) (F Q)
-  add_comp  _ _ _ _ _ _ := add_comp _ _ _ _ _ _
-  comp_add  _ _ _ _ _ _ := comp_add _ _ _ _ _ _
+  add_comp _ _ _ _ _ _ := add_comp _ _ _ _ _ _
+  comp_add _ _ _ _ _ _ := comp_add _ _ _ _ _ _
 #align category_theory.preadditive.induced_category CategoryTheory.Preadditive.inducedCategory
 
 end InducedCategory

829895f1

feat: port Algebra.Category.Group.Preadditive (#3144)

d8d0c899

Diff

@@ -63,9 +63,9 @@ variable (C : Type u) [Category.{v} C]
 class Preadditive where
   homGroup : ∀ P Q : C, AddCommGroup (P ⟶ Q) := by infer_instance
   add_comp : ∀ (P Q R : C) (f f' : P ⟶ Q) (g : Q ⟶ R), (f + f') ≫ g = f ≫ g + f' ≫ g := by
-    aesop
+    aesop_cat
   comp_add : ∀ (P Q R : C) (f : P ⟶ Q) (g g' : Q ⟶ R), f ≫ (g + g') = f ≫ g + f ≫ g' := by
-    aesop
+    aesop_cat
 #align category_theory.preadditive CategoryTheory.Preadditive
 #align category_theory.preadditive.add_comp' CategoryTheory.Preadditive.add_comp
 #align category_theory.preadditive.comp_add' CategoryTheory.Preadditive.comp_add

829895f1

chore: strip trailing spaces in lean files (#2828)

vscode is already configured by .vscode/settings.json to trim these on save. It's not clear how they've managed to stick around.

By doing this all in one PR now, it avoids getting random whitespace diffs in PRs later.

This was done with a regex search in vscode,

6ceb5945

Diff

@@ -74,7 +74,7 @@ attribute [inherit_doc Preadditive] Preadditive.homGroup Preadditive.add_comp Pr
 
 attribute [instance] Preadditive.homGroup
 
--- Porting note: simp can prove reassoc version 
+-- Porting note: simp can prove reassoc version
 attribute [reassoc, simp] Preadditive.add_comp
 
 attribute [reassoc] Preadditive.comp_add
@@ -206,19 +206,19 @@ instance (priority := 100) preadditiveHasZeroMorphisms : HasZeroMorphisms C wher
   zero_comp P _ _ f := show rightComp P f 0 = 0 from map_zero _
 #align category_theory.preadditive.preadditive_has_zero_morphisms CategoryTheory.Preadditive.preadditiveHasZeroMorphisms
 
-/--Porting note: adding this before the ring instance allowed moduleEndRight to find 
-the correct Monoid structure on End. Moved both down after preadditiveHasZeroMorphisms 
+/--Porting note: adding this before the ring instance allowed moduleEndRight to find
+the correct Monoid structure on End. Moved both down after preadditiveHasZeroMorphisms
 to make use of them -/
-instance {X : C} : Semiring (End X) := 
-  { End.monoid with 
-    zero_mul := fun f => by dsimp [mul]; exact HasZeroMorphisms.comp_zero f _ 
+instance {X : C} : Semiring (End X) :=
+  { End.monoid with
+    zero_mul := fun f => by dsimp [mul]; exact HasZeroMorphisms.comp_zero f _
     mul_zero := fun f => by dsimp [mul]; exact HasZeroMorphisms.zero_comp _ f
     left_distrib := fun f g h => Preadditive.add_comp X X X g h f
     right_distrib := fun f g h => Preadditive.comp_add X X X h f g }
 
-/-- Porting note: It looks like Ring's parent classes changed in 
+/-- Porting note: It looks like Ring's parent classes changed in
 Lean 4 so the previous instance needed modification. Was following my nose here. -/
-instance {X : C} : Ring (End X) := 
+instance {X : C} : Ring (End X) :=
   { (inferInstance : Semiring (End X)),
     (inferInstance : AddCommGroup (End X)) with
     add_left_neg := add_left_neg }
@@ -231,7 +231,7 @@ instance moduleEndRight {X Y : C} : Module (End Y) (X ⟶ Y) where
 #align category_theory.preadditive.module_End_right CategoryTheory.Preadditive.moduleEndRight
 
 theorem mono_of_cancel_zero {Q R : C} (f : Q ⟶ R) (h : ∀ {P : C} (g : P ⟶ Q), g ≫ f = 0 → g = 0) :
-    Mono f where 
+    Mono f where
   right_cancellation := fun {Z} g₁ g₂ hg =>
     sub_eq_zero.1 <| h _ <| (map_sub (rightComp Z f) g₁ g₂).trans <| sub_eq_zero.2 hg
 #align category_theory.preadditive.mono_of_cancel_zero CategoryTheory.Preadditive.mono_of_cancel_zero
@@ -248,7 +248,7 @@ theorem mono_of_kernel_zero {X Y : C} {f : X ⟶ Y} [HasLimit (parallelPair f 0)
 
 theorem epi_of_cancel_zero {P Q : C} (f : P ⟶ Q) (h : ∀ {R : C} (g : Q ⟶ R), f ≫ g = 0 → g = 0) :
     Epi f :=
-  ⟨fun {Z} g g' hg => 
+  ⟨fun {Z} g g' hg =>
     sub_eq_zero.1 <| h _ <| (map_sub (leftComp Z f) g g').trans <| sub_eq_zero.2 hg⟩
 #align category_theory.preadditive.epi_of_cancel_zero CategoryTheory.Preadditive.epi_of_cancel_zero
 
@@ -440,7 +440,7 @@ theorem hasEqualizers_of_hasKernels [HasKernels C] : HasEqualizers C :=
 
 /-- If a preadditive category has all cokernels, then it also has all coequalizers. -/
 theorem hasCoequalizers_of_hasCokernels [HasCokernels C] : HasCoequalizers C :=
-  @hasCoequalizers_of_hasColimit_parallelPair _ _ fun {_} {_} f g => 
+  @hasCoequalizers_of_hasColimit_parallelPair _ _ fun {_} {_} f g =>
     hasCoequalizer_of_hasCokernel f g
 #align category_theory.preadditive.has_coequalizers_of_has_cokernels CategoryTheory.Preadditive.hasCoequalizers_of_hasCokernels
 
@@ -449,4 +449,3 @@ end Equalizers
 end Preadditive
 
 end CategoryTheory
-

829895f1

feat: port CategoryTheory.Preadditive.Basic (#2735)

Co-authored-by: Matthew Robert Ballard <100034030+mattrobball@users.noreply.github.com>

2402232c

`category_theory.preadditive.basic` ⟷ `Mathlib.CategoryTheory.Preadditive.Basic`

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 3 + 272

category_theory.preadditive.basic ⟷ Mathlib.CategoryTheory.Preadditive.Basic

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 3 + 272

`category_theory.preadditive.basic` ⟷ `Mathlib.CategoryTheory.Preadditive.Basic`