ring_theory.ring_hom.surjective | 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

831c4940

(last sync)

Changes in mathlib3port

mathlib3

mathlib3port

cff8231f

bump to nightly-2024-03-17-08

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

22f01ce4

Diff

@@ -78,11 +78,11 @@ theorem surjective_ofLocalizationSpan : OfLocalizationSpan surjective :=
   · intro r
     obtain ⟨y, hy⟩ := H r (IsLocalization.mk' _ x (1 : Submonoid.powers (f r)))
     obtain ⟨z, ⟨_, n, rfl⟩, rfl⟩ := IsLocalization.mk'_surjective (Submonoid.powers (r : R)) y
-    erw [IsLocalization.map_mk', IsLocalization.eq] at hy 
+    erw [IsLocalization.map_mk', IsLocalization.eq] at hy
     obtain ⟨⟨_, m, rfl⟩, hm⟩ := hy
     refine' ⟨m + n, _⟩
     dsimp at hm ⊢
-    simp_rw [_root_.one_mul, ← _root_.mul_assoc, ← map_pow, ← f.map_mul, ← pow_add, map_pow] at hm 
+    simp_rw [_root_.one_mul, ← _root_.mul_assoc, ← map_pow, ← f.map_mul, ← pow_add, map_pow] at hm
     exact ⟨_, hm⟩
 #align ring_hom.surjective_of_localization_span RingHom.surjective_ofLocalizationSpan
 -/

cff8231f

bump to nightly-2024-02-01-06

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

5433bded

Diff

@@ -46,6 +46,13 @@ theorem surjective_stableUnderBaseChange : StableUnderBaseChange surjective :=
   by
   refine' stable_under_base_change.mk _ surjective_respects_iso _
   classical
+  introv h x
+  skip
+  induction' x using TensorProduct.induction_on with x y x y ex ey
+  · exact ⟨0, map_zero _⟩
+  · obtain ⟨y, rfl⟩ := h y; use y • x; dsimp
+    rw [TensorProduct.smul_tmul, Algebra.algebraMap_eq_smul_one]
+  · obtain ⟨⟨x, rfl⟩, ⟨y, rfl⟩⟩ := ex, ey; exact ⟨x + y, map_add _ x y⟩
 #align ring_hom.surjective_stable_under_base_change RingHom.surjective_stableUnderBaseChange
 -/

cff8231f

bump to nightly-2024-01-31-06

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

61100fe9

Diff

@@ -46,13 +46,6 @@ theorem surjective_stableUnderBaseChange : StableUnderBaseChange surjective :=
   by
   refine' stable_under_base_change.mk _ surjective_respects_iso _
   classical
-  introv h x
-  skip
-  induction' x using TensorProduct.induction_on with x y x y ex ey
-  · exact ⟨0, map_zero _⟩
-  · obtain ⟨y, rfl⟩ := h y; use y • x; dsimp
-    rw [TensorProduct.smul_tmul, Algebra.algebraMap_eq_smul_one]
-  · obtain ⟨⟨x, rfl⟩, ⟨y, rfl⟩⟩ := ex, ey; exact ⟨x + y, map_add _ x y⟩
 #align ring_hom.surjective_stable_under_base_change RingHom.surjective_stableUnderBaseChange
 -/

cff8231f

bump to nightly-2023-09-24-06

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

5655435f

Diff

@@ -3,7 +3,7 @@ Copyright (c) 2022 Andrew Yang. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Andrew Yang
 -/
-import Mathbin.RingTheory.LocalProperties
+import RingTheory.LocalProperties
 
 #align_import ring_theory.ring_hom.surjective from "leanprover-community/mathlib"@"cff8231f04dfa33fd8f2f45792eebd862ef30cad"

cff8231f

bump to nightly-2023-07-20-09

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

9c56d0dd

Diff

@@ -2,14 +2,11 @@
 Copyright (c) 2022 Andrew Yang. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Andrew Yang
-
-! This file was ported from Lean 3 source module ring_theory.ring_hom.surjective
-! leanprover-community/mathlib commit cff8231f04dfa33fd8f2f45792eebd862ef30cad
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathbin.RingTheory.LocalProperties
 
+#align_import ring_theory.ring_hom.surjective from "leanprover-community/mathlib"@"cff8231f04dfa33fd8f2f45792eebd862ef30cad"
+
 /-!
 
 # The meta properties of surjective ring homomorphisms.

cff8231f

bump to nightly-2023-06-18-23

mathlib commit https://github.com/leanprover-community/mathlib/commit/2a0ce625dbb0ffbc7d1316597de0b25c1ec75303

3b5e23dc

Diff

@@ -29,17 +29,22 @@ open TensorProduct Algebra.TensorProduct
 local notation "surjective" => fun {X Y : Type _} [CommRing X] [CommRing Y] => fun f : X →+* Y =>
   Function.Surjective f
 
+#print RingHom.surjective_stableUnderComposition /-
 theorem surjective_stableUnderComposition : StableUnderComposition surjective := by introv R hf hg;
   exact hg.comp hf
 #align ring_hom.surjective_stable_under_composition RingHom.surjective_stableUnderComposition
+-/
 
+#print RingHom.surjective_respectsIso /-
 theorem surjective_respectsIso : RespectsIso surjective :=
   by
   apply surjective_stable_under_composition.respects_iso
   intros
   exact e.surjective
 #align ring_hom.surjective_respects_iso RingHom.surjective_respectsIso
+-/
 
+#print RingHom.surjective_stableUnderBaseChange /-
 theorem surjective_stableUnderBaseChange : StableUnderBaseChange surjective :=
   by
   refine' stable_under_base_change.mk _ surjective_respects_iso _
@@ -52,9 +57,11 @@ theorem surjective_stableUnderBaseChange : StableUnderBaseChange surjective :=
     rw [TensorProduct.smul_tmul, Algebra.algebraMap_eq_smul_one]
   · obtain ⟨⟨x, rfl⟩, ⟨y, rfl⟩⟩ := ex, ey; exact ⟨x + y, map_add _ x y⟩
 #align ring_hom.surjective_stable_under_base_change RingHom.surjective_stableUnderBaseChange
+-/
 
 open scoped BigOperators
 
+#print RingHom.surjective_ofLocalizationSpan /-
 theorem surjective_ofLocalizationSpan : OfLocalizationSpan surjective :=
   by
   introv R hs H
@@ -81,6 +88,7 @@ theorem surjective_ofLocalizationSpan : OfLocalizationSpan surjective :=
     simp_rw [_root_.one_mul, ← _root_.mul_assoc, ← map_pow, ← f.map_mul, ← pow_add, map_pow] at hm 
     exact ⟨_, hm⟩
 #align ring_hom.surjective_of_localization_span RingHom.surjective_ofLocalizationSpan
+-/
 
 end RingHom

cff8231f

bump to nightly-2023-06-17-03

mathlib commit https://github.com/leanprover-community/mathlib/commit/893964fc28cefbcffc7cb784ed00a2895b4e65cf

253178d1

Diff

@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Andrew Yang
 
 ! This file was ported from Lean 3 source module ring_theory.ring_hom.surjective
-! leanprover-community/mathlib commit 831c494092374cfe9f50591ed0ac81a25efc5b86
+! leanprover-community/mathlib commit cff8231f04dfa33fd8f2f45792eebd862ef30cad
 ! Please do not edit these lines, except to modify the commit id
 ! if you have ported upstream changes.
 -/
@@ -14,6 +14,9 @@ import Mathbin.RingTheory.LocalProperties
 
 # The meta properties of surjective ring homomorphisms.
 
+> THIS FILE IS SYNCHRONIZED WITH MATHLIB4.
+> Any changes to this file require a corresponding PR to mathlib4.
+
 -/

831c4940

bump to nightly-2023-06-13-21

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

829520ac

Diff

@@ -23,7 +23,6 @@ open scoped TensorProduct
 
 open TensorProduct Algebra.TensorProduct
 
--- mathport name: exprsurjective
 local notation "surjective" => fun {X Y : Type _} [CommRing X] [CommRing Y] => fun f : X →+* Y =>
   Function.Surjective f

831c4940

bump to nightly-2023-06-04-18

mathlib commit https://github.com/leanprover-community/mathlib/commit/5f25c089cb34db4db112556f23c50d12da81b297

3fb4268b

Diff

@@ -42,13 +42,13 @@ theorem surjective_stableUnderBaseChange : StableUnderBaseChange surjective :=
   by
   refine' stable_under_base_change.mk _ surjective_respects_iso _
   classical
-    introv h x
-    skip
-    induction' x using TensorProduct.induction_on with x y x y ex ey
-    · exact ⟨0, map_zero _⟩
-    · obtain ⟨y, rfl⟩ := h y; use y • x; dsimp
-      rw [TensorProduct.smul_tmul, Algebra.algebraMap_eq_smul_one]
-    · obtain ⟨⟨x, rfl⟩, ⟨y, rfl⟩⟩ := ex, ey; exact ⟨x + y, map_add _ x y⟩
+  introv h x
+  skip
+  induction' x using TensorProduct.induction_on with x y x y ex ey
+  · exact ⟨0, map_zero _⟩
+  · obtain ⟨y, rfl⟩ := h y; use y • x; dsimp
+    rw [TensorProduct.smul_tmul, Algebra.algebraMap_eq_smul_one]
+  · obtain ⟨⟨x, rfl⟩, ⟨y, rfl⟩⟩ := ex, ey; exact ⟨x + y, map_add _ x y⟩
 #align ring_hom.surjective_stable_under_base_change RingHom.surjective_stableUnderBaseChange
 
 open scoped BigOperators

831c4940

bump to nightly-2023-06-01-16

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

b9c87c70

Diff

@@ -72,11 +72,11 @@ theorem surjective_ofLocalizationSpan : OfLocalizationSpan surjective :=
   · intro r
     obtain ⟨y, hy⟩ := H r (IsLocalization.mk' _ x (1 : Submonoid.powers (f r)))
     obtain ⟨z, ⟨_, n, rfl⟩, rfl⟩ := IsLocalization.mk'_surjective (Submonoid.powers (r : R)) y
-    erw [IsLocalization.map_mk', IsLocalization.eq] at hy
+    erw [IsLocalization.map_mk', IsLocalization.eq] at hy 
     obtain ⟨⟨_, m, rfl⟩, hm⟩ := hy
     refine' ⟨m + n, _⟩
-    dsimp at hm⊢
-    simp_rw [_root_.one_mul, ← _root_.mul_assoc, ← map_pow, ← f.map_mul, ← pow_add, map_pow] at hm
+    dsimp at hm ⊢
+    simp_rw [_root_.one_mul, ← _root_.mul_assoc, ← map_pow, ← f.map_mul, ← pow_add, map_pow] at hm 
     exact ⟨_, hm⟩
 #align ring_hom.surjective_of_localization_span RingHom.surjective_ofLocalizationSpan

831c4940

bump to nightly-2023-05-28-18

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

8d353152

Diff

@@ -19,7 +19,7 @@ import Mathbin.RingTheory.LocalProperties
 
 namespace RingHom
 
-open TensorProduct
+open scoped TensorProduct
 
 open TensorProduct Algebra.TensorProduct
 
@@ -51,7 +51,7 @@ theorem surjective_stableUnderBaseChange : StableUnderBaseChange surjective :=
     · obtain ⟨⟨x, rfl⟩, ⟨y, rfl⟩⟩ := ex, ey; exact ⟨x + y, map_add _ x y⟩
 #align ring_hom.surjective_stable_under_base_change RingHom.surjective_stableUnderBaseChange
 
-open BigOperators
+open scoped BigOperators
 
 theorem surjective_ofLocalizationSpan : OfLocalizationSpan surjective :=
   by

831c4940

bump to nightly-2023-05-28-04

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

6797a637

Diff

@@ -27,9 +27,7 @@ open TensorProduct Algebra.TensorProduct
 local notation "surjective" => fun {X Y : Type _} [CommRing X] [CommRing Y] => fun f : X →+* Y =>
   Function.Surjective f
 
-theorem surjective_stableUnderComposition : StableUnderComposition surjective :=
-  by
-  introv R hf hg
+theorem surjective_stableUnderComposition : StableUnderComposition surjective := by introv R hf hg;
   exact hg.comp hf
 #align ring_hom.surjective_stable_under_composition RingHom.surjective_stableUnderComposition
 
@@ -48,12 +46,9 @@ theorem surjective_stableUnderBaseChange : StableUnderBaseChange surjective :=
     skip
     induction' x using TensorProduct.induction_on with x y x y ex ey
     · exact ⟨0, map_zero _⟩
-    · obtain ⟨y, rfl⟩ := h y
-      use y • x
-      dsimp
+    · obtain ⟨y, rfl⟩ := h y; use y • x; dsimp
       rw [TensorProduct.smul_tmul, Algebra.algebraMap_eq_smul_one]
-    · obtain ⟨⟨x, rfl⟩, ⟨y, rfl⟩⟩ := ex, ey
-      exact ⟨x + y, map_add _ x y⟩
+    · obtain ⟨⟨x, rfl⟩, ⟨y, rfl⟩⟩ := ex, ey; exact ⟨x + y, map_add _ x y⟩
 #align ring_hom.surjective_stable_under_base_change RingHom.surjective_stableUnderBaseChange
 
 open BigOperators
@@ -67,16 +62,11 @@ theorem surjective_ofLocalizationSpan : OfLocalizationSpan surjective :=
   rw [← Algebra.range_top_iff_surjective, eq_top_iff]
   rintro x -
   obtain ⟨l, hl⟩ :=
-    (Finsupp.mem_span_iff_total R s 1).mp
-      (show _ ∈ Ideal.span s by
-        rw [hs]
-        trivial)
+    (Finsupp.mem_span_iff_total R s 1).mp (show _ ∈ Ideal.span s by rw [hs]; trivial)
   fapply
     Subalgebra.mem_of_finset_sum_eq_one_of_pow_smul_mem _ l.support (fun x : s => f x) fun x : s =>
       f (l x)
-  · dsimp only
-    simp_rw [← _root_.map_mul, ← map_sum, ← f.map_one]
-    exact f.congr_arg hl
+  · dsimp only; simp_rw [← _root_.map_mul, ← map_sum, ← f.map_one]; exact f.congr_arg hl
   · exact fun _ => Set.mem_range_self _
   · exact fun _ => Set.mem_range_self _
   · intro r

831c4940

bump to nightly-2023-02-21-16

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

1107b979

Changes in mathlib4

mathlib3

mathlib4

831c4940

chore: remove tactics (#11365)

More tactics that are not used, found using the linter at #11308.

The PR consists of tactic removals, whitespace changes and replacing a porting note by an explanation.

c33c2724

Diff

@@ -37,7 +37,6 @@ theorem surjective_stableUnderBaseChange : StableUnderBaseChange surjective := b
   refine' StableUnderBaseChange.mk _ surjective_respectsIso _
   classical
   introv h x
-  skip
   induction x using TensorProduct.induction_on with
   | zero => exact ⟨0, map_zero _⟩
   | tmul x y =>
@@ -50,7 +49,6 @@ open scoped BigOperators
 
 theorem surjective_ofLocalizationSpan : OfLocalizationSpan surjective := by
   introv R hs H
-  skip
   letI := f.toAlgebra
   show Function.Surjective (Algebra.ofId R S)
   rw [← Algebra.range_top_iff_surjective, eq_top_iff]

831c4940

perf(FunLike.Basic): beta reduce CoeFun.coe (#7905)

This eliminates (fun a ↦ β) α in the type when applying a FunLike.

Co-authored-by: Matthew Ballard <matt@mrb.email> Co-authored-by: Eric Wieser <wieser.eric@gmail.com>

e194c756

Diff

@@ -60,7 +60,7 @@ theorem surjective_ofLocalizationSpan : OfLocalizationSpan surjective := by
   fapply
     Subalgebra.mem_of_finset_sum_eq_one_of_pow_smul_mem _ l.support (fun x : s => f x) fun x : s =>
       f (l x)
-  · dsimp only; simp_rw [← _root_.map_mul, ← map_sum, ← f.map_one]; exact f.congr_arg hl
+  · simp_rw [← _root_.map_mul, ← map_sum, ← f.map_one]; exact f.congr_arg hl
   · exact fun _ => Set.mem_range_self _
   · exact fun _ => Set.mem_range_self _
   · intro r

831c4940

chore(LinearAlgebra/TensorProduct): better names for induction hypotheses (#6451)

This also makes some proofs more verbose to make it clearer which goal is which.

40bc9866

Diff

@@ -38,11 +38,12 @@ theorem surjective_stableUnderBaseChange : StableUnderBaseChange surjective := b
   classical
   introv h x
   skip
-  induction' x using TensorProduct.induction_on with x y x y ex ey
-  · exact ⟨0, map_zero _⟩
-  · obtain ⟨y, rfl⟩ := h y; use y • x; dsimp
+  induction x using TensorProduct.induction_on with
+  | zero => exact ⟨0, map_zero _⟩
+  | tmul x y =>
+    obtain ⟨y, rfl⟩ := h y; use y • x; dsimp
     rw [TensorProduct.smul_tmul, Algebra.algebraMap_eq_smul_one]
-  · obtain ⟨⟨x, rfl⟩, ⟨y, rfl⟩⟩ := ex, ey; exact ⟨x + y, map_add _ x y⟩
+  | add x y ex ey => obtain ⟨⟨x, rfl⟩, ⟨y, rfl⟩⟩ := ex, ey; exact ⟨x + y, map_add _ x y⟩
 #align ring_hom.surjective_stable_under_base_change RingHom.surjective_stableUnderBaseChange
 
 open scoped BigOperators

831c4940

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

@@ -2,14 +2,11 @@
 Copyright (c) 2022 Andrew Yang. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Andrew Yang
-
-! This file was ported from Lean 3 source module ring_theory.ring_hom.surjective
-! leanprover-community/mathlib commit 831c494092374cfe9f50591ed0ac81a25efc5b86
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathlib.RingTheory.LocalProperties
 
+#align_import ring_theory.ring_hom.surjective from "leanprover-community/mathlib"@"831c494092374cfe9f50591ed0ac81a25efc5b86"
+
 /-!
 
 # The meta properties of surjective ring homomorphisms.

831c4940

feat: port RingTheory.RingHom.Surjective (#5066)

29838acc

`ring_theory.ring_hom.surjective` ⟷ `Mathlib.RingTheory.RingHom.Surjective`

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 10 + 686

ring_theory.ring_hom.surjective ⟷ Mathlib.RingTheory.RingHom.Surjective

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 10 + 686

`ring_theory.ring_hom.surjective` ⟷ `Mathlib.RingTheory.RingHom.Surjective`