category_theory.epi_mono | 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

48085f14

(last sync)

Changes in mathlib3port

mathlib3

mathlib3port

e97cf15c

bump to nightly-2023-09-24-06

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

5655435f

Diff

@@ -3,8 +3,8 @@ Copyright (c) 2019 Reid Barton. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Reid Barton, Scott Morrison
 -/
-import Mathbin.CategoryTheory.Opposites
-import Mathbin.CategoryTheory.Groupoid
+import CategoryTheory.Opposites
+import CategoryTheory.Groupoid
 
 #align_import category_theory.epi_mono from "leanprover-community/mathlib"@"e97cf15cd1aec9bd5c193b2ffac5a6dc9118912b"

e97cf15c

bump to nightly-2023-09-06-06

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

f3106448

Diff

@@ -62,8 +62,6 @@ structure SplitMono {X Y : C} (f : X ⟶ Y) where
 #align category_theory.split_mono CategoryTheory.SplitMono
 -/
 
-restate_axiom split_mono.id'
-
 attribute [simp, reassoc] split_mono.id
 
 #print CategoryTheory.IsSplitMono /-
@@ -94,8 +92,6 @@ structure SplitEpi {X Y : C} (f : X ⟶ Y) where
 #align category_theory.split_epi CategoryTheory.SplitEpi
 -/
 
-restate_axiom split_epi.id'
-
 attribute [simp, reassoc] split_epi.id
 
 #print CategoryTheory.IsSplitEpi /-

e97cf15c

bump to nightly-2023-07-20-09

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

9c56d0dd

Diff

@@ -2,15 +2,12 @@
 Copyright (c) 2019 Reid Barton. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Reid Barton, Scott Morrison
-
-! This file was ported from Lean 3 source module category_theory.epi_mono
-! leanprover-community/mathlib commit e97cf15cd1aec9bd5c193b2ffac5a6dc9118912b
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathbin.CategoryTheory.Opposites
 import Mathbin.CategoryTheory.Groupoid
 
+#align_import category_theory.epi_mono from "leanprover-community/mathlib"@"e97cf15cd1aec9bd5c193b2ffac5a6dc9118912b"
+
 /-!
 # Facts about epimorphisms and monomorphisms.

e97cf15c

bump to nightly-2023-06-13-21

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

829520ac

Diff

@@ -314,6 +314,7 @@ section
 
 variable {D : Type u₂} [Category.{v₂} D]
 
+#print CategoryTheory.SplitMono.map /-
 /-- Split monomorphisms are also absolute monomorphisms. -/
 @[simps]
 def SplitMono.map {X Y : C} {f : X ⟶ Y} (sm : SplitMono f) (F : C ⥤ D) : SplitMono (F.map f)
@@ -321,7 +322,9 @@ def SplitMono.map {X Y : C} {f : X ⟶ Y} (sm : SplitMono f) (F : C ⥤ D) : Spl
   retraction := F.map sm.retraction
   id' := by rw [← functor.map_comp, split_mono.id, Functor.map_id]
 #align category_theory.split_mono.map CategoryTheory.SplitMono.map
+-/
 
+#print CategoryTheory.SplitEpi.map /-
 /-- Split epimorphisms are also absolute epimorphisms. -/
 @[simps]
 def SplitEpi.map {X Y : C} {f : X ⟶ Y} (se : SplitEpi f) (F : C ⥤ D) : SplitEpi (F.map f)
@@ -329,6 +332,7 @@ def SplitEpi.map {X Y : C} {f : X ⟶ Y} (se : SplitEpi f) (F : C ⥤ D) : Split
   section_ := F.map se.section_
   id' := by rw [← functor.map_comp, split_epi.id, Functor.map_id]
 #align category_theory.split_epi.map CategoryTheory.SplitEpi.map
+-/
 
 instance {X Y : C} (f : X ⟶ Y) [hf : IsSplitMono f] (F : C ⥤ D) : IsSplitMono (F.map f) :=
   IsSplitMono.mk' (hf.exists_splitMono.some.map F)

e97cf15c

bump to nightly-2023-05-28-06

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

ba5d8b97

Diff

@@ -314,12 +314,6 @@ section
 
 variable {D : Type u₂} [Category.{v₂} D]
 
-/- warning: category_theory.split_mono.map -> CategoryTheory.SplitMono.map is a dubious translation:
-lean 3 declaration is
-  forall {C : Type.{u3}} [_inst_1 : CategoryTheory.Category.{u1, u3} C] {D : Type.{u4}} [_inst_2 : CategoryTheory.Category.{u2, u4} D] {X : C} {Y : C} {f : Quiver.Hom.{succ u1, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u3} C (CategoryTheory.Category.toCategoryStruct.{u1, u3} C _inst_1)) X Y}, (CategoryTheory.SplitMono.{u1, u3} C _inst_1 X Y f) -> (forall (F : CategoryTheory.Functor.{u1, u2, u3, u4} C _inst_1 D _inst_2), CategoryTheory.SplitMono.{u2, u4} D _inst_2 (CategoryTheory.Functor.obj.{u1, u2, u3, u4} C _inst_1 D _inst_2 F X) (CategoryTheory.Functor.obj.{u1, u2, u3, u4} C _inst_1 D _inst_2 F Y) (CategoryTheory.Functor.map.{u1, u2, u3, u4} C _inst_1 D _inst_2 F X Y f))
-but is expected to have type
-  forall {C : Type.{u3}} [_inst_1 : CategoryTheory.Category.{u1, u3} C] {D : Type.{u4}} [_inst_2 : CategoryTheory.Category.{u2, u4} D] {X : C} {Y : C} {f : Quiver.Hom.{succ u1, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u3} C (CategoryTheory.Category.toCategoryStruct.{u1, u3} C _inst_1)) X Y}, (CategoryTheory.SplitMono.{u1, u3} C _inst_1 X Y f) -> (forall (F : CategoryTheory.Functor.{u1, u2, u3, u4} C _inst_1 D _inst_2), CategoryTheory.SplitMono.{u2, u4} D _inst_2 (Prefunctor.obj.{succ u1, succ u2, u3, u4} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u3} C (CategoryTheory.Category.toCategoryStruct.{u1, u3} C _inst_1)) D (CategoryTheory.CategoryStruct.toQuiver.{u2, u4} D (CategoryTheory.Category.toCategoryStruct.{u2, u4} D _inst_2)) (CategoryTheory.Functor.toPrefunctor.{u1, u2, u3, u4} C _inst_1 D _inst_2 F) X) (Prefunctor.obj.{succ u1, succ u2, u3, u4} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u3} C (CategoryTheory.Category.toCategoryStruct.{u1, u3} C _inst_1)) D (CategoryTheory.CategoryStruct.toQuiver.{u2, u4} D (CategoryTheory.Category.toCategoryStruct.{u2, u4} D _inst_2)) (CategoryTheory.Functor.toPrefunctor.{u1, u2, u3, u4} C _inst_1 D _inst_2 F) Y) (Prefunctor.map.{succ u1, succ u2, u3, u4} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u3} C (CategoryTheory.Category.toCategoryStruct.{u1, u3} C _inst_1)) D (CategoryTheory.CategoryStruct.toQuiver.{u2, u4} D (CategoryTheory.Category.toCategoryStruct.{u2, u4} D _inst_2)) (CategoryTheory.Functor.toPrefunctor.{u1, u2, u3, u4} C _inst_1 D _inst_2 F) X Y f))
-Case conversion may be inaccurate. Consider using '#align category_theory.split_mono.map CategoryTheory.SplitMono.mapₓ'. -/
 /-- Split monomorphisms are also absolute monomorphisms. -/
 @[simps]
 def SplitMono.map {X Y : C} {f : X ⟶ Y} (sm : SplitMono f) (F : C ⥤ D) : SplitMono (F.map f)
@@ -328,12 +322,6 @@ def SplitMono.map {X Y : C} {f : X ⟶ Y} (sm : SplitMono f) (F : C ⥤ D) : Spl
   id' := by rw [← functor.map_comp, split_mono.id, Functor.map_id]
 #align category_theory.split_mono.map CategoryTheory.SplitMono.map
 
-/- warning: category_theory.split_epi.map -> CategoryTheory.SplitEpi.map is a dubious translation:
-lean 3 declaration is
-  forall {C : Type.{u3}} [_inst_1 : CategoryTheory.Category.{u1, u3} C] {D : Type.{u4}} [_inst_2 : CategoryTheory.Category.{u2, u4} D] {X : C} {Y : C} {f : Quiver.Hom.{succ u1, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u3} C (CategoryTheory.Category.toCategoryStruct.{u1, u3} C _inst_1)) X Y}, (CategoryTheory.SplitEpi.{u1, u3} C _inst_1 X Y f) -> (forall (F : CategoryTheory.Functor.{u1, u2, u3, u4} C _inst_1 D _inst_2), CategoryTheory.SplitEpi.{u2, u4} D _inst_2 (CategoryTheory.Functor.obj.{u1, u2, u3, u4} C _inst_1 D _inst_2 F X) (CategoryTheory.Functor.obj.{u1, u2, u3, u4} C _inst_1 D _inst_2 F Y) (CategoryTheory.Functor.map.{u1, u2, u3, u4} C _inst_1 D _inst_2 F X Y f))
-but is expected to have type
-  forall {C : Type.{u3}} [_inst_1 : CategoryTheory.Category.{u1, u3} C] {D : Type.{u4}} [_inst_2 : CategoryTheory.Category.{u2, u4} D] {X : C} {Y : C} {f : Quiver.Hom.{succ u1, u3} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u3} C (CategoryTheory.Category.toCategoryStruct.{u1, u3} C _inst_1)) X Y}, (CategoryTheory.SplitEpi.{u1, u3} C _inst_1 X Y f) -> (forall (F : CategoryTheory.Functor.{u1, u2, u3, u4} C _inst_1 D _inst_2), CategoryTheory.SplitEpi.{u2, u4} D _inst_2 (Prefunctor.obj.{succ u1, succ u2, u3, u4} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u3} C (CategoryTheory.Category.toCategoryStruct.{u1, u3} C _inst_1)) D (CategoryTheory.CategoryStruct.toQuiver.{u2, u4} D (CategoryTheory.Category.toCategoryStruct.{u2, u4} D _inst_2)) (CategoryTheory.Functor.toPrefunctor.{u1, u2, u3, u4} C _inst_1 D _inst_2 F) X) (Prefunctor.obj.{succ u1, succ u2, u3, u4} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u3} C (CategoryTheory.Category.toCategoryStruct.{u1, u3} C _inst_1)) D (CategoryTheory.CategoryStruct.toQuiver.{u2, u4} D (CategoryTheory.Category.toCategoryStruct.{u2, u4} D _inst_2)) (CategoryTheory.Functor.toPrefunctor.{u1, u2, u3, u4} C _inst_1 D _inst_2 F) Y) (Prefunctor.map.{succ u1, succ u2, u3, u4} C (CategoryTheory.CategoryStruct.toQuiver.{u1, u3} C (CategoryTheory.Category.toCategoryStruct.{u1, u3} C _inst_1)) D (CategoryTheory.CategoryStruct.toQuiver.{u2, u4} D (CategoryTheory.Category.toCategoryStruct.{u2, u4} D _inst_2)) (CategoryTheory.Functor.toPrefunctor.{u1, u2, u3, u4} C _inst_1 D _inst_2 F) X Y f))
-Case conversion may be inaccurate. Consider using '#align category_theory.split_epi.map CategoryTheory.SplitEpi.mapₓ'. -/
 /-- Split epimorphisms are also absolute epimorphisms. -/
 @[simps]
 def SplitEpi.map {X Y : C} {f : X ⟶ Y} (se : SplitEpi f) (F : C ⥤ D) : SplitEpi (F.map f)

e97cf15c

bump to nightly-2023-05-23-03

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

ed98987c

Diff

@@ -67,7 +67,7 @@ structure SplitMono {X Y : C} (f : X ⟶ Y) where
 
 restate_axiom split_mono.id'
 
-attribute [simp, reassoc.1] split_mono.id
+attribute [simp, reassoc] split_mono.id
 
 #print CategoryTheory.IsSplitMono /-
 /-- `is_split_mono f` is the assertion that `f` admits a retraction -/
@@ -99,7 +99,7 @@ structure SplitEpi {X Y : C} (f : X ⟶ Y) where
 
 restate_axiom split_epi.id'
 
-attribute [simp, reassoc.1] split_epi.id
+attribute [simp, reassoc] split_epi.id
 
 #print CategoryTheory.IsSplitEpi /-
 /-- `is_split_epi f` is the assertion that `f` admits a section -/
@@ -123,7 +123,7 @@ noncomputable def retraction {X Y : C} (f : X ⟶ Y) [hf : IsSplitMono f] : Y 
 -/
 
 #print CategoryTheory.IsSplitMono.id /-
-@[simp, reassoc.1]
+@[simp, reassoc]
 theorem IsSplitMono.id {X Y : C} (f : X ⟶ Y) [hf : IsSplitMono f] : f ≫ retraction f = 𝟙 X :=
   hf.exists_splitMono.some.id
 #align category_theory.is_split_mono.id CategoryTheory.IsSplitMono.id
@@ -161,7 +161,7 @@ noncomputable def section_ {X Y : C} (f : X ⟶ Y) [hf : IsSplitEpi f] : Y ⟶ X
 -/
 
 #print CategoryTheory.IsSplitEpi.id /-
-@[simp, reassoc.1]
+@[simp, reassoc]
 theorem IsSplitEpi.id {X Y : C} (f : X ⟶ Y) [hf : IsSplitEpi f] : section_ f ≫ f = 𝟙 Y :=
   hf.exists_splitEpi.some.id
 #align category_theory.is_split_epi.id CategoryTheory.IsSplitEpi.id

e97cf15c

bump to nightly-2023-02-21-16

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

1107b979

Changes in mathlib4

mathlib3

mathlib4

48085f14

chore(CategoryTheory): make Functor.Full a Prop (#12449)

Before this PR, Functor.Full contained the data of the preimage of maps by a full functor F. This PR makes Functor.Full a proposition. This is to prevent any diamond to appear.

The lemma Functor.image_preimage is also renamed Functor.map_preimage.

Co-authored-by: Joël Riou <37772949+joelriou@users.noreply.github.com>

ce289a0e

Diff

@@ -45,7 +45,7 @@ Every split monomorphism is a monomorphism.
 -/
 /- Porting note(#5171): removed @[nolint has_nonempty_instance] -/
 /- Porting note: `@[ext]` used to accept lemmas like this. Now we add an aesop rule -/
-@[aesop apply safe (rule_sets := [CategoryTheory])]
+@[ext, aesop apply safe (rule_sets := [CategoryTheory])]
 structure SplitMono {X Y : C} (f : X ⟶ Y) where
   /-- The map splitting `f` -/
   retraction : Y ⟶ X
@@ -75,7 +75,7 @@ Every split epimorphism is an epimorphism.
 -/
 /- Porting note(#5171): removed @[nolint has_nonempty_instance] -/
 /- Porting note: `@[ext]` used to accept lemmas like this. Now we add an aesop rule -/
-@[aesop apply safe (rule_sets := [CategoryTheory])]
+@[ext, aesop apply safe (rule_sets := [CategoryTheory])]
 structure SplitEpi {X Y : C} (f : X ⟶ Y) where
   /-- The map splitting `f` -/
   section_ : Y ⟶ X

48085f14

chore: classify porting notes referring to missing linters (#12098)

Reference the newly created issues #12094 and #12096, as well as the pre-existing #5171. Change all references to #10927 to #5171. Some of these changes were not labelled as "porting note"; change this for good measure.

c5b5490c

Diff

@@ -43,7 +43,7 @@ such that `f ≫ retraction f = 𝟙 X`.
 
 Every split monomorphism is a monomorphism.
 -/
-/- Porting note: @[nolint has_nonempty_instance] -/
+/- Porting note(#5171): removed @[nolint has_nonempty_instance] -/
 /- Porting note: `@[ext]` used to accept lemmas like this. Now we add an aesop rule -/
 @[aesop apply safe (rule_sets := [CategoryTheory])]
 structure SplitMono {X Y : C} (f : X ⟶ Y) where
@@ -73,7 +73,7 @@ such that `section_ f ≫ f = 𝟙 Y`.
 
 Every split epimorphism is an epimorphism.
 -/
-/- Porting note: @[nolint has_nonempty_instance] -/
+/- Porting note(#5171): removed @[nolint has_nonempty_instance] -/
 /- Porting note: `@[ext]` used to accept lemmas like this. Now we add an aesop rule -/
 @[aesop apply safe (rule_sets := [CategoryTheory])]
 structure SplitEpi {X Y : C} (f : X ⟶ Y) where

48085f14

chore: bump aesop; update syntax (#10955)

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

46974e92

Diff

@@ -45,7 +45,7 @@ Every split monomorphism is a monomorphism.
 -/
 /- Porting note: @[nolint has_nonempty_instance] -/
 /- Porting note: `@[ext]` used to accept lemmas like this. Now we add an aesop rule -/
-@[aesop apply safe (rule_sets [CategoryTheory])]
+@[aesop apply safe (rule_sets := [CategoryTheory])]
 structure SplitMono {X Y : C} (f : X ⟶ Y) where
   /-- The map splitting `f` -/
   retraction : Y ⟶ X
@@ -75,7 +75,7 @@ Every split epimorphism is an epimorphism.
 -/
 /- Porting note: @[nolint has_nonempty_instance] -/
 /- Porting note: `@[ext]` used to accept lemmas like this. Now we add an aesop rule -/
-@[aesop apply safe (rule_sets [CategoryTheory])]
+@[aesop apply safe (rule_sets := [CategoryTheory])]
 structure SplitEpi {X Y : C} (f : X ⟶ Y) where
   /-- The map splitting `f` -/
   section_ : Y ⟶ X

48085f14

style: fix wrapping of where (#7149)

084cfb35

Diff

@@ -108,8 +108,8 @@ theorem IsSplitMono.id {X Y : C} (f : X ⟶ Y) [hf : IsSplitMono f] : f ≫ retr
 #align category_theory.is_split_mono.id CategoryTheory.IsSplitMono.id
 
 /-- The retraction of a split monomorphism has an obvious section. -/
-def SplitMono.splitEpi {X Y : C} {f : X ⟶ Y} (sm : SplitMono f) : SplitEpi sm.retraction
-    where section_ := f
+def SplitMono.splitEpi {X Y : C} {f : X ⟶ Y} (sm : SplitMono f) : SplitEpi sm.retraction where
+  section_ := f
 #align category_theory.split_mono.split_epi CategoryTheory.SplitMono.splitEpi
 
 /-- The retraction of a split monomorphism is itself a split epimorphism. -/
@@ -136,8 +136,8 @@ theorem IsSplitEpi.id {X Y : C} (f : X ⟶ Y) [hf : IsSplitEpi f] : section_ f 
 #align category_theory.is_split_epi.id CategoryTheory.IsSplitEpi.id
 
 /-- The section of a split epimorphism has an obvious retraction. -/
-def SplitEpi.splitMono {X Y : C} {f : X ⟶ Y} (se : SplitEpi f) : SplitMono se.section_
-    where retraction := f
+def SplitEpi.splitMono {X Y : C} {f : X ⟶ Y} (se : SplitEpi f) : SplitMono se.section_ where
+  retraction := f
 #align category_theory.split_epi.split_mono CategoryTheory.SplitEpi.splitMono
 
 /-- The section of a split epimorphism is itself a split monomorphism. -/

48085f14

feat: Linter that checks that Prop classes are Props (#6148)

930dd29d

Diff

@@ -218,14 +218,14 @@ section
 variable (C)
 
 /-- A split mono category is a category in which every monomorphism is split. -/
-class SplitMonoCategory where
+class SplitMonoCategory : Prop where
   /-- All monos are split -/
   isSplitMono_of_mono : ∀ {X Y : C} (f : X ⟶ Y) [Mono f], IsSplitMono f
 #align category_theory.split_mono_category CategoryTheory.SplitMonoCategory
 #align category_theory.split_mono_category.is_split_mono_of_mono CategoryTheory.SplitMonoCategory.isSplitMono_of_mono
 
 /-- A split epi category is a category in which every epimorphism is split. -/
-class SplitEpiCategory where
+class SplitEpiCategory : Prop where
   /-- All epis are split -/
   isSplitEpi_of_epi : ∀ {X Y : C} (f : X ⟶ Y) [Epi f], IsSplitEpi f
 #align category_theory.split_epi_category CategoryTheory.SplitEpiCategory

48085f14

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

@@ -2,15 +2,12 @@
 Copyright (c) 2019 Reid Barton. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Reid Barton, Scott Morrison
-
-! This file was ported from Lean 3 source module category_theory.epi_mono
-! leanprover-community/mathlib commit 48085f140e684306f9e7da907cd5932056d1aded
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathlib.CategoryTheory.Opposites
 import Mathlib.CategoryTheory.Groupoid
 
+#align_import category_theory.epi_mono from "leanprover-community/mathlib"@"48085f140e684306f9e7da907cd5932056d1aded"
+
 /-!
 # Facts about epimorphisms and monomorphisms.

48085f14

chore: formatting issues (#4947)

Co-authored-by: Scott Morrison <scott.morrison@anu.edu.au> Co-authored-by: Parcly Taxel <reddeloostw@gmail.com>

5068808d

Diff

@@ -211,8 +211,8 @@ noncomputable def Groupoid.ofTruncSplitMono
     (all_split_mono : ∀ {X Y : C} (f : X ⟶ Y), Trunc (IsSplitMono f)) : Groupoid.{v₁} C := by
   apply Groupoid.ofIsIso
   intro X Y f
-  have ⟨a,_⟩:= Trunc.exists_rep <| all_split_mono f
-  have ⟨b,_⟩:= Trunc.exists_rep <| all_split_mono <| retraction f
+  have ⟨a,_⟩ := Trunc.exists_rep <| all_split_mono f
+  have ⟨b,_⟩ := Trunc.exists_rep <| all_split_mono <| retraction f
   apply IsIso.of_mono_retraction
 #align category_theory.groupoid.of_trunc_split_mono CategoryTheory.Groupoid.ofTruncSplitMono

48085f14

chore: fix upper/lowercase in comments (#4360)

Run a non-interactive version of fix-comments.py on all files.
Go through the diff and manually add/discard/edit chunks.

27d257fc

Diff

@@ -206,7 +206,7 @@ theorem IsIso.of_epi_section {X Y : C} (f : X ⟶ Y) [hf : IsSplitEpi f] [hf' :
 #align category_theory.is_iso.of_epi_section CategoryTheory.IsIso.of_epi_section
 
 -- FIXME this has unnecessarily become noncomputable!
-/-- A category where every morphism has a `trunc` retraction is computably a groupoid. -/
+/-- A category where every morphism has a `Trunc` retraction is computably a groupoid. -/
 noncomputable def Groupoid.ofTruncSplitMono
     (all_split_mono : ∀ {X Y : C} (f : X ⟶ Y), Trunc (IsSplitMono f)) : Groupoid.{v₁} C := by
   apply Groupoid.ofIsIso

48085f14

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

@@ -60,7 +60,7 @@ attribute [reassoc (attr := simp)] SplitMono.id
 
 /-- `IsSplitMono f` is the assertion that `f` admits a retraction -/
 class IsSplitMono {X Y : C} (f : X ⟶ Y) : Prop where
-  /-- There is a splitting -/ 
+  /-- There is a splitting -/
   exists_splitMono : Nonempty (SplitMono f)
 #align category_theory.is_split_mono CategoryTheory.IsSplitMono
 #align category_theory.is_split_mono.exists_split_mono CategoryTheory.IsSplitMono.exists_splitMono
@@ -111,7 +111,7 @@ theorem IsSplitMono.id {X Y : C} (f : X ⟶ Y) [hf : IsSplitMono f] : f ≫ retr
 #align category_theory.is_split_mono.id CategoryTheory.IsSplitMono.id
 
 /-- The retraction of a split monomorphism has an obvious section. -/
-def SplitMono.splitEpi {X Y : C} {f : X ⟶ Y} (sm : SplitMono f) : SplitEpi sm.retraction 
+def SplitMono.splitEpi {X Y : C} {f : X ⟶ Y} (sm : SplitMono f) : SplitEpi sm.retraction
     where section_ := f
 #align category_theory.split_mono.split_epi CategoryTheory.SplitMono.splitEpi

48085f14

fix: add missing aligns to category files (#2320)

b556815e

Diff

@@ -63,6 +63,7 @@ class IsSplitMono {X Y : C} (f : X ⟶ Y) : Prop where
   /-- There is a splitting -/ 
   exists_splitMono : Nonempty (SplitMono f)
 #align category_theory.is_split_mono CategoryTheory.IsSplitMono
+#align category_theory.is_split_mono.exists_split_mono CategoryTheory.IsSplitMono.exists_splitMono
 
 /-- A constructor for `IsSplitMono f` taking a `SplitMono f` as an argument -/
 theorem IsSplitMono.mk' {X Y : C} {f : X ⟶ Y} (sm : SplitMono f) : IsSplitMono f :=
@@ -92,6 +93,7 @@ class IsSplitEpi {X Y : C} (f : X ⟶ Y) : Prop where
   /-- There is a splitting -/
   exists_splitEpi : Nonempty (SplitEpi f)
 #align category_theory.is_split_epi CategoryTheory.IsSplitEpi
+#align category_theory.is_split_epi.exists_split_epi CategoryTheory.IsSplitEpi.exists_splitEpi
 
 /-- A constructor for `IsSplitEpi f` taking a `SplitEpi f` as an argument -/
 theorem IsSplitEpi.mk' {X Y : C} {f : X ⟶ Y} (se : SplitEpi f) : IsSplitEpi f :=
@@ -223,12 +225,14 @@ class SplitMonoCategory where
   /-- All monos are split -/
   isSplitMono_of_mono : ∀ {X Y : C} (f : X ⟶ Y) [Mono f], IsSplitMono f
 #align category_theory.split_mono_category CategoryTheory.SplitMonoCategory
+#align category_theory.split_mono_category.is_split_mono_of_mono CategoryTheory.SplitMonoCategory.isSplitMono_of_mono
 
 /-- A split epi category is a category in which every epimorphism is split. -/
 class SplitEpiCategory where
   /-- All epis are split -/
   isSplitEpi_of_epi : ∀ {X Y : C} (f : X ⟶ Y) [Epi f], IsSplitEpi f
 #align category_theory.split_epi_category CategoryTheory.SplitEpiCategory
+#align category_theory.split_epi_category.is_split_epi_of_epi CategoryTheory.SplitEpiCategory.isSplitEpi_of_epi
 
 end

48085f14

feat: port CategoryTheory.EpiMono (#2292)

238118c2

`category_theory.epi_mono` ⟷ `Mathlib.CategoryTheory.EpiMono`

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 48

category_theory.epi_mono ⟷ Mathlib.CategoryTheory.EpiMono

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 48

`category_theory.epi_mono` ⟷ `Mathlib.CategoryTheory.EpiMono`