category_theory.isomorphism_classes | 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

28aa996f

(last sync)

Changes in mathlib3port

mathlib3

mathlib3port

3dadefa3

bump to nightly-2023-09-24-06

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

5655435f

Diff

@@ -3,9 +3,9 @@ Copyright (c) 2019 Yury Kudryashov. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Yury Kudryashov
 -/
-import Mathbin.CategoryTheory.Category.Cat
-import Mathbin.CategoryTheory.Groupoid
-import Mathbin.CategoryTheory.Types
+import CategoryTheory.Category.Cat
+import CategoryTheory.Groupoid
+import CategoryTheory.Types
 
 #align_import category_theory.isomorphism_classes from "leanprover-community/mathlib"@"3dadefa3f544b1db6214777fe47910739b54c66a"

3dadefa3

bump to nightly-2023-07-20-09

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

9c56d0dd

Diff

@@ -2,16 +2,13 @@
 Copyright (c) 2019 Yury Kudryashov. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Yury Kudryashov
-
-! This file was ported from Lean 3 source module category_theory.isomorphism_classes
-! leanprover-community/mathlib commit 3dadefa3f544b1db6214777fe47910739b54c66a
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathbin.CategoryTheory.Category.Cat
 import Mathbin.CategoryTheory.Groupoid
 import Mathbin.CategoryTheory.Types
 
+#align_import category_theory.isomorphism_classes from "leanprover-community/mathlib"@"3dadefa3f544b1db6214777fe47910739b54c66a"
+
 /-!
 # Objects of a category up to an isomorphism

3dadefa3

bump to nightly-2023-02-24-03

mathlib commit https://github.com/leanprover-community/mathlib/commit/22131150f88a2d125713ffa0f4693e3355b1eb49

2d8bd121

Diff

@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Yury Kudryashov
 
 ! This file was ported from Lean 3 source module category_theory.isomorphism_classes
-! leanprover-community/mathlib commit d6814c584384ddf2825ff038e868451a7c956f31
+! leanprover-community/mathlib commit 3dadefa3f544b1db6214777fe47910739b54c66a
 ! Please do not edit these lines, except to modify the commit id
 ! if you have ported upstream changes.
 -/
@@ -15,6 +15,9 @@ import Mathbin.CategoryTheory.Types
 /-!
 # Objects of a category up to an isomorphism
 
+> THIS FILE IS SYNCHRONIZED WITH MATHLIB4.
+> Any changes to this file require a corresponding PR to mathlib4.
+
 `is_isomorphic X Y := nonempty (X ≅ Y)` is an equivalence relation on the objects of a category.
 The quotient with respect to this relation defines a functor from our category to `Type`.
 -/

d6814c58

bump to nightly-2023-02-22-06

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

87465ac3

Diff

@@ -28,20 +28,25 @@ section Category
 
 variable {C : Type u} [Category.{v} C]
 
+#print CategoryTheory.IsIsomorphic /-
 /-- An object `X` is isomorphic to an object `Y`, if `X ≅ Y` is not empty. -/
 def IsIsomorphic : C → C → Prop := fun X Y => Nonempty (X ≅ Y)
 #align category_theory.is_isomorphic CategoryTheory.IsIsomorphic
+-/
 
 variable (C)
 
+#print CategoryTheory.isIsomorphicSetoid /-
 /-- `is_isomorphic` defines a setoid. -/
 def isIsomorphicSetoid : Setoid C where
   R := IsIsomorphic
   iseqv := ⟨fun X => ⟨Iso.refl X⟩, fun X Y ⟨α⟩ => ⟨α.symm⟩, fun X Y Z ⟨α⟩ ⟨β⟩ => ⟨α.trans β⟩⟩
 #align category_theory.is_isomorphic_setoid CategoryTheory.isIsomorphicSetoid
+-/
 
 end Category
 
+#print CategoryTheory.isomorphismClasses /-
 /-- The functor that sends each category to the quotient space of its objects up to an isomorphism.
 -/
 def isomorphismClasses : Cat.{v, u} ⥤ Type u
@@ -49,11 +54,14 @@ def isomorphismClasses : Cat.{v, u} ⥤ Type u
   obj C := Quotient (isIsomorphicSetoid C.α)
   map C D F := Quot.map F.obj fun X Y ⟨f⟩ => ⟨F.mapIso f⟩
 #align category_theory.isomorphism_classes CategoryTheory.isomorphismClasses
+-/
 
+#print CategoryTheory.Groupoid.isIsomorphic_iff_nonempty_hom /-
 theorem Groupoid.isIsomorphic_iff_nonempty_hom {C : Type u} [Groupoid.{v} C] {X Y : C} :
     IsIsomorphic X Y ↔ Nonempty (X ⟶ Y) :=
   (Groupoid.isoEquivHom X Y).nonempty_congr
 #align category_theory.groupoid.is_isomorphic_iff_nonempty_hom CategoryTheory.Groupoid.isIsomorphic_iff_nonempty_hom
+-/
 
 -- PROJECT: define `skeletal`, and show every category is equivalent to a skeletal category,
 -- using the axiom of choice to pick a representative of every isomorphism class.

d6814c58

bump to nightly-2023-02-21-16

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

1107b979

Changes in mathlib4

mathlib3

mathlib4

28aa996f

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

@@ -2,16 +2,13 @@
 Copyright (c) 2019 Yury Kudryashov. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Yury Kudryashov
-
-! This file was ported from Lean 3 source module category_theory.isomorphism_classes
-! leanprover-community/mathlib commit 28aa996fc6fb4317f0083c4e6daf79878d81be33
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathlib.CategoryTheory.Category.Cat
 import Mathlib.CategoryTheory.Groupoid
 import Mathlib.CategoryTheory.Types
 
+#align_import category_theory.isomorphism_classes from "leanprover-community/mathlib"@"28aa996fc6fb4317f0083c4e6daf79878d81be33"
+
 /-!
 # Objects of a category up to an isomorphism

28aa996f

chore: tidy various files (#2446)

54bf6e04

Diff

@@ -34,7 +34,7 @@ def IsIsomorphic : C → C → Prop := fun X Y => Nonempty (X ≅ Y)
 
 variable (C)
 
-/-- `is_isomorphic` defines a setoid. -/
+/-- `IsIsomorphic` defines a setoid. -/
 def isIsomorphicSetoid : Setoid C where
   r := IsIsomorphic
   iseqv := ⟨fun X => ⟨Iso.refl X⟩, fun ⟨α⟩ => ⟨α.symm⟩, fun ⟨α⟩ ⟨β⟩ => ⟨α.trans β⟩⟩
@@ -46,21 +46,21 @@ end Category
 -/
 def isomorphismClasses : Cat.{v, u} ⥤ Type u where
   obj C := Quotient (isIsomorphicSetoid C.α)
-  map {C} {D} F := Quot.map F.obj fun X Y ⟨f⟩ => ⟨F.mapIso f⟩
+  map {C D} F := Quot.map F.obj fun X Y ⟨f⟩ => ⟨F.mapIso f⟩
   map_id {C} := by  -- Porting note: this used to be `tidy`
     dsimp; apply funext; intro x
-    apply x.recOn  -- Porting note: `induction x` not working yet 
-    · intro _ _ p 
+    apply x.recOn  -- Porting note: `induction x` not working yet
+    · intro _ _ p
       simp only [types_id_apply]
-    · intro _ 
-      rfl 
-  map_comp {C} {D} {E} f g := by -- Porting note(s): idem
+    · intro _
+      rfl
+  map_comp {C D E} f g := by -- Porting note(s): idem
     dsimp; apply funext; intro x
-    apply x.recOn 
-    · intro _ _ _ 
+    apply x.recOn
+    · intro _ _ _
       simp only [types_id_apply]
     · intro _
-      rfl 
+      rfl
 #align category_theory.isomorphism_classes CategoryTheory.isomorphismClasses
 
 theorem Groupoid.isIsomorphic_iff_nonempty_hom {C : Type u} [Groupoid.{v} C] {X Y : C} :
@@ -69,4 +69,3 @@ theorem Groupoid.isIsomorphic_iff_nonempty_hom {C : Type u} [Groupoid.{v} C] {X
 #align category_theory.groupoid.is_isomorphic_iff_nonempty_hom CategoryTheory.Groupoid.isIsomorphic_iff_nonempty_hom
 
 end CategoryTheory
-

28aa996f

feat: port CategoryTheory.IsomorphismClasses (#2394)

b2dca69e

`category_theory.isomorphism_classes` ⟷ `Mathlib.CategoryTheory.IsomorphismClasses`

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 59

category_theory.isomorphism_classes ⟷ Mathlib.CategoryTheory.IsomorphismClasses

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 59

`category_theory.isomorphism_classes` ⟷ `Mathlib.CategoryTheory.IsomorphismClasses`