category_theory.whiskering | 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

d012cd09

(last sync)

Changes in mathlib3port

mathlib3

mathlib3port

c3291da4

bump to nightly-2024-04-14-09

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

f736ea6b

Diff

@@ -113,8 +113,8 @@ def whiskeringRight : (D ⥤ E) ⥤ (C ⥤ D) ⥤ C ⥤ E
 variable {C} {D} {E}
 
 #print CategoryTheory.faithful_whiskeringRight_obj /-
-instance faithful_whiskeringRight_obj {F : D ⥤ E} [Faithful F] :
-    Faithful ((whiskeringRight C D E).obj F)
+instance faithful_whiskeringRight_obj {F : D ⥤ E} [CategoryTheory.Functor.Faithful F] :
+    CategoryTheory.Functor.Faithful ((whiskeringRight C D E).obj F)
     where map_injective' G H α β hαβ :=
     NatTrans.ext _ _ <|
       funext fun X => Functor.map_injective _ <| congr_fun (congr_arg NatTrans.app hαβ) X

c3291da4

bump to nightly-2024-04-06-08

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

e34029c9

Diff

@@ -3,7 +3,7 @@ Copyright (c) 2018 Scott Morrison. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Scott Morrison
 -/
-import CategoryTheory.Isomorphism
+import CategoryTheory.Iso
 import CategoryTheory.Functor.Category
 import CategoryTheory.Functor.FullyFaithful

c3291da4

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) 2018 Scott Morrison. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Scott Morrison
 -/
-import Mathbin.CategoryTheory.Isomorphism
-import Mathbin.CategoryTheory.Functor.Category
-import Mathbin.CategoryTheory.Functor.FullyFaithful
+import CategoryTheory.Isomorphism
+import CategoryTheory.Functor.Category
+import CategoryTheory.Functor.FullyFaithful
 
 #align_import category_theory.whiskering from "leanprover-community/mathlib"@"c3291da49cfa65f0d43b094750541c0731edc932"

c3291da4

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) 2018 Scott Morrison. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Scott Morrison
-
-! This file was ported from Lean 3 source module category_theory.whiskering
-! leanprover-community/mathlib commit c3291da49cfa65f0d43b094750541c0731edc932
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathbin.CategoryTheory.Isomorphism
 import Mathbin.CategoryTheory.Functor.Category
 import Mathbin.CategoryTheory.Functor.FullyFaithful
 
+#align_import category_theory.whiskering from "leanprover-community/mathlib"@"c3291da49cfa65f0d43b094750541c0731edc932"
+
 /-!
 # Whiskering

c3291da4

bump to nightly-2023-06-13-21

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

829520ac

Diff

@@ -115,12 +115,14 @@ def whiskeringRight : (D ⥤ E) ⥤ (C ⥤ D) ⥤ C ⥤ E
 
 variable {C} {D} {E}
 
+#print CategoryTheory.faithful_whiskeringRight_obj /-
 instance faithful_whiskeringRight_obj {F : D ⥤ E} [Faithful F] :
     Faithful ((whiskeringRight C D E).obj F)
     where map_injective' G H α β hαβ :=
     NatTrans.ext _ _ <|
       funext fun X => Functor.map_injective _ <| congr_fun (congr_arg NatTrans.app hαβ) X
 #align category_theory.faithful_whiskering_right_obj CategoryTheory.faithful_whiskeringRight_obj
+-/
 
 #print CategoryTheory.whiskerLeft_id /-
 @[simp]

c3291da4

bump to nightly-2023-05-28-06

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

ba5d8b97

Diff

@@ -115,12 +115,6 @@ def whiskeringRight : (D ⥤ E) ⥤ (C ⥤ D) ⥤ C ⥤ E
 
 variable {C} {D} {E}
 
-/- warning: category_theory.faithful_whiskering_right_obj -> CategoryTheory.faithful_whiskeringRight_obj is a dubious translation:
-lean 3 declaration is
-  forall {C : Type.{u1}} [_inst_1 : CategoryTheory.Category.{u2, u1} C] {D : Type.{u3}} [_inst_2 : CategoryTheory.Category.{u4, u3} D] {E : Type.{u5}} [_inst_3 : CategoryTheory.Category.{u6, u5} E] {F : CategoryTheory.Functor.{u4, u6, u3, u5} D _inst_2 E _inst_3} [_inst_4 : CategoryTheory.Faithful.{u4, u6, u3, u5} D _inst_2 E _inst_3 F], CategoryTheory.Faithful.{max u1 u4, max u1 u6, max u2 u4 u1 u3, max u2 u6 u1 u5} (CategoryTheory.Functor.{u2, u4, u1, u3} C _inst_1 D _inst_2) (CategoryTheory.Functor.category.{u2, u4, u1, u3} C _inst_1 D _inst_2) (CategoryTheory.Functor.{u2, u6, u1, u5} C _inst_1 E _inst_3) (CategoryTheory.Functor.category.{u2, u6, u1, u5} C _inst_1 E _inst_3) (CategoryTheory.Functor.obj.{max u3 u6, max (max u2 u4 u1 u3) u1 u6, max u4 u6 u3 u5, max (max u1 u4) (max u1 u6) (max u2 u4 u1 u3) u2 u6 u1 u5} (CategoryTheory.Functor.{u4, u6, u3, u5} D _inst_2 E _inst_3) (CategoryTheory.Functor.category.{u4, u6, u3, u5} D _inst_2 E _inst_3) (CategoryTheory.Functor.{max u1 u4, max u1 u6, max u2 u4 u1 u3, max u2 u6 u1 u5} (CategoryTheory.Functor.{u2, u4, u1, u3} C _inst_1 D _inst_2) (CategoryTheory.Functor.category.{u2, u4, u1, u3} C _inst_1 D _inst_2) (CategoryTheory.Functor.{u2, u6, u1, u5} C _inst_1 E _inst_3) (CategoryTheory.Functor.category.{u2, u6, u1, u5} C _inst_1 E _inst_3)) (CategoryTheory.Functor.category.{max u1 u4, max u1 u6, max u2 u4 u1 u3, max u2 u6 u1 u5} (CategoryTheory.Functor.{u2, u4, u1, u3} C _inst_1 D _inst_2) (CategoryTheory.Functor.category.{u2, u4, u1, u3} C _inst_1 D _inst_2) (CategoryTheory.Functor.{u2, u6, u1, u5} C _inst_1 E _inst_3) (CategoryTheory.Functor.category.{u2, u6, u1, u5} C _inst_1 E _inst_3)) (CategoryTheory.whiskeringRight.{u1, u2, u3, u4, u5, u6} C _inst_1 D _inst_2 E _inst_3) F)
-but is expected to have type
-  forall {C : Type.{u1}} [_inst_1 : CategoryTheory.Category.{u2, u1} C] {D : Type.{u3}} [_inst_2 : CategoryTheory.Category.{u4, u3} D] {E : Type.{u5}} [_inst_3 : CategoryTheory.Category.{u6, u5} E] {F : CategoryTheory.Functor.{u4, u6, u3, u5} D _inst_2 E _inst_3} [_inst_4 : CategoryTheory.Faithful.{u4, u6, u3, u5} D _inst_2 E _inst_3 F], CategoryTheory.Faithful.{max u1 u4, max u1 u6, max (max (max u1 u3) u2) u4, max (max (max u1 u5) u2) u6} (CategoryTheory.Functor.{u2, u4, u1, u3} C _inst_1 D _inst_2) (CategoryTheory.Functor.category.{u2, u4, u1, u3} C _inst_1 D _inst_2) (CategoryTheory.Functor.{u2, u6, u1, u5} C _inst_1 E _inst_3) (CategoryTheory.Functor.category.{u2, u6, u1, u5} C _inst_1 E _inst_3) (Prefunctor.obj.{max (succ u3) (succ u6), max (max (max (max (succ u1) (succ u3)) (succ u2)) (succ u4)) (succ u6), max (max (max u3 u5) u4) u6, max (max (max (max (max u1 u3) u5) u2) u4) u6} (CategoryTheory.Functor.{u4, u6, u3, u5} D _inst_2 E _inst_3) (CategoryTheory.CategoryStruct.toQuiver.{max u3 u6, max (max (max u3 u5) u4) u6} (CategoryTheory.Functor.{u4, u6, u3, u5} D _inst_2 E _inst_3) (CategoryTheory.Category.toCategoryStruct.{max u3 u6, max (max (max u3 u5) u4) u6} (CategoryTheory.Functor.{u4, u6, u3, u5} D _inst_2 E _inst_3) (CategoryTheory.Functor.category.{u4, u6, u3, u5} D _inst_2 E _inst_3))) (CategoryTheory.Functor.{max u1 u4, max u1 u6, max (max (max u3 u1) u4) u2, max (max (max u5 u1) u6) u2} (CategoryTheory.Functor.{u2, u4, u1, u3} C _inst_1 D _inst_2) (CategoryTheory.Functor.category.{u2, u4, u1, u3} C _inst_1 D _inst_2) (CategoryTheory.Functor.{u2, u6, u1, u5} C _inst_1 E _inst_3) (CategoryTheory.Functor.category.{u2, u6, u1, u5} C _inst_1 E _inst_3)) (CategoryTheory.CategoryStruct.toQuiver.{max (max (max (max u1 u3) u2) u4) u6, max (max (max (max (max u1 u3) u5) u2) u4) u6} (CategoryTheory.Functor.{max u1 u4, max u1 u6, max (max (max u3 u1) u4) u2, max (max (max u5 u1) u6) u2} (CategoryTheory.Functor.{u2, u4, u1, u3} C _inst_1 D _inst_2) (CategoryTheory.Functor.category.{u2, u4, u1, u3} C _inst_1 D _inst_2) (CategoryTheory.Functor.{u2, u6, u1, u5} C _inst_1 E _inst_3) (CategoryTheory.Functor.category.{u2, u6, u1, u5} C _inst_1 E _inst_3)) (CategoryTheory.Category.toCategoryStruct.{max (max (max (max u1 u3) u2) u4) u6, max (max (max (max (max u1 u3) u5) u2) u4) u6} (CategoryTheory.Functor.{max u1 u4, max u1 u6, max (max (max u3 u1) u4) u2, max (max (max u5 u1) u6) u2} (CategoryTheory.Functor.{u2, u4, u1, u3} C _inst_1 D _inst_2) (CategoryTheory.Functor.category.{u2, u4, u1, u3} C _inst_1 D _inst_2) (CategoryTheory.Functor.{u2, u6, u1, u5} C _inst_1 E _inst_3) (CategoryTheory.Functor.category.{u2, u6, u1, u5} C _inst_1 E _inst_3)) (CategoryTheory.Functor.category.{max u1 u4, max u1 u6, max (max (max u1 u3) u2) u4, max (max (max u1 u5) u2) u6} (CategoryTheory.Functor.{u2, u4, u1, u3} C _inst_1 D _inst_2) (CategoryTheory.Functor.category.{u2, u4, u1, u3} C _inst_1 D _inst_2) (CategoryTheory.Functor.{u2, u6, u1, u5} C _inst_1 E _inst_3) (CategoryTheory.Functor.category.{u2, u6, u1, u5} C _inst_1 E _inst_3)))) (CategoryTheory.Functor.toPrefunctor.{max u3 u6, max (max (max (max u1 u3) u2) u4) u6, max (max (max u3 u5) u4) u6, max (max (max (max (max u1 u3) u5) u2) u4) u6} (CategoryTheory.Functor.{u4, u6, u3, u5} D _inst_2 E _inst_3) (CategoryTheory.Functor.category.{u4, u6, u3, u5} D _inst_2 E _inst_3) (CategoryTheory.Functor.{max u1 u4, max u1 u6, max (max (max u3 u1) u4) u2, max (max (max u5 u1) u6) u2} (CategoryTheory.Functor.{u2, u4, u1, u3} C _inst_1 D _inst_2) (CategoryTheory.Functor.category.{u2, u4, u1, u3} C _inst_1 D _inst_2) (CategoryTheory.Functor.{u2, u6, u1, u5} C _inst_1 E _inst_3) (CategoryTheory.Functor.category.{u2, u6, u1, u5} C _inst_1 E _inst_3)) (CategoryTheory.Functor.category.{max u1 u4, max u1 u6, max (max (max u1 u3) u2) u4, max (max (max u1 u5) u2) u6} (CategoryTheory.Functor.{u2, u4, u1, u3} C _inst_1 D _inst_2) (CategoryTheory.Functor.category.{u2, u4, u1, u3} C _inst_1 D _inst_2) (CategoryTheory.Functor.{u2, u6, u1, u5} C _inst_1 E _inst_3) (CategoryTheory.Functor.category.{u2, u6, u1, u5} C _inst_1 E _inst_3)) (CategoryTheory.whiskeringRight.{u1, u2, u3, u4, u5, u6} C _inst_1 D _inst_2 E _inst_3)) F)
-Case conversion may be inaccurate. Consider using '#align category_theory.faithful_whiskering_right_obj CategoryTheory.faithful_whiskeringRight_objₓ'. -/
 instance faithful_whiskeringRight_obj {F : D ⥤ E} [Faithful F] :
     Faithful ((whiskeringRight C D E).obj F)
     where map_injective' G H α β hαβ :=

c3291da4

bump to nightly-2023-05-28-04

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

6797a637

Diff

@@ -326,10 +326,7 @@ theorem assoc (F : A ⥤ B) (G : B ⥤ C) (H : C ⥤ D) : (F ⋙ G) ⋙ H = F 
 theorem triangle (F : A ⥤ B) (G : B ⥤ C) :
     (associator F (𝟭 B) G).Hom ≫ whiskerLeft F (leftUnitor G).Hom =
       whiskerRight (rightUnitor F).Hom G :=
-  by
-  ext
-  dsimp
-  simp
+  by ext; dsimp; simp
 #align category_theory.functor.triangle CategoryTheory.Functor.triangle
 -/
 
@@ -343,10 +340,7 @@ theorem pentagon :
     whiskerRight (associator F G H).Hom K ≫
         (associator F (G ⋙ H) K).Hom ≫ whiskerLeft F (associator G H K).Hom =
       (associator (F ⋙ G) H K).Hom ≫ (associator F G (H ⋙ K)).Hom :=
-  by
-  ext
-  dsimp
-  simp
+  by ext; dsimp; simp
 #align category_theory.functor.pentagon CategoryTheory.Functor.pentagon
 -/

c3291da4

bump to nightly-2023-02-21-16

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

1107b979

Changes in mathlib4

mathlib3

mathlib4

d012cd09

feat(CategoryTheory): whiskering a fully faithful functor is full (#12527)

We already had that whiskering by a faithful functor is faithful. This PR also adds the relevant Full and Faithful instances for the sheaf version of whiskering, (sheafCompose).

333b54ae

Diff

@@ -114,6 +114,13 @@ instance faithful_whiskeringRight_obj {F : D ⥤ E} [F.Faithful] :
     exact F.map_injective <| congr_fun (congr_arg NatTrans.app hαβ) X
 #align category_theory.faithful_whiskering_right_obj CategoryTheory.faithful_whiskeringRight_obj
 
+instance full_whiskeringRight_obj {F : D ⥤ E} [F.Faithful] [F.Full] :
+    ((whiskeringRight C D E).obj F).Full where
+  map_surjective f := by
+    refine ⟨⟨fun P ↦ F.preimage (f.app P), fun _ _ _ ↦ F.map_injective ?_⟩, ?_⟩
+    · simpa using f.naturality _
+    · ext; simp
+
 @[simp]
 theorem whiskerLeft_id (F : C ⥤ D) {G : D ⥤ E} :
     whiskerLeft F (NatTrans.id G) = NatTrans.id (F.comp G) :=

d012cd09

chore: superfluous parentheses (#12116)

Co-authored-by: Moritz Firsching <firsching@google.com>

596d5eca

Diff

@@ -111,7 +111,7 @@ instance faithful_whiskeringRight_obj {F : D ⥤ E} [F.Faithful] :
     ((whiskeringRight C D E).obj F).Faithful where
   map_injective hαβ := by
     ext X
-    exact (F.map_injective <| congr_fun (congr_arg NatTrans.app hαβ) X)
+    exact F.map_injective <| congr_fun (congr_arg NatTrans.app hαβ) X
 #align category_theory.faithful_whiskering_right_obj CategoryTheory.faithful_whiskeringRight_obj
 
 @[simp]

d012cd09

chore(CategoryTheory): move Full, Faithful, EssSurj, IsEquivalence and ReflectsIsomorphisms to the Functor namespace (#11985)

These notions on functors are now Functor.Full, Functor.Faithful, Functor.EssSurj, Functor.IsEquivalence, Functor.ReflectsIsomorphisms. Deprecated aliases are introduced for the previous names.

65b7affc

Diff

@@ -107,8 +107,8 @@ def whiskeringRight : (D ⥤ E) ⥤ (C ⥤ D) ⥤ C ⥤ E where
 
 variable {C} {D} {E}
 
-instance faithful_whiskeringRight_obj {F : D ⥤ E} [Faithful F] :
-    Faithful ((whiskeringRight C D E).obj F) where
+instance faithful_whiskeringRight_obj {F : D ⥤ E} [F.Faithful] :
+    ((whiskeringRight C D E).obj F).Faithful where
   map_injective hαβ := by
     ext X
     exact (F.map_injective <| congr_fun (congr_arg NatTrans.app hαβ) X)

d012cd09

chore(*): remove empty lines between variable statements (#11418)

Empty lines were removed by executing the following Python script twice

import os
import re


# Loop through each file in the repository
for dir_path, dirs, files in os.walk('.'):
  for filename in files:
    if filename.endswith('.lean'):
      file_path = os.path.join(dir_path, filename)

      # Open the file and read its contents
      with open(file_path, 'r') as file:
        content = file.read()

      # Use a regular expression to replace sequences of "variable" lines separated by empty lines
      # with sequences without empty lines
      modified_content = re.sub(r'(variable.*\n)\n(variable(?! .* in))', r'\1\2', content)

      # Write the modified content back to the file
      with open(file_path, 'w') as file:
        file.write(modified_content)

75c86f04

Diff

@@ -226,7 +226,6 @@ namespace Functor
 universe u₅ v₅
 
 variable {A : Type u₁} [Category.{v₁} A]
-
 variable {B : Type u₂} [Category.{v₂} B]
 
 /-- The left unitor, a natural isomorphism `((𝟭 _) ⋙ F) ≅ F`.
@@ -252,7 +251,6 @@ def rightUnitor (F : A ⥤ B) :
 #align category_theory.functor.right_unitor_inv_app CategoryTheory.Functor.rightUnitor_inv_app
 
 variable {C : Type u₃} [Category.{v₃} C]
-
 variable {D : Type u₄} [Category.{v₄} D]
 
 /-- The associator for functors, a natural isomorphism `((F ⋙ G) ⋙ H) ≅ (F ⋙ (G ⋙ H))`.
@@ -280,7 +278,6 @@ theorem triangle (F : A ⥤ B) (G : B ⥤ C) :
 
 -- See note [dsimp, simp].
 variable {E : Type u₅} [Category.{v₅} E]
-
 variable (F : A ⥤ B) (G : B ⥤ C) (H : C ⥤ D) (K : D ⥤ E)
 
 theorem pentagon :

d012cd09

feat(CategoryTheory/Functor): definition of Kan extensions (#10195)

This PR introduces basic definitions for Kan extensions of functors. It prepares for future development of derived functors and a refactor of the file CategoryTheory.Limits.KanExtension.

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

a1d9afe7

Diff

@@ -136,13 +136,13 @@ theorem whiskerRight_id' {G : C ⥤ D} (F : D ⥤ E) : whiskerRight (𝟙 G) F =
   ((whiskeringRight C D E).obj F).map_id _
 #align category_theory.whisker_right_id' CategoryTheory.whiskerRight_id'
 
-@[simp]
+@[simp, reassoc]
 theorem whiskerLeft_comp (F : C ⥤ D) {G H K : D ⥤ E} (α : G ⟶ H) (β : H ⟶ K) :
     whiskerLeft F (α ≫ β) = whiskerLeft F α ≫ whiskerLeft F β :=
   rfl
 #align category_theory.whisker_left_comp CategoryTheory.whiskerLeft_comp
 
-@[simp]
+@[simp, reassoc]
 theorem whiskerRight_comp {G H K : C ⥤ D} (α : G ⟶ H) (β : H ⟶ K) (F : D ⥤ E) :
     whiskerRight (α ≫ β) F = whiskerRight α F ≫ whiskerRight β F :=
   ((whiskeringRight C D E).obj F).map_comp α β

d012cd09

style: fix multiple spaces before colon (#7411)

Purely cosmetic PR

41584956

Diff

@@ -12,7 +12,7 @@ import Mathlib.CategoryTheory.Functor.FullyFaithful
 /-!
 # Whiskering
 
-Given a functor `F  : C ⥤ D` and functors `G H : D ⥤ E` and a natural transformation `α : G ⟶ H`,
+Given a functor `F : C ⥤ D` and functors `G H : D ⥤ E` and a natural transformation `α : G ⟶ H`,
 we can construct a new natural transformation `F ⋙ G ⟶ F ⋙ H`,
 called `whiskerLeft F α`. This is the same as the horizontal composition of `𝟙 F` with `α`.

d012cd09

chore: remove 'Ported by' headers (#6018)

Briefly during the port we were adding "Ported by" headers, but only ~60 / 3000 files ended up with such a header.

I propose deleting them.

We could consider adding these uniformly via a script, as part of the great history rewrite...?

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

e8318a88

Diff

@@ -2,7 +2,6 @@
 Copyright (c) 2018 Scott Morrison. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Scott Morrison
-Ported by: Joël Riou
 -/
 import Mathlib.CategoryTheory.Iso
 import Mathlib.CategoryTheory.Functor.Category

d012cd09

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

@@ -3,16 +3,13 @@ Copyright (c) 2018 Scott Morrison. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Scott Morrison
 Ported by: Joël Riou
-
-! This file was ported from Lean 3 source module category_theory.whiskering
-! leanprover-community/mathlib commit d012cd09a9b256d870751284dd6a29882b0be105
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathlib.CategoryTheory.Iso
 import Mathlib.CategoryTheory.Functor.Category
 import Mathlib.CategoryTheory.Functor.FullyFaithful
 
+#align_import category_theory.whiskering from "leanprover-community/mathlib"@"d012cd09a9b256d870751284dd6a29882b0be105"
+
 /-!
 # Whiskering

d012cd09

chore: add @[ext] lemmas for NatTrans synonyms (#5228)

Co-authored-by: Scott Morrison <scott.morrison@anu.edu.au>

5ed7d916

Diff

@@ -113,8 +113,9 @@ variable {C} {D} {E}
 
 instance faithful_whiskeringRight_obj {F : D ⥤ E} [Faithful F] :
     Faithful ((whiskeringRight C D E).obj F) where
-  map_injective hαβ := NatTrans.ext _ _
-    (funext fun X => (F.map_injective <| congr_fun (congr_arg NatTrans.app hαβ) X))
+  map_injective hαβ := by
+    ext X
+    exact (F.map_injective <| congr_fun (congr_arg NatTrans.app hαβ) X)
 #align category_theory.faithful_whiskering_right_obj CategoryTheory.faithful_whiskeringRight_obj
 
 @[simp]

d012cd09

chore: add missing #align statements (#1902)

This PR is the result of a slight variant on the following "algorithm"

take all mathlib 3 names, remove _ and make all uppercase letters into lowercase
take all mathlib 4 names, remove _ and make all uppercase letters into lowercase
look for matches, and create pairs (original_lean3_name, OriginalLean4Name)
for pairs that do not have an align statement:
- use Lean 4 to lookup the file + position of the Lean 4 name
- add an #align statement just before the next empty line
manually fix some tiny mistakes (e.g., empty lines in proofs might cause the #align statement to have been inserted too early)

b72bb858

Diff

@@ -53,6 +53,7 @@ def whiskerLeft (F : C ⥤ D) {G H : D ⥤ E} (α : G ⟶ H) :
   app X := α.app (F.obj X)
   naturality X Y f := by rw [Functor.comp_map, Functor.comp_map, α.naturality]
 #align category_theory.whisker_left CategoryTheory.whiskerLeft
+#align category_theory.whisker_left_app CategoryTheory.whiskerLeft_app
 
 /-- If `α : G ⟶ H` then
 `whisker_right α F : (G ⋙ F) ⟶ (G ⋙ F)` has components `F.map (α.app X)`.
@@ -64,6 +65,7 @@ def whiskerRight {G H : C ⥤ D} (α : G ⟶ H) (F : D ⥤ E) :
   naturality X Y f := by
     rw [Functor.comp_map, Functor.comp_map, ← F.map_comp, ← F.map_comp, α.naturality]
 #align category_theory.whisker_right CategoryTheory.whiskerRight
+#align category_theory.whisker_right_app CategoryTheory.whiskerRight_app
 
 variable (C D E)
 
@@ -83,6 +85,9 @@ def whiskeringLeft : (C ⥤ D) ⥤ (D ⥤ E) ⥤ C ⥤ E where
           naturality := fun X Y f => by dsimp; rw [← H.map_comp, ← H.map_comp, ← τ.naturality] }
       naturality := fun X Y f => by ext; dsimp; rw [f.naturality] }
 #align category_theory.whiskering_left CategoryTheory.whiskeringLeft
+#align category_theory.whiskering_left_obj_map CategoryTheory.whiskeringLeft_obj_map
+#align category_theory.whiskering_left_obj_obj CategoryTheory.whiskeringLeft_obj_obj
+#align category_theory.whiskering_left_map_app_app CategoryTheory.whiskeringLeft_map_app_app
 
 /-- Right-composition gives a functor `(D ⥤ E) ⥤ ((C ⥤ D) ⥤ (C ⥤ E))`.
 
@@ -100,6 +105,9 @@ def whiskeringRight : (D ⥤ E) ⥤ (C ⥤ D) ⥤ C ⥤ E where
           naturality := fun X Y f => by dsimp; rw [τ.naturality] }
       naturality := fun X Y f => by ext; dsimp; rw [← NatTrans.naturality] }
 #align category_theory.whiskering_right CategoryTheory.whiskeringRight
+#align category_theory.whiskering_right_map_app_app CategoryTheory.whiskeringRight_map_app_app
+#align category_theory.whiskering_right_obj_obj CategoryTheory.whiskeringRight_obj_obj
+#align category_theory.whiskering_right_obj_map CategoryTheory.whiskeringRight_obj_map
 
 variable {C} {D} {E}
 
@@ -232,6 +240,8 @@ def leftUnitor (F : A ⥤ B) :
   hom := { app := fun X => 𝟙 (F.obj X) }
   inv := { app := fun X => 𝟙 (F.obj X) }
 #align category_theory.functor.left_unitor CategoryTheory.Functor.leftUnitor
+#align category_theory.functor.left_unitor_inv_app CategoryTheory.Functor.leftUnitor_inv_app
+#align category_theory.functor.left_unitor_hom_app CategoryTheory.Functor.leftUnitor_hom_app
 
 /-- The right unitor, a natural isomorphism `(F ⋙ (𝟭 B)) ≅ F`.
 -/
@@ -241,6 +251,8 @@ def rightUnitor (F : A ⥤ B) :
   hom := { app := fun X => 𝟙 (F.obj X) }
   inv := { app := fun X => 𝟙 (F.obj X) }
 #align category_theory.functor.right_unitor CategoryTheory.Functor.rightUnitor
+#align category_theory.functor.right_unitor_hom_app CategoryTheory.Functor.rightUnitor_hom_app
+#align category_theory.functor.right_unitor_inv_app CategoryTheory.Functor.rightUnitor_inv_app
 
 variable {C : Type u₃} [Category.{v₃} C]
 
@@ -257,6 +269,8 @@ def associator (F : A ⥤ B) (G : B ⥤ C) (H : C ⥤ D) :
   hom := { app := fun _ => 𝟙 _ }
   inv := { app := fun _ => 𝟙 _ }
 #align category_theory.functor.associator CategoryTheory.Functor.associator
+#align category_theory.functor.associator_inv_app CategoryTheory.Functor.associator_inv_app
+#align category_theory.functor.associator_hom_app CategoryTheory.Functor.associator_hom_app
 
 protected theorem assoc (F : A ⥤ B) (G : B ⥤ C) (H : C ⥤ D) : (F ⋙ G) ⋙ H = F ⋙ G ⋙ H :=
   rfl

d012cd09

chore: fix most phantom #aligns (#1794)

3d3fb046

Diff

@@ -173,7 +173,7 @@ def isoWhiskerRight {G H : C ⥤ D} (α : G ≅ H) (F : D ⥤ E) : G ⋙ F ≅ H
 theorem isoWhiskerRight_hom {G H : C ⥤ D} (α : G ≅ H) (F : D ⥤ E) :
     (isoWhiskerRight α F).hom = whiskerRight α.hom F :=
   rfl
-#align category_theory.isoWhiskerRight_hom CategoryTheory.isoWhiskerRight_hom
+#align category_theory.iso_whisker_right_hom CategoryTheory.isoWhiskerRight_hom
 
 @[simp]
 theorem isoWhiskerRight_inv {G H : C ⥤ D} (α : G ≅ H) (F : D ⥤ E) :

d012cd09

feat: port CategoryTheory.Whiskering (#1071)

depends on: #846

Co-authored-by: Scott Morrison <scott.morrison@gmail.com> Co-authored-by: mpenciak <matej.penciak@gmail.com> Co-authored-by: Joël Riou <joel.riou@universite-paris-saclay.fr>

e49a66f4

`category_theory.whiskering` ⟷ `Mathlib.CategoryTheory.Whiskering`

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 6

category_theory.whiskering ⟷ Mathlib.CategoryTheory.Whiskering

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 6

`category_theory.whiskering` ⟷ `Mathlib.CategoryTheory.Whiskering`