category_theory.core | 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

369525b7

(last sync)

Changes in mathlib3port

mathlib3

mathlib3port

23aa88e3

bump to nightly-2024-04-14-09

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

f736ea6b

Diff

@@ -78,7 +78,7 @@ def inclusion : Core C ⥤ C where
 #align category_theory.core.inclusion CategoryTheory.Core.inclusion
 -/
 
-instance : Faithful (inclusion C) where
+instance : CategoryTheory.Functor.Faithful (inclusion C) where
 
 variable {C} {G : Type u₂} [Groupoid.{v₂} G]

23aa88e3

bump to nightly-2023-09-24-06

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

5655435f

Diff

@@ -3,10 +3,10 @@ Copyright (c) 2019 Scott Morrison All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Scott Morrison
 -/
-import Mathbin.Control.EquivFunctor
-import Mathbin.CategoryTheory.Groupoid
-import Mathbin.CategoryTheory.Whiskering
-import Mathbin.CategoryTheory.Types
+import Control.EquivFunctor
+import CategoryTheory.Groupoid
+import CategoryTheory.Whiskering
+import CategoryTheory.Types
 
 #align_import category_theory.core from "leanprover-community/mathlib"@"23aa88e32dcc9d2a24cca7bc23268567ed4cd7d6"

23aa88e3

bump to nightly-2023-07-20-09

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

9c56d0dd

Diff

@@ -2,17 +2,14 @@
 Copyright (c) 2019 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.core
-! leanprover-community/mathlib commit 23aa88e32dcc9d2a24cca7bc23268567ed4cd7d6
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathbin.Control.EquivFunctor
 import Mathbin.CategoryTheory.Groupoid
 import Mathbin.CategoryTheory.Whiskering
 import Mathbin.CategoryTheory.Types
 
+#align_import category_theory.core from "leanprover-community/mathlib"@"23aa88e32dcc9d2a24cca7bc23268567ed4cd7d6"
+
 /-!
 # The core of a category

23aa88e3

bump to nightly-2023-02-23-03

mathlib commit https://github.com/leanprover-community/mathlib/commit/3ade05ac9447ae31a22d2ea5423435e054131240

5c91f1b0

Diff

@@ -4,7 +4,7 @@ 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.core
-! leanprover-community/mathlib commit 14b69e9f3c16630440a2cbd46f1ddad0d561dee7
+! leanprover-community/mathlib commit 23aa88e32dcc9d2a24cca7bc23268567ed4cd7d6
 ! Please do not edit these lines, except to modify the commit id
 ! if you have ported upstream changes.
 -/
@@ -16,6 +16,9 @@ import Mathbin.CategoryTheory.Types
 /-!
 # The core of a category
 
+> THIS FILE IS SYNCHRONIZED WITH MATHLIB4.
+> Any changes to this file require a corresponding PR to mathlib4.
+
 The core of a category `C` is the (non-full) subcategory of `C` consisting of all objects,
 and all isomorphisms. We construct it as a `groupoid`.

14b69e9f

bump to nightly-2023-02-21-16

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

1107b979

Changes in mathlib4

mathlib3

mathlib4

369525b7

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

@@ -30,7 +30,7 @@ universe v₁ v₂ u₁ u₂
 -- morphism levels before object levels. See note [CategoryTheory universes].
 /-- The core of a category C is the groupoid whose morphisms are all the
 isomorphisms of C. -/
--- Porting note: This linter does not exist yet
+-- Porting note(#5171): linter not yet ported
 -- @[nolint has_nonempty_instance]
 
 def Core (C : Type u₁) := C

369525b7

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

@@ -67,7 +67,7 @@ def inclusion : Core C ⥤ C where
 #align category_theory.core.inclusion CategoryTheory.Core.inclusion
 
 -- Porting note: This worked without proof before.
-instance : Faithful (inclusion C) where
+instance : (inclusion C).Faithful where
   map_injective := by
     intro _ _
     apply Iso.ext

369525b7

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

@@ -66,7 +66,7 @@ def inclusion : Core C ⥤ C where
   map f := f.hom
 #align category_theory.core.inclusion CategoryTheory.Core.inclusion
 
--- porting note: This worked without proof before.
+-- Porting note: This worked without proof before.
 instance : Faithful (inclusion C) where
   map_injective := by
     intro _ _

369525b7

Refactor(Mathlib/CategoryTheory/Core): Make functorToCore compute (#10649)

Change functorToCore to use Groupoid.inv instead of IsIso.inv and as a consequence make it's computable.

f6d4f4c4

Diff

@@ -77,9 +77,9 @@ variable {C} {G : Type u₂} [Groupoid.{v₂} G]
 -- Note that this function is not functorial
 -- (consider the two functors from [0] to [1], and the natural transformation between them).
 /-- A functor from a groupoid to a category C factors through the core of C. -/
-noncomputable def functorToCore (F : G ⥤ C) : G ⥤ Core C where
+def functorToCore (F : G ⥤ C) : G ⥤ Core C where
   obj X := F.obj X
-  map f := ⟨F.map f, F.map (inv f), _, _⟩
+  map f := ⟨F.map f, F.map (Groupoid.inv f), _, _⟩
 #align category_theory.core.functor_to_core CategoryTheory.Core.functorToCore
 
 /-- We can functorially associate to any functor from a groupoid to the core of a category `C`,

369525b7

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

@@ -2,17 +2,14 @@
 Copyright (c) 2019 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.core
-! leanprover-community/mathlib commit 369525b73f229ccd76a6ec0e0e0bf2be57599768
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathlib.Control.EquivFunctor
 import Mathlib.CategoryTheory.Groupoid
 import Mathlib.CategoryTheory.Whiskering
 import Mathlib.CategoryTheory.Types
 
+#align_import category_theory.core from "leanprover-community/mathlib"@"369525b73f229ccd76a6ec0e0e0bf2be57599768"
+
 /-!
 # The core of a category

369525b7

chore: fix typos (#4518)

I ran codespell Mathlib and got tired halfway through the suggestions.

92beef58

Diff

@@ -69,7 +69,7 @@ def inclusion : Core C ⥤ C where
   map f := f.hom
 #align category_theory.core.inclusion CategoryTheory.Core.inclusion
 
--- porting note: This worked wihtout proof before.
+-- porting note: This worked without proof before.
 instance : Faithful (inclusion C) where
   map_injective := by
     intro _ _

369525b7

fix: category_theory -> CategoryTheory in note (#2357)

This changes the name of a library_note from "category_theory universes" to "CategoryTheory universes" to be more in line with the new naming conventions.

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

1640c545

Diff

@@ -30,7 +30,7 @@ namespace CategoryTheory
 
 universe v₁ v₂ u₁ u₂
 
--- morphism levels before object levels. See note [category_theory universes].
+-- morphism levels before object levels. See note [CategoryTheory universes].
 /-- The core of a category C is the groupoid whose morphisms are all the
 isomorphisms of C. -/
 -- Porting note: This linter does not exist yet

369525b7

chore: tidy various files (#2446)

54bf6e04

Diff

@@ -42,10 +42,10 @@ def Core (C : Type u₁) := C
 variable {C : Type u₁} [Category.{v₁} C]
 
 instance coreCategory : Groupoid.{v₁} (Core C) where
-  Hom := fun X Y : C => X ≅ Y
-  id := fun X => @Iso.refl C _ X
-  comp := @fun {X} {Y} {Z} f g => Iso.trans f g
-  inv := @fun X Y f => Iso.symm f
+  Hom (X Y : C) := X ≅ Y
+  id (X : C) := Iso.refl X
+  comp f g := Iso.trans f g
+  inv {X Y} f := Iso.symm f
 #align category_theory.core_category CategoryTheory.coreCategory
 
 namespace Core
@@ -66,7 +66,7 @@ variable (C)
 /-- The core of a category is naturally included in the category. -/
 def inclusion : Core C ⥤ C where
   obj := id
-  map := @fun X Y f => f.hom
+  map f := f.hom
 #align category_theory.core.inclusion CategoryTheory.Core.inclusion
 
 -- porting note: This worked wihtout proof before.
@@ -80,10 +80,9 @@ variable {C} {G : Type u₂} [Groupoid.{v₂} G]
 -- Note that this function is not functorial
 -- (consider the two functors from [0] to [1], and the natural transformation between them).
 /-- A functor from a groupoid to a category C factors through the core of C. -/
-noncomputable def functorToCore (F : G ⥤ C) : G ⥤ Core C
-    where
+noncomputable def functorToCore (F : G ⥤ C) : G ⥤ Core C where
   obj X := F.obj X
-  map := @fun X Y f => ⟨F.map f, F.map (inv f), _, _⟩
+  map f := ⟨F.map f, F.map (inv f), _, _⟩
 #align category_theory.core.functor_to_core CategoryTheory.Core.functorToCore
 
 /-- We can functorially associate to any functor from a groupoid to the core of a category `C`,
@@ -101,10 +100,10 @@ to a categorical functor `Core (Type u₁) ⥤ Core (Type u₂)`.
 def ofEquivFunctor (m : Type u₁ → Type u₂) [EquivFunctor m] : Core (Type u₁) ⥤ Core (Type u₂)
     where
   obj := m
-  map := @fun α β f => (EquivFunctor.mapEquiv m f.toEquiv).toIso
+  map f := (EquivFunctor.mapEquiv m f.toEquiv).toIso
   map_id α := by apply Iso.ext; funext x; exact congr_fun (EquivFunctor.map_refl' _) x
-  map_comp := @fun α β γ f g => by
-    apply Iso.ext; funext x; dsimp;
+  map_comp f g := by
+    apply Iso.ext; funext x; dsimp
     erw [Iso.toEquiv_comp, EquivFunctor.map_trans']
     rw [Function.comp]
 #align category_theory.of_equiv_functor CategoryTheory.ofEquivFunctor

369525b7

feat: port CategoryTheory.Core (#2305)

Co-authored-by: Moritz Firsching <firsching@google.com> Co-authored-by: Matthew Ballard <matt@mrb.email> Co-authored-by: Matthew Robert Ballard <100034030+mattrobball@users.noreply.github.com>

1a56e8d1

`category_theory.core` ⟷ `Mathlib.CategoryTheory.Core`

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 54

category_theory.core ⟷ Mathlib.CategoryTheory.Core

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 54

`category_theory.core` ⟷ `Mathlib.CategoryTheory.Core`