category_theory.closed.zero | 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

70fd9563

(last sync)

Changes in mathlib3port

mathlib3

mathlib3port

fd4551cf

bump to nightly-2024-04-06-08

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

e34029c9

Diff

@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Bhavik Mehta
 -/
 import CategoryTheory.Closed.Cartesian
-import CategoryTheory.Punit
+import CategoryTheory.PUnit
 import CategoryTheory.Conj
 import CategoryTheory.Limits.Shapes.ZeroObjects

fd4551cf

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) 2020 Bhavik Mehta. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Bhavik Mehta
 -/
-import Mathbin.CategoryTheory.Closed.Cartesian
-import Mathbin.CategoryTheory.Punit
-import Mathbin.CategoryTheory.Conj
-import Mathbin.CategoryTheory.Limits.Shapes.ZeroObjects
+import CategoryTheory.Closed.Cartesian
+import CategoryTheory.Punit
+import CategoryTheory.Conj
+import CategoryTheory.Limits.Shapes.ZeroObjects
 
 #align_import category_theory.closed.zero from "leanprover-community/mathlib"@"fd4551cfe4b7484b81c2c9ba3405edae27659676"

fd4551cf

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) 2020 Bhavik Mehta. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Bhavik Mehta
-
-! This file was ported from Lean 3 source module category_theory.closed.zero
-! leanprover-community/mathlib commit fd4551cfe4b7484b81c2c9ba3405edae27659676
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathbin.CategoryTheory.Closed.Cartesian
 import Mathbin.CategoryTheory.Punit
 import Mathbin.CategoryTheory.Conj
 import Mathbin.CategoryTheory.Limits.Shapes.ZeroObjects
 
+#align_import category_theory.closed.zero from "leanprover-community/mathlib"@"fd4551cfe4b7484b81c2c9ba3405edae27659676"
+
 /-!
 # A cartesian closed category with zero object is trivial

fd4551cf

bump to nightly-2023-06-13-21

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

829520ac

Diff

@@ -68,6 +68,7 @@ def uniqueHomsetOfZero [HasZeroObject C] (X Y : C) : Unique (X ⟶ Y) :=
 
 attribute [local instance] unique_homset_of_zero
 
+#print CategoryTheory.equivPUnit /-
 /-- A cartesian closed category with a zero object is equivalent to the category with one object and
 one morphism.
 -/
@@ -80,6 +81,7 @@ def equivPUnit [HasZeroObject C] : C ≌ Discrete PUnit :=
       fun X Y f => by decide)
     (Functor.punitExt _ _)
 #align category_theory.equiv_punit CategoryTheory.equivPUnit
+-/
 
 end CategoryTheory

fd4551cf

bump to nightly-2023-06-13-09

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

395b4fcf

Diff

@@ -71,15 +71,15 @@ attribute [local instance] unique_homset_of_zero
 /-- A cartesian closed category with a zero object is equivalent to the category with one object and
 one morphism.
 -/
-def equivPunit [HasZeroObject C] : C ≌ Discrete PUnit :=
+def equivPUnit [HasZeroObject C] : C ≌ Discrete PUnit :=
   Equivalence.mk (Functor.star C) (Functor.fromPUnit 0)
     (NatIso.ofComponents
       (fun X =>
         { Hom := default
           inv := default })
       fun X Y f => by decide)
-    (Functor.pUnitExt _ _)
-#align category_theory.equiv_punit CategoryTheory.equivPunit
+    (Functor.punitExt _ _)
+#align category_theory.equiv_punit CategoryTheory.equivPUnit
 
 end CategoryTheory

fd4551cf

bump to nightly-2023-06-11-03

mathlib commit https://github.com/leanprover-community/mathlib/commit/c471da714c044131b90c133701e51b877c246677

6960a941

Diff

@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Bhavik Mehta
 
 ! This file was ported from Lean 3 source module category_theory.closed.zero
-! leanprover-community/mathlib commit 70fd9563a21e7b963887c9360bd29b2393e6225a
+! leanprover-community/mathlib commit fd4551cfe4b7484b81c2c9ba3405edae27659676
 ! 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.Limits.Shapes.ZeroObjects
 /-!
 # A cartesian closed category with zero object is trivial
 
+> THIS FILE IS SYNCHRONIZED WITH MATHLIB4.
+> Any changes to this file require a corresponding PR to mathlib4.
+
 A cartesian closed category with zero object is trivial: it is equivalent to the category with one
 object and one morphism.

70fd9563

bump to nightly-2023-06-10-03

mathlib commit https://github.com/leanprover-community/mathlib/commit/a3e83f0fa4391c8740f7d773a7a9b74e311ae2a3

e13a28eb

Diff

@@ -38,6 +38,7 @@ variable {C : Type u} [Category.{v} C]
 
 variable [HasFiniteProducts C] [CartesianClosed C]
 
+#print CategoryTheory.uniqueHomsetOfInitialIsoTerminal /-
 /-- If a cartesian closed category has an initial object which is isomorphic to the terminal object,
 then each homset has exactly one element.
 -/
@@ -48,9 +49,11 @@ def uniqueHomsetOfInitialIsoTerminal [HasInitial C] (i : ⊥_ C ≅ ⊤_ C) (X Y
       _ ≃ (X ⨯ ⊥_ C ⟶ Y) := (Iso.homCongr (prod.mapIso (Iso.refl _) i.symm) (Iso.refl _))
       _ ≃ (⊥_ C ⟶ Y ^^ X) := (exp.adjunction _).homEquiv _ _
 #align category_theory.unique_homset_of_initial_iso_terminal CategoryTheory.uniqueHomsetOfInitialIsoTerminal
+-/
 
 open scoped ZeroObject
 
+#print CategoryTheory.uniqueHomsetOfZero /-
 /-- If a cartesian closed category has a zero object, each homset has exactly one element. -/
 def uniqueHomsetOfZero [HasZeroObject C] (X Y : C) : Unique (X ⟶ Y) :=
   by
@@ -58,6 +61,7 @@ def uniqueHomsetOfZero [HasZeroObject C] (X Y : C) : Unique (X ⟶ Y) :=
   apply unique_homset_of_initial_iso_terminal _ X Y
   refine' ⟨default, (default : ⊤_ C ⟶ 0) ≫ default, _, _⟩ <;> simp
 #align category_theory.unique_homset_of_zero CategoryTheory.uniqueHomsetOfZero
+-/
 
 attribute [local instance] unique_homset_of_zero

70fd9563

bump to nightly-2023-06-09-07

mathlib commit https://github.com/leanprover-community/mathlib/commit/7e5137f579de09a059a5ce98f364a04e221aabf0

16afdc39

Diff

@@ -47,7 +47,6 @@ def uniqueHomsetOfInitialIsoTerminal [HasInitial C] (i : ⊥_ C ≅ ⊤_ C) (X Y
       (X ⟶ Y) ≃ (X ⨯ ⊤_ C ⟶ Y) := Iso.homCongr (prod.rightUnitor _).symm (Iso.refl _)
       _ ≃ (X ⨯ ⊥_ C ⟶ Y) := (Iso.homCongr (prod.mapIso (Iso.refl _) i.symm) (Iso.refl _))
       _ ≃ (⊥_ C ⟶ Y ^^ X) := (exp.adjunction _).homEquiv _ _
-      
 #align category_theory.unique_homset_of_initial_iso_terminal CategoryTheory.uniqueHomsetOfInitialIsoTerminal
 
 open scoped ZeroObject

70fd9563

bump to nightly-2023-05-28-18

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

8d353152

Diff

@@ -50,7 +50,7 @@ def uniqueHomsetOfInitialIsoTerminal [HasInitial C] (i : ⊥_ C ≅ ⊤_ C) (X Y
       
 #align category_theory.unique_homset_of_initial_iso_terminal CategoryTheory.uniqueHomsetOfInitialIsoTerminal
 
-open ZeroObject
+open scoped ZeroObject
 
 /-- If a cartesian closed category has a zero object, each homset has exactly one element. -/
 def uniqueHomsetOfZero [HasZeroObject C] (X Y : C) : Unique (X ⟶ Y) :=

70fd9563

bump to nightly-2023-03-01-20

mathlib commit https://github.com/leanprover-community/mathlib/commit/4c586d291f189eecb9d00581aeb3dd998ac34442

20cadee0

Diff

@@ -45,7 +45,7 @@ def uniqueHomsetOfInitialIsoTerminal [HasInitial C] (i : ⊥_ C ≅ ⊤_ C) (X Y
   Equiv.unique <|
     calc
       (X ⟶ Y) ≃ (X ⨯ ⊤_ C ⟶ Y) := Iso.homCongr (prod.rightUnitor _).symm (Iso.refl _)
-      _ ≃ (X ⨯ ⊥_ C ⟶ Y) := Iso.homCongr (prod.mapIso (Iso.refl _) i.symm) (Iso.refl _)
+      _ ≃ (X ⨯ ⊥_ C ⟶ Y) := (Iso.homCongr (prod.mapIso (Iso.refl _) i.symm) (Iso.refl _))
       _ ≃ (⊥_ C ⟶ Y ^^ X) := (exp.adjunction _).homEquiv _ _
       
 #align category_theory.unique_homset_of_initial_iso_terminal CategoryTheory.uniqueHomsetOfInitialIsoTerminal

70fd9563

bump to nightly-2023-02-21-20

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

7f7a4bc1

Diff

@@ -66,13 +66,13 @@ attribute [local instance] unique_homset_of_zero
 one morphism.
 -/
 def equivPunit [HasZeroObject C] : C ≌ Discrete PUnit :=
-  Equivalence.mk (Functor.star C) (Functor.fromPunit 0)
+  Equivalence.mk (Functor.star C) (Functor.fromPUnit 0)
     (NatIso.ofComponents
       (fun X =>
         { Hom := default
           inv := default })
       fun X Y f => by decide)
-    (Functor.punitExt _ _)
+    (Functor.pUnitExt _ _)
 #align category_theory.equiv_punit CategoryTheory.equivPunit
 
 end CategoryTheory

70fd9563

bump to nightly-2023-02-21-16

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

1107b979

Changes in mathlib4

mathlib3

mathlib4

70fd9563

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

@@ -32,7 +32,6 @@ namespace CategoryTheory
 open Category Limits
 
 variable {C : Type u} [Category.{v} C]
-
 variable [HasFiniteProducts C] [CartesianClosed C]
 
 /-- If a cartesian closed category has an initial object which is isomorphic to the terminal object,

70fd9563

fix: attribute [simp] ... in -> attribute [local simp] ... in (#7678)

Mathlib.Logic.Unique contains the line attribute [simp] eq_iff_true_of_subsingleton in ...:

https://github.com/leanprover-community/mathlib4/blob/96a11c7aac574c00370c2b3dab483cb676405c5d/Mathlib/Logic/Unique.lean#L255-L256

Despite what the in part may imply, this adds the lemma to the simp set "globally", including for downstream files; it is likely that attribute [local simp] eq_iff_true_of_subsingleton in ... was meant instead (or maybe scoped simp, but I think "scoped" refers to the current namespace). Indeed, the relevant lemma is not marked with @[simp] for possible slowness: https://github.com/leanprover/std4/blob/846e9e1d6bb534774d1acd2dc430e70987da3c18/Std/Logic.lean#L749. Adding it to the simp set causes the example at https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/Regression.20in.20simp to slow down.

This PR changes this and fixes the relevant downstream simps. There was also one ocurrence of attribute [simp] FullSubcategory.comp_def FullSubcategory.id_def in in Mathlib.CategoryTheory.Monoidal.Subcategory but that was much easier to fix.

https://github.com/leanprover-community/mathlib4/blob/bc49eb9ba756a233370b4b68bcdedd60402f71ed/Mathlib/CategoryTheory/Monoidal/Subcategory.lean#L118-L119

1fe87718

Diff

@@ -52,7 +52,7 @@ open scoped ZeroObject
 def uniqueHomsetOfZero [HasZeroObject C] (X Y : C) : Unique (X ⟶ Y) := by
   haveI : HasInitial C := HasZeroObject.hasInitial
   apply uniqueHomsetOfInitialIsoTerminal _ X Y
-  refine' ⟨default, (default : ⊤_ C ⟶ 0) ≫ default, _, _⟩ <;> simp
+  refine' ⟨default, (default : ⊤_ C ⟶ 0) ≫ default, _, _⟩ <;> simp [eq_iff_true_of_subsingleton]
 #align category_theory.unique_homset_of_zero CategoryTheory.uniqueHomsetOfZero
 
 attribute [local instance] uniqueHomsetOfZero

70fd9563

refactor: move morphisms in StructuredArrow to a lower universe (#6397)

This PR changes the definition

abbrev fromPUnit (X : C) : Discrete PUnit.{v + 1} ⥤ C :=
  (Functor.const _).obj X

abbrev fromPUnit (X : C) : Discrete PUnit.{w + 1} ⥤ C :=
  (Functor.const _).obj X

and then redefines

def StructuredArrow (S : D) (T : C ⥤ D) :=
  Comma (Functor.fromPUnit S) T

def StructuredArrow (S : D) (T : C ⥤ D) :=
  Comma (Functor.fromPUnit.{0} S) T

The effect of this is that given {C : Type u₁} [Category.{v₁} C] {D : Type u₂} [Category.{v₂} D] (S : D) (T : C ⥤ D), the morphisms of StructuredArrow S T no longer live in max v₁ v₂, but in v₁, as they should. Thus, this PR is basically a better version of #6388.

My guess for why we used to have the larger universe is that back in the day, the universes for limits were much more restricted, so stating the results of Limits/Comma.lean was not possible if the morphisms of StructuredArrow live in v₁. Luckily, by now it is possible to state everything correctly, and this PR adjusts Limits/Comma.lean and Limits/Over.lean accordingly.

7499ee49

Diff

@@ -23,7 +23,7 @@ object and one morphism.
 -/
 
 
-universe v u
+universe w v u
 
 noncomputable section
 
@@ -60,7 +60,7 @@ attribute [local instance] uniqueHomsetOfZero
 /-- A cartesian closed category with a zero object is equivalent to the category with one object and
 one morphism.
 -/
-def equivPUnit [HasZeroObject C] : C ≌ Discrete PUnit :=
+def equivPUnit [HasZeroObject C] : C ≌ Discrete PUnit.{w + 1} :=
   Equivalence.mk (Functor.star C) (Functor.fromPUnit 0)
     (NatIso.ofComponents
       (fun X =>

70fd9563

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) 2020 Bhavik Mehta. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Bhavik Mehta
-
-! This file was ported from Lean 3 source module category_theory.closed.zero
-! leanprover-community/mathlib commit 70fd9563a21e7b963887c9360bd29b2393e6225a
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathlib.CategoryTheory.Closed.Cartesian
 import Mathlib.CategoryTheory.PUnit
 import Mathlib.CategoryTheory.Conj
 import Mathlib.CategoryTheory.Limits.Shapes.ZeroObjects
 
+#align_import category_theory.closed.zero from "leanprover-community/mathlib"@"70fd9563a21e7b963887c9360bd29b2393e6225a"
+
 /-!
 # A cartesian closed category with zero object is trivial

70fd9563

chore: tidy various files (#4997)

95de1dee

Diff

@@ -63,14 +63,14 @@ attribute [local instance] uniqueHomsetOfZero
 /-- A cartesian closed category with a zero object is equivalent to the category with one object and
 one morphism.
 -/
-def equivPunit [HasZeroObject C] : C ≌ Discrete PUnit :=
+def equivPUnit [HasZeroObject C] : C ≌ Discrete PUnit :=
   Equivalence.mk (Functor.star C) (Functor.fromPUnit 0)
     (NatIso.ofComponents
       (fun X =>
         { hom := default
           inv := default })
       fun f => Subsingleton.elim _ _)
-    (Functor.pUnitExt _ _)
-#align category_theory.equiv_punit CategoryTheory.equivPunit
+    (Functor.punitExt _ _)
+#align category_theory.equiv_punit CategoryTheory.equivPUnit
 
 end CategoryTheory

70fd9563

feat: port CategoryTheory.Closed.Zero (#4921)

b31b2034

`category_theory.closed.zero` ⟷ `Mathlib.CategoryTheory.Closed.Zero`

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 3 + 263

category_theory.closed.zero ⟷ Mathlib.CategoryTheory.Closed.Zero

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 3 + 263

`category_theory.closed.zero` ⟷ `Mathlib.CategoryTheory.Closed.Zero`