topology.category.CompHaus.projective | 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

829895f1

(last sync)

Changes in mathlib3port

mathlib3

mathlib3port

f2b757fc

bump to nightly-2024-03-17-08

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

22f01ce4

Diff

@@ -41,7 +41,7 @@ namespace CompHaus
 #print CompHaus.projective_ultrafilter /-
 instance projective_ultrafilter (X : Type _) : Projective (of <| Ultrafilter X)
     where Factors Y Z f g hg := by
-    rw [epi_iff_surjective] at hg 
+    rw [epi_iff_surjective] at hg
     obtain ⟨g', hg'⟩ := hg.has_right_inverse
     let t : X → Y := g' ∘ f ∘ (pure : X → Ultrafilter X)
     let h : Ultrafilter X → Y := Ultrafilter.extend t

f2b757fc

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) 2021 Johan Commelin. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Johan Commelin
 -/
-import Mathbin.Topology.Category.CompHaus.Basic
-import Mathbin.Topology.StoneCech
-import Mathbin.CategoryTheory.Preadditive.Projective
+import Topology.Category.CompHaus.Basic
+import Topology.StoneCech
+import CategoryTheory.Preadditive.Projective
 
 #align_import topology.category.CompHaus.projective from "leanprover-community/mathlib"@"f2b757fc5c341d88741b9c4630b1e8ba973c5726"

f2b757fc

bump to nightly-2023-08-02-01

mathlib commit https://github.com/leanprover-community/mathlib/commit/63721b2c3eba6c325ecf8ae8cca27155a4f6306f

7aca3f15

Diff

@@ -46,7 +46,7 @@ instance projective_ultrafilter (X : Type _) : Projective (of <| Ultrafilter X)
     let t : X → Y := g' ∘ f ∘ (pure : X → Ultrafilter X)
     let h : Ultrafilter X → Y := Ultrafilter.extend t
     have hh : Continuous h := continuous_ultrafilter_extend _
-    use ⟨h, hh⟩
+    use⟨h, hh⟩
     apply faithful.map_injective (forget CompHaus)
     simp only [forget_map_eq_coe, ContinuousMap.coe_mk, coe_comp]
     convert dense_range_pure.equalizer (g.continuous.comp hh) f.continuous _

f2b757fc

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) 2021 Johan Commelin. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Johan Commelin
-
-! This file was ported from Lean 3 source module topology.category.CompHaus.projective
-! leanprover-community/mathlib commit f2b757fc5c341d88741b9c4630b1e8ba973c5726
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathbin.Topology.Category.CompHaus.Basic
 import Mathbin.Topology.StoneCech
 import Mathbin.CategoryTheory.Preadditive.Projective
 
+#align_import topology.category.CompHaus.projective from "leanprover-community/mathlib"@"f2b757fc5c341d88741b9c4630b1e8ba973c5726"
+
 /-!
 # CompHaus has enough projectives

f2b757fc

bump to nightly-2023-06-01-16

mathlib commit https://github.com/leanprover-community/mathlib/commit/cca40788df1b8755d5baf17ab2f27dacc2e17acb

b9c87c70

Diff

@@ -44,7 +44,7 @@ namespace CompHaus
 #print CompHaus.projective_ultrafilter /-
 instance projective_ultrafilter (X : Type _) : Projective (of <| Ultrafilter X)
     where Factors Y Z f g hg := by
-    rw [epi_iff_surjective] at hg
+    rw [epi_iff_surjective] at hg 
     obtain ⟨g', hg'⟩ := hg.has_right_inverse
     let t : X → Y := g' ∘ f ∘ (pure : X → Ultrafilter X)
     let h : Ultrafilter X → Y := Ultrafilter.extend t

f2b757fc

bump to nightly-2023-04-30-02

mathlib commit https://github.com/leanprover-community/mathlib/commit/86d04064ca33ee3d3405fbfc497d494fd2dd4796

648ff713

Diff

@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Johan Commelin
 
 ! This file was ported from Lean 3 source module topology.category.CompHaus.projective
-! leanprover-community/mathlib commit 829895f162a1f29d0133f4b3538f4cd1fb5bffd3
+! leanprover-community/mathlib commit f2b757fc5c341d88741b9c4630b1e8ba973c5726
 ! 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.Preadditive.Projective
 /-!
 # CompHaus has enough projectives
 
+> THIS FILE IS SYNCHRONIZED WITH MATHLIB4.
+> Any changes to this file require a corresponding PR to mathlib4.
+
 In this file we show that `CompHaus` has enough projectives.
 
 ## Main results

829895f1

bump to nightly-2023-04-28-20

mathlib commit https://github.com/leanprover-community/mathlib/commit/fa78268d4d77cb2b2fbc89f0527e2e7807763780

4c74e5fb

Diff

@@ -38,6 +38,7 @@ open CategoryTheory Function
 
 namespace CompHaus
 
+#print CompHaus.projective_ultrafilter /-
 instance projective_ultrafilter (X : Type _) : Projective (of <| Ultrafilter X)
     where Factors Y Z f g hg := by
     rw [epi_iff_surjective] at hg
@@ -51,7 +52,9 @@ instance projective_ultrafilter (X : Type _) : Projective (of <| Ultrafilter X)
     convert dense_range_pure.equalizer (g.continuous.comp hh) f.continuous _
     rw [comp.assoc, ultrafilter_extend_extends, ← comp.assoc, hg'.comp_eq_id, comp.left_id]
 #align CompHaus.projective_ultrafilter CompHaus.projective_ultrafilter
+-/
 
+#print CompHaus.projectivePresentation /-
 /-- For any compact Hausdorff space `X`,
   the natural map `ultrafilter X → X` is a projective presentation. -/
 def projectivePresentation (X : CompHaus) : ProjectivePresentation X
@@ -63,6 +66,7 @@ def projectivePresentation (X : CompHaus) : ProjectivePresentation X
     ConcreteCategory.epi_of_surjective _ fun x =>
       ⟨(pure x : Ultrafilter X), congr_fun (ultrafilter_extend_extends (𝟙 X)) x⟩
 #align CompHaus.projective_presentation CompHaus.projectivePresentation
+-/
 
 instance : EnoughProjectives CompHaus where presentation X := ⟨projectivePresentation X⟩

829895f1

bump to nightly-2023-02-21-16

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

1107b979

Changes in mathlib4

mathlib3

mathlib4

829895f1

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

@@ -46,7 +46,7 @@ instance projective_ultrafilter (X : Type*) : Projective (of <| Ultrafilter X)
     let h : Ultrafilter X → Y := Ultrafilter.extend t
     have hh : Continuous h := continuous_ultrafilter_extend _
     use ⟨h, hh⟩
-    apply Faithful.map_injective (F := forget CompHaus)
+    apply (forget CompHaus).map_injective
     simp only [Functor.map_comp, ContinuousMap.coe_mk, coe_comp]
     convert denseRange_pure.equalizer (g.continuous.comp hh) f.continuous _
     -- Porting note: We need to get the coercions to functions under control.

829895f1

doc(Topology): fix more mathlib3 names in doc comments (#11948)

a437be7c

Diff

@@ -19,7 +19,7 @@ In this file we show that `CompHaus` has enough projectives.
 Let `X` be a compact Hausdorff space.
 
 * `CompHaus.projective_ultrafilter`: the space `Ultrafilter X` is a projective object
-* `CompHaus.projective_presentation`: the natural map `Ultrafilter X → X`
+* `CompHaus.projectivePresentation`: the natural map `Ultrafilter X → X`
   is a projective presentation
 
 ## Reference

829895f1

refactor(*): abbreviation for non-dependent FunLike (#9833)

This follows up from #9785, which renamed FunLike to DFunLike, by introducing a new abbreviation FunLike F α β := DFunLike F α (fun _ => β), to make the non-dependent use of FunLike easier.

I searched for the pattern DFunLike.*fun and DFunLike.*λ in all files to replace expressions of the form DFunLike F α (fun _ => β) with FunLike F α β. I did this everywhere except for extends clauses for two reasons: it would conflict with #8386, and more importantly extends must directly refer to a structure with no unfolding of defs or abbrevs.

54792e9e

Diff

@@ -35,7 +35,7 @@ open CategoryTheory Function
 
 namespace CompHaus
 
-attribute [local instance] ConcreteCategory.instDFunLike
+attribute [local instance] ConcreteCategory.instFunLike
 
 instance projective_ultrafilter (X : Type*) : Projective (of <| Ultrafilter X)
     where

829895f1

chore(*): rename FunLike to DFunLike (#9785)

This prepares for the introduction of a non-dependent synonym of FunLike, which helps a lot with keeping #8386 readable.

This is entirely search-and-replace in 680197f combined with manual fixes in 4145626, e900597 and b8428f8. The commands that generated this change:

sed -i 's/\bFunLike\b/DFunLike/g' {Archive,Counterexamples,Mathlib,test}/**/*.lean
sed -i 's/\btoFunLike\b/toDFunLike/g' {Archive,Counterexamples,Mathlib,test}/**/*.lean
sed -i 's/import Mathlib.Data.DFunLike/import Mathlib.Data.FunLike/g' {Archive,Counterexamples,Mathlib,test}/**/*.lean
sed -i 's/\bHom_FunLike\b/Hom_DFunLike/g' {Archive,Counterexamples,Mathlib,test}/**/*.lean     
sed -i 's/\binstFunLike\b/instDFunLike/g' {Archive,Counterexamples,Mathlib,test}/**/*.lean
sed -i 's/\bfunLike\b/instDFunLike/g' {Archive,Counterexamples,Mathlib,test}/**/*.lean
sed -i 's/\btoo many metavariables to apply `fun_like.has_coe_to_fun`/too many metavariables to apply `DFunLike.hasCoeToFun`/g' {Archive,Counterexamples,Mathlib,test}/**/*.lean

Co-authored-by: Anne Baanen <Vierkantor@users.noreply.github.com>

82656743

Diff

@@ -35,7 +35,7 @@ open CategoryTheory Function
 
 namespace CompHaus
 
-attribute [local instance] ConcreteCategory.funLike
+attribute [local instance] ConcreteCategory.instDFunLike
 
 instance projective_ultrafilter (X : Type*) : Projective (of <| Ultrafilter X)
     where

829895f1

chore(Function): rename some lemmas (#9738)

Merge Function.left_id and Function.comp.left_id into Function.id_comp.
Merge Function.right_id and Function.comp.right_id into Function.comp_id.
Merge Function.comp_const_right and Function.comp_const into Function.comp_const, use explicit arguments.
Move Function.const_comp to Mathlib.Init.Function, use explicit arguments.

87c10369

Diff

@@ -54,7 +54,7 @@ instance projective_ultrafilter (X : Type*) : Projective (of <| Ultrafilter X)
     let g'' : ContinuousMap Y Z := g
     have : g'' ∘ g' = id := hg'.comp_eq_id
     -- This used to be `rw`, but we need `erw` after leanprover/lean4#2644
-    erw [comp.assoc, ultrafilter_extend_extends, ← comp.assoc, this, comp.left_id]
+    erw [comp.assoc, ultrafilter_extend_extends, ← comp.assoc, this, id_comp]
 set_option linter.uppercaseLean3 false in
 #align CompHaus.projective_ultrafilter CompHaus.projective_ultrafilter

829895f1

Revert "chore: revert #7703 (#7710)"

This reverts commit f3695eb2.

ab56fa28

Diff

@@ -53,7 +53,8 @@ instance projective_ultrafilter (X : Type*) : Projective (of <| Ultrafilter X)
     -- The next two lines should not be needed.
     let g'' : ContinuousMap Y Z := g
     have : g'' ∘ g' = id := hg'.comp_eq_id
-    rw [comp.assoc, ultrafilter_extend_extends, ← comp.assoc, this, comp.left_id]
+    -- This used to be `rw`, but we need `erw` after leanprover/lean4#2644
+    erw [comp.assoc, ultrafilter_extend_extends, ← comp.assoc, this, comp.left_id]
 set_option linter.uppercaseLean3 false in
 #align CompHaus.projective_ultrafilter CompHaus.projective_ultrafilter

829895f1

chore: revert #7703 (#7710)

This reverts commit 26eb2b0a.

f3695eb2

Diff

@@ -53,8 +53,7 @@ instance projective_ultrafilter (X : Type*) : Projective (of <| Ultrafilter X)
     -- The next two lines should not be needed.
     let g'' : ContinuousMap Y Z := g
     have : g'' ∘ g' = id := hg'.comp_eq_id
-    -- This used to be `rw`, but we need `erw` after leanprover/lean4#2644
-    erw [comp.assoc, ultrafilter_extend_extends, ← comp.assoc, this, comp.left_id]
+    rw [comp.assoc, ultrafilter_extend_extends, ← comp.assoc, this, comp.left_id]
 set_option linter.uppercaseLean3 false in
 #align CompHaus.projective_ultrafilter CompHaus.projective_ultrafilter

829895f1

chore: bump toolchain to v4.2.0-rc2 (#7703)

This includes all the changes from #7606.

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

26eb2b0a

Diff

@@ -53,7 +53,8 @@ instance projective_ultrafilter (X : Type*) : Projective (of <| Ultrafilter X)
     -- The next two lines should not be needed.
     let g'' : ContinuousMap Y Z := g
     have : g'' ∘ g' = id := hg'.comp_eq_id
-    rw [comp.assoc, ultrafilter_extend_extends, ← comp.assoc, this, comp.left_id]
+    -- This used to be `rw`, but we need `erw` after leanprover/lean4#2644
+    erw [comp.assoc, ultrafilter_extend_extends, ← comp.assoc, this, comp.left_id]
 set_option linter.uppercaseLean3 false in
 #align CompHaus.projective_ultrafilter CompHaus.projective_ultrafilter

829895f1

chore: banish Type _ and Sort _ (#6499)

We remove all possible occurences of Type _ and Sort _ in favor of Type* and Sort*.

This has nice performance benefits.

32de3f67

Diff

@@ -37,7 +37,7 @@ namespace CompHaus
 
 attribute [local instance] ConcreteCategory.funLike
 
-instance projective_ultrafilter (X : Type _) : Projective (of <| Ultrafilter X)
+instance projective_ultrafilter (X : Type*) : Projective (of <| Ultrafilter X)
     where
   factors {Y Z} f g hg := by
     rw [epi_iff_surjective] at hg

829895f1

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) 2021 Johan Commelin. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Johan Commelin
-
-! This file was ported from Lean 3 source module topology.category.CompHaus.projective
-! leanprover-community/mathlib commit 829895f162a1f29d0133f4b3538f4cd1fb5bffd3
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathlib.Topology.Category.CompHaus.Basic
 import Mathlib.Topology.StoneCech
 import Mathlib.CategoryTheory.Preadditive.Projective
 
+#align_import topology.category.CompHaus.projective from "leanprover-community/mathlib"@"829895f162a1f29d0133f4b3538f4cd1fb5bffd3"
+
 /-!
 # CompHaus has enough projectives

829895f1

feat: change ConcreteCategory.hasCoeToFun to FunLike (#4693)

b7cba33a

Diff

@@ -38,7 +38,7 @@ open CategoryTheory Function
 
 namespace CompHaus
 
-attribute [local instance] ConcreteCategory.hasCoeToFun
+attribute [local instance] ConcreteCategory.funLike
 
 instance projective_ultrafilter (X : Type _) : Projective (of <| Ultrafilter X)
     where
@@ -57,7 +57,6 @@ instance projective_ultrafilter (X : Type _) : Projective (of <| Ultrafilter X)
     let g'' : ContinuousMap Y Z := g
     have : g'' ∘ g' = id := hg'.comp_eq_id
     rw [comp.assoc, ultrafilter_extend_extends, ← comp.assoc, this, comp.left_id]
-    rfl
 set_option linter.uppercaseLean3 false in
 #align CompHaus.projective_ultrafilter CompHaus.projective_ultrafilter

829895f1

chore: refactor of concrete categories (#3900)

I think the ports

https://github.com/leanprover-community/mathlib4/pull/2902 (MonCat)
https://github.com/leanprover-community/mathlib4/pull/3036 (GroupCat)
https://github.com/leanprover-community/mathlib4/pull/3260 (ModuleCat)

didn't quite get things right, and also have some variation between them. This PR tries to straighten things out.

Major changes:

Have the coercion to type be via X.\a, and put attribute @[coe] on this.

Make sure the coercion from morphisms to functions means that simp lemmas about the underlying bundled morphisms apply directly.

This means we drop lemmas like

lemma Hom.map_mul {X Y : MonCat} (f : X ⟶ Y) (x y : X) : ((forget MonCat).map f) (x * y) = f x * f y

But at the expense of adding lemmas like

lemma coe_comp {X Y Z : MonCat} {f : X ⟶ Y} {g : Y ⟶ Z} : (f ≫ g : X → Z) = g ∘ f := rfl

Overall I'm pretty happy, and it allows me to unstick the long stuck https://github.com/leanprover-community/mathlib4/pull/3105.

This is not everything I want to do to refactor these files, but once I was satisfied that I can move forward with RingCat, I want to get this merged so we can unblock porting progress. I'll promise to come back to this soon! :-)

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

237c33e0

Diff

@@ -50,7 +50,7 @@ instance projective_ultrafilter (X : Type _) : Projective (of <| Ultrafilter X)
     have hh : Continuous h := continuous_ultrafilter_extend _
     use ⟨h, hh⟩
     apply Faithful.map_injective (F := forget CompHaus)
-    simp only [Functor.map_comp, forget_map_eq_coe, ContinuousMap.coe_mk, coe_comp]
+    simp only [Functor.map_comp, ContinuousMap.coe_mk, coe_comp]
     convert denseRange_pure.equalizer (g.continuous.comp hh) f.continuous _
     -- Porting note: We need to get the coercions to functions under control.
     -- The next two lines should not be needed.

829895f1

feat: Port Topology.Category.CompHaus.Projective (#3715)

ff03f494

`topology.category.CompHaus.projective` ⟷ `Mathlib.Topology.Category.CompHaus.Projective`

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 10 + 758

topology.category.CompHaus.projective ⟷ Mathlib.Topology.Category.CompHaus.Projective

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 10 + 758

`topology.category.CompHaus.projective` ⟷ `Mathlib.Topology.Category.CompHaus.Projective`