topology.homotopy.contractible | 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

16728b30

(last sync)

Changes in mathlib3port

mathlib3

mathlib3port

dbdf71ce

bump to nightly-2024-02-05-08

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

516c6ec2

Diff

@@ -58,7 +58,7 @@ open ContinuousMap
 open scoped ContinuousMap
 
 #print ContractibleSpace /-
-/- ./././Mathport/Syntax/Translate/Command.lean:404:30: infer kinds are unsupported in Lean 4: #[`hequiv_unit] [] -/
+/- ./././Mathport/Syntax/Translate/Command.lean:400:30: infer kinds are unsupported in Lean 4: #[`hequiv_unit] [] -/
 /-- A contractible space is one that is homotopy equivalent to `unit`. -/
 class ContractibleSpace (X : Type _) [TopologicalSpace X] : Prop where
   hequiv_unit : Nonempty (X ≃ₕ Unit)

dbdf71ce

bump to nightly-2023-12-23-06

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

b8c74971

Diff

@@ -58,7 +58,7 @@ open ContinuousMap
 open scoped ContinuousMap
 
 #print ContractibleSpace /-
-/- ./././Mathport/Syntax/Translate/Command.lean:394:30: infer kinds are unsupported in Lean 4: #[`hequiv_unit] [] -/
+/- ./././Mathport/Syntax/Translate/Command.lean:404:30: infer kinds are unsupported in Lean 4: #[`hequiv_unit] [] -/
 /-- A contractible space is one that is homotopy equivalent to `unit`. -/
 class ContractibleSpace (X : Type _) [TopologicalSpace X] : Prop where
   hequiv_unit : Nonempty (X ≃ₕ Unit)

dbdf71ce

bump to nightly-2023-09-24-06

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

5655435f

Diff

@@ -3,8 +3,8 @@ Copyright (c) 2022 Praneeth Kolichala. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Praneeth Kolichala
 -/
-import Mathbin.Topology.Homotopy.Path
-import Mathbin.Topology.Homotopy.Equiv
+import Topology.Homotopy.Path
+import Topology.Homotopy.Equiv
 
 #align_import topology.homotopy.contractible from "leanprover-community/mathlib"@"dbdf71cee7bb20367cb7e37279c08b0c218cf967"
 
@@ -58,7 +58,7 @@ open ContinuousMap
 open scoped ContinuousMap
 
 #print ContractibleSpace /-
-/- ./././Mathport/Syntax/Translate/Command.lean:393:30: infer kinds are unsupported in Lean 4: #[`hequiv_unit] [] -/
+/- ./././Mathport/Syntax/Translate/Command.lean:394:30: infer kinds are unsupported in Lean 4: #[`hequiv_unit] [] -/
 /-- A contractible space is one that is homotopy equivalent to `unit`. -/
 class ContractibleSpace (X : Type _) [TopologicalSpace X] : Prop where
   hequiv_unit : Nonempty (X ≃ₕ Unit)

dbdf71ce

bump to nightly-2023-07-20-09

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

9c56d0dd

Diff

@@ -2,15 +2,12 @@
 Copyright (c) 2022 Praneeth Kolichala. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Praneeth Kolichala
-
-! This file was ported from Lean 3 source module topology.homotopy.contractible
-! leanprover-community/mathlib commit dbdf71cee7bb20367cb7e37279c08b0c218cf967
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathbin.Topology.Homotopy.Path
 import Mathbin.Topology.Homotopy.Equiv
 
+#align_import topology.homotopy.contractible from "leanprover-community/mathlib"@"dbdf71cee7bb20367cb7e37279c08b0c218cf967"
+
 /-!
 # Contractible spaces

dbdf71ce

bump to nightly-2023-06-13-21

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

829520ac

Diff

@@ -34,19 +34,25 @@ def Nullhomotopic (f : C(X, Y)) : Prop :=
 #align continuous_map.nullhomotopic ContinuousMap.Nullhomotopic
 -/
 
+#print ContinuousMap.nullhomotopic_of_constant /-
 theorem nullhomotopic_of_constant (y : Y) : Nullhomotopic (ContinuousMap.const X y) :=
   ⟨y, by rfl⟩
 #align continuous_map.nullhomotopic_of_constant ContinuousMap.nullhomotopic_of_constant
+-/
 
+#print ContinuousMap.Nullhomotopic.comp_right /-
 theorem Nullhomotopic.comp_right {f : C(X, Y)} (hf : f.Nullhomotopic) (g : C(Y, Z)) :
     (g.comp f).Nullhomotopic := by cases' hf with y hy; use g y;
   exact homotopic.hcomp hy (homotopic.refl g)
 #align continuous_map.nullhomotopic.comp_right ContinuousMap.Nullhomotopic.comp_right
+-/
 
+#print ContinuousMap.Nullhomotopic.comp_left /-
 theorem Nullhomotopic.comp_left {f : C(Y, Z)} (hf : f.Nullhomotopic) (g : C(X, Y)) :
     (f.comp g).Nullhomotopic := by cases' hf with y hy; use y;
   exact homotopic.hcomp (homotopic.refl g) hy
 #align continuous_map.nullhomotopic.comp_left ContinuousMap.Nullhomotopic.comp_left
+-/
 
 end ContinuousMap
 
@@ -55,7 +61,7 @@ open ContinuousMap
 open scoped ContinuousMap
 
 #print ContractibleSpace /-
-/- ./././Mathport/Syntax/Translate/Command.lean:394:30: infer kinds are unsupported in Lean 4: #[`hequiv_unit] [] -/
+/- ./././Mathport/Syntax/Translate/Command.lean:393:30: infer kinds are unsupported in Lean 4: #[`hequiv_unit] [] -/
 /-- A contractible space is one that is homotopy equivalent to `unit`. -/
 class ContractibleSpace (X : Type _) [TopologicalSpace X] : Prop where
   hequiv_unit : Nonempty (X ≃ₕ Unit)
@@ -97,10 +103,12 @@ protected theorem ContinuousMap.HomotopyEquiv.contractibleSpace [ContractibleSpa
 #align continuous_map.homotopy_equiv.contractible_space ContinuousMap.HomotopyEquiv.contractibleSpace
 -/
 
+#print ContinuousMap.HomotopyEquiv.contractibleSpace_iff /-
 protected theorem ContinuousMap.HomotopyEquiv.contractibleSpace_iff (e : X ≃ₕ Y) :
     ContractibleSpace X ↔ ContractibleSpace Y :=
   ⟨by intro h; exact e.symm.contractible_space, by intro h; exact e.contractible_space⟩
 #align continuous_map.homotopy_equiv.contractible_space_iff ContinuousMap.HomotopyEquiv.contractibleSpace_iff
+-/
 
 #print Homeomorph.contractibleSpace /-
 protected theorem Homeomorph.contractibleSpace [ContractibleSpace Y] (e : X ≃ₜ Y) :
@@ -109,10 +117,12 @@ protected theorem Homeomorph.contractibleSpace [ContractibleSpace Y] (e : X ≃
 #align homeomorph.contractible_space Homeomorph.contractibleSpace
 -/
 
+#print Homeomorph.contractibleSpace_iff /-
 protected theorem Homeomorph.contractibleSpace_iff (e : X ≃ₜ Y) :
     ContractibleSpace X ↔ ContractibleSpace Y :=
   e.toHomotopyEquiv.contractibleSpace_iff
 #align homeomorph.contractible_space_iff Homeomorph.contractibleSpace_iff
+-/
 
 namespace ContractibleSpace

dbdf71ce

bump to nightly-2023-06-04-18

mathlib commit https://github.com/leanprover-community/mathlib/commit/5f25c089cb34db4db112556f23c50d12da81b297

3fb4268b

Diff

@@ -55,7 +55,7 @@ open ContinuousMap
 open scoped ContinuousMap
 
 #print ContractibleSpace /-
-/- ./././Mathport/Syntax/Translate/Command.lean:393:30: infer kinds are unsupported in Lean 4: #[`hequiv_unit] [] -/
+/- ./././Mathport/Syntax/Translate/Command.lean:394:30: infer kinds are unsupported in Lean 4: #[`hequiv_unit] [] -/
 /-- A contractible space is one that is homotopy equivalent to `unit`. -/
 class ContractibleSpace (X : Type _) [TopologicalSpace X] : Prop where
   hequiv_unit : Nonempty (X ≃ₕ Unit)

dbdf71ce

bump to nightly-2023-06-01-16

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

b9c87c70

Diff

@@ -77,7 +77,7 @@ theorem id_nullhomotopic (X : Type _) [TopologicalSpace X] [ContractibleSpace X]
 theorem contractible_iff_id_nullhomotopic (Y : Type _) [TopologicalSpace Y] :
     ContractibleSpace Y ↔ (ContinuousMap.id Y).Nullhomotopic :=
   by
-  constructor; · intro ; apply id_nullhomotopic
+  constructor; · intro; apply id_nullhomotopic
   rintro ⟨p, h⟩
   refine_struct
     {

dbdf71ce

bump to nightly-2023-05-28-18

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

8d353152

Diff

@@ -52,7 +52,7 @@ end ContinuousMap
 
 open ContinuousMap
 
-open ContinuousMap
+open scoped ContinuousMap
 
 #print ContractibleSpace /-
 /- ./././Mathport/Syntax/Translate/Command.lean:393:30: infer kinds are unsupported in Lean 4: #[`hequiv_unit] [] -/

dbdf71ce

bump to nightly-2023-05-28-06

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

ba5d8b97

Diff

@@ -34,33 +34,15 @@ def Nullhomotopic (f : C(X, Y)) : Prop :=
 #align continuous_map.nullhomotopic ContinuousMap.Nullhomotopic
 -/
 
-/- warning: continuous_map.nullhomotopic_of_constant -> ContinuousMap.nullhomotopic_of_constant is a dubious translation:
-lean 3 declaration is
-  forall {X : Type.{u1}} {Y : Type.{u2}} [_inst_1 : TopologicalSpace.{u1} X] [_inst_2 : TopologicalSpace.{u2} Y] (y : Y), ContinuousMap.Nullhomotopic.{u1, u2} X Y _inst_1 _inst_2 (ContinuousMap.const.{u1, u2} X Y _inst_1 _inst_2 y)
-but is expected to have type
-  forall {X : Type.{u2}} {Y : Type.{u1}} [_inst_1 : TopologicalSpace.{u2} X] [_inst_2 : TopologicalSpace.{u1} Y] (y : Y), ContinuousMap.Nullhomotopic.{u2, u1} X Y _inst_1 _inst_2 (ContinuousMap.const.{u2, u1} X Y _inst_1 _inst_2 y)
-Case conversion may be inaccurate. Consider using '#align continuous_map.nullhomotopic_of_constant ContinuousMap.nullhomotopic_of_constantₓ'. -/
 theorem nullhomotopic_of_constant (y : Y) : Nullhomotopic (ContinuousMap.const X y) :=
   ⟨y, by rfl⟩
 #align continuous_map.nullhomotopic_of_constant ContinuousMap.nullhomotopic_of_constant
 
-/- warning: continuous_map.nullhomotopic.comp_right -> ContinuousMap.Nullhomotopic.comp_right is a dubious translation:
-lean 3 declaration is
-  forall {X : Type.{u1}} {Y : Type.{u2}} {Z : Type.{u3}} [_inst_1 : TopologicalSpace.{u1} X] [_inst_2 : TopologicalSpace.{u2} Y] [_inst_3 : TopologicalSpace.{u3} Z] {f : ContinuousMap.{u1, u2} X Y _inst_1 _inst_2}, (ContinuousMap.Nullhomotopic.{u1, u2} X Y _inst_1 _inst_2 f) -> (forall (g : ContinuousMap.{u2, u3} Y Z _inst_2 _inst_3), ContinuousMap.Nullhomotopic.{u1, u3} X Z _inst_1 _inst_3 (ContinuousMap.comp.{u1, u2, u3} X Y Z _inst_1 _inst_2 _inst_3 g f))
-but is expected to have type
-  forall {X : Type.{u3}} {Y : Type.{u2}} {Z : Type.{u1}} [_inst_1 : TopologicalSpace.{u3} X] [_inst_2 : TopologicalSpace.{u2} Y] [_inst_3 : TopologicalSpace.{u1} Z] {f : ContinuousMap.{u3, u2} X Y _inst_1 _inst_2}, (ContinuousMap.Nullhomotopic.{u3, u2} X Y _inst_1 _inst_2 f) -> (forall (g : ContinuousMap.{u2, u1} Y Z _inst_2 _inst_3), ContinuousMap.Nullhomotopic.{u3, u1} X Z _inst_1 _inst_3 (ContinuousMap.comp.{u3, u2, u1} X Y Z _inst_1 _inst_2 _inst_3 g f))
-Case conversion may be inaccurate. Consider using '#align continuous_map.nullhomotopic.comp_right ContinuousMap.Nullhomotopic.comp_rightₓ'. -/
 theorem Nullhomotopic.comp_right {f : C(X, Y)} (hf : f.Nullhomotopic) (g : C(Y, Z)) :
     (g.comp f).Nullhomotopic := by cases' hf with y hy; use g y;
   exact homotopic.hcomp hy (homotopic.refl g)
 #align continuous_map.nullhomotopic.comp_right ContinuousMap.Nullhomotopic.comp_right
 
-/- warning: continuous_map.nullhomotopic.comp_left -> ContinuousMap.Nullhomotopic.comp_left is a dubious translation:
-lean 3 declaration is
-  forall {X : Type.{u1}} {Y : Type.{u2}} {Z : Type.{u3}} [_inst_1 : TopologicalSpace.{u1} X] [_inst_2 : TopologicalSpace.{u2} Y] [_inst_3 : TopologicalSpace.{u3} Z] {f : ContinuousMap.{u2, u3} Y Z _inst_2 _inst_3}, (ContinuousMap.Nullhomotopic.{u2, u3} Y Z _inst_2 _inst_3 f) -> (forall (g : ContinuousMap.{u1, u2} X Y _inst_1 _inst_2), ContinuousMap.Nullhomotopic.{u1, u3} X Z _inst_1 _inst_3 (ContinuousMap.comp.{u1, u2, u3} X Y Z _inst_1 _inst_2 _inst_3 f g))
-but is expected to have type
-  forall {X : Type.{u1}} {Y : Type.{u3}} {Z : Type.{u2}} [_inst_1 : TopologicalSpace.{u1} X] [_inst_2 : TopologicalSpace.{u3} Y] [_inst_3 : TopologicalSpace.{u2} Z] {f : ContinuousMap.{u3, u2} Y Z _inst_2 _inst_3}, (ContinuousMap.Nullhomotopic.{u3, u2} Y Z _inst_2 _inst_3 f) -> (forall (g : ContinuousMap.{u1, u3} X Y _inst_1 _inst_2), ContinuousMap.Nullhomotopic.{u1, u2} X Z _inst_1 _inst_3 (ContinuousMap.comp.{u1, u3, u2} X Y Z _inst_1 _inst_2 _inst_3 f g))
-Case conversion may be inaccurate. Consider using '#align continuous_map.nullhomotopic.comp_left ContinuousMap.Nullhomotopic.comp_leftₓ'. -/
 theorem Nullhomotopic.comp_left {f : C(Y, Z)} (hf : f.Nullhomotopic) (g : C(X, Y)) :
     (f.comp g).Nullhomotopic := by cases' hf with y hy; use y;
   exact homotopic.hcomp (homotopic.refl g) hy
@@ -115,12 +97,6 @@ protected theorem ContinuousMap.HomotopyEquiv.contractibleSpace [ContractibleSpa
 #align continuous_map.homotopy_equiv.contractible_space ContinuousMap.HomotopyEquiv.contractibleSpace
 -/
 
-/- warning: continuous_map.homotopy_equiv.contractible_space_iff -> ContinuousMap.HomotopyEquiv.contractibleSpace_iff is a dubious translation:
-lean 3 declaration is
-  forall {X : Type.{u1}} {Y : Type.{u2}} [_inst_1 : TopologicalSpace.{u1} X] [_inst_2 : TopologicalSpace.{u2} Y], (ContinuousMap.HomotopyEquiv.{u1, u2} X Y _inst_1 _inst_2) -> (Iff (ContractibleSpace.{u1} X _inst_1) (ContractibleSpace.{u2} Y _inst_2))
-but is expected to have type
-  forall {X : Type.{u2}} {Y : Type.{u1}} [_inst_1 : TopologicalSpace.{u2} X] [_inst_2 : TopologicalSpace.{u1} Y], (ContinuousMap.HomotopyEquiv.{u2, u1} X Y _inst_1 _inst_2) -> (Iff (ContractibleSpace.{u2} X _inst_1) (ContractibleSpace.{u1} Y _inst_2))
-Case conversion may be inaccurate. Consider using '#align continuous_map.homotopy_equiv.contractible_space_iff ContinuousMap.HomotopyEquiv.contractibleSpace_iffₓ'. -/
 protected theorem ContinuousMap.HomotopyEquiv.contractibleSpace_iff (e : X ≃ₕ Y) :
     ContractibleSpace X ↔ ContractibleSpace Y :=
   ⟨by intro h; exact e.symm.contractible_space, by intro h; exact e.contractible_space⟩
@@ -133,12 +109,6 @@ protected theorem Homeomorph.contractibleSpace [ContractibleSpace Y] (e : X ≃
 #align homeomorph.contractible_space Homeomorph.contractibleSpace
 -/
 
-/- warning: homeomorph.contractible_space_iff -> Homeomorph.contractibleSpace_iff is a dubious translation:
-lean 3 declaration is
-  forall {X : Type.{u1}} {Y : Type.{u2}} [_inst_1 : TopologicalSpace.{u1} X] [_inst_2 : TopologicalSpace.{u2} Y], (Homeomorph.{u1, u2} X Y _inst_1 _inst_2) -> (Iff (ContractibleSpace.{u1} X _inst_1) (ContractibleSpace.{u2} Y _inst_2))
-but is expected to have type
-  forall {X : Type.{u2}} {Y : Type.{u1}} [_inst_1 : TopologicalSpace.{u2} X] [_inst_2 : TopologicalSpace.{u1} Y], (Homeomorph.{u2, u1} X Y _inst_1 _inst_2) -> (Iff (ContractibleSpace.{u2} X _inst_1) (ContractibleSpace.{u1} Y _inst_2))
-Case conversion may be inaccurate. Consider using '#align homeomorph.contractible_space_iff Homeomorph.contractibleSpace_iffₓ'. -/
 protected theorem Homeomorph.contractibleSpace_iff (e : X ≃ₜ Y) :
     ContractibleSpace X ↔ ContractibleSpace Y :=
   e.toHomotopyEquiv.contractibleSpace_iff

dbdf71ce

bump to nightly-2023-05-28-04

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

6797a637

Diff

@@ -51,9 +51,7 @@ but is expected to have type
   forall {X : Type.{u3}} {Y : Type.{u2}} {Z : Type.{u1}} [_inst_1 : TopologicalSpace.{u3} X] [_inst_2 : TopologicalSpace.{u2} Y] [_inst_3 : TopologicalSpace.{u1} Z] {f : ContinuousMap.{u3, u2} X Y _inst_1 _inst_2}, (ContinuousMap.Nullhomotopic.{u3, u2} X Y _inst_1 _inst_2 f) -> (forall (g : ContinuousMap.{u2, u1} Y Z _inst_2 _inst_3), ContinuousMap.Nullhomotopic.{u3, u1} X Z _inst_1 _inst_3 (ContinuousMap.comp.{u3, u2, u1} X Y Z _inst_1 _inst_2 _inst_3 g f))
 Case conversion may be inaccurate. Consider using '#align continuous_map.nullhomotopic.comp_right ContinuousMap.Nullhomotopic.comp_rightₓ'. -/
 theorem Nullhomotopic.comp_right {f : C(X, Y)} (hf : f.Nullhomotopic) (g : C(Y, Z)) :
-    (g.comp f).Nullhomotopic := by
-  cases' hf with y hy
-  use g y
+    (g.comp f).Nullhomotopic := by cases' hf with y hy; use g y;
   exact homotopic.hcomp hy (homotopic.refl g)
 #align continuous_map.nullhomotopic.comp_right ContinuousMap.Nullhomotopic.comp_right
 
@@ -64,9 +62,7 @@ but is expected to have type
   forall {X : Type.{u1}} {Y : Type.{u3}} {Z : Type.{u2}} [_inst_1 : TopologicalSpace.{u1} X] [_inst_2 : TopologicalSpace.{u3} Y] [_inst_3 : TopologicalSpace.{u2} Z] {f : ContinuousMap.{u3, u2} Y Z _inst_2 _inst_3}, (ContinuousMap.Nullhomotopic.{u3, u2} Y Z _inst_2 _inst_3 f) -> (forall (g : ContinuousMap.{u1, u3} X Y _inst_1 _inst_2), ContinuousMap.Nullhomotopic.{u1, u2} X Z _inst_1 _inst_3 (ContinuousMap.comp.{u1, u3, u2} X Y Z _inst_1 _inst_2 _inst_3 f g))
 Case conversion may be inaccurate. Consider using '#align continuous_map.nullhomotopic.comp_left ContinuousMap.Nullhomotopic.comp_leftₓ'. -/
 theorem Nullhomotopic.comp_left {f : C(Y, Z)} (hf : f.Nullhomotopic) (g : C(X, Y)) :
-    (f.comp g).Nullhomotopic := by
-  cases' hf with y hy
-  use y
+    (f.comp g).Nullhomotopic := by cases' hf with y hy; use y;
   exact homotopic.hcomp (homotopic.refl g) hy
 #align continuous_map.nullhomotopic.comp_left ContinuousMap.Nullhomotopic.comp_left
 
@@ -99,18 +95,14 @@ theorem id_nullhomotopic (X : Type _) [TopologicalSpace X] [ContractibleSpace X]
 theorem contractible_iff_id_nullhomotopic (Y : Type _) [TopologicalSpace Y] :
     ContractibleSpace Y ↔ (ContinuousMap.id Y).Nullhomotopic :=
   by
-  constructor;
-  · intro
-    apply id_nullhomotopic
+  constructor; · intro ; apply id_nullhomotopic
   rintro ⟨p, h⟩
   refine_struct
     {
       hequiv_unit :=
         ⟨{  toFun := ContinuousMap.const _ ()
             invFun := ContinuousMap.const _ p }⟩ }
-  · exact h.symm;
-  · convert homotopic.refl (ContinuousMap.id Unit)
-    ext
+  · exact h.symm; · convert homotopic.refl (ContinuousMap.id Unit); ext
 #align contractible_iff_id_nullhomotopic contractible_iff_id_nullhomotopic
 -/
 
@@ -131,11 +123,7 @@ but is expected to have type
 Case conversion may be inaccurate. Consider using '#align continuous_map.homotopy_equiv.contractible_space_iff ContinuousMap.HomotopyEquiv.contractibleSpace_iffₓ'. -/
 protected theorem ContinuousMap.HomotopyEquiv.contractibleSpace_iff (e : X ≃ₕ Y) :
     ContractibleSpace X ↔ ContractibleSpace Y :=
-  ⟨by
-    intro h
-    exact e.symm.contractible_space, by
-    intro h
-    exact e.contractible_space⟩
+  ⟨by intro h; exact e.symm.contractible_space, by intro h; exact e.contractible_space⟩
 #align continuous_map.homotopy_equiv.contractible_space_iff ContinuousMap.HomotopyEquiv.contractibleSpace_iff
 
 #print Homeomorph.contractibleSpace /-

dbdf71ce

bump to nightly-2023-05-16-03

mathlib commit https://github.com/leanprover-community/mathlib/commit/0b9eaaa7686280fad8cce467f5c3c57ee6ce77f8

4c01fe25

Diff

@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Praneeth Kolichala
 
 ! This file was ported from Lean 3 source module topology.homotopy.contractible
-! leanprover-community/mathlib commit 16728b3064a1751103e1dc2815ed8d00560e0d87
+! leanprover-community/mathlib commit dbdf71cee7bb20367cb7e37279c08b0c218cf967
 ! Please do not edit these lines, except to modify the commit id
 ! if you have ported upstream changes.
 -/
@@ -14,6 +14,9 @@ import Mathbin.Topology.Homotopy.Equiv
 /-!
 # Contractible spaces
 
+> THIS FILE IS SYNCHRONIZED WITH MATHLIB4.
+> Any changes to this file require a corresponding PR to mathlib4.
+
 In this file, we define `contractible_space`, a space that is homotopy equivalent to `unit`.
 -/

16728b30

bump to nightly-2023-05-14-12

mathlib commit https://github.com/leanprover-community/mathlib/commit/e3fb84046afd187b710170887195d50bada934ee

4148bec7

Diff

@@ -24,15 +24,29 @@ namespace ContinuousMap
 
 variable {X Y Z : Type _} [TopologicalSpace X] [TopologicalSpace Y] [TopologicalSpace Z]
 
+#print ContinuousMap.Nullhomotopic /-
 /-- A map is nullhomotopic if it is homotopic to a constant map. -/
 def Nullhomotopic (f : C(X, Y)) : Prop :=
   ∃ y : Y, Homotopic f (ContinuousMap.const _ y)
 #align continuous_map.nullhomotopic ContinuousMap.Nullhomotopic
+-/
 
+/- warning: continuous_map.nullhomotopic_of_constant -> ContinuousMap.nullhomotopic_of_constant is a dubious translation:
+lean 3 declaration is
+  forall {X : Type.{u1}} {Y : Type.{u2}} [_inst_1 : TopologicalSpace.{u1} X] [_inst_2 : TopologicalSpace.{u2} Y] (y : Y), ContinuousMap.Nullhomotopic.{u1, u2} X Y _inst_1 _inst_2 (ContinuousMap.const.{u1, u2} X Y _inst_1 _inst_2 y)
+but is expected to have type
+  forall {X : Type.{u2}} {Y : Type.{u1}} [_inst_1 : TopologicalSpace.{u2} X] [_inst_2 : TopologicalSpace.{u1} Y] (y : Y), ContinuousMap.Nullhomotopic.{u2, u1} X Y _inst_1 _inst_2 (ContinuousMap.const.{u2, u1} X Y _inst_1 _inst_2 y)
+Case conversion may be inaccurate. Consider using '#align continuous_map.nullhomotopic_of_constant ContinuousMap.nullhomotopic_of_constantₓ'. -/
 theorem nullhomotopic_of_constant (y : Y) : Nullhomotopic (ContinuousMap.const X y) :=
   ⟨y, by rfl⟩
 #align continuous_map.nullhomotopic_of_constant ContinuousMap.nullhomotopic_of_constant
 
+/- warning: continuous_map.nullhomotopic.comp_right -> ContinuousMap.Nullhomotopic.comp_right is a dubious translation:
+lean 3 declaration is
+  forall {X : Type.{u1}} {Y : Type.{u2}} {Z : Type.{u3}} [_inst_1 : TopologicalSpace.{u1} X] [_inst_2 : TopologicalSpace.{u2} Y] [_inst_3 : TopologicalSpace.{u3} Z] {f : ContinuousMap.{u1, u2} X Y _inst_1 _inst_2}, (ContinuousMap.Nullhomotopic.{u1, u2} X Y _inst_1 _inst_2 f) -> (forall (g : ContinuousMap.{u2, u3} Y Z _inst_2 _inst_3), ContinuousMap.Nullhomotopic.{u1, u3} X Z _inst_1 _inst_3 (ContinuousMap.comp.{u1, u2, u3} X Y Z _inst_1 _inst_2 _inst_3 g f))
+but is expected to have type
+  forall {X : Type.{u3}} {Y : Type.{u2}} {Z : Type.{u1}} [_inst_1 : TopologicalSpace.{u3} X] [_inst_2 : TopologicalSpace.{u2} Y] [_inst_3 : TopologicalSpace.{u1} Z] {f : ContinuousMap.{u3, u2} X Y _inst_1 _inst_2}, (ContinuousMap.Nullhomotopic.{u3, u2} X Y _inst_1 _inst_2 f) -> (forall (g : ContinuousMap.{u2, u1} Y Z _inst_2 _inst_3), ContinuousMap.Nullhomotopic.{u3, u1} X Z _inst_1 _inst_3 (ContinuousMap.comp.{u3, u2, u1} X Y Z _inst_1 _inst_2 _inst_3 g f))
+Case conversion may be inaccurate. Consider using '#align continuous_map.nullhomotopic.comp_right ContinuousMap.Nullhomotopic.comp_rightₓ'. -/
 theorem Nullhomotopic.comp_right {f : C(X, Y)} (hf : f.Nullhomotopic) (g : C(Y, Z)) :
     (g.comp f).Nullhomotopic := by
   cases' hf with y hy
@@ -40,6 +54,12 @@ theorem Nullhomotopic.comp_right {f : C(X, Y)} (hf : f.Nullhomotopic) (g : C(Y,
   exact homotopic.hcomp hy (homotopic.refl g)
 #align continuous_map.nullhomotopic.comp_right ContinuousMap.Nullhomotopic.comp_right
 
+/- warning: continuous_map.nullhomotopic.comp_left -> ContinuousMap.Nullhomotopic.comp_left is a dubious translation:
+lean 3 declaration is
+  forall {X : Type.{u1}} {Y : Type.{u2}} {Z : Type.{u3}} [_inst_1 : TopologicalSpace.{u1} X] [_inst_2 : TopologicalSpace.{u2} Y] [_inst_3 : TopologicalSpace.{u3} Z] {f : ContinuousMap.{u2, u3} Y Z _inst_2 _inst_3}, (ContinuousMap.Nullhomotopic.{u2, u3} Y Z _inst_2 _inst_3 f) -> (forall (g : ContinuousMap.{u1, u2} X Y _inst_1 _inst_2), ContinuousMap.Nullhomotopic.{u1, u3} X Z _inst_1 _inst_3 (ContinuousMap.comp.{u1, u2, u3} X Y Z _inst_1 _inst_2 _inst_3 f g))
+but is expected to have type
+  forall {X : Type.{u1}} {Y : Type.{u3}} {Z : Type.{u2}} [_inst_1 : TopologicalSpace.{u1} X] [_inst_2 : TopologicalSpace.{u3} Y] [_inst_3 : TopologicalSpace.{u2} Z] {f : ContinuousMap.{u3, u2} Y Z _inst_2 _inst_3}, (ContinuousMap.Nullhomotopic.{u3, u2} Y Z _inst_2 _inst_3 f) -> (forall (g : ContinuousMap.{u1, u3} X Y _inst_1 _inst_2), ContinuousMap.Nullhomotopic.{u1, u2} X Z _inst_1 _inst_3 (ContinuousMap.comp.{u1, u3, u2} X Y Z _inst_1 _inst_2 _inst_3 f g))
+Case conversion may be inaccurate. Consider using '#align continuous_map.nullhomotopic.comp_left ContinuousMap.Nullhomotopic.comp_leftₓ'. -/
 theorem Nullhomotopic.comp_left {f : C(Y, Z)} (hf : f.Nullhomotopic) (g : C(X, Y)) :
     (f.comp g).Nullhomotopic := by
   cases' hf with y hy
@@ -53,12 +73,15 @@ open ContinuousMap
 
 open ContinuousMap
 
+#print ContractibleSpace /-
 /- ./././Mathport/Syntax/Translate/Command.lean:393:30: infer kinds are unsupported in Lean 4: #[`hequiv_unit] [] -/
 /-- A contractible space is one that is homotopy equivalent to `unit`. -/
 class ContractibleSpace (X : Type _) [TopologicalSpace X] : Prop where
   hequiv_unit : Nonempty (X ≃ₕ Unit)
 #align contractible_space ContractibleSpace
+-/
 
+#print id_nullhomotopic /-
 theorem id_nullhomotopic (X : Type _) [TopologicalSpace X] [ContractibleSpace X] :
     (ContinuousMap.id X).Nullhomotopic :=
   by
@@ -67,7 +90,9 @@ theorem id_nullhomotopic (X : Type _) [TopologicalSpace X] [ContractibleSpace X]
   convert hv.left_inv.symm
   ext; simp; congr
 #align id_nullhomotopic id_nullhomotopic
+-/
 
+#print contractible_iff_id_nullhomotopic /-
 theorem contractible_iff_id_nullhomotopic (Y : Type _) [TopologicalSpace Y] :
     ContractibleSpace Y ↔ (ContinuousMap.id Y).Nullhomotopic :=
   by
@@ -84,14 +109,23 @@ theorem contractible_iff_id_nullhomotopic (Y : Type _) [TopologicalSpace Y] :
   · convert homotopic.refl (ContinuousMap.id Unit)
     ext
 #align contractible_iff_id_nullhomotopic contractible_iff_id_nullhomotopic
+-/
 
 variable {X Y : Type _} [TopologicalSpace X] [TopologicalSpace Y]
 
+#print ContinuousMap.HomotopyEquiv.contractibleSpace /-
 protected theorem ContinuousMap.HomotopyEquiv.contractibleSpace [ContractibleSpace Y] (e : X ≃ₕ Y) :
     ContractibleSpace X :=
   ⟨(ContractibleSpace.hequiv_unit Y).map e.trans⟩
 #align continuous_map.homotopy_equiv.contractible_space ContinuousMap.HomotopyEquiv.contractibleSpace
+-/
 
+/- warning: continuous_map.homotopy_equiv.contractible_space_iff -> ContinuousMap.HomotopyEquiv.contractibleSpace_iff is a dubious translation:
+lean 3 declaration is
+  forall {X : Type.{u1}} {Y : Type.{u2}} [_inst_1 : TopologicalSpace.{u1} X] [_inst_2 : TopologicalSpace.{u2} Y], (ContinuousMap.HomotopyEquiv.{u1, u2} X Y _inst_1 _inst_2) -> (Iff (ContractibleSpace.{u1} X _inst_1) (ContractibleSpace.{u2} Y _inst_2))
+but is expected to have type
+  forall {X : Type.{u2}} {Y : Type.{u1}} [_inst_1 : TopologicalSpace.{u2} X] [_inst_2 : TopologicalSpace.{u1} Y], (ContinuousMap.HomotopyEquiv.{u2, u1} X Y _inst_1 _inst_2) -> (Iff (ContractibleSpace.{u2} X _inst_1) (ContractibleSpace.{u1} Y _inst_2))
+Case conversion may be inaccurate. Consider using '#align continuous_map.homotopy_equiv.contractible_space_iff ContinuousMap.HomotopyEquiv.contractibleSpace_iffₓ'. -/
 protected theorem ContinuousMap.HomotopyEquiv.contractibleSpace_iff (e : X ≃ₕ Y) :
     ContractibleSpace X ↔ ContractibleSpace Y :=
   ⟨by
@@ -101,11 +135,19 @@ protected theorem ContinuousMap.HomotopyEquiv.contractibleSpace_iff (e : X ≃
     exact e.contractible_space⟩
 #align continuous_map.homotopy_equiv.contractible_space_iff ContinuousMap.HomotopyEquiv.contractibleSpace_iff
 
+#print Homeomorph.contractibleSpace /-
 protected theorem Homeomorph.contractibleSpace [ContractibleSpace Y] (e : X ≃ₜ Y) :
     ContractibleSpace X :=
   e.toHomotopyEquiv.ContractibleSpace
 #align homeomorph.contractible_space Homeomorph.contractibleSpace
+-/
 
+/- warning: homeomorph.contractible_space_iff -> Homeomorph.contractibleSpace_iff is a dubious translation:
+lean 3 declaration is
+  forall {X : Type.{u1}} {Y : Type.{u2}} [_inst_1 : TopologicalSpace.{u1} X] [_inst_2 : TopologicalSpace.{u2} Y], (Homeomorph.{u1, u2} X Y _inst_1 _inst_2) -> (Iff (ContractibleSpace.{u1} X _inst_1) (ContractibleSpace.{u2} Y _inst_2))
+but is expected to have type
+  forall {X : Type.{u2}} {Y : Type.{u1}} [_inst_1 : TopologicalSpace.{u2} X] [_inst_2 : TopologicalSpace.{u1} Y], (Homeomorph.{u2, u1} X Y _inst_1 _inst_2) -> (Iff (ContractibleSpace.{u2} X _inst_1) (ContractibleSpace.{u1} Y _inst_2))
+Case conversion may be inaccurate. Consider using '#align homeomorph.contractible_space_iff Homeomorph.contractibleSpace_iffₓ'. -/
 protected theorem Homeomorph.contractibleSpace_iff (e : X ≃ₜ Y) :
     ContractibleSpace X ↔ ContractibleSpace Y :=
   e.toHomotopyEquiv.contractibleSpace_iff

16728b30

bump to nightly-2023-04-24-06

mathlib commit https://github.com/leanprover-community/mathlib/commit/09079525fd01b3dda35e96adaa08d2f943e1648c

ff662d55

Diff

@@ -53,7 +53,7 @@ open ContinuousMap
 
 open ContinuousMap
 
-/- ./././Mathport/Syntax/Translate/Command.lean:388:30: infer kinds are unsupported in Lean 4: #[`hequiv_unit] [] -/
+/- ./././Mathport/Syntax/Translate/Command.lean:393:30: infer kinds are unsupported in Lean 4: #[`hequiv_unit] [] -/
 /-- A contractible space is one that is homotopy equivalent to `unit`. -/
 class ContractibleSpace (X : Type _) [TopologicalSpace X] : Prop where
   hequiv_unit : Nonempty (X ≃ₕ Unit)

16728b30

bump to nightly-2023-02-21-16

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

1107b979

Changes in mathlib4

mathlib3

mathlib4

16728b30

chore: remove many Type _ before the colon (#7718)

We have turned to Type* instead of Type _, but many of them remained in mathlib because the straight replacement did not work. In general, having Type _ before the colon is a code smell, though, as it hides which types should be in the same universe and which shouldn't, and is not very robust.

This PR replaces most of the remaining Type _ before the colon (except those in category theory) by Type* or Type u. This has uncovered a few bugs (where declarations were not as polymorphic as they should be).

I had to increase heartbeats at two places when replacing Type _ by Type*, but I think it's worth it as it's really more robust.

fe9572d2

Diff

@@ -14,7 +14,6 @@ import Mathlib.Topology.Homotopy.Equiv
 In this file, we define `ContractibleSpace`, a space that is homotopy equivalent to `Unit`.
 -/
 
-
 noncomputable section
 
 namespace ContinuousMap
@@ -106,6 +105,17 @@ protected theorem Homeomorph.contractibleSpace_iff (e : X ≃ₜ Y) :
 
 namespace ContractibleSpace
 
+instance [Unique Y] : ContractibleSpace Y := by
+  have : ContractibleSpace (Unit) := ⟨⟨HomotopyEquiv.refl Unit⟩⟩
+  apply (Homeomorph.homeomorphOfUnique Y Unit).contractibleSpace
+
+variable (X Y) in
+theorem hequiv [ContractibleSpace X] [ContractibleSpace Y] :
+    Nonempty (X ≃ₕ Y) := by
+  rcases ContractibleSpace.hequiv_unit' (X := X) with ⟨h⟩
+  rcases ContractibleSpace.hequiv_unit' (X := Y) with ⟨h'⟩
+  exact ⟨h.trans h'.symm⟩
+
 instance (priority := 100) [ContractibleSpace X] : PathConnectedSpace X := by
   obtain ⟨p, ⟨h⟩⟩ := id_nullhomotopic X
   have : ∀ x, Joined p x := fun x => ⟨(h.evalAt x).symm⟩

16728b30

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

@@ -19,7 +19,7 @@ noncomputable section
 
 namespace ContinuousMap
 
-variable {X Y Z : Type _} [TopologicalSpace X] [TopologicalSpace Y] [TopologicalSpace Z]
+variable {X Y Z : Type*} [TopologicalSpace X] [TopologicalSpace Y] [TopologicalSpace Z]
 
 /-- A map is nullhomotopic if it is homotopic to a constant map. -/
 def Nullhomotopic (f : C(X, Y)) : Prop :=
@@ -49,24 +49,24 @@ end ContinuousMap
 open ContinuousMap
 
 /-- A contractible space is one that is homotopy equivalent to `Unit`. -/
-class ContractibleSpace (X : Type _) [TopologicalSpace X] : Prop where
+class ContractibleSpace (X : Type*) [TopologicalSpace X] : Prop where
   hequiv_unit' : Nonempty (X ≃ₕ Unit)
 #align contractible_space ContractibleSpace
 
 -- Porting note: added to work around lack of infer kinds
-theorem ContractibleSpace.hequiv_unit (X : Type _) [TopologicalSpace X] [ContractibleSpace X] :
+theorem ContractibleSpace.hequiv_unit (X : Type*) [TopologicalSpace X] [ContractibleSpace X] :
     Nonempty (X ≃ₕ Unit) :=
   ContractibleSpace.hequiv_unit'
 #align contractible_space.hequiv_unit ContractibleSpace.hequiv_unit
 
-theorem id_nullhomotopic (X : Type _) [TopologicalSpace X] [ContractibleSpace X] :
+theorem id_nullhomotopic (X : Type*) [TopologicalSpace X] [ContractibleSpace X] :
     (ContinuousMap.id X).Nullhomotopic := by
   obtain ⟨hv⟩ := ContractibleSpace.hequiv_unit X
   use hv.invFun ()
   convert hv.left_inv.symm
 #align id_nullhomotopic id_nullhomotopic
 
-theorem contractible_iff_id_nullhomotopic (Y : Type _) [TopologicalSpace Y] :
+theorem contractible_iff_id_nullhomotopic (Y : Type*) [TopologicalSpace Y] :
     ContractibleSpace Y ↔ (ContinuousMap.id Y).Nullhomotopic := by
   constructor
   · intro
@@ -82,7 +82,7 @@ theorem contractible_iff_id_nullhomotopic (Y : Type _) [TopologicalSpace Y] :
   · convert Homotopic.refl (ContinuousMap.id Unit)
 #align contractible_iff_id_nullhomotopic contractible_iff_id_nullhomotopic
 
-variable {X Y : Type _} [TopologicalSpace X] [TopologicalSpace Y]
+variable {X Y : Type*} [TopologicalSpace X] [TopologicalSpace Y]
 
 protected theorem ContinuousMap.HomotopyEquiv.contractibleSpace [ContractibleSpace Y] (e : X ≃ₕ Y) :
     ContractibleSpace X :=

16728b30

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

@@ -2,15 +2,12 @@
 Copyright (c) 2022 Praneeth Kolichala. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Praneeth Kolichala
-
-! This file was ported from Lean 3 source module topology.homotopy.contractible
-! leanprover-community/mathlib commit 16728b3064a1751103e1dc2815ed8d00560e0d87
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathlib.Topology.Homotopy.Path
 import Mathlib.Topology.Homotopy.Equiv
 
+#align_import topology.homotopy.contractible from "leanprover-community/mathlib"@"16728b3064a1751103e1dc2815ed8d00560e0d87"
+
 /-!
 # Contractible spaces

16728b30

feat: port Topology.Homotopy.Contractible (#3960)

adf58592

`topology.homotopy.contractible` ⟷ `Mathlib.Topology.Homotopy.Contractible`

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 10 + 562

topology.homotopy.contractible ⟷ Mathlib.Topology.Homotopy.Contractible

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 10 + 562

`topology.homotopy.contractible` ⟷ `Mathlib.Topology.Homotopy.Contractible`