Question

Union of a sequence of increasing CW-complexes and Retract

score 216 · Answer 1 · 2020-02-05 06:38:05

216

Views

Union of a sequence of increasing CW-complexes and Retract

Published on 05 Feb 2020 - 6:38

score 43 · Answer 2 · 2020-02-29 03:33:42

43

Views

What does it mean to show that r is retraction? I am confused about what the problem wants.

Published on 29 Feb 2020 - 3:33

score 122 · Answer 3 · 2020-04-06 18:08:47

122

Views

Is the 3d model of a Klein bottle a cross-section of its 4d embedding?

Published on 06 Apr 2020 - 18:08

score 163 · Answer 4 · 2020-04-07 11:38:19

163

Views

If $X \times Y$ is contractible, then $X$ and $Y$ are contractible.

Published on 07 Apr 2020 - 11:38

score 198 · Answer 5 · 2020-04-10 17:20:27

198

Views

Is there any closed embedding which is not cofibration?

Published on 10 Apr 2020 - 17:20

score 173 · Answer 6 · 2020-04-11 12:04:54

173

Views

Show that a retract of a cofibration is also a cofibration.

Published on 11 Apr 2020 - 12:04

score 100 · Answer 7 · 2020-04-25 22:59:29

100

Views

Proving that every arc in a normal space $X$ is a retract of it using commutative diagrams and a different version of Tietze extension theorem.

Published on 25 Apr 2020 - 22:59

score 510 · Answer 8 · 2020-04-26 06:38:34

510

Views

Proving that $S^1$ is not a retract of the disk $D^2$ or of the plane $\mathbb{R}^2$ using a problem that I already solved.

Published on 26 Apr 2020 - 6:38

score 141 · Answer 9 · 2020-04-27 15:30:08

141

Views

Find a function that makes the following diagram commutes.

Published on 27 Apr 2020 - 15:30

score 165 · Answer 10 · 2020-04-29 07:49:33

165

Views

Show that the function $f$ is well-defined and continuous.

Published on 29 Apr 2020 - 7:49

score 105 · Answer 11 · 2020-04-29 16:40:02

105

Views

Use the function $f$ to show that $S^1$ is a retract of $\mathbb{R}^2.$

Published on 29 Apr 2020 - 16:40

score 132 · Answer 12 · 2020-05-06 19:48:22

132

Views

Retraction formulation of the homotopy extension property

Published on 06 May 2020 - 19:48

score 1k · Answer 13 · 2020-05-11 07:35:21

1k

Views

Deformation Retract is an isomorphism

Published on 11 May 2020 - 7:35

score 39 · Answer 14 · 2020-05-20 13:12:41

39

Views

Retract spaces- Material or book recomendations

Published on 20 May 2020 - 13:12

score 274 · Answer 15 · 2020-06-02 23:45:58

274

Views

Comparing 2 solutions of problem 2 chapter 0 of Allen Hatcher.

Published on 02 Jun 2020 - 23:45

List Question

Union of a sequence of increasing CW-complexes and Retract

What does it mean to show that r is retraction? I am confused about what the problem wants.

Is the 3d model of a Klein bottle a cross-section of its 4d embedding?

If $X \times Y$ is contractible, then $X$ and $Y$ are contractible.

Is there any closed embedding which is not cofibration?

Show that a retract of a cofibration is also a cofibration.

Proving that every arc in a normal space $X$ is a retract of it using commutative diagrams and a different version of Tietze extension theorem.

Proving that $S^1$ is not a retract of the disk $D^2$ or of the plane $\mathbb{R}^2$ using a problem that I already solved.

Find a function that makes the following diagram commutes.

Show that the function $f$ is well-defined and continuous.

Use the function $f$ to show that $S^1$ is a retract of $\mathbb{R}^2.$

Retraction formulation of the homotopy extension property

Deformation Retract is an isomorphism

Retract spaces- Material or book recomendations

Comparing 2 solutions of problem 2 chapter 0 of Allen Hatcher.

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