Question

Definition of coevaluation map of a stable category defined in Tammo tom Dieck's Algebraic Topology.

score 61 · Answer 1 · 2026-03-25 19:06:56

61

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Definition of coevaluation map of a stable category defined in Tammo tom Dieck's Algebraic Topology.

Published on 25 Mar 2026 - 19:06

score 120 · Answer 2 · 2026-04-14 14:18:12

120

Views

Does the interior of a closed jordan curve in the plane depend continuously on the curve?

Published on 14 Apr 2026 - 14:18

score 176 · Answer 3 · 2026-04-13 00:57:54

176

Views

Show that the path components $\pi_0$ of $X = U \cup V$ form a pushout diagram.

Published on 13 Apr 2026 - 0:57

score 89 · Answer 4 · 2026-04-16 01:42:22

89

Views

Lift of Fundamental groups implies the inverse image is reducible

Published on 16 Apr 2026 - 1:42

score 80 · Answer 5 · 2026-04-14 10:24:32

80

Views

Show that $[u]$ is a generator of $\pi(S^1,1)$

Published on 14 Apr 2026 - 10:24

score 78 · Answer 6 · 2026-04-16 00:20:39

78

Views

$\pi_1(Y,y_0)\neq\{1\}$ for some $(Y,y_0)\implies\pi_1(S^1,1)\neq\{1\}$

Published on 16 Apr 2026 - 0:20

score 106 · Answer 7 · 2026-04-09 17:07:29

106

Views

what $Hom(\mathbb{Z}\oplus\mathbb{Z}, \mathbb{Z}/2)$ is?

Published on 09 Apr 2026 - 17:07

score 871 · Answer 8 · 2026-03-25 23:25:57

871

Views

Euler characteristic of a manifold is odd

Published on 25 Mar 2026 - 23:25

score 955 · Answer 9 · 2026-04-09 08:24:32

955

Views

Deformation retraction arising from a mapping cylinder.

Published on 09 Apr 2026 - 8:24

score 39 · Answer 10 · 2026-04-09 08:26:09

39

Views

Changing the codomain in the definition of the retraction map.

Published on 09 Apr 2026 - 8:26

score 191 · Answer 11 · 2026-04-13 00:58:51

191

Views

Why the natural projection asociated to an action on a quotient space is an open map?

Published on 13 Apr 2026 - 0:58

score 108 · Answer 12 · 2026-04-15 14:42:03

108

Views

Explanation of fundamental groups $\pi_1(X_0,x_0)\approx\pi_1(X,x_0)$

Published on 15 Apr 2026 - 14:42

score 103 · Answer 13 · 2026-04-12 19:42:42

103

Views

Resource for double branched covers

Published on 12 Apr 2026 - 19:42

score 532 · Answer 14 · 2026-03-25 22:05:31

532

Views

What is the relation between homology groups of a manifold with boundary and space obtained after removing its boundary?

Published on 25 Mar 2026 - 22:05

score 114 · Answer 15 · 2026-04-16 08:55:59

114

Views

Why does there exist a continuous map $f : X \to K(\pi_n(X), n)$ inducing the identity map $1_{\pi_n(X)}$?

Published on 16 Apr 2026 - 8:55

List Question

Definition of coevaluation map of a stable category defined in Tammo tom Dieck's Algebraic Topology.

Does the interior of a closed jordan curve in the plane depend continuously on the curve?

Show that the path components $\pi_0$ of $X = U \cup V$ form a pushout diagram.

Lift of Fundamental groups implies the inverse image is reducible

Show that $[u]$ is a generator of $\pi(S^1,1)$

$\pi_1(Y,y_0)\neq\{1\}$ for some $(Y,y_0)\implies\pi_1(S^1,1)\neq\{1\}$

what $Hom(\mathbb{Z}\oplus\mathbb{Z}, \mathbb{Z}/2)$ is?

Euler characteristic of a manifold is odd

Deformation retraction arising from a mapping cylinder.

Changing the codomain in the definition of the retraction map.

Why the natural projection asociated to an action on a quotient space is an open map?

Explanation of fundamental groups $\pi_1(X_0,x_0)\approx\pi_1(X,x_0)$

Resource for double branched covers

What is the relation between homology groups of a manifold with boundary and space obtained after removing its boundary?

Why does there exist a continuous map $f : X \to K(\pi_n(X), n)$ inducing the identity map $1_{\pi_n(X)}$?

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