Question

Computing fundamental group of the complement to three infinite straight lines, and of complement to $S^1 \cup {Z} $

score 193 · Answer 1 · 2016-04-06 12:41:50

193

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Computing fundamental group of the complement to three infinite straight lines, and of complement to $S^1 \cup {Z} $

Published on 06 Apr 2016 - 12:41

score 441 · Answer 2 · 2016-04-07 05:20:04

441

Views

group actions of fundamental groups on homotopy groups

Published on 07 Apr 2016 - 5:20

score 38 · Answer 3 · 2016-04-09 19:27:25

38

Views

IF $S$ is a torus and $p,q$ are two different points of $S$, how can I calculate $\pi (S \setminus\{p\})?$ and $\pi (S \setminus \{p,q\})$?

Published on 09 Apr 2016 - 19:27

score 70 · Answer 4 · 2016-04-12 09:18:26

70

Views

Image of map of étale fundamental groups

Published on 12 Apr 2016 - 9:18

score 45 · Answer 5 · 2026-03-28 17:41:18

45

Views

The dimension of $H_i(X_n, \mathbb{Q})$ is linear in $n$ with a bounded nonnegative error, where the error is periodic?

Published on 28 Mar 2026 - 17:41

score 629 · Answer 6 · 2026-03-30 08:23:54

629

Views

Fundamental group and universal cover for this quotient space

Published on 30 Mar 2026 - 8:23

score 1.5k · Answer 7 · 2016-04-13 22:27:05

1.5k

Views

Infinite wedge sum of circles and a space homotopy equivalent

Published on 13 Apr 2016 - 22:27

score 3.6k · Answer 8 · 2026-03-23 08:41:02

3.6k

Views

Relations between center (fundamental group) and (co)root and weight lattices for Lie groups

Published on 23 Mar 2026 - 8:41

score 186 · Answer 9 · 2026-03-27 18:15:00

186

Views

CW structures of identification spaces, fundamental groups and universal covers

Published on 27 Mar 2026 - 18:15

score 1.5k · Answer 10 · 2026-03-30 10:14:00

1.5k

Views

Is the Fundamental Group of space with contractible universal cover torsion-free?

Published on 30 Mar 2026 - 10:14

score 199 · Answer 11 · 2016-04-23 20:43:15

199

Views

Show that $\pi(X, x) = [e_x]$ if $X$ is a finite topological space with the discrete topology.

Published on 23 Apr 2016 - 20:43

score 251 · Answer 12 · 2016-04-27 12:17:29

251

Views

Unique homomorphisms between fundamental groups of topological spaces

Published on 27 Apr 2016 - 12:17

score 395 · Answer 13 · 2016-04-29 21:29:41

395

Views

Computing the fundamental group

Published on 29 Apr 2016 - 21:29

score 813 · Answer 14 · 2016-05-02 22:37:24

813

Views

Problem computing the fundamental group of the double torus.

Published on 02 May 2016 - 22:37

score 162 · Answer 15 · 2016-05-03 01:13:47

162

Views

Computing fundamental group of the mapping torus $\pi_1(T_{z\mapsto z^r}(S^1))$

Published on 03 May 2016 - 1:13

List Question

Computing fundamental group of the complement to three infinite straight lines, and of complement to $S^1 \cup {Z} $

group actions of fundamental groups on homotopy groups

IF $S$ is a torus and $p,q$ are two different points of $S$, how can I calculate $\pi (S \setminus\{p\})?$ and $\pi (S \setminus \{p,q\})$?

Image of map of étale fundamental groups

The dimension of $H_i(X_n, \mathbb{Q})$ is linear in $n$ with a bounded nonnegative error, where the error is periodic?

Fundamental group and universal cover for this quotient space

Infinite wedge sum of circles and a space homotopy equivalent

Relations between center (fundamental group) and (co)root and weight lattices for Lie groups

CW structures of identification spaces, fundamental groups and universal covers

Is the Fundamental Group of space with contractible universal cover torsion-free?

Show that $\pi(X, x) = [e_x]$ if $X$ is a finite topological space with the discrete topology.

Unique homomorphisms between fundamental groups of topological spaces

Computing the fundamental group

Problem computing the fundamental group of the double torus.

Computing fundamental group of the mapping torus $\pi_1(T_{z\mapsto z^r}(S^1))$

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