Question

Covering map of the universal cover $\widetilde{G} \rightarrow G$ for $G$ a Lie group is a homomorphism?

score 375 · Answer 1 · 2026-03-30 11:59:27

375

Views

Covering map of the universal cover $\widetilde{G} \rightarrow G$ for $G$ a Lie group is a homomorphism?

Published on 30 Mar 2026 - 11:59

score 959 · Answer 2 · 2026-03-26 14:30:23

959

Views

Do i imagine the linear (straight line) homotopy in a correct way?

Published on 26 Mar 2026 - 14:30

score 89 · Answer 3 · 2026-04-11 14:18:59

89

Views

Postnikov towers agreeing at some stage

Published on 11 Apr 2026 - 14:18

score 172 · Answer 4 · 2026-04-12 06:15:24

172

Views

Singular Cohomology satisfies the Mittag-Leffler Condition on CW complexes?

Published on 12 Apr 2026 - 6:15

score 96 · Answer 5 · 2026-03-31 03:32:07

96

Views

A compact $n-1$ manifold can be embedded in $\mathbb{R}^n$ iff it can be embedded in $S^n$

Published on 31 Mar 2026 - 3:32

score 1.1k · Answer 6 · 2026-03-25 07:45:44

1.1k

Views

Find $f$ such that $f^{-1}(\lbrace0\rbrace)$ is this knotted curve (M.W.Hirsh)

Published on 25 Mar 2026 - 7:45

score 107 · Answer 7 · 2026-04-09 16:36:59

107

Views

Relationship between locally trivial and locally non vanishing section.

Published on 09 Apr 2026 - 16:36

score 136 · Answer 8 · 2026-04-01 04:30:41

136

Views

if $\operatorname{Hom}(A,\mathbb{Q})=0$ and $\operatorname{Ext}(A,\mathbb{Z}_p)=\operatorname{Hom}(A,\mathbb{Z}_p)=0$ implies $A=0$

Published on 01 Apr 2026 - 4:30

score 170 · Answer 9 · 2026-04-12 09:40:17

170

Views

Degree of Line bundle and Intersection

Published on 12 Apr 2026 - 9:40

score 87 · Answer 10 · 2026-03-26 22:53:46

87

Views

Orbit space of $\mathbb{Z}_2$-action on the torus $T^2$

Published on 26 Mar 2026 - 22:53

score 132 · Answer 11 · 2026-04-09 00:13:34

Does the inclusion of a 1-dimensional space into another induce isomorphism on fundamental groups if the spaces have fundamental group $\mathbb{Z}$?

score 793 · Answer 12 · 2026-04-12 02:47:52

793

Views

Prove that $SU(n)$ is simply-connected (using Van Kampen)

Published on 12 Apr 2026 - 2:47

score 422 · Answer 13 · 2026-03-25 09:34:59

422

Views

Using grid diagram to compute the Alexander polynomial

Published on 25 Mar 2026 - 9:34

score 171 · Answer 14 · 2019-04-23 22:03:20

171

Views

Homotopy classes of self-maps on $\mathbb{S}^1\vee\mathbb{S}^1$

Published on 23 Apr 2019 - 22:03

score 212 · Answer 15 · 2026-04-10 06:42:56

212

Views

Is self intersection still homeomorphic?

Published on 10 Apr 2026 - 6:42

List Question

Covering map of the universal cover $\widetilde{G} \rightarrow G$ for $G$ a Lie group is a homomorphism?

Do i imagine the linear (straight line) homotopy in a correct way?

Postnikov towers agreeing at some stage

Singular Cohomology satisfies the Mittag-Leffler Condition on CW complexes?

A compact $n-1$ manifold can be embedded in $\mathbb{R}^n$ iff it can be embedded in $S^n$

Find $f$ such that $f^{-1}(\lbrace0\rbrace)$ is this knotted curve (M.W.Hirsh)

Relationship between locally trivial and locally non vanishing section.

if $\operatorname{Hom}(A,\mathbb{Q})=0$ and $\operatorname{Ext}(A,\mathbb{Z}_p)=\operatorname{Hom}(A,\mathbb{Z}_p)=0$ implies $A=0$

Degree of Line bundle and Intersection

Orbit space of $\mathbb{Z}_2$-action on the torus $T^2$

Does the inclusion of a 1-dimensional space into another induce isomorphism on fundamental groups if the spaces have fundamental group $\mathbb{Z}$?

Prove that $SU(n)$ is simply-connected (using Van Kampen)

Using grid diagram to compute the Alexander polynomial

Homotopy classes of self-maps on $\mathbb{S}^1\vee\mathbb{S}^1$

Is self intersection still homeomorphic?

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