Question

Example of a compact subset that is not closed

score 878 · Answer 1 · 2026-03-27 14:01:25

878

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Example of a compact subset that is not closed

Published on 27 Mar 2026 - 14:01

score 342 · Answer 2 · 2026-04-03 12:39:33

342

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Let $(S,T)$ be a topological space. Verify that the intersection of any finite number of sets in $T$ is also in $T$

Published on 03 Apr 2026 - 12:39

score 331 · Answer 3 · 2026-04-04 01:51:23

331

Views

Homology/Cohomology Theories for Non-Locally Connected Spaces

Published on 04 Apr 2026 - 1:51

score 82 · Answer 4 · 2026-03-27 07:20:03

82

Views

Knots and anti-knots in 3+ dimensions

Published on 27 Mar 2026 - 7:20

score 83 · Answer 5 · 2026-03-28 14:56:54

83

Views

Is $S= \{x:x(\omega)\geq 1,x\in C(\Omega)\}$ closed or compact where $\Omega$ is a compact metric space?

Published on 28 Mar 2026 - 14:56

score 86 · Answer 6 · 2018-06-03 03:11:48

86

Views

A relationship between Hausdorffness, compactness and graph-closedness.

Published on 03 Jun 2018 - 3:11

score 131 · Answer 7 · 2018-06-03 04:17:17

131

Views

Complement of Closed Interval with Closed Subset

Published on 03 Jun 2018 - 4:17

score 286 · Answer 8 · 2026-03-28 12:14:31

286

Views

Topological properties of subsets of $\mathbb{R}$ with uncountably many connected components

Published on 28 Mar 2026 - 12:14

score 66 · Answer 9 · 2018-06-03 07:55:40

66

Views

Study the relationship between two topologies

Published on 03 Jun 2018 - 7:55

score 17.6k · Answer 10 · 2026-03-25 16:45:36

17.6k

Views

Explain this mathematical meme (Geometers bird interrupting Topologists bird)

Published on 25 Mar 2026 - 16:45

score 36 · Answer 11 · 2026-03-28 14:55:01

36

Views

A curiosity on covers of compact

Published on 28 Mar 2026 - 14:55

score 213 · Answer 12 · 2026-04-06 14:55:53

213

Views

Topological transitivity+contraction

Published on 06 Apr 2026 - 14:55

score 28 · Answer 13 · 2018-06-03 14:43:00

28

Views

How to ensure that the set forms a topological space?

Published on 03 Jun 2018 - 14:43

score 71 · Answer 14 · 2018-06-03 18:06:29

71

Views

Can $f$ be extended to a continuous function from $S$ to $\Bbb R$?

Published on 03 Jun 2018 - 18:06

score 90 · Answer 15 · 2026-04-01 06:11:15

90

Views

How to prove that this recurrent sequence is Cauchy

Published on 01 Apr 2026 - 6:11

List Question

Example of a compact subset that is not closed

Let $(S,T)$ be a topological space. Verify that the intersection of any finite number of sets in $T$ is also in $T$

Homology/Cohomology Theories for Non-Locally Connected Spaces

Knots and anti-knots in 3+ dimensions

Is $S= \{x:x(\omega)\geq 1,x\in C(\Omega)\}$ closed or compact where $\Omega$ is a compact metric space?

A relationship between Hausdorffness, compactness and graph-closedness.

Complement of Closed Interval with Closed Subset

Topological properties of subsets of $\mathbb{R}$ with uncountably many connected components

Study the relationship between two topologies

Explain this mathematical meme (Geometers bird interrupting Topologists bird)

A curiosity on covers of compact

Topological transitivity+contraction

How to ensure that the set forms a topological space?

Can $f$ be extended to a continuous function from $S$ to $\Bbb R$?

How to prove that this recurrent sequence is Cauchy

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