Question

Using Urysohn's lemma to prove that $\mathbb R_l\times \mathbb R_l$ is not normal

score 709 · Answer 1 · 2026-04-15 14:26:35

709

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Using Urysohn's lemma to prove that $\mathbb R_l\times \mathbb R_l$ is not normal

Published on 15 Apr 2026 - 14:26

score 52 · Answer 2 · 2026-04-15 09:43:30

52

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Proving that there are only 2 ways to glue pairs of sides of a fundamental polygon

Published on 15 Apr 2026 - 9:43

score 248 · Answer 3 · 2026-04-08 21:11:32

248

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Question about two definitions of local compactness.

Published on 08 Apr 2026 - 21:11

score 76 · Answer 4 · 2026-04-13 19:08:17

76

Views

Fiber sequence, a group and an $n$-group

Published on 13 Apr 2026 - 19:08

score 388 · Answer 5 · 2026-04-09 17:31:54

388

Views

Homomorphism between compact Hausdorff spaces.

Published on 09 Apr 2026 - 17:31

score 268 · Answer 6 · 2026-04-09 12:01:19

268

Views

prove the following lemma about a compact space and a ultrametric.

Published on 09 Apr 2026 - 12:01

score 51 · Answer 7 · 2026-04-16 04:09:53

51

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minimal equivalence relations free action of a group G on X

Published on 16 Apr 2026 - 4:09

score 3.7k · Answer 8 · 2026-04-14 01:41:08

3.7k

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What is the standard topology of real line? Why is $(0,1)$ called open but $[0,1]$ not open on this topology?

Published on 14 Apr 2026 - 1:41

score 358 · Answer 9 · 2026-04-23 00:06:39

358

Views

A first countable hemicompact space is locally compact

Published on 23 Apr 2026 - 0:06

score 146 · Answer 10 · 2026-04-21 11:03:46

146

Views

To check whether given space is metrizable

Published on 21 Apr 2026 - 11:03

score 446 · Answer 11 · 2026-04-16 12:20:18

446

Views

Changing the distance considered on a metric space changes open sets inside?

Published on 16 Apr 2026 - 12:20

score 848 · Answer 12 · 2026-04-12 01:11:21

848

Views

Given basis of an ordered square seems to be only open intervals

Published on 12 Apr 2026 - 1:11

score 600 · Answer 13 · 2026-04-11 11:58:28

600

Views

About the universal property of initial and final topologies

Published on 11 Apr 2026 - 11:58

score 433 · Answer 14 · 2026-03-25 03:22:46

433

Views

To what extent are homeomorphisms just deformations?

Published on 25 Mar 2026 - 3:22

score 194 · Answer 15 · 2026-04-13 17:51:23

194

Views

Show that the distance is a continuous function and property on the metric topology

Published on 13 Apr 2026 - 17:51

List Question

Using Urysohn's lemma to prove that $\mathbb R_l\times \mathbb R_l$ is not normal

Proving that there are only 2 ways to glue pairs of sides of a fundamental polygon

Question about two definitions of local compactness.

Fiber sequence, a group and an $n$-group

Homomorphism between compact Hausdorff spaces.

prove the following lemma about a compact space and a ultrametric.

minimal equivalence relations free action of a group G on X

What is the standard topology of real line? Why is $(0,1)$ called open but $[0,1]$ not open on this topology?

A first countable hemicompact space is locally compact

To check whether given space is metrizable

Changing the distance considered on a metric space changes open sets inside?

Given basis of an ordered square seems to be only open intervals

About the universal property of initial and final topologies

To what extent are homeomorphisms just deformations?

Show that the distance is a continuous function and property on the metric topology

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