List questions from general-topology

Published on 11 Apr 2026 - 3:06

55

Views

How to show that $\infty$ is isolated?

Published on 16 May 2026 - 9:08

775

Views

Does there exist a continuous, open, and surjective map from $f\colon\mathbb{R}^n\to\mathbb{R}^m$ for $m>n$?

Published on 10 May 2026 - 19:54

270

Views

$[a,b]$ as a smooth manifold with boundary has global coordinates?

Published on 14 Apr 2026 - 2:07

341

Views

Discrete subspace in the product of Sorgenfrey's line.

Published on 13 Apr 2026 - 21:07

2.1k

Views

Homeomorphism between unit circle with point removed to real line.

Published on 14 Apr 2026 - 7:16

194

Views

Path-connectedness of the complement of a finite number of points

Published on 11 May 2026 - 8:37

215

Views

Isomorphism between fundamental groups by attaching $n$-cell

Published on 13 Apr 2026 - 14:57

296

Views

Concluding that $\mathbb{R}P^2$ cannot be embedded in $S^3$

Published on 15 Apr 2026 - 8:34

511

Views

let $A$ be a finite open subset of a metric space $M$ prove that every point in $A$ is an isolated point of $M$

Published on 16 Apr 2026 - 9:19

118

Views

Is weakly continuous operator weakly compact?

Published on 14 May 2026 - 1:28

202

Views

Property of closure of convex sets

Published on 13 Apr 2026 - 0:27

33

Views

closure of. a point

Published on 13 Apr 2026 - 21:42

93

Views

Are Hamiltonians proper maps?

Published on 11 Apr 2026 - 6:31

849

Views

Compact subsets of Polish spaces

Published on 11 May 2026 - 6:48

List Question

Finding a mistake using Mayer-Vietoris

How to show that $\infty$ is isolated?

Does there exist a continuous, open, and surjective map from $f\colon\mathbb{R}^n\to\mathbb{R}^m$ for $m>n$?

$[a,b]$ as a smooth manifold with boundary has global coordinates?

Discrete subspace in the product of Sorgenfrey's line.

Homeomorphism between unit circle with point removed to real line.

Path-connectedness of the complement of a finite number of points

Isomorphism between fundamental groups by attaching $n$-cell

Concluding that $\mathbb{R}P^2$ cannot be embedded in $S^3$

let $A$ be a finite open subset of a metric space $M$ prove that every point in $A$ is an isolated point of $M$

Is weakly continuous operator weakly compact?

Property of closure of convex sets

closure of. a point

Are Hamiltonians proper maps?

Compact subsets of Polish spaces

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