List questions from general-topology

Published on 09 Apr 2026 - 10:27

272

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A Closed Set Definition of Compactness

Published on 14 Apr 2026 - 3:35

75

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Classifying the cotree chords of a torus-embedded graph

Published on 14 Apr 2026 - 22:42

58

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showing two metric spaces are comparable and equal

Published on 11 Apr 2026 - 20:48

196

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Are there well-ordered towers of cardinality that of the continuum?

Published on 12 Apr 2026 - 12:39

51

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Is it obvious that $f\in \mathcal C^m([a,r])$ for all $r<b$ implies that $f\in \mathcal C^m([a,b))$?

Published on 15 Apr 2026 - 4:37

74

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Is $(0,1]$ compact in $\mathbb{R}$?

Published on 10 Apr 2026 - 8:10

418

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Zariski topology and product topology on $\mathbb A_k^m \times \mathbb A_k^n$

Published on 14 Apr 2026 - 13:10

2.3k

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Several Questions on Smooth Urysohn's Lemma

Published on 09 Apr 2026 - 3:54

53

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Finite switching of balls between covering of a compact set

Published on 13 Apr 2026 - 7:20

978

Views

Explicit homeomorphism between $\mathbb{S^2}$ and $\mathbb{P^1(C)}$

Published on 24 Mar 2026 - 23:42

50

Views

How to show that $f : (0,\infty) \to \mathbb{R}^2$ given by $f(t)=(t , \sin(1/t))$ is continuous using open sets?

Published on 14 Apr 2026 - 7:32

271

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What about Union of connected sets?

Published on 09 Apr 2026 - 17:05

51

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The topology generated by $\mathcal{A}$ is minimal

Published on 13 Apr 2026 - 10:25

1.9k

Views

What is known about the continuous image of an open set?

Published on 10 Apr 2026 - 19:44

List Question

Is a point a Jordan Curve?

A Closed Set Definition of Compactness

Classifying the cotree chords of a torus-embedded graph

showing two metric spaces are comparable and equal

Are there well-ordered towers of cardinality that of the continuum?

Is it obvious that $f\in \mathcal C^m([a,r])$ for all $r<b$ implies that $f\in \mathcal C^m([a,b))$?

Is $(0,1]$ compact in $\mathbb{R}$?

Zariski topology and product topology on $\mathbb A_k^m \times \mathbb A_k^n$

Several Questions on Smooth Urysohn's Lemma

Finite switching of balls between covering of a compact set

Explicit homeomorphism between $\mathbb{S^2}$ and $\mathbb{P^1(C)}$

How to show that $f : (0,\infty) \to \mathbb{R}^2$ given by $f(t)=(t , \sin(1/t))$ is continuous using open sets?

What about Union of connected sets?

The topology generated by $\mathcal{A}$ is minimal

What is known about the continuous image of an open set?

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