List questions from general-topology

Published on 11 Apr 2026 - 16:11

167

Views

Connectedness of matrix conjugacy classes of a fixed real $A$ but with the first column of $A$ invariant

Published on 25 Mar 2026 - 11:16

734

Views

Why unit circle is not diffeomorphic to the real line

Published on 11 Apr 2026 - 4:15

213

Views

Sequential compactness and boundedness

Published on 28 Mar 2026 - 23:11

152

Views

Is a subspace of a k-space is a k-space?

Published on 11 Apr 2026 - 4:26

72

Views

Show that $A$ or $B$ must be bounded in $\omega_1$

Published on 11 Apr 2026 - 6:28

505

Views

Embedding $S^1\times\cdots\times S^1$ into $\mathbb{R}^{k+1}$

Published on 08 Apr 2026 - 21:04

517

Views

Showing an isometry.

Published on 11 Apr 2026 - 10:54

311

Views

Examples for short exact sequences of real vector bundles that don't split.

Published on 25 Mar 2026 - 22:25

150

Views

Direction of path depends on sign of determinant of Jacobian

Published on 03 Apr 2026 - 9:53

155

Views

regular covers for spaces with abelian fundamental group

Published on 09 Apr 2026 - 22:51

67

Views

Why $p(t)=e^{2\pi it}$ is open?

Published on 20 Jul 2018 - 11:57

389

Views

Given $A\in\Bbb R^{n\times n}$, is $C_A := \{SAS^{-1} : S\in GL(n,\mathbb R)\}$ connected?

Published on 20 Jul 2018 - 12:14

73

Views

The Closedness in the hypothesis of Tietze extension theorem is necessary

Published on 11 Apr 2026 - 11:19

99

Views

local homeomorphism of the circle

Published on 20 Jul 2018 - 16:23

List Question

Assume that $C$ is a compact set and $p\in X\backslash C $.

Connectedness of matrix conjugacy classes of a fixed real $A$ but with the first column of $A$ invariant

Why unit circle is not diffeomorphic to the real line

Sequential compactness and boundedness

Is a subspace of a k-space is a k-space?

Show that $A$ or $B$ must be bounded in $\omega_1$

Embedding $S^1\times\cdots\times S^1$ into $\mathbb{R}^{k+1}$

Showing an isometry.

Examples for short exact sequences of real vector bundles that don't split.

Direction of path depends on sign of determinant of Jacobian

regular covers for spaces with abelian fundamental group

Why $p(t)=e^{2\pi it}$ is open?

Given $A\in\Bbb R^{n\times n}$, is $C_A := \{SAS^{-1} : S\in GL(n,\mathbb R)\}$ connected?

The Closedness in the hypothesis of Tietze extension theorem is necessary

local homeomorphism of the circle

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