Question

Is an order two homeomorphism of $S^{1}$ orientation reversing?

score 154 · Answer 1 · 2026-03-25 07:16:36

154

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Is an order two homeomorphism of $S^{1}$ orientation reversing?

Published on 25 Mar 2026 - 7:16

score 977 · Answer 2 · 2018-01-23 01:47:25

977

Views

$f$ is open iff $f(Int(A)) \subset Int(f(A))$

Published on 23 Jan 2018 - 1:47

score 411 · Answer 3 · 2026-03-25 07:15:34

411

Views

CW structure on the quotient of group action

Published on 25 Mar 2026 - 7:15

score 214 · Answer 4 · 2026-03-25 07:46:31

Let $M$ be a compact manifold of pos. dimension and let $p \in M$. Show that $M$ is homeomorphic to the one-pt compactification of $M \setminus \{p\}$

score 481 · Answer 5 · 2026-03-23 05:49:51

481

Views

Rudimentary results in iterated forcing.

Published on 23 Mar 2026 - 5:49

score 1.1k · Answer 6 · 2026-03-25 06:11:00

1.1k

Views

Definition of matrix Lie group

Published on 25 Mar 2026 - 6:11

score 1k · Answer 7 · 2026-03-23 02:45:04

1k

Views

Is it good to learn measure theory before topology or the other way around?

Published on 23 Mar 2026 - 2:45

score 52 · Answer 8 · 2026-03-27 02:04:58

52

Views

Interior is always open verification

Published on 27 Mar 2026 - 2:04

score 360 · Answer 9 · 2026-03-27 03:48:57

360

Views

Complement of a compact set in the Riemann sphere has countable many components.

Published on 27 Mar 2026 - 3:48

score 474 · Answer 10 · 2018-01-24 07:22:09

474

Views

If the intersection of nested intervals is a one-point set, can we conclude the diameters tend to zero?

Published on 24 Jan 2018 - 7:22

score 58 · Answer 11 · 2026-03-23 02:54:56

58

Views

The separation of the subset $[-1, 0) \cup (0,1)$ in $\mathbb{R}$ contains the limit point of the other

Published on 23 Mar 2026 - 2:54

score 447 · Answer 12 · 2026-03-24 02:49:18

447

Views

Questions from Forster's proof regarding unbranched holomorphic proper covering map

Published on 24 Mar 2026 - 2:49

score 326 · Answer 13 · 2026-03-27 03:44:08

326

Views

Is D = $\{ (x,y,z) \in \mathbb{R}^3 \vert x^2 + y^2 +z^2 = 1, 0 < z < 1 \}$ homeomorphic to $S^1$ and to $\mathbb{R}^2\setminus \{(0,0)\}$

Published on 27 Mar 2026 - 3:44

score 43 · Answer 14 · 2026-03-25 11:54:12

43

Views

Determine the group of automorphisms for a covering

Published on 25 Mar 2026 - 11:54

score 105 · Answer 15 · 2026-03-25 01:18:28

105

Views

Question on whether the Lebesgue measure of this set is strictly positive

Published on 25 Mar 2026 - 1:18

List Question

Is an order two homeomorphism of $S^{1}$ orientation reversing?

$f$ is open iff $f(Int(A)) \subset Int(f(A))$

CW structure on the quotient of group action

Let $M$ be a compact manifold of pos. dimension and let $p \in M$. Show that $M$ is homeomorphic to the one-pt compactification of $M \setminus \{p\}$

Rudimentary results in iterated forcing.

Definition of matrix Lie group

Is it good to learn measure theory before topology or the other way around?

Interior is always open verification

Complement of a compact set in the Riemann sphere has countable many components.

If the intersection of nested intervals is a one-point set, can we conclude the diameters tend to zero?

The separation of the subset $[-1, 0) \cup (0,1)$ in $\mathbb{R}$ contains the limit point of the other

Questions from Forster's proof regarding unbranched holomorphic proper covering map

Is D = $\{ (x,y,z) \in \mathbb{R}^3 \vert x^2 + y^2 +z^2 = 1, 0 < z < 1 \}$ homeomorphic to $S^1$ and to $\mathbb{R}^2\setminus \{(0,0)\}$

Determine the group of automorphisms for a covering

Question on whether the Lebesgue measure of this set is strictly positive

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