Question

homeomorphism of the interior of an annulus on the plane and the whole plane without one point

score 172 · Answer 1 · 2018-01-21 11:10:20

172

Views

homeomorphism of the interior of an annulus on the plane and the whole plane without one point

Published on 21 Jan 2018 - 11:10

score 704 · Answer 2 · 2026-03-25 05:41:28

704

Views

Prove that the projection from a square to a torus is not open

Published on 25 Mar 2026 - 5:41

score 59 · Answer 3 · 2018-01-21 12:17:31

59

Views

Regular opens of compact Hausdorff space

Published on 21 Jan 2018 - 12:17

score 243 · Answer 4 · 2026-03-26 00:29:02

243

Views

When is the pointwise convergence on $A$ equivalent to the uniform one?

Published on 26 Mar 2026 - 0:29

score 1.1k · Answer 5 · 2018-01-21 13:27:21

1.1k

Views

The set of all invertible upper triangular matrices is open or not?

Published on 21 Jan 2018 - 13:27

score 106 · Answer 6 · 2018-01-21 13:40:01

106

Views

Prove that the set $\{(x,y): x=-y\}$ is open

Published on 21 Jan 2018 - 13:40

score 77 · Answer 7 · 2026-03-24 22:12:43

77

Views

"Any two codimension-zero balls in a connected manifold are isotopic"

Published on 24 Mar 2026 - 22:12

score 312 · Answer 8 · 2018-01-21 16:01:29

312

Views

A Question on the Topology Determined by a Neighborhood System

Published on 21 Jan 2018 - 16:01

score 1k · Answer 9 · 2026-03-26 01:57:25

1k

Views

Prove that the graph of continuous function f: $\mathbb{R}\rightarrow\mathbb{R}$ is a connected set

Published on 26 Mar 2026 - 1:57

score 577 · Answer 10 · 2026-03-24 22:11:50

577

Views

Why is smoothness defined only for functions on open sets?

Published on 24 Mar 2026 - 22:11

score 46 · Answer 11 · 2026-03-24 22:12:46

46

Views

Topology on a smooth manifold

Published on 24 Mar 2026 - 22:12

score 3.7k · Answer 12 · 2018-01-21 18:33:08

3.7k

Views

About covers, subcovers and compactness

Published on 21 Jan 2018 - 18:33

score 137 · Answer 13 · 2026-03-24 22:09:55

137

Views

Attracting set (Conley isolating neighborhoods) are closed

Published on 24 Mar 2026 - 22:09

score 351 · Answer 14 · 2026-03-22 03:28:47

351

Views

Does every locally compact subset of $\mathbb {R}^n$ have a one-point compactification on $\mathbb{S}^{n}$?

Published on 22 Mar 2026 - 3:28

score 295 · Answer 15 · 2026-03-23 00:15:48

295

Views

Proof of Existence of Quotient Topology

Published on 23 Mar 2026 - 0:15

List Question

homeomorphism of the interior of an annulus on the plane and the whole plane without one point

Prove that the projection from a square to a torus is not open

Regular opens of compact Hausdorff space

When is the pointwise convergence on $A$ equivalent to the uniform one?

The set of all invertible upper triangular matrices is open or not?

Prove that the set $\{(x,y): x=-y\}$ is open

"Any two codimension-zero balls in a connected manifold are isotopic"

A Question on the Topology Determined by a Neighborhood System

Prove that the graph of continuous function f: $\mathbb{R}\rightarrow\mathbb{R}$ is a connected set

Why is smoothness defined only for functions on open sets?

Topology on a smooth manifold

About covers, subcovers and compactness

Attracting set (Conley isolating neighborhoods) are closed

Does every locally compact subset of $\mathbb {R}^n$ have a one-point compactification on $\mathbb{S}^{n}$?

Proof of Existence of Quotient Topology

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