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step in proof Spivak about partition of unity

score 172 · Answer 1 · 2026-05-10 16:05:39

172

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step in proof Spivak about partition of unity

Published on 10 May 2026 - 16:05

score 93 · Answer 2 · 2026-04-13 15:39:16

93

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Spivak proof partition of unity: case 2 (countable compact sets)

Published on 13 Apr 2026 - 15:39

score 810 · Answer 3 · 2026-04-13 02:36:43

810

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Compactness in $l^\infty$

Published on 13 Apr 2026 - 2:36

score 362 · Answer 4 · 2026-04-10 03:56:04

362

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

Published on 10 Apr 2026 - 3:56

score 327 · Answer 5 · 2026-04-29 12:55:46

327

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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 29 Apr 2026 - 12:55

score 235 · Answer 6 · 2026-04-29 12:56:03

235

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Can any compact subset of $\mathbb{R}$ be represented as the intersection of closed line segments?

Published on 29 Apr 2026 - 12:56

score 310 · Answer 7 · 2026-04-29 12:56:17

310

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Definition of Compactness

Published on 29 Apr 2026 - 12:56

score 278 · Answer 8 · 2026-05-10 12:34:41

278

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Definition of the approximation property of a Banach space

Published on 10 May 2026 - 12:34

score 982 · Answer 9 · 2026-04-12 17:04:13

982

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Finite set implies sequentially compact

Published on 12 Apr 2026 - 17:04

score 312 · Answer 10 · 2026-05-10 17:46:09

312

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Characterization of Compactness in $\ell^\infty$

Published on 10 May 2026 - 17:46

score 194 · Answer 11 · 2026-05-11 09:33:59

194

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Is a compact set of distributions still compact if we fix the marginal distribution?

Published on 11 May 2026 - 9:33

score 444 · Answer 12 · 2026-05-10 12:36:08

444

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Quasi-components in compact space

Published on 10 May 2026 - 12:36

score 70 · Answer 13 · 2026-04-11 20:58:18

70

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How do I prove that the character equals to the psuedocharacter in compact Hausdroff spaces?

Published on 11 Apr 2026 - 20:58

score 567 · Answer 14 · 2026-05-11 08:34:35

567

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Can a compact connected set in $\mathbb{R}^n$ with empty interior have positive Lebesgue measure?

Published on 11 May 2026 - 8:34

score 455 · Answer 15 · 2026-04-29 12:55:54

455

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A comparison of compactness in Product Topology and Order Topology

Published on 29 Apr 2026 - 12:55

List Question

step in proof Spivak about partition of unity

Spivak proof partition of unity: case 2 (countable compact sets)

Compactness in $l^\infty$

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

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 $\mathbb{R}^2\setminus \{(0,0)\}$

Can any compact subset of $\mathbb{R}$ be represented as the intersection of closed line segments?

Definition of Compactness

Definition of the approximation property of a Banach space

Finite set implies sequentially compact

Characterization of Compactness in $\ell^\infty$

Is a compact set of distributions still compact if we fix the marginal distribution?

Quasi-components in compact space

How do I prove that the character equals to the psuedocharacter in compact Hausdroff spaces?

Can a compact connected set in $\mathbb{R}^n$ with empty interior have positive Lebesgue measure?

A comparison of compactness in Product Topology and Order Topology

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