List questions from compactness

30

Views

Check for compactness of subsets $A =\{(x, y) :xy = 1\}$ $B =\{(x, y) :x^2y^2 = 1\}$ of $\mathbb{R}^2$.

Published on 12 Aug 2023 - 14:04

73

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Are the partial derivatives of any order n and below of a continuously differentiable function of order n with a compact supported set bounded?

Published on 02 Apr 2026 - 9:24

107

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Compact objects in the category of $n$-categories

Published on 29 Mar 2026 - 12:04

145

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(Path) connected components of zero-sets of limiting functions.

Published on 08 Apr 2026 - 17:23

85

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An infinite set is compact if its infinite subset has a limit point in it.

Published on 23 Aug 2023 - 0:15

37

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accumulation point and sequentially compact

Published on 23 Aug 2023 - 11:04

120

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Are there no intersection points?

Published on 08 Apr 2026 - 17:02

78

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Closedness in a Skorokhod space

Published on 23 Feb 2026 - 9:14

72

Views

Wallace's theorem proof

Published on 24 Aug 2023 - 13:02

65

Views

Compactness nilpotent operator

Published on 08 Apr 2026 - 19:15

215

Views

Does locally compact, locally connected, connected metrizable space admit a metric with connected balls?

Published on 09 Apr 2026 - 6:17

254

Views

If $B$ is compact, then $\{x\}\times B$ is compact

Published on 27 Aug 2023 - 22:38

45

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When is the "flat limit" of a submanifold not a submanifold?

Published on 25 Mar 2026 - 23:16

266

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How are k-Hausdorff and weakly Hausdorff distinct?

Published on 26 Mar 2026 - 17:32

57

Views

Convergence in Skorohod J1 topology when jumps collapse

Published on 23 Feb 2026 - 9:09

List Question

Check for compactness of subsets $A =\{(x, y) :xy = 1\}$ $B =\{(x, y) :x^2y^2 = 1\}$ of $\mathbb{R}^2$.

Are the partial derivatives of any order n and below of a continuously differentiable function of order n with a compact supported set bounded?

Compact objects in the category of $n$-categories

(Path) connected components of zero-sets of limiting functions.

An infinite set is compact if its infinite subset has a limit point in it.

accumulation point and sequentially compact

Are there no intersection points?

Closedness in a Skorokhod space

Wallace's theorem proof

Compactness nilpotent operator

Does locally compact, locally connected, connected metrizable space admit a metric with connected balls?

If $B$ is compact, then $\{x\}\times B$ is compact

When is the "flat limit" of a submanifold not a submanifold?

How are k-Hausdorff and weakly Hausdorff distinct?

Convergence in Skorohod J1 topology when jumps collapse

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