Question

Does the open cover of a compact always contain an r-neighborhood of the compact

score 54 · Answer 1 · 2026-04-12 13:09:48

54

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Does the open cover of a compact always contain an r-neighborhood of the compact

Published on 12 Apr 2026 - 13:09

score 106 · Answer 2 · 2026-04-15 11:34:05

106

Views

prove: $\mathrm|{A}|=|\cup_{n\in\mathbb{N^{\mathrm{+}}}}\mathrm{A}^{n}|$ when $\mathrm{|A|\geq|A\times A|}$

Published on 15 Apr 2026 - 11:34

score 185 · Answer 3 · 2026-04-14 11:43:08

185

Views

$A$ and $B$ closed in $\Bbb R^2$ but neither is compact

Published on 14 Apr 2026 - 11:43

score 164 · Answer 4 · 2026-04-12 07:12:25

164

Views

Can I Systematically Determine the Cardinality of a Finite Set?

Published on 12 Apr 2026 - 7:12

score 191 · Answer 5 · 2026-04-15 10:26:36

191

Views

Prove that $Z-(Y-X)=X\cup(Z-Y)$ if $X\subset Y\subset Z$

Published on 15 Apr 2026 - 10:26

score 86 · Answer 6 · 2026-04-12 00:30:44

86

Views

Digraph continuity vs topological continuity

Published on 12 Apr 2026 - 0:30

score 202 · Answer 7 · 2026-04-10 23:31:09

202

Views

Closed subset with measure arbitrarily close to original set

Published on 10 Apr 2026 - 23:31

score 60 · Answer 8 · 2026-04-14 02:22:19

60

Views

$f(x)=h$, is it valid to write $h\in f(x)$

Published on 14 Apr 2026 - 2:22

score 73 · Answer 9 · 2026-04-14 15:48:52

$\mathcal{R}$ is a relation and $|A'|\leq|h(A')|$ for all $A'\subseteq A\implies \exists$ an injection $f:A\to B$ such that $f\subseteq\mathcal{R}$.

score 347 · Answer 10 · 2026-04-15 10:24:33

347

Views

The set of all digits in a real number

Published on 15 Apr 2026 - 10:24

score 254 · Answer 11 · 2026-04-12 00:49:15

254

Views

Are probability measures induced by random variables always regular?

Published on 12 Apr 2026 - 0:49

score 122 · Answer 12 · 2026-04-16 05:42:29

122

Views

Cardinality of a subset of $A$ without elements $x = 2y$

Published on 16 Apr 2026 - 5:42

score 70 · Answer 13 · 2026-04-20 09:20:49

70

Views

Family over a set such that the union is the set

Published on 20 Apr 2026 - 9:20

score 43 · Answer 14 · 2026-04-13 21:41:49

43

Views

Is this valid syntax for constraining nested tuples within a set?

Published on 13 Apr 2026 - 21:41

score 84 · Answer 15 · 2026-04-15 20:28:01

84

Views

Cardinality-wise, Is the amount of possible relations of x and y greater than or equal to the amount of possible functions of x?

Published on 15 Apr 2026 - 20:28

List Question

Does the open cover of a compact always contain an r-neighborhood of the compact

prove: $\mathrm|{A}|=|\cup_{n\in\mathbb{N^{\mathrm{+}}}}\mathrm{A}^{n}|$ when $\mathrm{|A|\geq|A\times A|}$

$A$ and $B$ closed in $\Bbb R^2$ but neither is compact

Can I Systematically Determine the Cardinality of a Finite Set?

Prove that $Z-(Y-X)=X\cup(Z-Y)$ if $X\subset Y\subset Z$

Digraph continuity vs topological continuity

Closed subset with measure arbitrarily close to original set

$f(x)=h$, is it valid to write $h\in f(x)$

$\mathcal{R}$ is a relation and $|A'|\leq|h(A')|$ for all $A'\subseteq A\implies \exists$ an injection $f:A\to B$ such that $f\subseteq\mathcal{R}$.

The set of all digits in a real number

Are probability measures induced by random variables always regular?

Cardinality of a subset of $A$ without elements $x = 2y$

Family over a set such that the union is the set

Is this valid syntax for constraining nested tuples within a set?

Cardinality-wise, Is the amount of possible relations of x and y greater than or equal to the amount of possible functions of x?

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