Question

Intuition behind the $cl(cl(A))=cl(A)$ Kuratowski closure axiom in general topology?

score 196 · Answer 1 · 2019-02-07 10:07:26

196

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Intuition behind the $cl(cl(A))=cl(A)$ Kuratowski closure axiom in general topology?

Published on 07 Feb 2019 - 10:07

score 1k · Answer 2 · 2019-02-07 13:12:59

1k

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Intuition of Euclidean norm

Published on 07 Feb 2019 - 13:12

score 122 · Answer 3 · 2026-03-28 06:40:41

122

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Stable and unstable manifolds that are tangent to each other in a continuous dynamical system?

Published on 28 Mar 2026 - 6:40

score 51 · Answer 4 · 2019-02-08 18:39:00

51

Views

If $^{t\mkern-5mu}A A = I_k$ in which way should I think about : $A\, ^{t\mkern-5mu}A$

Published on 08 Feb 2019 - 18:39

score 510 · Answer 5 · 2019-02-10 21:30:43

510

Views

Can someone please explain Prufer's sequence?

Published on 10 Feb 2019 - 21:30

score 40 · Answer 6 · 2026-03-26 02:52:35

40

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What does the set : $\{ (\lambda_1, ..., \lambda_n) \in \mathbb{R}_+^n \mid \sum \lambda_i = 1 \}$ represent

Published on 26 Mar 2026 - 2:52

score 73 · Answer 7 · 2019-02-13 10:00:55

73

Views

Intuition for a limit found using L'Hôpital (geometry)

Published on 13 Feb 2019 - 10:00

score 382 · Answer 8 · 2026-03-26 12:07:00

382

Views

Why is $U ^tU $ an orthogonal projection on $\operatorname{Im}(U)$?

Published on 26 Mar 2026 - 12:07

score 145 · Answer 9 · 2019-02-13 22:22:33

145

Views

Intuition behind $ ||x|-|y|| \leq |x-y| $

Published on 13 Feb 2019 - 22:22

score 115 · Answer 10 · 2026-03-28 10:04:29

115

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Intuition behind a counterexample to $|A+A|\leq |A-A|$, where $A$ is a finite set

Published on 28 Mar 2026 - 10:04

score 422 · Answer 11 · 2026-03-26 01:06:12

422

Views

Why are principal crossed homomorphisms coboundaries?

Published on 26 Mar 2026 - 1:06

score 1.7k · Answer 12 · 2019-02-16 06:39:03

1.7k

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U-Substitution Intuition

Published on 16 Feb 2019 - 6:39

score 383 · Answer 13 · 2019-02-17 19:18:01

383

Views

Prove that there exists no surjection between $X\rightarrow P(X)$ -Proof question

Published on 17 Feb 2019 - 19:18

score 428 · Answer 14 · 2026-03-25 09:47:06

428

Views

Category with colimits but no limits

Published on 25 Mar 2026 - 9:47

score 327 · Answer 15 · 2019-02-19 10:06:00

327

Views

Proof of a formula to calculate $1^p+2^p+...+n^p$ for arbitrary $n,p\in\mathbb{N}$

Published on 19 Feb 2019 - 10:06

List Question

Intuition behind the $cl(cl(A))=cl(A)$ Kuratowski closure axiom in general topology?

Intuition of Euclidean norm

Stable and unstable manifolds that are tangent to each other in a continuous dynamical system?

If $^{t\mkern-5mu}A A = I_k$ in which way should I think about : $A\, ^{t\mkern-5mu}A$

Can someone please explain Prufer's sequence?

What does the set : $\{ (\lambda_1, ..., \lambda_n) \in \mathbb{R}_+^n \mid \sum \lambda_i = 1 \}$ represent

Intuition for a limit found using L'Hôpital (geometry)

Why is $U ^tU $ an orthogonal projection on $\operatorname{Im}(U)$?

Intuition behind $ ||x|-|y|| \leq |x-y| $

Intuition behind a counterexample to $|A+A|\leq |A-A|$, where $A$ is a finite set

Why are principal crossed homomorphisms coboundaries?

U-Substitution Intuition

Prove that there exists no surjection between $X\rightarrow P(X)$ -Proof question

Category with colimits but no limits

Proof of a formula to calculate $1^p+2^p+...+n^p$ for arbitrary $n,p\in\mathbb{N}$

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