List questions from proof-explanation

Published on 26 Mar 2026 - 17:52

74

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Rudin's functional analysis, theorem 4.1.(completeness of $\mathcal{B}(X,Y)$)

Published on 26 Mar 2026 - 12:35

35

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On the characterization of discs in dimension $\ge 6$

Published on 30 Mar 2026 - 5:37

399

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How to prove that there exist exactly two non-similar isosceles triangles ABC such that tanA+tanB+tanC=100?

Published on 25 Mar 2026 - 15:42

181

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Can someone please explain the map $S:C_n(X) \to C_n(X)$ from Hatcher's AT page 122?

Published on 31 Mar 2026 - 20:29

144

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Equivalent conditions involving (co)primary module (Proposition 3.9 from Eisenbud)

Published on 26 Mar 2026 - 14:20

723

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$\sup(c+A) = c + \sup A$

Published on 28 Mar 2026 - 3:00

137

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Showing that $p$ is an odd prime $\iff$ $\forall a \in \Bbb N$ $gcd(a,p)=1$ or $gcd(a,p)=p$

Published on 03 Apr 2026 - 23:04

35

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How do I prove that for any $y$ $\in$ $B$, $y$ $\in$ $f$($A$)?

Published on 07 Mar 2019 - 12:24

203

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Prove that if a sequence $(x_i)$ does not converge to $a$ in a metric space, there exists neighborhood of $a$

Published on 07 Mar 2019 - 14:19

89

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Understanding a formula from Stewart's "Calculus: Early Transcendentals" on related rates

Published on 07 Mar 2019 - 21:03

261

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Prove that a continuous function from a compact metric space to any metric space is closed.

Published on 07 Mar 2019 - 21:30

40

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Basic algebra simplying/factoring question.

Published on 29 Mar 2026 - 6:00

126

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Prove $(\lnot p \to p) \to p$ in 19 steps

Published on 27 Mar 2026 - 21:20

128

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Rudin functional analysis, theorem 4.9 part (b)

Published on 25 Mar 2026 - 22:09

List Question

Understanding a technique mentioned in 2016 IMO Shortlist

Rudin's functional analysis, theorem 4.1.(completeness of $\mathcal{B}(X,Y)$)

On the characterization of discs in dimension $\ge 6$

How to prove that there exist exactly two non-similar isosceles triangles ABC such that tanA+tanB+tanC=100?

Can someone please explain the map $S:C_n(X) \to C_n(X)$ from Hatcher's AT page 122?

Equivalent conditions involving (co)primary module (Proposition 3.9 from Eisenbud)

$\sup(c+A) = c + \sup A$

Showing that $p$ is an odd prime $\iff$ $\forall a \in \Bbb N$ $gcd(a,p)=1$ or $gcd(a,p)=p$

How do I prove that for any $y$ $\in$ $B$, $y$ $\in$ $f$($A$)?

Prove that if a sequence $(x_i)$ does not converge to $a$ in a metric space, there exists neighborhood of $a$

Understanding a formula from Stewart's "Calculus: Early Transcendentals" on related rates

Prove that a continuous function from a compact metric space to any metric space is closed.

Basic algebra simplying/factoring question.

Prove $(\lnot p \to p) \to p$ in 19 steps

Rudin functional analysis, theorem 4.9 part (b)

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