List questions from solution-verification

Published on 07 Jan 2020 - 6:56

499

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Verifying my proposed proof: If $(G:H)=m$, the order of every element of $G/H$ is a divisor of $m$

Published on 26 Mar 2026 - 9:18

186

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A positive-definite binary quadratic form represents an odd prime $p$ if and only if $p \equiv 1 \pmod 4$.

Published on 07 Jan 2020 - 8:18

268

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Prop: Let $E'$ be the set of all limit points of $E$. Then, $E'$ is closed.

Published on 07 Jan 2020 - 8:41

1k

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Proving the existence of a line that passes only through two points

Published on 07 Jan 2020 - 11:55

47

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Prove that $\exists y \in \mathbb{R}: \forall x \in \mathbb{R} : x+y =0$ is not correct

Published on 07 Jan 2020 - 12:56

49

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Is this proof about Inverse function Theorem okay?

Published on 25 Mar 2026 - 17:34

89

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Numbers 'poetics' 1 and 2019

Published on 07 Jan 2020 - 16:23

94

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Is this solution correct for equation $3x^2-4y^2=13$?

Published on 07 Jan 2020 - 18:29

68

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If $f$ is continuous on $\Bbb R$ and uniformly continuous on every $(a,b)$ so it also uniformly continuous on $\Bbb R$

Published on 07 Jan 2020 - 21:32

90

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Proof verification, show that $f=g$.

Published on 08 Jan 2020 - 6:27

60

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Coset representatives of a subgroup

Published on 29 Mar 2026 - 17:43

189

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Socle of $\mathbb{Z}/16\mathbb{Z}\oplus \mathbb{Z}/25\mathbb{Z}$.

Published on 08 Jan 2020 - 8:37

146

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distortion of Riemann Integrable function at finite number of points makes it Riemann Integrable again

Published on 29 Mar 2026 - 15:03

131

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Prove/Disprove that $B \subset f(f^{-1}(B))$

Published on 08 Jan 2020 - 11:19

List Question

Proof of Domination Theorem

Verifying my proposed proof: If $(G:H)=m$, the order of every element of $G/H$ is a divisor of $m$

A positive-definite binary quadratic form represents an odd prime $p$ if and only if $p \equiv 1 \pmod 4$.

Prop: Let $E'$ be the set of all limit points of $E$. Then, $E'$ is closed.

Proving the existence of a line that passes only through two points

Prove that $\exists y \in \mathbb{R}: \forall x \in \mathbb{R} : x+y =0$ is not correct

Is this proof about Inverse function Theorem okay?

Numbers 'poetics' 1 and 2019

Is this solution correct for equation $3x^2-4y^2=13$?

If $f$ is continuous on $\Bbb R$ and uniformly continuous on every $(a,b)$ so it also uniformly continuous on $\Bbb R$

Proof verification, show that $f=g$.

Coset representatives of a subgroup

Socle of $\mathbb{Z}/16\mathbb{Z}\oplus \mathbb{Z}/25\mathbb{Z}$.

distortion of Riemann Integrable function at finite number of points makes it Riemann Integrable again

Prove/Disprove that $B \subset f(f^{-1}(B))$

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