List questions from proof-explanation

Published on 07 Mar 2018 - 9:19

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Prove a tautology with contradiction theory and boolean algebra

Published on 26 Mar 2026 - 12:35

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If $(g,h)\in G\times H$ with $|g|=r$ and $|h|=s$, then $|(g,h)|=\operatorname{lcm}(r,s)$.

Published on 23 Mar 2026 - 0:19

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Prove $3^{2n}-5$ is a multiple of $4$

Published on 26 Mar 2026 - 5:54

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Fill gaps in a topology proof

Published on 27 Mar 2026 - 7:30

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Given a sequence of functions $\{f_n\}$, $|f_n(x)|<\infty$ a.e. x. Why does the measure $m\{x\in [0,1]: |f_n(x)| \geq 1\}\leq 1$

Published on 07 Mar 2018 - 23:20

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Advanced linear algebra

Published on 08 Mar 2018 - 3:33

641

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The three circles theorem

Published on 08 Mar 2018 - 15:09

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Proving whether a given function involving power sets is injective or surjective

Published on 08 Mar 2018 - 23:25

316

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Why is $\oint_{C_{r_{0}}} \mathbf{v} \cdot \mathbf{r}' \mathrm ds$ called the circulation of the flow around $C_{r_{0}}$?

Published on 27 Mar 2026 - 8:44

40

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Is there significance to the maximum curvature of a Cartesian function?

Published on 25 Mar 2026 - 3:02

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How to derive this Combinatorial identity

Published on 26 Mar 2026 - 20:38

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Suppose $T : \mathbb R ^ n \to \mathbb R ^ n$ is a linear map which satisfies $T ^ k = O$ for some positive integer $k$. Show that $T ^ n = O$

Published on 10 Mar 2018 - 6:17

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Proof of Upward Lowenheim-Skolem Theorem

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$\exists g\in G: H\cap gPg^{-1}$ is a Sylow $p-$subgroup of $H$

Published on 25 Mar 2026 - 4:41

List Question

Homology group in Hatcher

Prove a tautology with contradiction theory and boolean algebra

If $(g,h)\in G\times H$ with $|g|=r$ and $|h|=s$, then $|(g,h)|=\operatorname{lcm}(r,s)$.

Prove $3^{2n}-5$ is a multiple of $4$

Fill gaps in a topology proof

Given a sequence of functions $\{f_n\}$, $|f_n(x)|<\infty$ a.e. x. Why does the measure $m\{x\in [0,1]: |f_n(x)| \geq 1\}\leq 1$

Advanced linear algebra

The three circles theorem

Proving whether a given function involving power sets is injective or surjective

Why is $\oint_{C_{r_{0}}} \mathbf{v} \cdot \mathbf{r}' \mathrm ds$ called the circulation of the flow around $C_{r_{0}}$?

Is there significance to the maximum curvature of a Cartesian function?

How to derive this Combinatorial identity

Suppose $T : \mathbb R ^ n \to \mathbb R ^ n$ is a linear map which satisfies $T ^ k = O$ for some positive integer $k$. Show that $T ^ n = O$

Proof of Upward Lowenheim-Skolem Theorem

$\exists g\in G: H\cap gPg^{-1}$ is a Sylow $p-$subgroup of $H$

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