List questions from alternative-proof

Published on 05 May 2018 - 16:38

783

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If a sequence is Cauchy then its diameter converges to zero?

Published on 05 May 2018 - 23:23

3.4k

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Prove cut-vertex $v$ in $G$ is not cut-vertex in $\overline G$

Published on 07 May 2018 - 3:12

189

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Is this statement really that technical to prove?

Published on 25 Mar 2026 - 4:35

263

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Geometric derivation of polar arc length and area

Published on 09 May 2018 - 15:57

100

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Suppose $a,b,c,$ and $d$ are real numbers, $0 \lt a \lt b $, and $d \gt 0$. Prove that if $ac \ge bd$ then $c \gt d$

Published on 24 Mar 2026 - 22:07

183

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Compute $\sum_{n=1}^{\infty}\frac{1}{n^4}$ using Parseval identity

Published on 12 May 2018 - 1:52

475

Views

Proving $\sqrt[3]{2}$ is irrational without using prime factorization

Published on 25 Mar 2026 - 9:22

378

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Visual proof of isosceles base-angle congruency?

Published on 24 Mar 2026 - 22:08

101

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How to find subgroups, is my method correct , and if so what is another method for doing so?

Published on 13 May 2018 - 19:14

3.1k

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Is it possible to shorten the solution for this 2014 RMO question?

Published on 14 May 2018 - 10:45

156

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Where is $ze^{\overline{z}}$ differentiable?

Published on 15 May 2018 - 4:40

35

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if $x\le y+z$ for every $z>0$ then $x\le y$

Published on 15 May 2018 - 18:40

103

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Show that if $g(s+t)=g(s)+g(t)$ and $g$ is bounded in bounded sets then $g(x)=xg(1)$

Published on 16 May 2018 - 11:31

654

Views

Proof Help: Proving that limit exists and equals the derivative

Published on 16 May 2018 - 19:26

List Question

Showing a set is closed other than giving a counterexample?

If a sequence is Cauchy then its diameter converges to zero?

Prove cut-vertex $v$ in $G$ is not cut-vertex in $\overline G$

Is this statement really that technical to prove?

Geometric derivation of polar arc length and area

Suppose $a,b,c,$ and $d$ are real numbers, $0 \lt a \lt b $, and $d \gt 0$. Prove that if $ac \ge bd$ then $c \gt d$

Compute $\sum_{n=1}^{\infty}\frac{1}{n^4}$ using Parseval identity

Proving $\sqrt[3]{2}$ is irrational without using prime factorization

Visual proof of isosceles base-angle congruency?

How to find subgroups, is my method correct , and if so what is another method for doing so?

Is it possible to shorten the solution for this 2014 RMO question?

Where is $ze^{\overline{z}}$ differentiable?

if $x\le y+z$ for every $z>0$ then $x\le y$

Show that if $g(s+t)=g(s)+g(t)$ and $g$ is bounded in bounded sets then $g(x)=xg(1)$

Proof Help: Proving that limit exists and equals the derivative

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