List questions from proof-writing

Published on 10 Apr 2026 - 6:20

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Prove inequality for enough big numbers

Published on 12 Apr 2026 - 17:45

1.8k

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Given the vectors u, v, w in a vector space V, prove that Span{u, v, w} = Span{u+v, v+w, w+u}

Published on 16 Apr 2026 - 8:53

143

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If $A$ is a connected set, then its closure $A'$ is connected.

Published on 14 Apr 2026 - 15:09

32

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Proving supremum through continuity/limit arguments

Published on 14 Apr 2026 - 11:09

83

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Is this proof of the Cantor–Bernstein theorem I wrote valid? Or did I make a mistake somewhere?

Published on 14 Apr 2026 - 19:41

48

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Supremum Proof:

Published on 21 Apr 2026 - 15:16

264

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Proving arc length polar coordinate formula

Published on 10 Apr 2026 - 17:41

91

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$f(a)=g(a)$ for $a$ in a dense set implies $f(x)=g(x)$.

Published on 21 Apr 2026 - 15:32

1.3k

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Prove that $\lim_{x \to 0^+} \sin(\frac{1}{x})$ does not exist

Published on 21 Apr 2026 - 15:31

81

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Prove that if it is possible to divide the software engineers into two teams

Published on 21 Apr 2026 - 15:29

719

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Considering sets in proofs

Published on 13 Apr 2026 - 13:42

494

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Is it correct that $\lim_{n\to\infty} n(a_n^{1/n}-1)=\lim_{n\to\infty}\log a_n$?

Published on 17 Apr 2026 - 5:06

360

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Problem in proof of -"A net has $y$ as a cluster point iff it has a subnet which converges to $y$"

Published on 16 Apr 2026 - 23:14

91

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Let us have $2n+1$ intervals on the real line

Published on 21 Apr 2026 - 20:19

List Question

How to continue this proof about image of composite relation?

Prove inequality for enough big numbers

Given the vectors u, v, w in a vector space V, prove that Span{u, v, w} = Span{u+v, v+w, w+u}

If $A$ is a connected set, then its closure $A'$ is connected.

Proving supremum through continuity/limit arguments

Is this proof of the Cantor–Bernstein theorem I wrote valid? Or did I make a mistake somewhere?

Supremum Proof:

Proving arc length polar coordinate formula

$f(a)=g(a)$ for $a$ in a dense set implies $f(x)=g(x)$.

Prove that $\lim_{x \to 0^+} \sin(\frac{1}{x})$ does not exist

Prove that if it is possible to divide the software engineers into two teams

Considering sets in proofs

Is it correct that $\lim_{n\to\infty} n(a_n^{1/n}-1)=\lim_{n\to\infty}\log a_n$?

Problem in proof of -"A net has $y$ as a cluster point iff it has a subnet which converges to $y$"

Let us have $2n+1$ intervals on the real line

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