List questions from proof-verification

Published on 15 Apr 2026 - 0:04

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"Quick" proof of the fundamental lemma of calculus of variations

Published on 12 Apr 2026 - 13:24

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Show $T$ is an invertible linear map iff $\operatorname{rank} T = \dim V$

Published on 11 May 2026 - 8:01

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Proof of even numbers

Published on 10 Apr 2026 - 1:04

107

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Left and Right inverses - Proof by contradiction

Published on 14 Apr 2026 - 9:42

65

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Proof that for any real number $x$, $-|x| \leq x \leq |x|$. Is my proof too good to be true?

Published on 16 Apr 2026 - 9:53

84

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$e^x \neq 0$ Proof Correctness

Published on 12 Apr 2026 - 18:37

94

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Finding an error in proof for an axiom of a vector space

Published on 11 Apr 2026 - 21:42

24

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Solve equation for $x$, why not a closed format?

Published on 14 Apr 2026 - 11:39

173

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Prove proposition on integers using axioms

Published on 09 Apr 2026 - 10:50

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Reverse of Jensen's Inequality

Published on 10 May 2026 - 17:48

416

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$\sum |a_n|<\infty$ and $|\sum b_n|<\infty$ implies $|\sum a_n b_n| <\infty$

Published on 11 May 2026 - 6:36

60

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Schroder-Bernstein Theorem using AC

Published on 29 Apr 2026 - 22:08

277

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On exercise 14H from Willard's 'General Topology' book

Published on 11 May 2026 - 4:06

45

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How do I prove this equation by mathematical induction?

Published on 09 Apr 2026 - 10:09

List Question

Number of routes between two towns

"Quick" proof of the fundamental lemma of calculus of variations

Show $T$ is an invertible linear map iff $\operatorname{rank} T = \dim V$

Proof of even numbers

Left and Right inverses - Proof by contradiction

Proof that for any real number $x$, $-|x| \leq x \leq |x|$. Is my proof too good to be true?

$e^x \neq 0$ Proof Correctness

Finding an error in proof for an axiom of a vector space

Solve equation for $x$, why not a closed format?

Prove proposition on integers using axioms

Reverse of Jensen's Inequality

$\sum |a_n|<\infty$ and $|\sum b_n|<\infty$ implies $|\sum a_n b_n| <\infty$

Schroder-Bernstein Theorem using AC

On exercise 14H from Willard's 'General Topology' book

How do I prove this equation by mathematical induction?

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