List questions from proof-explanation

Published on 30 Mar 2026 - 2:05

3.9k

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If $A$ is invertible and $A^n$ is diagonalizable, then $A$ is diagonalizable.

Published on 26 Mar 2026 - 9:41

87

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On Ramanujan's proof of Bertrand's postulate (using stirling formula)

Published on 26 Mar 2026 - 13:02

159

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Prove $\sum_{r=2}^n {n \choose r} r(r-1) = n(n-1)2^{n-2}$ for $n\geq 2$

Published on 06 Dec 2018 - 10:15

190

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Proof for Convergence of Nested Sequences

Published on 06 Dec 2018 - 17:28

401

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Spectrum of the product of two bounded operators

Published on 01 Apr 2026 - 5:05

546

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Proof of modulo property

Published on 30 Mar 2026 - 20:57

554

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There are arbitrary large singular cardinals $\aleph_\alpha$ such that $\aleph_\alpha=\alpha$

Published on 26 Mar 2026 - 3:11

44

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Associative property in a ring

Published on 08 Dec 2018 - 16:47

252

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Explanation of the Wolstenholme theorem proof

Published on 28 Mar 2026 - 10:35

145

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Doubts about Cantor's diagonal argument

Published on 09 Dec 2018 - 17:43

202

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Not understanding a proof about coherent sheaves on projective schemes in Hartshorne

Published on 25 Mar 2026 - 9:28

75

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How does $(x-y)^2 \geq 0$ imply $xy ≤ x^2/2 + y^2/2$?

Published on 10 Dec 2018 - 12:32

61

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A question about the ideals of a ring of power series.

Published on 25 Mar 2026 - 9:50

76

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Find a finite automaton such that the language accepted by it is the set of even numbers in binary notation

Published on 10 Dec 2018 - 18:05

List Question

Help with a proof by induction on polynomial roots

If $A$ is invertible and $A^n$ is diagonalizable, then $A$ is diagonalizable.

On Ramanujan's proof of Bertrand's postulate (using stirling formula)

Prove $\sum_{r=2}^n {n \choose r} r(r-1) = n(n-1)2^{n-2}$ for $n\geq 2$

Proof for Convergence of Nested Sequences

Spectrum of the product of two bounded operators

Proof of modulo property

There are arbitrary large singular cardinals $\aleph_\alpha$ such that $\aleph_\alpha=\alpha$

Associative property in a ring

Explanation of the Wolstenholme theorem proof

Doubts about Cantor's diagonal argument

Not understanding a proof about coherent sheaves on projective schemes in Hartshorne

How does $(x-y)^2 \geq 0$ imply $xy ≤ x^2/2 + y^2/2$?

A question about the ideals of a ring of power series.

Find a finite automaton such that the language accepted by it is the set of even numbers in binary notation

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