List questions from alternative-proof

Published on 26 Feb 2020 - 22:43

156

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Find all numbers $n$ that consist of three digits, so that $n^2$ satisfies two specified conditions

Published on 01 Apr 2026 - 16:25

170

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Proof of converse of Pythagoras theorem

Published on 26 Mar 2026 - 14:20

88

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Show $\| (A - \lambda I)^{-1} \| \le | \Im(\lambda) |^{-1}$, $\lambda \in \mathbb C \setminus \mathbb R$ WITHOUT functional calculus

Published on 23 Feb 2026 - 8:29

100

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Is there a way to prove that there are infinite primes ending in 777?

Published on 02 Mar 2020 - 20:06

679

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Two parabolas, perpendicular axes: Can we prove the intersection points are concyclic?

Published on 03 Mar 2020 - 10:30

76

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Another way of proving L'Hopital

Published on 04 Mar 2020 - 9:50

29

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Can we save this proof of a resolvent bound without using the (continuous) functional calculus?

Published on 29 Mar 2026 - 15:14

34

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Locus of a point when a line varies

Published on 26 Mar 2026 - 4:51

231

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Product of cosine function identity

Published on 30 Mar 2026 - 6:08

63

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function differentiability of $g(x)=|f(x)|$

Published on 08 Mar 2020 - 18:11

277

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Maximal principles

Published on 31 Mar 2026 - 23:11

288

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How to alternatively prove: Any subgroup of any free Abelian group is free

Published on 26 Mar 2026 - 6:34

197

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Alternative proof to Theorem 2.37 in Baby Rudin

Published on 09 Mar 2020 - 23:39

118

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Is there a constructive proof of this characterisation of convergence of sequences?

Published on 26 Mar 2026 - 5:55

List Question

Number of real solutions for $f(x)=0$

Find all numbers $n$ that consist of three digits, so that $n^2$ satisfies two specified conditions

Proof of converse of Pythagoras theorem

Show $\| (A - \lambda I)^{-1} \| \le | \Im(\lambda) |^{-1}$, $\lambda \in \mathbb C \setminus \mathbb R$ WITHOUT functional calculus

Is there a way to prove that there are infinite primes ending in 777?

Two parabolas, perpendicular axes: Can we prove the intersection points are concyclic?

Another way of proving L'Hopital

Can we save this proof of a resolvent bound without using the (continuous) functional calculus?

Locus of a point when a line varies

Product of cosine function identity

function differentiability of $g(x)=|f(x)|$

Maximal principles

How to alternatively prove: Any subgroup of any free Abelian group is free

Alternative proof to Theorem 2.37 in Baby Rudin

Is there a constructive proof of this characterisation of convergence of sequences?

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