List questions from proof-explanation

Published on 13 Apr 2026 - 4:20

140

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How can $\text{deg }(f)= \text{d }(f) $ if they're defined differently?

Published on 16 Apr 2026 - 13:43

863

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Olympiad number theory question

Published on 11 Apr 2026 - 5:49

146

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Assumption about the convergence of Riemann Sums in Sub-Interval Theorem Proof

Published on 12 Apr 2026 - 22:21

47

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How to show the equivalence between full row rank of $A$ and the column space of $A$ being equal to $\mathbb{R}^m$?

Published on 15 Apr 2026 - 2:11

295

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Two doubts about proof of Doob's Martingale Inequalities Theorem on Jacod-Protter

Published on 14 Apr 2026 - 12:02

42

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Existence of a state $\varphi$ over $\mathbb{B}(\mathcal{H})$

Published on 17 Apr 2026 - 8:20

143

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Question on proof of Jensen's inequality - $E[\phi(X)] \ge \phi(E[X])$, where $\phi$ is convex

Published on 15 Apr 2026 - 0:09

95

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Question about the proof of Tietze extenstion theorem

Published on 11 Apr 2026 - 0:03

213

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AIME 1991 Number theory Problem

Published on 11 Apr 2026 - 22:24

248

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$\displaystyle{\limsup_{x \to \infty} f(x) = L = \liminf_{x \to \infty} f(x)}$ proof

Published on 15 Apr 2026 - 6:55

61

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If $f: U \to \mathbb{C}$ is holomorphic and $h: f(U) \to \mathbb{R}$ is harmonic, then $h \circ f: U \to \mathbb{R}$ is harmonic.

Published on 14 Apr 2026 - 8:45

88

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Analytic Continuation proof questions

Published on 09 Apr 2026 - 6:25

321

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On the proof of classification of finitely generated abelian groups

Published on 09 Apr 2026 - 19:18

41

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Where is the contradiction in this fixed points proof?

Published on 14 Apr 2026 - 12:31

List Question

Pythagorean theorem by contradiction

How can $\text{deg }(f)= \text{d }(f) $ if they're defined differently?

Olympiad number theory question

Assumption about the convergence of Riemann Sums in Sub-Interval Theorem Proof

How to show the equivalence between full row rank of $A$ and the column space of $A$ being equal to $\mathbb{R}^m$?

Two doubts about proof of Doob's Martingale Inequalities Theorem on Jacod-Protter

Existence of a state $\varphi$ over $\mathbb{B}(\mathcal{H})$

Question on proof of Jensen's inequality - $E[\phi(X)] \ge \phi(E[X])$, where $\phi$ is convex

Question about the proof of Tietze extenstion theorem

AIME 1991 Number theory Problem

$\displaystyle{\limsup_{x \to \infty} f(x) = L = \liminf_{x \to \infty} f(x)}$ proof

If $f: U \to \mathbb{C}$ is holomorphic and $h: f(U) \to \mathbb{R}$ is harmonic, then $h \circ f: U \to \mathbb{R}$ is harmonic.

Analytic Continuation proof questions

On the proof of classification of finitely generated abelian groups

Where is the contradiction in this fixed points proof?

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