List questions from proof-explanation

Published on 14 Apr 2026 - 14:48

53

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Show that $X= \ker((u-\lambda)^p) \oplus (u-\lambda)^p(X)$ if $u$ is compact.

Published on 15 Apr 2026 - 6:13

150

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Understanding Lang's proof that every closed and bounded set is compact

Published on 13 Apr 2026 - 6:21

1.6k

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Proof that a closed set contains all the limit points

Published on 13 Apr 2026 - 3:13

43

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Why are the sets $G_{\alpha}$ open relative to $X$ in the given proof?

Published on 16 Apr 2026 - 14:51

121

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Number theory question from 2017 MO

Published on 15 Apr 2026 - 10:54

766

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How to prove that supremum of strictly convex function is infinity?

Published on 12 Apr 2026 - 5:10

452

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Baby Rudin Ch. 5 Exercise 2: How does differentiability imply continuity at endpoints?

Published on 01 May 2026 - 12:54

48

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A question concerning a proof of a theorem. Harmonic Analysis

Published on 10 Apr 2026 - 13:24

439

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IMO $2001$ problem $2$

Published on 26 Apr 2026 - 10:57

1.3k

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Is there an efficient way to solve De Mere's puzzle?

Published on 12 Apr 2026 - 5:38

1.5k

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Baire's Theorem with locally compact Hausdorff space

Published on 10 Apr 2026 - 19:15

56

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Why is $f_1^2=f_1f_2=1$?

Published on 16 Apr 2026 - 20:19

102

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Hölder's inequality for $\frac{1}{\sqrt{a}} + \frac{1}{\sqrt{b}} + \frac{1}{\sqrt{c}}$

Published on 25 Mar 2026 - 19:06

52

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Importance of the mathematical differentiating of an ellipse (or of a conic)?

Published on 15 Apr 2026 - 13:32

List Question

Question about Rudin (Principles of Math Analysis) theorem 7.26. Why does $Q_n \to 0$ uniformly?

Show that $X= \ker((u-\lambda)^p) \oplus (u-\lambda)^p(X)$ if $u$ is compact.

Understanding Lang's proof that every closed and bounded set is compact

Proof that a closed set contains all the limit points

Why are the sets $G_{\alpha}$ open relative to $X$ in the given proof?

Number theory question from 2017 MO

How to prove that supremum of strictly convex function is infinity?

Baby Rudin Ch. 5 Exercise 2: How does differentiability imply continuity at endpoints?

A question concerning a proof of a theorem. Harmonic Analysis

IMO $2001$ problem $2$

Is there an efficient way to solve De Mere's puzzle?

Baire's Theorem with locally compact Hausdorff space

Why is $f_1^2=f_1f_2=1$?

Hölder's inequality for $\frac{1}{\sqrt{a}} + \frac{1}{\sqrt{b}} + \frac{1}{\sqrt{c}}$

Importance of the mathematical differentiating of an ellipse (or of a conic)?

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