List questions from problem-solving

Published on 05 Dec 2023 - 23:00

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Buffon's needle in one dimension

Published on 24 Mar 2026 - 3:15

62

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$X = [1_n \hspace{1mm} Z]$ with full column rank, then $(I_n - \frac{1}{n}J_n)Z$ is full-column rank

Published on 31 Mar 2026 - 15:46

343

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Recommendations for a Comprehensive Problem Book(s) in Calculus $3$.

Published on 03 Apr 2026 - 9:09

44

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Number of committees?

Published on 11 Dec 2023 - 18:21

118

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How many numbers between 10 and 100 are divisible by 3 but not 2 nor 7?

Published on 30 Mar 2026 - 14:20

161

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Combinatorics question: teams vs missions

Published on 15 Dec 2023 - 13:35

37

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Question on Rudin's functional analysis Chapter 1, Exercise 21

Published on 15 Dec 2023 - 19:44

84

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Direct integration and integration by parts doesn't yield the same result

Published on 18 Dec 2023 - 2:40

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How to solve this equation $8 \left(3^x+5^x+7^x\right)=5\cdot 2^x+2\cdot 4^x+17\cdot 6^x$?

Published on 18 Dec 2023 - 10:24

65

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Some maths journals for tough Olympiad and real analysis problems?

Published on 20 Dec 2023 - 3:09

29

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Normality of the derived family of a normal family.

Published on 23 Feb 2026 - 4:24

255

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Inequality involving $f(x)=e^x-x^2/2$ with $f'(a)=f'(b)$ ($a\ne b$)

Published on 29 Dec 2023 - 12:57

70

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A proof of the fact that Heisenberg group is a closed subgroup of $GL(3,\mathbb R).

Published on 31 Dec 2023 - 13:53

92

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$\frac{a}{\sqrt{2a^2+3bc}}+\frac{b}{\sqrt{2b^2+3ca}}+\frac{c}{\sqrt{2c^2+3ab}} \le \sqrt{ab+bc+ca}$

Published on 26 Mar 2026 - 11:00

List Question

Number of dinners

Buffon's needle in one dimension

$X = [1_n \hspace{1mm} Z]$ with full column rank, then $(I_n - \frac{1}{n}J_n)Z$ is full-column rank

Recommendations for a Comprehensive Problem Book(s) in Calculus $3$.

Number of committees?

How many numbers between 10 and 100 are divisible by 3 but not 2 nor 7?

Combinatorics question: teams vs missions

Question on Rudin's functional analysis Chapter 1, Exercise 21

Direct integration and integration by parts doesn't yield the same result

How to solve this equation $8 \left(3^x+5^x+7^x\right)=5\cdot 2^x+2\cdot 4^x+17\cdot 6^x$?

Some maths journals for tough Olympiad and real analysis problems?

Normality of the derived family of a normal family.

Inequality involving $f(x)=e^x-x^2/2$ with $f'(a)=f'(b)$ ($a\ne b$)

A proof of the fact that Heisenberg group is a closed subgroup of $GL(3,\mathbb R).

$\frac{a}{\sqrt{2a^2+3bc}}+\frac{b}{\sqrt{2b^2+3ca}}+\frac{c}{\sqrt{2c^2+3ab}} \le \sqrt{ab+bc+ca}$

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