List questions from recreational-mathematics

Published on 01 Apr 2026 - 17:27

53

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The notion of the gradient in a multivariate function

Published on 28 Mar 2026 - 2:03

355

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What is some creative mathematical work that an undergraduate can do?

Published on 19 May 2020 - 13:25

185

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In a group of people rolling dice, what is the probability that you tie for highest roll multiple times in a row?

Published on 28 Mar 2026 - 19:30

92

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Why can iteratively searching from (N mod K)*10+1 in this problem find the length of the smallest repunit?

Published on 03 Apr 2026 - 6:09

82

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probability of finishing at r^th game by m people

Published on 30 Mar 2026 - 9:55

119

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Prove, with restriction, that $\pi\neq\sqrt{2}+\sqrt{3}$

Published on 21 May 2020 - 18:17

87

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Combinatorics on "even outcomes"

Published on 02 Apr 2026 - 1:42

273

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If $A,B$ and $AB$ are symmetric matrices then is $A^{-1}B^{-1}$ also symmetric.

Published on 29 Mar 2026 - 4:10

342

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Smallest Number $k \in \mathbb{N}$ Such That $(2k-9)! \equiv 0\pmod{k!^2}$

Published on 30 Mar 2026 - 9:35

1.4k

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How to calculate "as the crow flies" maths?

Published on 25 May 2020 - 15:07

46

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commenting on whether $f'(x)$ is even or odd.

Published on 23 Feb 2026 - 11:48

5.9k

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What is the size of each side of the square?

Published on 01 Apr 2026 - 2:36

65

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Examples of combinatorial optimization problems that after some theoretical result was solved analytically

Published on 27 Mar 2026 - 8:40

353

Views

How to choose a special modulus to show that $6n^3 +3 = m^6$ has no solutions in the integers

Published on 02 Apr 2026 - 7:04

List Question

Determinant of the square matrix $A$ where $a_{i,j}=|j-i|$

The notion of the gradient in a multivariate function

What is some creative mathematical work that an undergraduate can do?

In a group of people rolling dice, what is the probability that you tie for highest roll multiple times in a row?

Why can iteratively searching from (N mod K)*10+1 in this problem find the length of the smallest repunit?

probability of finishing at r^th game by m people

Prove, with restriction, that $\pi\neq\sqrt{2}+\sqrt{3}$

Combinatorics on "even outcomes"

If $A,B$ and $AB$ are symmetric matrices then is $A^{-1}B^{-1}$ also symmetric.

Smallest Number $k \in \mathbb{N}$ Such That $(2k-9)! \equiv 0\pmod{k!^2}$

How to calculate "as the crow flies" maths?

commenting on whether $f'(x)$ is even or odd.

What is the size of each side of the square?

Examples of combinatorial optimization problems that after some theoretical result was solved analytically

How to choose a special modulus to show that $6n^3 +3 = m^6$ has no solutions in the integers

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