Determinant of matrix with $A_{ij} = \min (i, j)$

How many natural solutions to $x_1+x_2+x_3+x_4=100$ with $x_1 \neq x_2 \neq x_3 \neq x_4$?

Multiplication by One

The First Homology Group is the Abelianization of the Fundamental Group.

Integral using residue theorem complex analysis

Knight and Knaves logic problem

Weighted sum of two dice such that the result is a random integer between $0$ and $35$

Intuition behind the Thom Isomorphism.

An interesting exercise about converging positive series, involving $\sum_{n\geq 1}a_n^{\frac{n-1}{n}}$

2 conjectured recursion limits for $e$ and $\pi$.

Given finitely many points in a vector space $V$, is there a basis such that the first coordinate of each point is distinct?

What is the maximum convergent $x$ in the power tower $x^{x^{x^{x\cdots}}}$?

Radical of an ideal equals the intersection of all prime ideals containing it.

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