Is there an encyclopedia of mathematical notation?

Prove that $\sum_{r=1}^n \frac 1{r}\binom{n}{r} = \sum_{r=1}^n \frac 1{r}(2^r - 1)$

How does $\tan^{-1}(x-\sqrt{1+x^2})=\frac{1}{2}\tan^{-1}x+C$ directly?

Is null vector always linearly dependent?

Sum of logs in the form of $1\log1 +2\log2 +\ldots +n\log n$

Maximising determinant problem

Why are units called units?

Why do we need compactness?

How to determine whether this function is differentiable at a point?

Trouble understanding why Disjunctive Normal Form is polynomial time solvable but not CNF.

Probability of winning in a die rolling game with six players

Generating functions for tail length and rho-length

infinite subset of an finite set?

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