How many rows and columns are in an m x n matrix?

Prove that $i^i$ is a real number

Why can't a neighborhood be a finite set?

Is this number irrational?

Is $\langle a,b \mid a^2b^2=1 \rangle$ a semidirect product of $\mathbb{Z}^2$ and $\mathbb{Z}_2$?

When is a sum of consecutive squares equal to a square?

Perimeter of an ellipse

How can I explain this integer partitions function recursion?

Number of countable subsets of $\mathbb{R}$

References on Linear Algebraic Groups/Lie Theory

how to be good at proving?

Evaluating $ \lim\limits_{n\to\infty} \sum_{k=1}^{n^2} \frac{n}{n^2+k^2} $

What does "$\cdots$" mean in $\frac{n(n-1)(n-2)\cdots(n-r+2)}{(r-1)!}a^{n-r+1}b^{r-1}$?

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