What is the general term for concepts like length, area and volume?

Random solving of a Rubik cube .

What's true in $\mathbb{R}^4$, false in $\mathbb{R}^3$ and uninteresting in $\mathbb{R}^5$?

How to prove $\sum_{i=1}^ki^k(-1)^{k-i}\binom {k+1}{i} =(k+1)^k$

Calculate $\lim_{n\to \infty} \frac{\frac{2}{1}+\frac{3^2}{2}+\frac{4^3}{3^2}+...+\frac{(n+1)^n}{n^{n-1}}}{n^2}$

Prove the identity $\binom{2n+1}{0} + \binom{2n+1}{1} + \cdots + \binom{2n+1}{n} = 4^n$

If $4$ people are chosen out of $6$ married couples, what is the chance that exactly one married couple is among the $4$ people?

divergence of the cross product of two vectors proof

example of a nonempty subset is closed under scalar multiplication but not a subspace

Difference between $\frac{df}{dx}$, $\frac{\Delta f}{\Delta x}$, and $\frac{\partial f}{\partial x}$

if the inverse images of all closed balls are closed, is $f$ continuous?

Last $500$ digits of $2015!-1$

Probability that a quadratic equation with random coefficients has real roots

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