# A Mathematician’s Check

If your employer is a mathematician, you will probably see some strange symbols like those shown on the check below.

To those who are familiar with the notation will not be happy to receive the check since it’s worthless. The symbol $e^{i \pi}$ equals $-1$ and the series $\sum_{n=1}^\infty \frac{1}{2^n}$ is equal to $1$.