I am teaching mathematics in the so called "classes préparatoires aux grandes écoles".

Other centers of interest are music (used to play classical guitar for years) with a special devotion for Bach's music and hiking in nature.

If you can read french, please visit my blog at https://math-os.com

You may also have a look at my YouTube channel "Math-OS in english" : https://bit.ly/3Ad4yKE

Here is one of my favorite formulas :

$$\gamma=\frac{\ln(2)}{2}+\frac{1}{\ln(2)}\sum_{n=2}^\infty\frac{(-1)^n\ln(n)}{n}$$

where $\gamma$ is Euler constant. More generally, I am interested in formulas that connect mathematical constants in an unexpected way.