After 40+ days of military intervention, studies will start on Dec. 21th in universities, and in my college on Jan, 21th. I look forward meeting my students and talk to three-dimensional people on site. During this challenging period, feel free to contact me by mail anytime.

\[\int_{-\infty}^\infty e^{-x^2/2}\, dx = \sqrt{2\pi}.\]

If you identified this line, good for you! If not, we’ll meet in probability class. If you only see gibberish, it means that there is no LaTeX automatic conversion. Don’t pay attention to it.