$$\begin{vmatrix}a & b\\ c & d \end{vmatrix}=ad-bc$$
$$\begin{vmatrix}a & b\ c & d \end{vmatrix}=ad-bc$$
You can also do inline math like e^{2i\pi} = 1 .
e^{2i\pi} = 1
Obsidian uses Mathjax. You can check which packages are supported in Mathjax here.
