Latex
Block math works with two dollar signs $$...$$
f\hat(\xi),e^{2 \pi i \xi x}
\,d\xi$$
Inline math also works with single dollar signs `$...$`. For example, Euler's identity but inline: $e^{i\pi} = -1$
Aligned equations work quite well:
\begin{aligned} a &= b + c \ &= e + f \ \end{aligned}
\begin{bmatrix} 1 & 2 & 3 \ a & b & c \end{bmatrix}