LaTeX

Block math works with two dollar signs $$...$$

$$f(x) = \int_{-\infty}^\infty f\hat(\xi),e^{2 \pi i \xi x} ,d\xi$$

Inline math also works with single dollar signs $...$. For example, Euler’s identity but inline: $e^{i\pi} = -1$

Aligned equations work quite well:

$$\begin{aligned} a &= b + c \\ &= e + f \\ \end{aligned}$$

And matrices

$$\begin{bmatrix} 1 & 2 & 3 \\ a & b & c \end{bmatrix}$$