Stack has built-in support for math typesetting using KaTeX.
It's not enabled by default side-wide, but you can enable it for individual posts by adding math: true to the front matter. Or you can enable it side-wide by adding math = true to the params.article section in config.toml.
Inline math #
This is an inline mathematical expression: $\varphi = \dfrac{1+\sqrt5}{2}= 1.6180339887…$
$\varphi = \dfrac{1+\sqrt5}{2}= 1.6180339887…$
Block math #
$$ \varphi = 1+\frac{1} {1+\frac{1} {1+\frac{1} {1+\cdots} } } $$
$$
\varphi = 1+\frac{1} {1+\frac{1} {1+\frac{1} {1+\cdots} } }
$$
$$ f(x) = \int_{-\infty}^\infty\hat f(\xi),e^{2 \pi i \xi x},d\xi $$
$$
f(x) = \int_{-\infty}^\infty\hat f(\xi)\,e^{2 \pi i \xi x}\,d\xi
$$