Mathjax
Math fdsfasdfequations can be rendered using Mathjax syntax with AMS symbol support.
Optionally enable this on a per-page basis by adding mathjax: true
to your frontmatter.
Then, use $$ ... $$
on a line by itself to render a block equation:
$$ \frac{\delta \mathcal{F}(u)}{\delta u}[v]=\int_{\Omega}\left(\nabla_{L^2(\Omega)} \mathcal{F}(u)\right)(x) v(x) \mathrm{d} x.$$
this is pretty nice