Supernotes uses LaTeX languages to render maths equations instantly. For inline maths equations you can surround the LaTeX with a single dollar symbol,  $  . For example:

Or if you want to give your equation real emphasis, try creating an equation block, by surrounding the equation with two dollar symbols,  $$  , on a new line. 

Supernotes helps you to write LaTeX by monospacing the font and syntax highlighting LaTeX when used as a block.

Don't know all the symbols? Search for them in this awesome latex guide.