LaTeX

First we do this

x^2 + y^2 = 1
y = \sqrt{1 - x^2}

Then we do this:

\frac{x_2 + x_1}{\Phi \pm \gamma^2}

It’s easy to see from there that

\forall y, y \epsilon \aleph_{0}: y \mapsto \xi

Which, clearly, concludes that.

\sum\limits_{n=1}^{\infty} 2^{-n} = 1

And a different block:

variable_name = "cool"