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"