Test Latex Math Post

This post is to test math

$x = y^z$

but can it do $i=n^{line}$ math? $\int_{foo}^{bar} \delta d\delta = \infty \Pi_i \Sigma 3$

another eqn

$f(x) = \int_{-\infty}^{\infty} \hat{f} (\Upsilon) e^{2\pi i x \xi}$

add some more text