Math

And here is some display math:

\[\int_0^\infty \theta e^{-\theta x}\, dx = 1\]

Here is some inline math. $f(x) = \theta \exp\p{-\theta x}$.

\[\begin{aligned} X_i &\ind \text{Exponential}(\theta) \\ \bar{X} &\overset{\cdot}{\sim} \text{Normal}(\theta^{-1}, \theta^{-2}/n) \\ \end{aligned}\]

Also, note that I am using the Fira Sans font, and not the default KaTeX (serif) math font.