mathjax
Here's another way to show LaTex
within web pages, including these wiki pages,
using a javascript engine that runs within
your browser, dowloaded from mathjax.org
when the page loads - no config needed
on the server.
If it doesn't display at first, reload the page and wait a few seconds.
Here's an equation on its own line :
\[
\left( \sum_{k=1}^n a_k b_k \right)^2
\leq \left( \sum_{k=1}^n a_k^2 \right) \left( \sum_{k=1}^n b_k^2 \right)
\]
And here's one within the text :
\(\int_0^\infty e^{-x} \mathrm{d}x \)