Up to now I've been using the Simple Mathjax plugin, which also works well, but is not able to inject the mathjax dependency selectively.
On my sites I have math only on a very few pages, and MathJax-LaTeX enables me to enable mathjax only on those pages by just adding the [mathjax] shortcode somewhere.
Importantly, remember to disable Jetpack Beautiful Math, else it can interfere with MathJax-LaTeX. (at the time of writing, Jetpack is still turning math into bitmaps, which is not nearly as beautiful as MathJax on capable browsers).
See https://vxlabs.com/2014/06/16/level-sets-the-practical-10-minute-introduction/ for an example.
Using the MathJax-LaTeX plugin makes math real simple and beautiful on my site. There may be some tiny "bugs" from time to time, but nothing I could not fix by looking at the docs.mathjax.org.
Using math on your blog never was simpler!
While it had no problem installing it, the transitions from Wp-Latex to Mathjax-Latex wasn't as smooth as I hoped for. The plugin seems to have two bugs which make a lot of the formulas on our blog not render. It is a show stopper for us, therefore only 2 stars.
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