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WP-Math-2 can help you insert math formula into WordPress posts or comments. You can use <code>$$...$$</code>(block, only one math expression per line) and <code>$...$</code>(inline, around the text) to insert math. This plugin will render them to HTML or MathML code snippets(Depends on your browser. If your browser supports MathML, it will use MathML, otherwise, use HTML and CSS instead). This work is done by javascript. So your browser must enable JavaScript.
But in most of RSS readers, any JavaScript snippets cannot execute. So I made a trick. WP-Math-2 will convert LaTeX text to images. So users can see math contents with their favorite RSS reader software.

WP-Math-2

WP-Math-2 is a plugin that can convert LaTeX math formula to HTML of images, so that the formula could be shown in browser.

knowledgeblog

sjcockell

philliplord

d_swan

Paul Schreiber

Jared Wenerd

MathJax enables enables rendering of embedded LaTeX or MathML in HTML pages. This plugin adds this functionality to WordPress. The MathJax JavaScript is inject on-demand only to those pages which require it. This ensures that MathJax is not loaded for all pages, which will otherwise slow loading down.
The MathJax JavaScript can be delivered from your own server, or you can use the Cloudflare Content Distribution Network (CDN), which is the preferred mechanism as it offers increased speed and stability over hosting the JavaScript and configuring the library yourself.
You may embed latex using a variety of different syntaxes. The shortcode (https://codex.wordpress.org/Shortcode_API) syntax is preferred. So <code>[latex]E=mc^2[/latex]</code> will work out of the box. This also forces loading of MathJax.
Additionally, you can use native MathJax syntax — <code>$$E=mc^2$$</code> or <code>$E=mc^2$</code>. However, if this is the only syntax used, the plugin must be explicitly told to load MathJax for the current page. This can be achieved by adding a <code>[mathjax]</code> shortcode anywhere in the post. For posts with both <code>[latex]</code>x<code>[/latex]</code> and <code>$$x$$</code> syntaxes this is unnecessary.
You can use wp-latex syntax, <code>$latex E=mc^2$</code>. Parameters can be specified as with wp-latex but will be ignored. This means that MathJax-LaTeX should be a drop-in replacement for wp-latex. Because this conflicts with wp-latex, this behaviour is blocked when wp-latex is present, and must be explicitly enabled in the settings.
You can also specify <code>[nomathjax]</code> — this will block mathjax on the current page, regardless of other tags.
MathJax-LaTeX is developed on <a href="https://github.com/phillord/mathjax-latex" rel="nofollow ugc">GitHub</a>.
<h3>Copyright</h3>
This plugin is copyright Phillip Lord, Newcastle University and is licensed under GPLv2.

MathJax-LaTeX

This plugin enables MathJax (http://www.mathjax.org) functionality for WordPress (http://www.wordpress.org).

WP-Math-2 vs MathJax-LaTeX