tigerlihao

This plugin can let you add mathematical equations to your posts using latex. 
Google chart API is used in this plugin to turn the latex strings to equation images. 
The equation images will be stored on your site, so it will be efficient.
To add equations in your articles, just surround the latex script with <code>[eq]</code> and <code>[/eq]</code> tags. 
For example, add following codes <code>[eq]\alpha+\beta\geq\gamma[/eq]</code> in your posts.

Google Equation for WordPress

Using Google chart API for LaTeX to add mathematical equations as images.

kirkpatrick

cityjin

advanpix

Insert formulas & graphics in the posts and comments using native LaTeX shorthands directly in the text. Inline formulas, displayed equations auto-numbering, labeling and referencing, AMS-LaTeX, <code>TikZ</code>, custom LaTeX preamble. No LaTeX installation required. Easily customizable using UI page. Actively developed and maintained. Visit <a href="http://www.holoborodko.com/pavel/quicklatex/" rel="nofollow ugc">QuickLaTeX homepage</a> for more info.
<ul>
<li>Standard LaTeX expressions can be cut and pasted directly into WordPress posts, pages, and comments; display environments require no enclosures, other expressions require only a surrounding <code>$..$</code> or <code>\[..\]</code>. No need for enclosing tags <code>[latex] ... [/latex]</code>.</li>
<li>Correct vertical positioning of inline formulas relative to baseline of surrounding text. Say “NO” to jumpy equations produced by other plugins!</li>
<li>SVG vector graphics support, so that formulas are crisp regardless of scaling in browser.</li>
<li>(AMS)LaTeX displayed math environments support: <code>equation, align, gather, multiline, flalign, alignat,</code> etc.</li>
<li>Automatic numbering of displayed equations. Override autonumbering with <code>\tag{}</code> LaTeX command.</li>
<li>Equation hyper-referencing by standard LaTeX rules with <code>\label{}</code>, <code>\ref{}</code>.</li>
<li>Custom LaTeX document preamble, allowing added <code>\usepackage{}</code> and <code>\newcommand{}</code>.</li>
<li><code>TikZ</code> and <code>pgfplots</code> graphics package support.</li>
<li>Preview formulas in comments before publishing. Additionally <a href="http://blogwaffe.com/ajax-comment-preview/" rel="nofollow ugc">AJAX Comment Preview</a> plugin should be installed to enable this feature.</li>
<li>Meaningful error messages for mistakes in LaTeX code.</li>
<li>Precise font properties tuning: <code>size, text and background color</code>. </li>
<li>Easy style customization using UI or CSS file.</li>
<li>No LaTeX installation is required. </li>
<li>QuickLaTeX.com automatically provides formula images, which are then cached on user’s server.</li>
<li>Administrative settings page for setting global parameters; AJAX-ified.</li>
</ul>
Just place LaTeX math expressions into your text and enable QuickLaTeX on the page by <code>[latexpage]</code> command. 
WP QuickLaTeX will convert them to high-quality images and embed into post. Inline formulas will be properly aligned with the text. 
Displayed equations will be auto-numbered by LaTeX rules. 
To see plugin in action please visit math-pages on my blog, e.g. <a href="http://www.holoborodko.com/pavel/numerical-methods/numerical-derivative/central-differences/" rel="nofollow ugc">Central Differences</a>, 
<a href="http://www.holoborodko.com/pavel/numerical-methods/numerical-integration/cubature-formulas-for-the-unit-disk/" rel="nofollow ugc">Cubature formulas for the unit disk</a>, <a href="http://www.holoborodko.com/pavel/numerical-methods/numerical-derivative/smooth-low-noise-differentiators/" rel="nofollow ugc">Smooth noise robust differentiators</a>, etc.

WP QuickLaTeX

Advanced LaTeX plugin. Native LaTeX syntax. Allows custom preamble, TikZ and other packages. Zoom-independent visual quality (SVG).

Google Equation for WordPress vs WP QuickLaTeX