use mathjax render formula in a class without delimiters

["redsto...-9Onoh4P/yGk@public.gmane.org" <redstone-cold-9Onoh4P/yGk@public.gmane.org>]

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I use markdown_it 
<https://markdown-it-py.readthedocs.io/en/latest/using.html> to convert my 
Markdown to html, the converted formula lost its delimiters, which caused 
my mathjax cannot render the formula, my mathjax confirmation is :

<script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script> 
<script id="MathJax-script" async 
src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script> 
<script type="text/javascript"> var MathJax = { tex: { inlineMath: [ 
["\\(","\\)"] ], displayMath: [ ["\\[","\\]"] ], processEscapes: true, 
processEnvironments: true }, options: { ignoreHtmlClass: ".*|", 
processHtmlClass: "math" } }; </script> 

The HTML:
<p>a rational number like <span class="math inline">\begin{matrix} L &amp; 
\ = \{ x \mid x \in \mathbb{Q},x \leq 0\} \cup \left\{ x \mid x \in 
\mathbb{Q},x &gt; 0,x^{2} &lt; 2 \right\} \\ U &amp; \ = \mathbb{Q} - L = 
\left\{ x \mid x \in \mathbb{Q},x &gt; 0,x^{2} &gt; 2 \right\} \\ 
\end{matrix}</span> .<br /> 2. A fact between two Dedekind cuts(the density 
of <span class="math inline">Q</span> in <span class="math 
inline">R</span>): For any pair of real numbers <span class="math 
inline">\alpha</span> and <span class="math inline">\beta</span>, where 
<span class="math inline">\alpha &gt; \beta</span>, there can always be 
found a real, and even in particular a rational, number <span class="math 
inline">r</span> which lies between them, i.e. <span class="math 
inline">\alpha &gt; r &gt; \beta</span> (and, consequently, an infinite set 
of such rational numbers).</p> 

The demo:https://jsbin.com/qecewiz/edit?html,output

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