Unexpected parsing _underline_ in $LaTeX$

[foreshadow]

I tried it in demo.
There is a LaTeX formula in my markdown

$\Pi_{\text{Sno},\text{Cno}}(\text{SC})\div \Pi_{\text{Cno}}(\text{Course})\bowtie \Pi_{\text{Sno},\text{Sname}}(\text{Student})$

And it is parsed to

$\Pi<em>{\text{Sno},\text{Cno}}(\text{SC})\div \Pi</em>{\text{Cno}}(\text{Course})\bowtie \Pi_{\text{Sno},\text{Sname}}(\text{Student})$

in which the underlines _ was parsed to <em></em> and I do not expect that.
What should I do to avoid this? Is it a bug or unsupported feature?
By the way, I am using mathjax to render this.

[aidantwoods]

Funnily enough I'd been having my own go at integrating MathJax LaTeX into Parsedown. So here's a hack to do it for now (Parsedown may want to forgo parsing the actual mathjax latex syntax by default though).

I opted to overload the ` inline marker for inline MathJax LaTeX (actual inline code can now be two (``) or more backticks), and have defined a specific language parser for fenced code to show up as block latex.

(Obviously, those are both my decisions based entirely on my own preferences – so don't take those as an implied standard or anything)

Branch here: https://github.com/aidantwoods/parsedown/tree/mathjaxlatex

Because the text containing the LaTeX now has its own handler, we can avoid Parsedown trying to apply markdown to it.

E.g.

include('Parsedown.php');
include('ParsedownExtensionMathJaxLaTeX.php');

$Parsedown = new ParsedownExtensionMathJaxLaTeX();

test source:

test text inline LaTeX: `x = \int_{0^1}^1(-b \pm \sqrt{b^2-4ac})/(2a)` more
inline text

```
x = \int_{0^1}^1(-b \pm \sqrt{b^2-4ac})/(2a)
```

```latex
x = \int_{0^1}^1(-b \pm \sqrt{b^2-4ac})/(2a)
```

`\Pi_{\text{Sno},\text{Cno}}(\text{SC})\div \Pi_{\text{Cno}}(\text{Course})
\bowtie \Pi_{\text{Sno},\text{Sname}}(\text{Student})`

```latex
\Pi_{\text{Sno},\text{Cno}}(\text{SC})\div \Pi_{\text{Cno}}(\text{Course})
\bowtie \Pi_{\text{Sno},\text{Sname}}(\text{Student})
```

```not-latex
\Pi_{\text{Sno},\text{Cno}}(\text{SC})\div \Pi_{\text{Cno}}(\text{Course})
\bowtie \Pi_{\text{Sno},\text{Sname}}(\text{Student})
```

* line item

``inlineCode``

output:

<p>test text inline LaTeX: <span>\(x = \int_{0^1}^1(-b \pm \sqrt{b^2-4ac})/(2a)\)</span> more
inline text</p>
<pre><code>x = \int_{0^1}^1(-b \pm \sqrt{b^2-4ac})/(2a)</code></pre>
<span>$$
x = \int_{0^1}^1(-b \pm \sqrt{b^2-4ac})/(2a)
$$</span>
<p><span>\(\Pi_{\text{Sno},\text{Cno}}(\text{SC})\div \Pi_{\text{Cno}}(\text{Course}) \bowtie \Pi_{\text{Sno},\text{Sname}}(\text{Student})\)</span></p>
<span>$$
\Pi_{\text{Sno},\text{Cno}}(\text{SC})\div \Pi_{\text{Cno}}(\text{Course})
\bowtie \Pi_{\text{Sno},\text{Sname}}(\text{Student})
$$</span>
<pre><code class="language-not-latex">\Pi_{\text{Sno},\text{Cno}}(\text{SC})\div \Pi_{\text{Cno}}(\text{Course})
\bowtie \Pi_{\text{Sno},\text{Sname}}(\text{Student})</code></pre>
<ul>
<li>line item</li>
</ul>
<p><code>inlineCode</code></p>