A complex formula with two ‘_’ cannot be successfully converted into HTML source code

[Thomas333333]

A complex formula with two ‘_’ cannot be successfully converted into HTML source code.

Issue Summary

when I use jekyll to build my blog, I would like to incorporate the functionality to render LaTeX formulas into HTML source code. After adding the corresponding script, it still fails to render this formula：$\hat{y}=\mathrm{argmax}_{y}P_{\theta}({y}|x)$

Steps to Reproduce:

1. Use default jekyll to gender markdown to html source
2. add mathjax script
3. render this formula $\hat{y}=\mathrm{argmax}_{y}P_{\theta}({y}|x)$

I guess it is because jekyll will process the part caught by _ first . When it turns to mathjax to play its role, it can't recognize it. I wonder is it a bug for mathjax, because I can't render any formula with two more _

Technical details:

• MathJax Version: 3.2
• Client OS: windows11
• Browser: none

I am using the following MathJax configuration:

and loading MathJax via

<script>
MathJax = {
  tex: {
    inlineMath: [['$', '$']]
  }
};
</script>
<script id="MathJax-script" async
  src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-chtml.js">
</script>

[dpvc]

You are correct that it is due to Jekyll processing the _ as indicating italics (notice that {y}P are in italics in your image). That means Jekyll has inserted HTML tags into the math to switch to italics, and MathJax doesn't process math that contains HTML tags. This is not a bug in MathJax, it is because Jekyll does not know the difference between mathematics and text, and processes them both the same.

This has been discussed several times before (see #3007, #2757, #830, #329). All of these discuss potential work-arounds.

[Thomas333333]

Thank you for your answer, I admire your memory from the bottom of my heart!