Github the pair of underline _ in math equtions $$ in markdown is explained to italic text not math equtions

Question

In the markdown file, I try to write my in-line math equations in the $$.

But there must be something wrong when I use the _ for subscript in two in-line equations.

The engine of the GitHub markdown file will explain them as an italic font text, not two equations.

But my markdown preview in VS Code shows it well.

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Sample:

the origin text:

math sample $a_i$ and $b_i$ and $\\hat{p}\_{\\sigma(i)}(c_i)$ and $\\mathcal{L}\_{box}(b_i,\\hat{b}\_{\\sigma(i)})$.

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the GitHub result:

you see the underline _ after hat{} and mathcal{} are explained to italic text.

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my VS Code preview result:

Answer 1

I find an answer myself, it is a little trick.

Just add a little space after underline _ to cheat the Github Markdown engine, and it will not think the pair of underline _ as mark of italic text and show the true math equations.

Just try the under text, there is space after \hat{p}_ and $\mathcal{L}_.

math sample $a_i$ and $b_i$ and $\hat{p}_ {\sigma(i)}(c_i)$ and $\mathcal{L}_ {box}(b_i,\hat{b}_{\sigma(i)})$.

Result in Github:

I hope it may help others to make there markdown text more beautiful.