Math LaTeX issues with underscore

[inikishev]

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Description

I write this:

$\mathbf{x}_{t}$ and $\mathbf{g}_{t}$

Here is what it should look like:

Now I am going to paste this line, and github will fail to render it:

$\mathbf{x}{t}$ and $\mathbf{g}{t}$

I have the same issue with my page, where this also fails to render this. And I am not sure how to fix this.

Operations you have already tried

The following works:

$\mathbf{x}_t$ and $\mathbf{g}_t$

$\mathbf{x}_t$ and $\mathbf{g}_t$

However that makes it impossible to do this:

$\mathbf{x}_{t+1}$ and $\mathbf{g}_{t-1}$

Which doesn't render:

$\mathbf{x}{t+1}$ and $\mathbf{g}{t-1}$

Anything else?

No response

[inikishev]

alright, I have fixed this via the following method:

So my workflow is, I have a "raw posts" directory where I write normal markdown, then I run a script which embeds all latex into {::nomarkdown} and saves to "_posts" directory. Here is the embedding part:

def wrap_math(content: str):
    """
    Wraps $...$ and $$...$$ into {::nomarkdown}
    """
    # for $..$
    p1 = r'\$[^\n\$]+\$'

    # for $$..$$
    p2 = r'\$\$[\s\S]*?\$\$'

    pattern = re.compile(f'({p2})|({p1})')

    def replacer(match):
        return f"{{::nomarkdown}}{match.group(0)}{{:/nomarkdown}}"

    return pattern.sub(replacer, content)

so for example I do this

with open(Path("raw_posts") / name, "r", encoding='utf8') as f:
    md = f.read()

# wrap math
md = wrap_math(md)

with open(Path("_posts") / name, "w", encoding='utf8') as f:
    f.write(md)