\newcommand in LaTeX blocks inside Markdown inputs

\newcommand in LaTeX blocks inside Markdown inputs

[Alex Polozov]

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While converting into non-LaTeX formats such as DOCX, pandoc can parse 
\newcommand macros in the input and apply them automatically to all 
following LaTeX markup in the document. However, such \newcommand macros 
have to be a part of regular input Markdown text:

\newcommand{\state}{\sigma}

Given an input state $\state$...


MathJax, on the other hand, requires \newcommand macros to be included in 
LaTeX blocks, not in plain text. If I'm writing my Markdown in an editor 
with live HTML preview based on MathJax (in my case, StackEdit 
<https://stackedit.io>), I have to write the following:

$$ \newcommand{\state}{\sigma} $$


Given an input state $\state$...


Unfortunately, I cannot pass the latter Markdown into Pandoc: it does not 
apply \newcommands in the resulting DOCX. Thus, I end up duplicating my 
preamble twice: with and without LaTeX embedding.

*Question: *can Pandoc parse \newcommand macros when they are embedded in 
LaTeX within Markdown? Is it an unsupported scenario or just a bug?

Thank you!
Alex.

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