this post was submitted on 12 Nov 2023
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How to apply different font for math fragments in org mode? (alien.top)
submitted 11 months ago by No-Storage111@alien.top to c/emacs@communick.news
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How do I use the fixed-pitch font for math fragments in org-mode buffers? I.e., I want to use a monospace font for all strings of the form \(...\) or \[...\], where ... may include newline characters as well, as is common for equations written in math display mode.

I'm an Emacs newb, so the best I could come up with was a regex-based font-lock:

(progn
  (setq-local font-lock-keywords
              `((,(rx (group
                       (or "\\[" "\\(")
                       (zero-or-more anything)
                       (or "\\]" "\\)"))) (1 'fixed-pitch))))
  (font-lock-fontify-buffer))

And then running this on an org-mode-hook.

But this is definitely wrong. Not only does it remove all the nice org-mode styling applied to things like section headers, but it's also applying the fixed-pitch font to more than just the intended math fragments, suggesting issues with the regex at least.

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[–] nonreligious@alien.top 1 points 11 months ago

If you have the name of the font you want to use in the LaTeX fragments, have you tried using a LaTeX header at the top of the file, e.g.

#+LaTeX_HEADER:\usepackage{mlmodern}

(Replace mlmodern with whatever typeface you prefer)

If you don't want your .org file to become too cluttered at the start, you could alternatively use a setup file via #+SETUPFILE: /path/to/setup-file.org -- create an org file e.g. setup-file.org, and include a line like

#+LaTeX_HEADER:\usepackage{mlmodern}

or whatever your fixed-pitch/monospace font is supposed to be, as well as all the other options you want to use for LaTeX (like other \usepackage declarations, \newcommand definitions etc.).