Preventing pandoc from adding a space after comma used as a decimal separator in math mode

Question

I am using pandoc to convert markdown files containing TeX bits to html.

Because the text is in Italian, I want to use comma as a decimal separator. However, pandoc keeps adding a space after the comma. Here is a simple example:

echo '0,5 $0,5$' | pandoc

it gives:

<p>0,5 <span class="math inline">0, 5</span></p>

Notice the space is not added when the number is not in math mode.

What I want is something similar to what is achieved by LaTeX package icomma, or some other workaround to prevent the insertion of the space. Any advice?

Heiko Theißen · Accepted Answer · 2025-03-20 16:38:28Z

0

TeX math mode does not treat a comma like an ordinary character, but you can circumvent that by putting the comma in {}. However, that only works if you use MathJax for rendering:

echo 0,5 vs. $0,5$ vs. $0{,}5$ | pandoc --mathjax -s

outputs an HTML document equivalent to the following snippet:

<script src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-chtml-full.js" type="text/javascript"></script>
<p>0,5 vs. <span class="math inline">\(0,5\)</span> vs. <span
class="math inline">\(0{,}5\)</span></p>

edited Mar 20 at 16:38

answered Mar 20 at 16:32

Heiko Theißen

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