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Enables tex math inside $
or $$
.
Anything between two $
characters will be treated as TeX math. The
opening $
must have a non-space character immediately to its right,
while the closing $
must have a non-space character immediately to its
left, and must not be followed immediately by a digit. Thus,
$20,000 and $30,000
won’t parse as math. If for some reason you need to
enclose text in literal $
characters, backslash-escape them and they
won’t be treated as math delimiters.