TEX filter in Moodle merging overlines -

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i using tex filter write digital logic expressions in moodle , running in significant issue.

if write $$ \overline{a}\overline{b}\overline{c} $$, filter displays overlines single overline instead of 3 separate overlines. inserting individual spaces not seem work either.

it doesn't seem typeface issue; changed bold math typeface , same issue appears.

is there way insert hard space between characters in tex math? or way split overlines?

thanks!

@mlau fractions in tex simple, long remember rules. $$ \frac{numerator}{denominator} $$ produces enter image description here


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