Use
$\bar{a}$ gives me the overbar for one letter.
$\overleftrightarrow{AB}$ gives me the line segment with left and right arrow.
$\overline{AB}$ gives me the line segment symbol.
$\overrightarrow{AB}$ gives me the ray symbol with right arrow.
$\overleftarrow{AB}$ gives me the ray symbol with left arrow.
with the mathtools or amsmath packages.
Bibliography:
- https://stackoverflow.com/
- https://www.overleaf.com/
- https://en.wikibooks.org/wiki/Main_Page
- https://ashki23.github.io/index.html
- https://editor.codecogs.com/
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