parse: stretchy arrow accents \overrightarrow \overleftarrow \overleftrightarrow - #6
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Vector notation (\overrightarrow{AB}) was an unknown command, so the whole
equation was dropped (arXiv census: 21 groups). \overline/\underline already
stack a rule over the nucleus; overArrow does the same with a full-width shaft
plus a triangular head (reusing xArrow's head geometry) at each requested end —
right for \overrightarrow and esvect's \vv, left for \overleftarrow, both for
\overleftrightarrow. The shaft spans the whole width and the heads overlay its
ends, so no width-dependent guard is needed.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Vector notation
\overrightarrow{AB}was an unknown command, so the whole equation was dropped (arXiv census: 21 groups).\overline/\underlinealready stack a rule over the nucleus;overArrowdoes the same with a full-width shaft plus a triangular head (reusingxArrow's head geometry) at each requested end — right for\overrightarrowand esvect's\vv, left for\overleftarrow, both for\overleftrightarrow. The shaft spans the whole width and the heads overlay its ends, so no width-dependent guard is needed.TestOverArrowcovers all variants + the error path; 100% coverage gate green.