Update yssymbols.sty

latex/yssymbols.sty

@@ -26,6 +26,8 @@
 \DeclareMathOperator{\card}{Card}
 \NewDocumentCommand\abs{m}{{\left|#1\right|}}
 
+\let\bar\overline
+
 \AtBeginDocument{
 \let\leq\leqslant
 \let\geq\geqslant