<..accents of amsmath.sty..>
\HLet\Hat=\hat
\HLet\Check=\check
\HLet\Tilde=\tilde
\HLet\Acute=\acute
\HLet\Grave=\grave
\HLet\Dot=\dot
\HLet\Ddot=\ddot
\HLet\Breve=\breve
\HLet\Bar=\bar
\HLet\Vec=\vec
-_-_-