<..equations of amstex.tex..>+
\let\:tempc=\bmatrix
\pend:def\:tempc{\a:bmatrix}
\HLet\bmatrix=\:tempc
\let\:tempc=\endbmatrix
\append:def\:tempc{\b:bmatrix}
\HLet\endbmatrix=\:tempc
\NewConfigure{bmatrix}{2}
-_-_-
<..equations of amstex.tex..>+
\pend:def\vmatrix{\a:vmatrix}
\append:def\endvmatrix{\b:vmatrix}
\NewConfigure{vmatrix}{2}
-_-_-
<..equations of amstex.tex..>+
\pend:def\Vmatrix{\a:Vmatrix}
\append:def\endVmatrix{\b:Vmatrix}
\NewConfigure{Vmatrix}{2}
-_-_-