%
% Things that fit absolutely nowhere else.
%
+\ifx\havemjomisc\undefined
+\def\havemjomisc{1}
+
\usepackage{amsmath}
% absolute value, and the meaning of card(X) is clear at once, so we
% prefer the latter.
\newcommand*{\card}[1]{ \operatorname{card} \of{{#1}} }
+
+
+\fi