%
% Operations that usually appear in convex optimization.
%
+\ifx\havemjoconvex\undefined
+\def\havemjoconvex{1}
-% Needed for \operatorname.
-\usepackage{amsopn}
+
+\ifx\operatorname\undefined
+ \usepackage{amsopn}
+\fi
\input{mjo-common}
% The ``Extreme vectors'' (or ``Extreme directions'') operator.
\newcommand*{\Ext}[1]{ \operatorname{Ext} \of{{#1}} }
+
+% The "is a face of" and "is a proper face of" relations.
+\newcommand*{\faceof}{ \trianglelefteq }
+\newcommand*{\properfaceof}{ \triangleleft }
+
+
+\fi