X-Git-Url: http://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=mjo-convex.tex;h=dfc282213908c28028b8d018474de6b19a368555;hb=ba0227140d34fe1c8cacdb4996b5896aec4c4013;hp=985731e68db59a8baacbbdd432b920d564daf1a0;hpb=10971bbd4f9e00f481f7d8f442e235b6b538ace9;p=mjotex.git

diff --git a/mjo-convex.tex b/mjo-convex.tex
index 985731e..dfc2822 100644
--- a/mjo-convex.tex
+++ b/mjo-convex.tex
@@ -1,6 +1,9 @@
 %
 % Operations that usually appear in convex optimization.
 %
+\ifx\havemjoconvex\undefined
+\def\havemjoconvex{1}
+
 
 % Needed for \operatorname.
 \usepackage{amsopn}
@@ -24,3 +27,10 @@
 
 % 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