X-Git-Url: http://gitweb.michael.orlitzky.com/?p=mjotex.git;a=blobdiff_plain;f=mjo-topology.tex;h=040a432b5b6c48926b9c2af15eefbe949edc23a0;hp=5f104510b7381c42782728452a77c1097d4bdddc;hb=HEAD;hpb=1997f5caa0a548beade98765fa9b679a8de26bdf

diff --git a/mjo-topology.tex b/mjo-topology.tex
index 5f10451..040a432 100644
--- a/mjo-topology.tex
+++ b/mjo-topology.tex
@@ -1,17 +1,24 @@
 %
 % Standard topological operations.
 %
+\ifx\havemjotopology\undefined
+\def\havemjotopology{1}
 
-% Needed for \operatorname.
-\usepackage{amsopn}
 
-\input{mjo-common}
+\ifx\operatorname\undefined
+  \usepackage{amsopn}
+\fi
+
+\input{mjo-common} % for \of, at least
 
 % The ``interior of'' operator.
 \newcommand*{\interior}[1]{ \operatorname{int}\of{{#1}} }
 
 % The ``closure of'' operator.
-\newcommand*{\closure}[1]{ \overline{{#1}} }
+\newcommand*{\closure}[1]{ \operatorname{cl}\of{{#1}} }
 
 % And the ``boundary of'' operator.
 \newcommand*{\boundary}[1]{ \operatorname{bdy}\of{{#1}} }
+
+
+\fi