%
% Standard topological operations.
%
+\ifx\havemjotopology\undefined
+\def\havemjotopology{1}
+
% Needed for \operatorname.
\usepackage{amsopn}
\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