% Standard topological operations.
%
+% Needed for \operatorname.
+\usepackage{amsopn}
+
\input{mjo-common}
% The ``interior of'' operator.
-\newcommand*{\interior}[1]{ \operatorname{int} \of{{#1}} }
+\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 operator.
-\newcommand*{\boundary}[1]{ \partial \of{{#1}} }
+% And the ``boundary of'' operator.
+\newcommand*{\boundary}[1]{ \operatorname{bdy}\of{{#1}} }