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2 % Standard topological operations.
5 % Needed for \operatorname.
10 % The ``interior of'' operator.
11 \newcommand*
{\interior}[1]{ \operatorname{int
}\of{{#1}} }
13 % The ``closure of'' operator.
14 \newcommand*
{\closure}[1]{ \operatorname{cl
}\of{{#1}} }
16 % And the ``boundary of'' operator.
17 \newcommand*
{\boundary}[1]{ \operatorname{bdy
}\of{{#1}} }