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\import{set.tex}
\import{set/cons.tex}
\import{set/symdiff.tex}
\import{set/product.tex}
\import{set/powerset.tex}
\import{set/bipartition.tex}
\import{set/partition.tex}
\import{set/cantor.tex}
\import{set/filter.tex}
\import{set/fixpoint.tex}
\import{relation.tex}
\import{relation/properties.tex}
\import{order/quasiorder.tex}
\import{relation/equivalence.tex}
\import{relation/closure.tex}
\import{relation/uniqueness.tex}
\import{function.tex}
\import{ordinal.tex}
\import{nat.tex}
\import{cardinal.tex}
\import{algebra/magma.tex}
\import{algebra/semigroup.tex}
\import{algebra/monoid.tex}
\import{algebra/quasigroup.tex}
\import{algebra/loop.tex}
\import{order/order.tex}
\import{order/semilattice.tex}
\import{topology/topological-space.tex}
\import{topology/basis.tex}
\import{topology/disconnection.tex}
\import{topology/separation.tex}
\begin{proposition}\label{trivial}
$\emptyset = \emptyset$.
\end{proposition}
\begin{proof}
Follows by \cref{emptyset}.
\end{proof}
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