polo - topology

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topology We know noe from "Topology" by Munkres, Lemma 23.2. Page 149 that $\forall x \in X$ is $\x\ \times \y\^c$ either completely in $W$ or completely in $V$. We define thus $A := \ x \in X | \x\ \times \y\^c \subset V$ and $B :=\ x \in X | \x\ \times \y\^c \subset W$. It is now evident that $A \cup B = X$ and that $A \cap B

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