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    Almost disjoint sets

    FF-NOX4C

    Almost disjoint means the interiors do not meet.Suggest a slogan

    Let \(X\) be a topological space. Subsets \(A, B\subseteq X\) are almost disjoint if and only if \(A^\circ \cap B^\circ = \emptyset\).

    What are almost disjoint sets?

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