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Topological PropertyIn topology and related areas of mathematics a topological property or topological invariant is a property of a topological space which is invariant under homeomorphisms. That is given two topological spaces X and Y and a homeomorphism f between them, a topological property for a subset A of X holds if and only if it holds for f(A). A common problem in topology is to decide whether two topological spaces are homeomorphic or not. To proof that two spaces are not homeomorphic it is sufficient to find a topological property which is not shared by them. Topological properties
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