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Generalized topological spaces. (English) Zbl 0533.54001
The author introduces a new generalization of topological spaces by considering idempotent, but multivalued closure operators. He characterizes closed and open sets by neighbourhoods, the duality between ”open” and ”closed” given by complementation as usually. As examples for the open sets may be mentioned: the subalgebras of a universal algebra, the convex subsets of a poset and the connected subsets of a connected topological space.
Reviewer: B.Behrens

54A05 Topological spaces and generalizations (closure spaces, etc.)
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