Deses, D.; de Groot-Van der Voorde, A.; Lowen-Colebunders, E.(Universitat Politècnica de València, 2003-10-01)
[EN] A closure space X is a set endowed with a closure operator P(X) → P(X), satisfying the usual topological axioms, except finite additivity. A T1 closure extension Y of a closure space X induces a structure ϒ on X ...