13. Pre-topological spaces with 5 axioms
13.1 Kuratowski's pre-topological spaces
Definition (Kuratowski's pre-topological space (1922)). A Kuratowski's pre-topological space (E,cl) is a non-empty set E with a pre-closure operator satisfying the axioms (K Gr ), (K Iso ), (K Ext ), (K subfuAd ) and (K subid ) (p. 13 of
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Pre-topological spaces with 5 axioms
Applications between pre-topological spaces
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