11. Pre-topological spaces with 3 axioms
11.1 Fréchet's pre-topological spaces
Definition (Fréchet's pre-topological space (1917)). A Fréchet's pre-topological space (E,cl) is a non-empty set E with a pre-closure operator satisfying the axioms (K Gr ), (K Iso ) and (K Ext ) (p. 359 of
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Pre-topological spaces with 3 axioms
4 axiom pre-topological spaces
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