10. Pre-topological spaces with 2 axioms
10.1 Day's pre-topological spaces
Definition (Day's pre-topological space (1940)). A Day's pre-topological space is a non-empty set E with a pre-closure operator satisfying the axioms (K Gr ) and (K Iso ) (p. 190 of
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Pre-topological spaces with 2 axioms
Pre-topological spaces with 3 axioms
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