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Article | REF: AF96 V1

Pretopology

Author: Jean-Charles PINOLI

Publication date: February 10, 2020, Review date: May 7, 2021

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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 cl(⋅) 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
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