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3. The four axiomatics of topological spaces
Topological spaces are classically defined by one of the following four equivalent axiomatics
3.1 Axioms relating to the open
A topological space can be introduced on an ambient set E via a collection of particular subsets called "open" such that :
Definition (topological space, axioms for open sets). A topological space is a pair
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The four axiomatics of topological spaces
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