5. Particular points and subsets
5.1 Special points
5.1.1 Indoor and outdoor membership points
In any pre-topological space (E,cl), adherent points to a subset X of E are points belonging to cl(X), interior points to a subset X of E are points belonging to int(X), and exterior points to a subset X of E are points belonging to ext(X) (i.e. to int(X c )) (p. 278 of
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Particular points and subsets
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