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Published in:
1996 | OriginalPaper | Chapter
An Excursion into General Topology
Author : S. S. Kutateladze
Published in: Fundamentals of Functional Analysis
Publisher: Springer Netherlands
Included in: Professional Book Archive
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Let X be a set. A mapping τ : X → ??(??(X)) is a pretopology on X if(1)x ∈ X ⇒ t(x) is a filter on X;(2)x ∈ X ⇒ t(x) ⊂ fil {x}