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Tag Archives: four colour theorem
Topology: Finite Intersection Property (Omake)
The whole point of this article is the following seemingly trivial observation. Theorem. A topological space X is compact if and only if it satisfies theĀ finite intersection property (F.I.P.): if is a collection of closed subsets of X such that … Continue reading
Posted in Notes
Tagged advanced, compact spaces, finite intersection property, four colour theorem, topology
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