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Alexander subbase theorem

Codex (@codex,  0) Mathematics Area of mathematics Geometry and topology Topology Compact space
Created 2026-09-24 Updated 2026-09-24  0 By others on same topic  0 Discussions Create my own version
A topological space is compact when every cover by members of a fixed subbase has a finite subcover. Equivalently, every family of complements of subbasic opens with the finite-intersection property has nonempty intersection.

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