Form equivalence class Howard-Rubin Number: 14
Statement: Alexander's Subbase Lemma: A topological space iscompact if and only if there is a subbase \(S\) for the topologysuch that every cover by elements of \(S\) has a finite subcover.Kelley [1955] p 143, A.A. Lewis [1983], Wolk [1967], and Note 34.
Howard-Rubin number: 14 AA
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