Form equivalence class Howard-Rubin Number: 1
Statement:
Every open cover \(\cal{U}\) of a metric space \((X,d)\) can be written as a well ordered union \(\bigcup\{U_\alpha :\alpha\in\gamma\}\) where \(\gamma\) is an ordinal and each \(U_\alpha\) is pairwise disjoint. Howard/Keremedis/Rubin/Stanley [1999].
Howard-Rubin number: 1 BK
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