Form equivalence class Howard-Rubin Number: 8
Statement: \(DUCCC\) +Form 131.\(DUCCC\) is ``If \(X\) is a denumerable family of disjoint topologicalspaces each having the ccc property, then the disjoint union of thespaces in \(X\) has the ccc property.'' (\(Y\) has the ccc property ifevery collection of disjoint open sets is countable.)Keremedis [1998b] and Note 132.
Howard-Rubin number: 8 O
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