Form equivalence class Howard-Rubin Number: 126
Statement: DUT(\(\omega\)): If \(C\) is a countable collectionof pairwise disjoint topological spaces each of which satisfiesthe Tietze-Urysohn extension theorem, then the disjoint unionof the spaces in \(C\) satisfies the Tietze-Urysohn extension theorem.Howard/Keremedis/Rubin/Rubin [1998a] and Note 141.
Howard-Rubin number: 126 I
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