Form equivalence class Howard-Rubin Number: 67
Statement: DUU: If \(C\) is a collection of pairwisedisjoint topological spaces each of which satisfies Urysohn'slemma, then the disjoint union of the spaces in \(C\) satisfiesUrysohn's lemma. Howard/Keremedis/Rubin/Rubin [1998a]and Note 141.
Howard-Rubin number: 67 L
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