Form equivalence class Howard-Rubin Number: 67
Statement: If \((X,T)\) is a \(T_4\) topological space and \(U =\{U_i: i\in K\}\) is a family of non-empty open sets, then there is afamily \(V = \{V_i: i\in K\}\) of non-empty closed (compact) sets suchthat \(U_i \supseteq V_i\) for each \(i\in K\). Keremedis [1997].
Howard-Rubin number: 67 J
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