Form equivalence class Howard-Rubin Number: 67
Statement: \(A(A2,H2)\): For every \(T_2\) topological space \((X,T)\)if \((X,T)\) is A2, then \((X,T)\) is hereditarily \(A2\). (\((X,T)\) is A2 meansif \(U\subseteq T\) covers \(X\) then \(\exists f:X\rightarrow T\) such thatfor all \(x\in X\), \(x\in f(x)\) and \(f\)"\(X\) refines \(U\).)Brunner [1983d] and Note 26.
Howard-Rubin number: 67 A
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