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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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