Daily Archives: September 10, 2021

2021-14 Perfectly normal product

Let X, Y be compact spaces. Suppose \(X \times Y\) is perfectly normal, i.e, for every disjoint closed subsets E, F in \(X \times Y\), there exists a continuous function \( f: X \times Y \to [0, 1] \subset \mathbb{R} \) such that \( f^{-1}(0) = E, f^{-1}(1) = F \). Is it true that at least one of X and Y is metrizable?

(added Sep. 11, 8AM: Assume further that \( X \times Y\) is Hausdorff.)

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