A ZFC Dowker space in $\aleph_{\omega+1}$: an application of pcf theory to topology.

by Kojman and Shelah. [KjSh:609]
Proc American Math Soc, 1998
A Dowker space is a normal Hausdorff topological space whose product with the unit interval is not normal. Using pcf theory we construct a Dowker space of cardinality aleph_{omega +1} .

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