Lindelof Spaces Concentrated on Bernstein Subsets of the Real Line

L. Brian Lawrence
1992 Proceedings of the American Mathematical Society  
We show in ZFC that for each n with new or n = w , there is a Lindelöf space X and a separable metric space M such that for every m < n , X x mM is Lindelöf, whereas X x "M is nonnormal.
doi:10.2307/2159803 fatcat:x5axygmzdzcrniepgnzbrnbcqm