Author

Boaz Tsaban

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Preprint Sep 2026

A solution of the D-space Problem

Settling a central problem in set-theoretic topology, and many related problems, we prove that there is, consistently, a regular Lindel\"of space of cardinality $\aleph_1$ that is not a D-space. The existence of such a space is independent of ZFC; we establish its equivalence to a weak form of the Continuum Hypothesis....

Boaz Tsaban · 0 citations