1993/11/15 by James E. Baumgartner, Baumgartner, James E.
Computer Science · Mathematics · #Advanced Algebra and Logic #Advanced Topology and Set Theory #FOS: Mathematics #Logic (math.LO) #Rings, Modules, and Algebras
paper · pdf · doi:10.48550/arxiv.math/9311206
openalex publication_date 1993/11/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
A variety of classes of naturally arising ultrafilters on omega is discussed, and the question is raised whether it is consistent that the classes are empty. Since all the classes contain the P-point ultrafilters, a negative answer would greatly extend the famous theorem of Shelah.