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  1. Set Theory: On the Structure of the Real Line.T. Bartoszyński & H. Judah - 1999 - Studia Logica 62 (3):444-445.
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  • Ramsey ultrafilters and the reaping number—con(r.M. Goldstern & S. Shelah - 1990 - Annals of Pure and Applied Logic 49 (2):121-142.
    We show that it is consistent that the reaping number r is less than u , the size of the smallest base for an ultrafilter. To show that our forcing preserves certain ultrafilters, we prove a general partition theorem involving Ramsey ideals.
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  • Con(u>i).Saharon Shelah - 1992 - Archive for Mathematical Logic 31 (6):433-443.
    We prove here the consistency of u>i where: u=Min{|X|:X⫅P(ω) generates a non-principle ultrafilter}, i=Min{|A|:A is a maximal independent family of subsets of ω}In this we continue Goldstern and Shelah [G1Sh388] where Con(r>u) was proved using a similar but different forcing. We were motivated by Vaughan [V] (which consists of a survey and a list of open problems). For more information on the subject see [V] and [G1Sh388].
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