Seminars & Colloquia Calendar

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Logic Seminar

Forcing a universal triangle free graph in aleph_1 without CH

Saharon Shelah of HUJI and Rutgers University

Location:  HILL 705
Date & time: Monday, 16 October 2017 at 5:00PM - 6:00PM

Abstract: This is on [F1340] Earlier results say that consistently there are aleph_2 < continuum graphs ! each of size aleph_1 which form a universal family. See work with Dzamonja [614]. and [457].  Here we use a forcing which is halfway between CS. product. and  CS  iteration. We also discuss the method in related cases

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