Chang's Conjectures and Easton collapses
Using Easton collapses, we give a simplified construction of a model in which Chang's Conjecture for triples holds.
math.LO↗
arXiv subjects
Masahiro Shioya
Publications and source records attributed to Masahiro Shioya.
Nonreflecting stationary sets in P_kappa(lambda)
Let kappa be a regular uncountable cardinal and lambda >=kappa^+ . The principle of stationary reflection for P_kappa lambda has been successful in settling problems of infinite combinatorics in the case kappa=omega_1. For a greater kappa the principle is known to fail at some lambda. This note shows that it fails at every lambda if kappa is the successor of a regular uncountable cardinal or kappa is countably closed.
math.LO↗