Existence of almost free abelian groups and reflection of stationary set [article]

Saharon Shelah
1996 arXiv   pre-print
section 2: We answer a question of Mekler Eklof on the closure operations of the incompactness spectrum. We answer a question of Foreman and Magidor on reflection of stationary subsets of S_< aleph_2(lambda) = a subseteq lambda : |a| < aleph_2]. section 3 - NPT is not transitive. We prove NPT(lambda, mu) + NPT(mu, kappa) not => NPT(lambda, kappa)
arXiv:math/9606229v1 fatcat:bjbhvslzhnbl3pcgqdupevhx6m