Full reflection of stationary sets below alephomega
Thomas Jech, Saharon Shelah
math.LOarXiv:math/9201242
Abstract
It is consistent that for every n >= 2, every stationary subset of omegan consisting of ordinals of cofinality omegak where k = 0 or k <= n-3 reflects fully in the set of ordinals of cofinality omegan-1. We also show that this result is best possible.
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