Combinatorial and hybrid principles for sigma-directed families of countable sets modulo finite

Details Combinatorial and hybrid principles for sigma-directed families of countable sets modulo finite Combinatorial and hybrid principles for sigma-directed families of countable sets modulo finite

2007-06-26

arxiv.org/abs/0706.3729v2

Mathematics

Logic

1) Minor revisions. 2) Sharpened results by replacing the notion of a "global strategy" (see Definition 2.9)

Scientific paper

We consider strong combinatorial principles for sigma-directed families of countable sets in the ordering by inclusion modulo finite, e.g. P-ideals of countable sets. We try for principles as strong as possible while remaining compatible with CH, and we also consider principles compatible with the existence of nonspecial Aronszajn trees. The main thrust is towards abstract principles with game theoretic formulations. Some of these principles are purely combinatorial, while the ultimate principles are primarily combinatorial but also have aspects of forcing axioms.

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