Yazar "Zhang, Y." seçeneğine göre listele

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    Adjoining cofinitary permutations
    (Association for Symbolic Logic, 1999) Zhang, Y.
    We show that it is consistent with ZFC + ¬CH that there is a maximal cofinitary group (or, maximal almost disjoint group) G ? Sym(?) such that G is a proper subset of an almost disjoint family A ? Sym(?) and |G| < |A|. We also ask several questions in this area.
  • Küçük Resim Yok
    Öğe
    Cofinitary groups, almost disjoint and dominating families
    (Association for Symbolic Logic, 2001) Hrušák, M.; Steprans, J.; Zhang, Y.
    In this paper we show that it is consistent with ZFC that the cardinality of every maximal cofinitary group of Sym(?) is strictly greater than the cardinal numbers d and a.