•  58
    Remarks on a class of almost disjoint families
    Bulletin of the Section of Logic 30 (1): 1-13. 2001.
  •  92
    Towards a Problem of E. van Douwen and A. Miller
    Mathematical Logic Quarterly 45 (2): 183-188. 1999.
    We discuss a problem asked by E. van Douwen and A. Miller [5] in various forcing models
  • On the Voice and Spirit of the Poetry of Prime Tang Dynasty
    with Chun-Qing Sun
    Nankai University (Philosophy and Social Sciences) 6 47-52. 2005.
    "The Voice of the Tang Dynasty," the strong voice of the times, the pride of Tang, Gao Bing in "Poetry is the sound" touted in the "Rhythm pure finish" is a refined aesthetic qualities of Tang poetry, established the Ming Dynasty. " Tang poetry must be "the aesthetic ideal. Ming Tang on the physical tone, trying to implement Sheng Tang wonderful rhyme poems for the rule-based method, resulting in obtaining the fur and missing the spirit of the abuse. If designed as Fengshen on the rise and poetr…Read more
  •  165
    On a Class of M.A.D. Families
    Journal of Symbolic Logic 64 (2): 737-746. 1999.
    We compare several closely related continuum invariants, i.e., $\mathfrak{a}$, $\mathfrak{a}_\mathfrak{e}$, $\mathfrak{a}_\mathfrak{p}$ in two forcing models. And we shall ask some open questions in this field.
  •  79
    Maximal cofinitary groups
    Archive for Mathematical Logic 39 (1): 41-52. 2000.
    We discuss the cardinalities of maximal cofinitary groups under the assumption of $\neg CH$ . We also discuss various open questions in this area
  •  21
    Adjoining cofinitary permutations
    Archive for Mathematical Logic 42 (2): 153-163. 2003.
    We construct several forcing models in each of which there exists a maximal cofinitary group, i.e., a maximal almost disjoint group, G≤Sym, such that G is also a maximal almost disjoint family in Sym. We also ask several open questions in this area in the fourth section of this paper.
  •  155
    Adjoining cofinitary permutations
    Journal of Symbolic Logic 64 (4): 1803-1810. 1999.
    We show that it is consistent with ZFC + ¬CH that there is a maximal cofinitary group (or, maximal almost disjoint group) G ≤ Sym(ω) such that G is a proper subset of an almost disjoint family A $\subseteq$ Sym(ω) and |G| < |A|. We also ask several questions in this area
  •  225
    Adjoining Almost Disjoint Permutations
    Mathematical Logic Quarterly 48 (2): 189-193. 2002.
    We show that it is consistent with ZFC + ¬CH that there is a maxima a most disjoint permutation family A ⊆ Symsuch that A is a proper subset of an eventually different family E ⊆ ℕℕ and |A| < |E|. We also ask severa questions in this area
  •  173
    Cofinitary groups, almost disjoint and dominating families
    with Michael Hrusak and Juris Steprans
    Journal of Symbolic Logic 66 (3): 1259-1276. 2001.
    In this paper we show that it is consistent with ZFC that the cardinality of every maximal cofinitary group of Sym(ω) is strictly greater than the cardinal numbers o and a