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【期刊论文】Notes on Chvatal’s conjecture
王毅, WANG Yi
Discrete Mathematics,-0001,():
-1年11月30日
Using Kleitman’s lemma and results of Sch2onheim and Miklos it is shown that if w(D)=|D|/2, then every maximum-sized intersecting family in D contains all base elements of D. Then, the converse of this statement is conjectured and shown that this is equivalent to that of Chvatal.
Downsets,, Intersecting families,, Stars
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【期刊论文】Proof of a Conjecture of Ehrenborg and Steingrímsson on Excedance Statistics
王毅, WANG Yi
European Journal of Combinatorics,-0001,():
-1年11月30日
We give an affirmative answer to a conjecture of Ehrenborg and Steingrimsson on the general log-concavity of the excedance statistics.
Permutations,, Excedance sets,, Log-concavity,,
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【期刊论文】On the unimodality of independence polynomials of some graphs
王毅, WANG Yi, ZHU Bao-Xuan
European Journal of Combinatorics,-0001,():
-1年11月30日
In this paper we study unimodality problems for the independence polynomial of a graph, including unimodality, log-concavity and reality of zeros. We establish recurrence relations and give factorizations of independence polynomials for certain classes of graphs. As applications we settle some unimodality conjectures and problems.
Unimodality,, Real zeros,, Independence polynomials
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