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On the vertex-pancyclicity of hypertournaments

机译:关于超竞赛的顶点全循环

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摘要

A k-hypertournament H on n vertices, where 2≤k≤n, is a pair H=(V,A_H), where V is the vertex set of H and A_H is a set of k-tuples of vertices, called arcs, such that, for all subsets S?V with |S|=k, A_H contains exactly one permutation of S as an arc. Gutin and Yeo (1997) showed in [2] that any strong k-hypertournament H on n vertices, where 3≤k≤n-2, is Hamiltonian, and posed the question as to whether the result could be extended to vertex-pancyclicity. As a response, Petrovic and Thomassen (2006) in [4] and Yang (2009) in [6] gave some sufficient conditions for a strong hypertournament to be vertex-pancyclic. In this paper, we prove that, if H is a strong k-hypertournament on n vertices, where 3≤k≤n-2, then H is vertex-pancyclic. This extends the aforementioned results and Moon's theorem for tournaments. Furthermore, our result is best possible in the sense that the bound k≤n-2 is tight.
机译:n个顶点上的k个超级锦标赛H,其中2≤k≤n是对H =(V,A_H),其中V是H的顶点集,而A_H是一组k个顶点的元组,称为圆弧,这样,对于| S | = k的所有子集S?V,A_H恰好包含S的一个置换作为弧。 Gutin和Yeo(1997)在[2]中指出,n个顶点上的任何强k-超曲线H(3≤k≤n-2)是哈密顿量,并提出了一个问题,即结果是否可以扩展到顶点-泛环性。作为回应,Petrovic和Thomassen(2006)在[4]中和Yang(2009)在[6]中给出了使强超锦标赛成为顶点泛环的一些充分条件。在本文中,我们证明,如果H是n个顶点上的强k-超锦标赛,其中3≤k≤n-2,则H是顶点-泛环。这扩展了上述结果和锦标赛的Moon定理。此外,在约束k≤n-2严格的意义上说,我们的结果是最好的。

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