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Cycles through arcs in multipartite tournaments and a conjecture of Volkmann

✍ Scribed by Hongwei Li; Shengjia Li; Yubao Guo; Qiaoping Guo


Publisher
Elsevier Science
Year
2011
Tongue
English
Weight
213 KB
Volume
24
Category
Article
ISSN
0893-9659

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✦ Synopsis


Volkmann [L. Volkmann, A remark on cycles through an arc in strongly connected multipartite tournaments, Appl. Math. Lett. 20 (2007Lett. 20 ( ) 1148Lett. 20 ( -1150] ] conjectured that a strong c-partite tournament with c β‰₯ 3 contains three arcs that belong to a cycle of length m for each m ∈ {3, 4, . . . , c}. In this work, we prove that Volkmann's conjecture is true.


πŸ“œ SIMILAR VOLUMES


A remark on cycles through an arc in str
✍ Lutz Volkmann πŸ“‚ Article πŸ“… 2007 πŸ› Elsevier Science 🌐 English βš– 140 KB

A multipartite or c-partite tournament is an orientation of a complete c-partite graph. In this note we prove that a strongly connected c-partite tournament with c β‰₯ 3 contains an arc that belongs to a directed cycle of length m for every m ∈ {3, 4, . . . , c}.

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## Abstract An in‐tournament is an oriented graph such that the negative neighborhood of every vertex induces a tournament. Let __m__ = 4 or __m__ = 5 and let __D__ be a strongly connected in‐tournament of order ${{n}}\geq {{2}}{{m}}-{{2}}$ such that each arc belongs to a directed path of order at

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## Abstract A set __S__ of edge‐disjoint hamilton cycles in a graph __G__ is said to be __maximal__ if the edges in the hamilton cycles in __S__ induce a subgraph __H__ of __G__ such that __G__β€‰βˆ’β€‰__E__(__H__) contains no hamilton cycles. In this context, the spectrum __S__(__G__) of a graph __G__ i

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It was conjectured in [Wang, to appear in The Australasian Journal of Combinatorics] that, for each integer k β‰₯ 2, there exists . This conjecture is also verified for k = 2, 3 in [Wang, to appear; Wang, manuscript]. In this article, we prove this conjecture to be true if n β‰₯ 3k, i.e., M (k) ≀ 3k. W