Cycle Lengths in a Permutation are Typically Poisson

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Cycle Lengths in a Permutation are Typically Poisson

The set of cycle lengths of almost all permutations in Sn are “Poisson distributed”: we show that this remains true even when we restrict the number of cycles in the permutation. The formulas we develop allow us to also show that almost all permutations with a given number of cycles have a certain “normal order” (in the spirit of the Erdős-Turán theorem). Our results were inspired by analogous ...

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A special class of cubic graphs are the cycle permutation graphs. A cycle permutation graph Pn(α) is defined by taking two vertex-disjoint cycles on n vertices and adding a matching between the vertices of the two cycles.In this paper we determine a good upper bound for tenacity of cycle permutation graphs.

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A Note on Cycle Lengths in Graphs

We prove that for every c > 0 there exists a constant K = K(c) such that every graph G with n vertices and minimum degree at least cn contains a cycle of length t for every even t in the interval [4, ec(G)−K] and every odd t in the interval [K, oc(G)−K], where ec(G) and oc(G) denote the length of the longest even cycle in G and the longest odd cycle in G respectively. We also give a rough estim...

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Let C(G) denote the set of lengths of cycles in a graph G. In the first part of this paper, we study the minimum possible value of |C(G)| over all graphs G of average degree d and girth g. Erdős [7] conjectured that |C(G)| = Ω ( d ) for all such graphs, and we prove this conjecture. We also show that this is a lower bound for the number of odd cycle lengths in a graph of chromatic number d and ...

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on the tenacity of cycle permutation graph

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ژورنال

عنوان ژورنال: The Electronic Journal of Combinatorics

سال: 2006

ISSN: 1077-8926

DOI: 10.37236/1133