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首页> 外文期刊>Journal of Combinatorial Theory, Series B >Pancyclicity of Hamiltonian and highly connected graphs
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Pancyclicity of Hamiltonian and highly connected graphs

机译:哈密​​顿图和高连通图的泛循环性

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A celebrated theorem of Chvátal and Erdo{double acute}s says that G is Hamiltonian if κ(G)>α(G), where κ(G) denotes the vertex connectivity and α(G) the independence number of G. Moreover, Bondy suggested that almost any non-trivial conditions for Hamiltonicity of a graph should also imply pancyclicity. Motivated by this, we prove that if κ(G)>600α(G) then G is pancyclic. This establishes a conjecture of Jackson and Ordaz up to a constant factor. Moreover, we obtain the more general result that if G is Hamiltonian with minimum degree δ(G)>600α(G) then G is pancyclic. Improving an old result of Erdo{double acute}s, we also show that G is pancyclic if it is Hamiltonian and n>150α(G)3. Our arguments use the following theorem of independent interest on cycle lengths in graphs: if δ(G)>300α(G) then G contains a cycle of length ? for all 3
机译:Chvátal和Erdo {double急性} s的一个著名定理说,如果κ(G)>α(G),则G是哈密顿量,其中κ(G)表示顶点连通性,而α(G)表示G的独立数。邦迪建议,图的汉密尔顿性的几乎所有非平凡条件也应暗示泛环性。由此证明,如果κ(G)>600α(G),则G为泛环。这就建立了杰克逊和奥尔达兹的猜想,直到一个恒定的因子。此外,我们得到了更普遍的结果,如果G是最小度δ(G)>600α(G)的哈密顿量,则G是全环。改善Erdo {double急性} s的旧结果,我们还表明,如果G是哈密顿量且n>150α(G)3,则它是泛环的。我们的论点在图中使用以下关于周期长度的独立关注定理:如果δ(G)>300α(G),则G包含一个长度为?的周期。对于所有3 <δ<δ(G)/ 81。

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