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A note on powers of Hamilton cycles in generalized claw-free graphs

机译:关于广义无爪图中Hamilton圈的幂的注记

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Seymour conjectured for a fixed integer k ≥ 2 that if G is a graph of order n with δ(G) ≥ kn/(k + 1), then G contains the kth power Ck n of a Hamiltonian cycle Cn of G, and this minimum degree condition is sharp. Earlier the k = 2 case was conjectured by Pósa. This was verified by Komlós et al. [4]. For s ≥ 3, a graph is K1,s-free if it does not contain an induced subgraph isomorphic to K1,s. Such graphs will be referred to as generalized clawfree graphs. Minimum degree conditions that imply that a generalized claw-free graph G of sufficiently large order n contains a kth power of a Hamiltonian cycle will be proved. More specifically, it will be shown that for any ε> 0 and for n sufficiently large, any K1,s-free graph of order n with δ(G) ≥ (1/2 + ε)n contains a Ckn.
机译:对于固定整数k≥2的西摩猜想,如果G是阶数为n的图,且δ(G)≥kn /(k + 1),则G包含G的哈密顿循环Cn的第k次幂Ck n,并且最低学位条件是尖锐的。早前k = 2的案例是由Pósa猜想的。 Komlós等人对此进行了验证。 [4]。对于s≥3,如果图不包含与K1,s同构的诱导子图,则该图是无K1,s的。这样的图将被称为广义无爪图。将证明暗示足够大阶数的广义无爪图G包含哈密顿循环的k次方的最小程度条件。更具体地说,将显示出,对于任何ε> 0和足够大的n,任何具有δ(G)≥(1/2 +ε)n的n阶的无K1,s无图都包含Ckn。

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