Spanning k-Trees of n-Connected Graphs

Spanning k-Trees of n-Connected Graphs
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DOI:
10.1007/s00373-011-1021-6
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发表时间:
2011-05
影响因子:
0.7
通讯作者:
M. Kano;Hiroo Kishimoto
M. Kano;Hiroo Kishimoto
中科院分区:
数学4区
文献类型:
--
作者:
M. Kano;Hiroo Kishimoto

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如果一棵树的最大度为mostk,则称其为AK-树。我们证明了下面的定理,利用这个定理可以定义n-连通图的生成k-树的闭包概念。设≥_2和n_≥_1为整数,其中|G|≥|−_1−(k_−_2)n,其中|G|表示图G的阶数,其中|G|表示图G的阶数。则G有spanningk-树当且仅IFG+uv有spanningk-树。
A tree is called ak-tree if the maximum degree is at mostk. We prove the following theorem, by which a closure concept for spanningk-trees ofn-connected graphs can be defined. Letk≥ 2 andn≥ 1 be integers, and letuandvbe a pair of nonadjacent vertices of ann-connected graphGsuch that degG(u) + degG(v) ≥ |G| − 1 − (k− 2)n, where |G| denotes the order ofG. ThenGhas a spanningk-tree if and only ifG+uvhas a spanningk-tree.