Trade-offs among degree, diameter, and number of paths

Trade-offs among degree, diameter, and number of paths
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度数、直径和路径数量之间的权衡

DOI:
10.1016/j.dam.2022.12.007
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发表时间:
2023
影响因子:
1.1
通讯作者:
Kazuhisa Makino
Kazuhisa Makino
中科院分区:
数学3区
文献类型:
--
作者:
Toshimasa Ishii;Akitoshi Kawamura;Yusuke Kobayashi;Kazuhisa Makino

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度直径问题是极图理论中的一个基本问题,它涉及三个参数之间的权衡:最大度,直径和图中的顶点数。在本文中,我们引入了另一个参数,代表了网络的鲁棒性,并研究参数之间的权衡。对于正整数r和k,我们说一个图是(r,k)-连通的,如果它包含r个内部顶点不相交的路,其长度至多为k。考虑一个最大度为最小的n阶(r,k)-连通图.我们的贡献是证明了这样一个图的最大度的最小值是Θ(max {rnk,r}),这是一个与常数因子紧密相关的界.
The degree diameter problem is a fundamental and well-studied problem in extremal graph theory, which deals with trade-offs among three parameters: the maximum degree, the diameter, and the number of vertices in a graph. In this paper, we introduce another parameter that represents the robustness of a network and investigate trade-offs among the parameters. For positive integers r and k, we say that a graph is (r, k)-connected if it contains r internally vertex-disjoint paths of length at most k between any pair of vertices. We consider an (r, k)-connected graph with n vertices whose maximum degree is minimized. Our contribution is to show that the minimum of the maximum degree of such a graph is Θ (max {r n k, r}), which is a tight bound up to constant factors.
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