2-(边)连通图的3点彩虹索引

Yingbin Ma, Wenhan Zhu
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引用次数: 0

摘要

设[公式:见文本]为顶点颜色的图形。对于至少有两个顶点的顶点集[公式:见文],连接[公式:见文]中的[公式:见文]的树[公式:见文]是顶点彩虹,如果[公式:见文]中没有两个顶点具有相同的颜色,这样的树称为顶点彩虹[公式:见文]-树或连接[公式:见文]的顶点彩虹树。设[公式:见文]为与[公式:见文]的固定整数,如果[公式:见文]的每个[公式:见文]的[公式:见文]子集[公式:见文]都有一个顶点-彩虹[公式:见文]-树,则[公式:见文]被称为顶点-彩虹[公式:见文]-树连接。图[公式:见文]的[公式:见文]-顶点-彩虹索引[公式:见文]是使[公式:见文]顶点-彩虹[公式:见文]-树连通所需的最小颜色数。在本文中,我们主要关注[公式:见文本]。当[Formula: see text]为[Formula: see text]-connected或[Formula: see text]-edge-connected时,我们分别为[Formula: see text]提供一个锐利的上界,并确定图[Formula: see text],其中[Formula: see text]达到上界。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The 3-Vertex-Rainbow Index of 2-(Edge) Connected Graphs
Let [Formula: see text] be a vertex-colored graph. For a vertex set [Formula: see text] of at least two vertices, a tree [Formula: see text] that connects [Formula: see text] in [Formula: see text] is vertex-rainbow if no two vertices of [Formula: see text] have the same color, such a tree is called a vertex-rainbow [Formula: see text]-tree or a vertex-rainbow tree connecting [Formula: see text]. Let [Formula: see text] be a fixed integer with [Formula: see text], [Formula: see text] is said to be vertex-rainbow [Formula: see text]-tree connected if every [Formula: see text]-subset [Formula: see text] of [Formula: see text] has a vertex-rainbow [Formula: see text]-tree. The [Formula: see text]-vertex-rainbow index [Formula: see text] of a graph [Formula: see text] is the minimum number of colors are needed in order to make [Formula: see text] vertex-rainbow [Formula: see text]-tree connected. In this paper, we focus on [Formula: see text]. When [Formula: see text] is [Formula: see text]-connected or [Formula: see text]-edge-connected, we provide a sharp upper bound for [Formula: see text], respectively, and determine the graphs [Formula: see text], where [Formula: see text] reaches the upper bound.
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