图的强制边绕道单音数

IF 0.6 Q3 MATHEMATICS Transactions on Combinatorics Pub Date : 2021-01-01 DOI:10.22108/TOC.2021.119182.1670
P. Titus, K. Ganesamoorthy
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引用次数: 0

摘要

对于至少为2阶的连通图$G=(V,E)$, $G$的边绕行单音集是$S$的顶点集合,使得$G$的每条边都位于连接$S$ $中某些顶点对的绕行单音路径上。$G$的边缘绕行单音数是其边缘绕行单音集的最小基数,用$edm(G)$™表示。$S$的子集$T$是$S$的强制边绕路单音子集,如果$S$是包含$T$的唯一边绕路单音集,其大小为$edm(G)$。最小基数$S$的强制边绕行单音子集是$S$的最小强制边绕行单音子集。$G$中的强制边绕行单音数$f_{edm}(S)$是$S$的最小强制边绕行单音子集的基数。$G$的强制边绕道单音数为$f_{edm}(G)=min{f_{edm}(S)}$ $,其中取$G$ $中大小为$edm(G)$的所有边绕道单音集$S$的最小值。我们确定了它的界,并找到了某些图类的强制边绕道单音数。证明了对于每一对正整数a, b, $0leq a
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Forcing edge detour monophonic number of a graph
‎For a connected graph $G=(V,E)$ of order at least two‎, ‎an edge detour monophonic set of $G$ is a set $S$ of vertices such that every edge of $G$ lies on a detour monophonic path joining some pair of vertices in $S$‎. ‎The edge detour monophonic number of $G$ is the minimum cardinality of its edge detour monophonic sets and is denoted by $edm(G)$‎. ‎A subset $T$ of $S$ is a forcing edge detour monophonic subset for $S$ if $S$ is the unique edge detour monophonic set of size $edm(G)$ containing $T$‎. ‎A forcing edge detour monophonic subset for $S$ of minimum cardinality is a minimum forcing edge detour monophonic subset of $S$‎. ‎The forcing edge detour monophonic number $f_{edm}(S)$ in $G$ is the cardinality of a minimum forcing edge detour monophonic subset of $S$‎. ‎The forcing edge detour monophonic number of $G$ is $f_{edm}(G)=min{f_{edm}(S)}$‎, ‎where the minimum is taken over all edge detour monophonic sets $S$ of size $edm(G)$ in $G$‎. ‎We determine bounds for it and find the forcing edge detour monophonic number of certain classes of graphs‎. ‎It is shown that for every pair a‎, ‎b of positive integers with $0leq a
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来源期刊
CiteScore
0.80
自引率
0.00%
发文量
2
审稿时长
30 weeks
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