新疆大学数学与系统科学学院
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[1]汪亚蒙,依明江·沙比尔.图的生成宽直径(英文)[J].新疆大学学报(自然科学版中英文),2024,41(05):571-578+590.
[1]汪亚蒙,依明江·沙比尔.图的生成宽直径(英文)[J].新疆大学学报(自然科学版中英文),2024,41(05):571-578+590. DOI: 10.13568/j.cnki.651094.651316.2023.11.21.0001.
DOI:10.13568/j.cnki.651094.651316.2023.11.21.0001.
图G中两个顶点u和v之间的一个t-container Ct(u
v)是u和v之间的t-条内部不交路的集合
即Ct(u
v)={P1
P2
···
Pt}.进一步
如果V(P1)∪V(P2)∪···∪V(Pt)=V(G)
那么Ct(u
v)称为生成t-container
记作C tsc(u
v).用l(Ctsc(u
v))=max{l(Pi)|1≤i≤t}表示C tsc(u
v)={P1
P2
···
Pt}的长度.图G是生成t-连通的
如果任意两个顶点u和v之间存在一个生成t-container.设u和v是生成t-连通图G中的两个不同的顶点
Dtsc(u
v)是图G中所有C tsc(u
v)的集合
则u和v之间的生成t-宽距离定义为dtsc(u
v)=min{l(Ctsc(u
v))|Ctsc(u
v)∈Dtsc(u
v)}
图G的生成t-宽直径定义为Dtsc(G)=max{dtsc(u
v)|u
v∈V(G)}.特别的
图G的生成宽直径是D_κsc(G)
其中κ是图G的连通度.得到了一般图的生成宽直径的上下界
并证明了界是最优的.除此之外
确定了Harary图、广义Petersen图等常见图类的生成宽直径的精确值.
A t-container Ct(u
v) is a set of t internally disjoint paths between two distinct vertices u and v in a graph G
i.e.
Ct(u
v)={P1
P2
···
Pt}.Moreover
if V(P1)∪V (P2)∪···∪V (Pt)=V (G) then Ct(u
v) is called a spanning t-container
denoted by Ctsc(u
v).The length of Ctsc(u
v)={P1
P2
···
Pt}is l(Ctsc(u
v))=max{l(Pi)|1≤i≤t}.A graph G is spanning t-connected if there exists a spanning t-container between any two distinct vertices u and v in G.Assume that u and v are two distinct vertices in a spanning t-connected graph G.Let Dtsc(u
v) be the collection of all Ctsc(u
v)'s.Define the spanning t-wide distance between u and v in G
dtsc(u
v)=min{l(Ctsc(u
v))|Ctsc(u
v)∈Dtsc(u
v)}
and the spanning t-wide diameter of G
Dtsc(G)=max{dtsc(u
v)|u
v∈V (G)}.In particular
the spanning wide diameter of G is D_κsc(G)
whereκis the connectivity of G.In the paper we provide the upper and lower bounds of the spanning wide diameter of a graph
and show that the bounds are best possible.We also determine the exact values of wide diameters of some well known graphs including Harary graphs and generalized Petersen graphs et al..
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