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新疆大学数学与系统科学学院
Published:2015
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[1]齐豪,艾尔肯·吾买尔.图的生成可圈性(英文)[J].新疆大学学报(自然科学版),2015,32(03):292-296.
[1]齐豪,艾尔肯·吾买尔.图的生成可圈性(英文)[J].新疆大学学报(自然科学版),2015,32(03):292-296. DOI: 10.13568/j.cnki.651094.2015.03.008.
DOI:10.13568/j.cnki.651094.2015.03.008.
给定一个图G=(V
E)及其顶点集V的互不相交的非空子集A1
A2
···
Ar
如果存在互不相交的圈C1
C2
···
Cr满足Ai?V(Ci)(i=1
2
···
r)并且C1∪C2∪···∪Cr生成G
则称G是关于子集A1
A2
···
Ar生成可圈的.如果G关于V的任意r个互不相交的子集A1
A2
···
Ar都是生成可圈的
则称G是r-生成可圈的.进一步
如果G对于任意满足|A1∪A2∪···∪Ar|≤t的互不相交的点子集A1
A2
···
Ar是r-生成可圈的
则称G是阶数为t的r-生成可圈图.本文中
我们证明了:如果G是顶点数n≥3r+1
边数m≥(n-1)(n-2)2+k+r-2(r≥1
3≤k≤n-r+1)的图
则G是阶数为k+r-3的r-生成可圈图.本文将文献[1]中r=2的结果推广到了一般的情形.
Given a graph G =(V
E) and mutually disjoint nonempty subsets A1
A2
...
Arof V
we say that G is spanning cyclable with respect to A1
A2
· · ·
Arif there exist mutually disjoint cycles C1
C2
· · ·
Crsuch that AiV(Ci)for i = 1
2
· · ·
r and C1∪ C2∪ · · · ∪ Crspans G. And G is r-spanning-cyclable if G is spanning cyclable with respect to A1
A2
...
Arfor every such mutually disjoint nonempty subsets of V. Moreover
we say that G is r-spanning-cyclable of order t if G is spanning cyclable with respect to A1
A2
· · ·
Arfor any r nonempty mutually disjoint subsets A1
A2
· · ·
Ar of V such that |A1∪ A2∪ · · · ∪ Ar| ≤ t. In this paper we prove if G is a graph of order n ≥ 3r + 1(r ≥ 1) and has at least(n-1)(n-2)2+ k + r-2edges for 3 ≤ k ≤ n- r + 1
then G is r-spanning-cyclabe of order k + r- 3. Our result extends the resultobtained by Cheng et al. in [1] for r = 2.
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