On minimum balanced bipartitions of triangle-free graphs

On minimum balanced bipartitions of triangle-free graphs
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关于无三角形图的最小平衡二分

DOI:
10.1007/s10878-012-9539-y
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发表时间:
2014-04
影响因子:
1
通讯作者:
许宝刚
许宝刚
中科院分区:
数学4区
文献类型:
--
作者:
李海燕;Liang Yanting;刘木伙;许宝刚

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图G的平衡二分划是将V(G)划分为两个子集V1和V2,这两个子集的基数相差至多1。G的一个最小平衡二分划是G的一个平衡二分划V1,V2 minimizinge(V1,V2),其中(V1,V2)是连接V1和V2的边数,通常称为二分划的大小。本文证明了:每一个2-连通图G都有一个平衡的二分图V1,V2,使得G的由V1和V2诱导的子图都是连通的。这产生了一个很好的上界的最小平衡二分割的稀疏图的大小。我们还提出了无三角形图的最小平衡二分划的大小的两个上界,这两个上界使Fan等人(Discrete Math.312:1077-1083,2012)的相应界变得尖锐。
Abalanced bipartitionof a graphGis a partition ofV(G) into two subsetsV1andV2that differ in cardinality by at most 1. Aminimum balanced bipartitionofGis a balanced bipartitionV1,V2ofGminimizinge(V1,V2), wheree(V1,V2) is the number of edges joiningV1andV2and is usually referred to as thesizeof the bipartition. In this paper, we show that every 2-connected graphGadmits a balanced bipartitionV1,V2such that the subgraphs ofGinduced byV1and byV2are both connected. This yields a good upper bound to the size of minimum balanced bipartition of sparse graphs. We also present two upper bounds to the size of minimum balanced bipartitions of triangle-free graphs which sharpen the corresponding bounds of Fan et al. (Discrete Math. 312:1077–1083, 2012).
DOI: 10.1016/j.jctb.2013.06.002
发表时间: 2011-09
期刊: ArXiv
影响因子: --
作者:
Choongbum Lee;Po-Shen Loh;B. Sudakov
通讯作者: Choongbum Lee;Po-Shen Loh;B. Sudakov
DOI: --
发表时间: 2002
期刊: Electron. Colloquium Comput. Complex.
影响因子: --
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DOI: 10.4018/978-1-5225-9380-5.ch014
发表时间: 2020
期刊: Handbook of Research on Advanced Applications of Graph Theory in Modern Society
影响因子: --
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DOI: 10.1016/j.disc.2011.11.030
发表时间: 2012-03
期刊: Discret. Math.
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