Circular flow on signed graphs

Circular flow on signed graphs
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带符号图上的循环流

DOI:
10.1016/j.jctb.2011.02.007
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发表时间:
2011-11
期刊:
Journal of Combinatorial Theory - Series B
影响因子:
--
通讯作者:
Xuding Zhu
Xuding Zhu
中科院分区:
其他
文献类型:
--
作者:
Andre Raspaud;Xuding Zhu

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符号图(G,Φ)的圈流数σc(G,σ)是指(G,σ)的方向允许有圈r-流的最小r。证明了带符号图(G,σ)的循环流数等于(G,σ)的最小方向不平衡率。然后利用这一结果证明了如果G是4边连通的,且(G,σ)没有零流,则Φc(G,σ)(以及Φ(G,σ))至多为4.如果G是6边连通的,且(G,σ)没有零流,则Φc(G,σ)严格小于4.
The circular flow number Φc(G,σ) of a signed graph (G,σ) is the minimum r for which an orientation of (G,σ) admits a circular r-flow. We prove that the circular flow number of a signed graph (G,σ) is equal to the minimum imbalance ratio of an orientation of (G,σ). We then use this result to prove that if G is 4-edge-connected and (G,σ) has a nowhere zero flow, then Φc(G,σ) (as well as Φ(G,σ)) is at most 4. If G is 6-edge-connected and (G,σ) has a nowhere zero flow, then Φc(G,σ) is strictly less than 4.
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影响因子: --
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