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Orientations and detachments of graphs with prescribed degrees and connectivity?

机译:具有指定程度和连通性的图的方向和分离?

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摘要

We give a necessary and sufficient condition for a graph to have an orientation that has k edge-disjoint arborescences rooted at a designated vertex s subject to lower and upper bounds on the in-degree at each vertex. The result is used to derive a characterization of graphs having a detachment that contains k edge-disjoint spanning trees. Efficient algorithms for finding those orientations and detachments are also described. In particular, the paper provides an algorithm for finding a connected (loopless) detachment in O(nm) time, improving on the previous best running time bound, where n and m denote the numbers of vertices and edges, respectively.
机译:我们给图提供一个必要和充分的条件,使图的方向具有k个边缘不相交的树状结构,其根源于指定的顶点s,并受每个顶点的度数的下限和上限的限制。结果用于导出具有包含k个边缘不相交的生成树的分离的图的特征。还描述了用于找到那些方向和分离的有效算法。特别是,本文提供了一种算法,用于发现O(nm)时间中的连接(无环)脱离,并改进了先前的最佳运行时间界限,其中n和m分别表示顶点和边的数量。

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