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Bounded degree acyclic decompositions of digraphs. (English) Zbl 1033.05087
Summary: An acyclic decomposition of a digraph is a partition of the edges into acyclic subgraphs. Trivially every digraph has an acyclic decomposition into two subgraphs. It is proved that for every integer \(s \geqslant 2\) every digraph has an acyclic decomposition into \(s\) subgraphs such that in each subgraph the outdegree of each vertex \(v\) is at most \(\left\lceil \frac {\text{deg}(v)}{s-1} \right\rceil\). For all digraphs this degree bound is optimal.

MSC:
05C70 Edge subsets with special properties (factorization, matching, partitioning, covering and packing, etc.)
05C20 Directed graphs (digraphs), tournaments
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