Disjoint Cycles in Directed Graphs on th
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G.L. Ding; A. Schrijver; P.D. Seymour
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Article
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1993
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Elsevier Science
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English
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We give necessary and sufficient conditions for a directed graph embedded on the torus or the Klein bottle to contain pairwise disjoint circuits, each of a given orientation and homotopy, and in a given order. For the Klein bottle, the theorem is new. For the torus, the theorem was proved before by