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Combinatorics/graph theory: Digraphs and cycles 
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Jan913, 12:38 PM

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Hi,
How would you go about proving the following statement? Let k:= ∂+(D) with k≥ 1. Then D contains a cycle of length at least k+1. ∂+(D) is the minimum out degree of any vertex in digraph D. Thanks a lot, Will 


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