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Oriented cycles in digraphs of large outdegree

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arxiv 2008.13224 v1 pith:EF3KXKX4 submitted 2020-08-30 math.CO

Oriented cycles in digraphs of large outdegree

classification math.CO
keywords everyconjecturedigraphaboulkercontainsdigraphsexistsleast
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In 1985, Mader conjectured that for every acyclic digraph $F$ there exists $K=K(F)$ such that every digraph $D$ with minimum out-degree at least $K$ contains a subdivision of $F$. This conjecture remains widely open, even for digraphs $F$ on five vertices. Recently, Aboulker, Cohen, Havet, Lochet, Moura and Thomass\'{e} studied special cases of Mader's problem and made the following conjecture: for every $\ell \geq 2$ there exists $K = K(\ell)$ such that every digraph $D$ with minimum out-degree at least $K$ contains a subdivision of every orientation of a cycle of length $\ell$. We prove this conjecture and answer further open questions raised by Aboulker et al.

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