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Digraphs contractible onto $^{*} K_{3}$

Stefan Janaqi; François Lescure; M. Maamoun; Henry Meyniel — 1998

Mathematica Bohemica

We show that any digraph on $n \geq 3$ vertices and with not less than $3 n - 3$ arcs is contractible onto $^{*} K_{3}$ .

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