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Tournament minors. (English) Zbl 1310.05109
Summary: We say a digraph $$G$$ is a minor of a digraph $$H$$ if $$G$$ can be obtained from a subdigraph of $$H$$ by repeatedly contracting a strongly-connected subdigraph to a vertex. Here, we show that the class of all tournaments is a well-quasi-order under minor containment.

##### MSC:
 05C20 Directed graphs (digraphs), tournaments 05C83 Graph minors
##### Keywords:
digraph; tournament; minor; well-quasi-order
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##### References:
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