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We consider An extremal problem for directed graphs which is closely related to Tutin's theorem giving the maximum number of edges in a gr;lph on n vertices which does not contain a complete subgraph on m vertices. and edge set {(i. j): 1 s i C j s n]. A subgraph H of T,, is said to be m-locally unipathic when the restriction of H to each m element subset(More)
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