A new generalization of Mantel's theorem to k-graphs

Let the k-graph Fank consist of k edges that pairwise intersect exactly in one vertex x, plus one more edge intersecting each of these edges in a vertex different from x. We prove that, for n sufficiently large, the maximum number of edges in an n-vertex k-graph containing no copy of Fank is k i=1 n+i−1 k , which equals the number of edges in a complete k-partite k-graph with almost equal parts. This is the only extremal example. This result is a special case of our more general theorem that applies to a larger class of excluded configurations.

• Type: Journal
• Year: 2007
• Where: JCT
• Authors: Dhruv Mubayi, Oleg Pikhurko
• Keywords: Complete K-partite K-graph, JCT 2007, K-graph Fank, Maximum Number