... z}∈H}. the electronic journal of combinatorics 10 (2003), #R18 2 The Turan Density of the Hypergraph {abc, ade, bde, cde}Zoltan FăurediDepartment of Mathematics, University of IllinoisUrbana, ... bothF3,2and F2,3and they are different. The extremal graph problem of F3,2originates from a Ramsey-Tur´an hypergraph paper of Erd˝os and T. S´os [2]. They investigated examples where the Tur´an ... Published: May 3, 20032000 Mathematics Subject Classification: 05C35, 05D05AbstractLet F3,2denote the 3-graph {abc, ade, bde, cde}. We show that the maximumsize of an F3,2-free 3-graph on n...