On a hypergraph Turan problem of Frankl

Peter Keevash, Benny Sudakov

Let $C_r^{2k}$ be the $2k$-uniform hypergraph obtained by letting $P_1,...,P_r$ be pairwise disjoint sets of size $k$ and taking as edges all sets $P_i\cup P_j$ with $i\ne j$. T…