It is shown that the necessary conditions are sufficient for the existence of \(c\)-BRD(\(v, 3, \lambda\)) for all \(c \geq -1\). This was previously known for \(c = 0\) and for \(c = 1\).
Citation
Spencer P. Hurd, Dinesh G. Sarvate. All \(c\)-Bhaskar Rao Designs With Block Size \(3\) and \(c \geq -1\) Exist[J], Ars Combinatoria, Volume 059. 21-32. DOI: .