On optimality of designs with three distinct eigenvalues

M. R. Faghihi, E. Ghorbani, G. B. Khosrovshahi +1

Let $\D_{v,b,k}$ denote the family of all connected block designs with $v$ treatments and $b$ blocks of size $k$. Let $d\in\D_{v,b,k}$. The replication of a treatment is the number…