Group divisible designs with block size 4 and group sizes 4 and 7

R. Julian R. Abel, Thomas Britz, Yudhistira A. Bunjamin +1

In this paper, we consider the existence of group divisible designs (GDDs) with block size $4$ and group sizes $4$ and $7$. We show that there exists a 4-GDD of type $4^t{7}^s$ for…