2 problems

Let a quasi-symmetric 2-design be a 2-design whose block graph is $K_{m\times n}$, the complete multipartite graph with $m$ parts of size $n$. Write the associated strongly resolva…

A strongly resolvable 2-design is a 2-design whose block graph has the form $K_{m\times n}$, the complete multipartite graph with $m$ parts of size $n$. The parameters of such a de…