Extremal (r, λ)-designs

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Abstract

It is known that a non-trivial (r, λ)-design cannot have more than the max {(r- λ)2+(r-Gl)+ 1,λ+2 varieties. In this paper we investigate the structure of (r,λ)-designs containing the maximum number of varieties. From this investigation we obtain some results on irreducible (r,λ)-designs.

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