On the existence of super-simple designs with block size 4

Abstract

We prove that forv = 1 and for allv ≡ 1 (mod 3),v ≥ 10, there is a (v, 4, 4) design with the property that no triple appears in more than one block. The proof of this result is made more difficult by the non-existence of a GDD (4, 4, 3; 15) with no triple appearing in more than one block. We also show that forv = 1 and for allv ≡ 1, 4 (mod 12),v ≥ 13, there is a (v, 4, 2) design with this property, and with the additional property that the design is the union of two (v, 4, 1) designs.