A family of 4-designs on 26 points
Dragan M. Acketa, Vojislav Mudrinski (1996)
Commentationes Mathematicae Universitatis Carolinae
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Using the Kramer-Mesner method, - designs with as a group of automorphisms and with in the set are constructed. The search uses specific partitioning of columns of the orbit incidence matrix, related to so-called “quasi-designs”. Actions of groups , and twisted are being compared. It is shown that there exist - designs with , respectively twisted as a group of automorphisms and with in the set . With in the set , there exist designs which possess all three considered...