Abstract

SYNOPTIC ABSTRACTSeveral methods for constructing generalized group divisible designs with two classes and blocksize three are presented. Two constructions of completely symmetric designs are also given. All of the constructed designs achieve a lower bound on the diagonal elements of their information matrices required for E- and MV-optimality arguments; for most of the designs these optimalities are established. Difference techniques and the finite fields play key roles, as do idempotent and half-idempotent Latin squares.

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