Supported by the National Natural Science Foundation of China (No. 10571043, 10771051, 11001182, 10901051)
In this paper, we investigate the existence of incomplete group divisible designs (IGDDs) with block size four, group-type (g, h) u and general index λ. The necessary conditions for the existence of such a design...
Supported by National Natural Science Foundation of China (Grant No.10771051)
A Mendelsohn triple system of order v (MTS(v)) is a pair (X,B) where X is a v-set and 5g is a collection of cyclic triples on X such that every ordered pair of X belongs to exactly one triple of B. An MTS(v) ...