Foundation item: the National Natural Science Foundation of China (No. 10671055); the Natural Science Foundation of Hebei Province (No. A2007000230); the Foundation of Hebei Normal University (No. L2007B22).
In this paper, we discuss the G-decomposition of λKv into 6-circuits with two chords. We construct some holey G-designs using sharply 2-transitive group, and present the recursive structure by PBD. We also give a uni...
the National Natural Science Foundation of China (No. 10671005); the Natural Science Foundation of Hebei Province (No. A2007000230).
In this paper, we introduce the concept of the general butterfly graph B[m,n;d] for integers m,n ≥ 3, d ≥ 1, determine its balance index set, and give the necessary and sufficient condition for balanced graph B[m,n;...