两类自反有向平衡不完全区组设计的存在性

The Existence of two Types of Self-converse Directed BIBD

给出了一个递归构造 ,并且应用这个递归构造给出了区组长为 4,v≡ 2 ( mod1 2 )和υ≡ 6( mod1 2 )的 SCDB( 4 ,3;v) .

In this paper ,we give the proof of a recursive construction and the existence for self converse DB(4,3;v) when υ≡2,6(mod 12) via the recursive construction.