摘要
Throughout the text, the term 'difference set' means 'cyclic difference set'. Let D（v, k, λ） be the set of all （v, k, λ.）-difference sets. Two difference sets D1 and D2 in D（v, k, λ,） are said to be equivalent, denoted by D1～D2, if there are integers i and s （gcd （t, v）=1） such that D2≡tD1+s （mod v）. Since the relation '～' is a equivalence relation on the set D（v, k, λ）, we can partition the set D(v,
