令y=PSL(2,2n),X为射影直线,B为GF*(2n)=GF(2n)/{0}的阶为d的子群,其中d〉5且当n/m为偶数时,d≠2m+1.通过确定(X,y(B))的参数集给出了一个单纯3-设计的无限族,并且证明了y(B)是惟一满足所构成的3-设计具有这种参数集的轨道.
Let y be PSL (2,2^n) , X be the projective line and B be any subgroup contained in GF^* (2^n) of order d, where d〉5 and d≠2^m+1 when n/m is even. An infinite family of simple 3-designs was given by determining the parameter set of (X, Cy(B)). It was proved that y(B) is the unique orbit such that (X,y5(B)) is a simple 3-design with that parameter set.