本文主要考虑了一般投影线性群PGL(2,q)区传递作用下的4-(q+1,5,λ)设计的存在性问题。经讨论知λ的可能值是4。
In this paper, we consider the existence of the 4 - ( q + 1,5 ,λ) design admitting the block transitive automorphism groups PGL(2 ,q). After discussion, the possibility of λ is 4.