On flag-transitive symmetric (v, k, 4) designs
摘要
In this paper, we study nontrivial symmetric (v, k, 4) designs admitting a flag-transitive and point-primitive affine automorphism group. In conclusion, all symmetric (v, k, 4) designs admitting flag-transitive automorphism groups are known apart from those admitting one-dimensional automorphisms, and hence the classification of flag-transitive symmetric (v, k, 4) designs reduces to the case of one-dimensional affine automorphism groups.