Abstract
AbstractLet be a nontrivial symmetric ‐design with , and let be a flag‐transitive automorphism group of . In this paper, we show that if is quasiprimitive on , then is of holomorph affine or almost simple type. Moreover, if is imprimitive on , then is of almost simple type. According to this observation and to the classification of the finite simple groups we determine all such symmetric designs and the corresponding automorphism groups. We conclude with two open problems and a conjecture.
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