In this article, we study symmetric designs admitting flag-transitive, point-imprimitive almost simple automorphism groups with socle sporadic simple groups. As a corollary, we present a classification of symmetric designs admitting flag-transitive automorphism group whose socle is a sporadic simple group, and in conclusion, there are exactly seven such designs, one of which admits a point-imprimitive automorphism group and the remaining are point-primitive.
@article{arxiv.2307.05184,
title = {Sporadic simple groups as flag-transitive automorphism groups of symmetric designs},
author = {Seyed Hassan Alavi and Ashraf Daneshkhah},
journal= {arXiv preprint arXiv:2307.05184},
year = {2023}
}