Complete Classification of Flag-Transitive Point一Primitive ) `) u% r2 p* r 2-Designs with Socle % J! d6 X* g% v' x: W8 I" F) e& f % m6 }! |& @( c/ P$ R4 Y" p In recent years several authors have determined some 2-designs with flag-transitive point-primitive automorphism group G of almost simple type with sporadic socle. Here we obtain the complete classification of flag-transitive point-primitive non-trivial 2-designs with socle Mli,and find that there are precisely 14 such nonisomorphic 2-designs.* K/ h. I. x+ q0 ^
$ Y8 S* C9 t: F" H Keywords 2-design; flag-transitive; point-primitive; Mathieu group 2 @7 O ] A i$ ~% R ) l5 g% B/ V5 q5 v! Z