The projective symplectic group
is the Group obtained from the Symplectic Group on factoring by the Scalar Matrices contained in that Group.
is Simple except for
References
Conway, J. H.; Curtis, R. T.; Norton, S. P.; Parker, R. A.; and Wilson, R. A.
``The Groups and
.'' §2.3 in
Atlas of Finite Groups: Maximal Subgroups and Ordinary Characters for Simple Groups. Oxford, England:
Clarendon Press, pp. x-xi, 1985.