Classical involution theorem

In mathematical finite group theory, the classical involution theorem of classifies simple groups with a classical involution and satisfying some other conditions, showing that they are mostly groups of Lie type over a field of odd characteristic. extended the classical involution theorem to groups of finite Morley rank.
A classical involution "t" of a finite group "G" is an involution whose centralizer has a subnormal subgroup containing "t" with quaternion Sylow 2-subgroups.