signalizer functor is a mapping from a potential finite subgroup to the centralizers of the nontrivial elements of an abelian group. The signalizer functor...

odd The signalizer functor method for odd primes. The main problem is to prove a signalizer functor theorem for nonsolvable signalizer functors. This was...

recognized, in addition to his own research contributions such as work on signalizer functors, as a leader in directing the classification of finite simple groups...

especially effective in the exceptional cases where components or signalizer functors are not applicable. Aschbacher, Michael (2000), Finite Group Theory...