16S90 4 20E15 4 20F22 4 radical 4 radical group 4 soluble group 4 16D90 3 20E34 3 20F19 3 20F50 3 Jacobson radical 3 locally nilpotent radical 3 18E40 2 derivation 2 finite special rank 2 locally nilpotent residual 2 periodic group 2 pronormal subgroup 2 self-normalizing subgroup 2 subnormal subgroup 2 superoxide radicals 2 transitively normal subgroups 2 $J$-symmetric ring 1 (closed 1 (generalized) radical group 1 (pre\emph)radical 1 06F35,03G25 1 11T71 1 12H99 1 13C99 1