normal subgroup 20F16 2 20F18 2 20F19 2 20F22 2 abnormal subgroup 2 locally finite group 2 pronormal subgroup 2 self-normalizing subgroup 2 (generalized) radical group 1 20E15 1 20E28 1 20E32 1 20E34 1 20F24 1 20F50 1 20H20 1 Chernikov group 1 Hall subgroup 1 \(GNA\)-subgroup 1 \(\mathrm{GNA}\)-subgroup 1 commutator subgroup 1 derived subgroup 1 finite group 1 group 1 locally finite radical 1 locally graded group 1 locally nilpotent radical 1 locally nilpotent residual 1 nilpotent subgroup 1