locally finite group 20F50 5 20E15 4 20F19 4 self-normalizing subgroup 4 20F22 3 normal subgroup 3 2 20F16 2 20F18 2 Baer radical 2 Gruenberg radical 2 \(\mathrm{GNA}\)-subgroup 2 abnormal subgroup 2 ascendant subgroup 2 group 2 locally nilpotent residual 2 pronormal subgroup 2 subgroup 2 subnormal subgroup 2 20E26 1 20F26 1 20H20 1 Chernikov group 1 condition of normality 1 decomposable abelian subgroup 1 exponent 1 finitely generated group 1 generalized norms 1 group of Heineken-Mohamed type 1