20E15 4 20F19 4 abnormal subgroups 4 pronormal subgroups 4 20E34 3 20F22 3 pronormal subgroup 3 20F16 2 20F18 2 abnormal subgroup 2 arrangement of subgroups 2 fan subgroups 2 normal subgroup 2 normal subgroups 2 radical group 2 self-normalizing subgroup 2 (generalized) radical group 1 2019 1 20E15,20E34,20F19,20F22 1 20F19,20F22 1 20F50 1 Carter subgroups 1 \(GNA\)-subgroup 1 \(\mathrm{GNA}\)-subgroup 1 contranormal subgroup 1 locally finite group 1 locally finite radical 1 locally graded group 1 locally nilpotent group 1 locally nilpotent radical 1