"Intermediate notions between [[2-subnormal subgroup]] and [[normal subgroup]]","Intermediate notions between [[2-subnormal subgroup]] and [[normal subgroup]]#"
"2-hypernormalized subgroup","2-hypernormalized subgroup"
"Central factor of normal subgroup","Central factor of normal subgroup"
"Direct factor of normal subgroup","Direct factor of normal subgroup"
"Join-transitively 2-subnormal subgroup","Join-transitively 2-subnormal subgroup"
"Modular 2-subnormal subgroup","Modular 2-subnormal subgroup"
"Normal subgroup of characteristic subgroup","Normal subgroup of characteristic subgroup"
"Permutable 2-subnormal subgroup","Permutable 2-subnormal subgroup"
"Transitively normal subgroup of normal subgroup","Transitively normal subgroup of normal subgroup"