"Intermediate notions between [[fully invariant subgroup]] and [[characteristic direct factor of abelian group]]","Intermediate notions between [[fully invariant subgroup]] and [[characteristic direct factor of abelian group]]#"
"Abelian fully invariant subgroup","Abelian fully invariant subgroup"
"Characteristic direct factor of nilpotent group","Characteristic direct factor of nilpotent group"
"Fully invariant direct factor","Fully invariant direct factor"