The Lie ring associated with certain groups
C0NTENTSIntroduction.................................................................................................................... 3§ 1. A subring theorem for free nilpotent Lie rings................................................. 10§ 2. The Lie ring associated with a free nilpotent group....................................... 20§ 3. Subrings which are associated with subgroups............................................ 27§ 4. Subgroups having the same Lie subring............................................................