On multipliers of torsion-free nilpotent groups

The notion of the Schur multiplier is carried over to torsion-free nilpotent groups of finite rank, and the relation between the rank of a torsion-free nilpotent group and the rank of its multiplier is determined, 3].Translated from Matematicheskie Zametki, Vol. 5, No. 5, pp. 541–544, May, 1969.