Communications in Algebra, cilt.45, sa.3, ss.1012-1018, 2017 (SCI-Expanded)
Leibniz algebras are certain generalization of Lie algebras. In this paper, we give the classification of four-dimensional non-Lie nilpotent Leibniz algebras. We use the canonical forms for the congruence classes of matrices of bilinear forms and some other techniques to obtain our result.