“…In the recent papers [9,11,12] authors approached the relative theory of Leibniz algebras with respect to the Liezation functor, yielding to the introduction of new notions of central extensions, capability, nilpotency, stem cover, isoclinism and Schur multiplier relative to the Liezation functor, the so-called Lie-central extensions, Lie-capability, Lie-nilpotency, Lie-stem cover, Lie-isoclinism and Schur Lie-multiplier.…”