The Quasivariety Generated by a Free Nilpotent Group
摘要
We prove that the quasivariety qF(𝒩c) generated by the free non-abelian c-step nilpotent group (c ≥ 4) contains a continuum of quasivarieties. All quasivarieties contained in qF(𝒩3) are described.