Abstract:
Let $L(M)$ be a class of all groups $G$ in which the normal
closure of any element belongs to $M$; $qM$ is a quasivariety
generated by a class $M$.
We consider a quasivariety $qH_2$ generated by a relatively free
group in a class of nilpotent groups of class at most $2$ with
commutator subgroup of exponent $2$. It is proved that the Levi
class $L(qH_2)$ generated by the quasivariety $qH_2$ is contained in
the variety of nilpotent groups of class at most $3$.
Keywords:group, nilpotent group, variety,
quasivariety, Levi class.