Abstract:
We study the structure of primitive $m$-groups in the variety of normal-valued $m$-groups. We prove that $\mathscr{U(V}_1\lor \mathscr V_2)=\mathscr{UV}_1\lor\mathscr{UV}_2$ for arbitrary varieties of $m$-groups $\mathscr U$, $\mathscr V_1$ and $\mathscr V_2$.