The Hopfian Property of $n$-Periodic Products of Groups

S. I. Adian, V. S. Atabekyan

Let $H$ be a subgroup of a group $G$. A normal subgroup $N_H$ of $H$ is said to be inheritably normal if there is a normal subgroup $N_G$ of $G$ such that $N_H=N_G\cap H$. It is pr…