A family of two generator non-Hopfian groups

Donghi Lee, Makoto Sakuma

We construct $2$-generator non-Hopfian groups $G_m,m=3,4,5,\dots$, where each $G_m$ has a specific presentation $G_m=\langle a, b \, | \, u_{r_{m,0}}=u_{r_{m,1}}=u_{r_{m,2}}= \…