On the Congruence Subgroup Problem for integral group rings

Mauricio Caicedo, Ángel del Río

Let $G$ be a finite group, $\mathbb{Z}G$ the integral group ring of $G$ and $\U(\Z G)$ the group of units of $\mathbb{Z}G$. The Congruence Subgroup Problem for $\U(\Z G)$ is the problem of decid…