On the index of a free abelian subgroup in the group of central units of an integral group ring

Gurmeet K. Bakshi, Sugandha Maheshwary

Let $\mathcal{Z}(\mathcal{U}(\mathbb{Z}[G]))$ denote the group of central units in the integral group ring $\mathbb{Z}[G]$ of a finite group $G$. A bound on the index of the subgro…