Virtual rational Betti numbers of nilpotent-by-abelian groups

Behrooz Mirzaii, Fatemeh Yeganeh Mokari

In this paper we study virtual rational Betti numbers of a nilpotent-by-abelian group $G$, where the abelianization $N/N^{\prime }$ of its nilpotent part $N$ satisfies certain tameness prop…