Let G be a finite group acting on a ring R and H a subgroup of G. In
this paper we compare some homological dimensions over the skew group rings
RG and RH. Moreover, under the assumption that RG is a separable
extension over RH, we show that the skew group rings RG and RH share some
properties such as being n-Gorenstein, n-perfect, n-coherent, (n,d),
Ding-Chen or IF-rings