Restriction to finite-index subgroups as étale extensions in topology, KK–theory and geometry
- Author(s): Balmer, P;
- Dell’Ambrogio, I;
- Sanders, B
- et al.
Published Web Locationhttps://arxiv.org/abs/1408.2524
For equivariant stable homotopy theory, equivariant KK–theory and equivariant derived categories, we show how restriction to a subgroup of finite index yields a finite commutative separable extension, analogous to finite étale extensions in algebraic geometry.