UC Santa Cruz
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
© 2015, Mathematical Sciences Publishers. All rights reserved. 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.