Abstract
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.
Citation
Paul Balmer. Ivo Dell’Ambrogio. Beren Sanders. "Restriction to finite-index subgroups as étale extensions in topology, KK–theory and geometry." Algebr. Geom. Topol. 15 (5) 3023 - 3045, 2015. https://doi.org/10.2140/agt.2015.15.3025
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