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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.

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© 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.

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