Abstract
The geometric Hopf invariant and the double point theorem are so natural that they have \(\pi \)-equivariant versions, for any discrete group \(\pi \), inducing the corresponding chain level constructions of non-simply-connected surgery obstruction theory. Following a brief recollection of \(\pi \)-equivariant S-duality, this section develops the \(\pi \)-equivariant geometric Hopf invariant, symmetric, quadratic etc. constructions.
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Crabb, M., Ranicki, A. (2017). The \(\pi \)-Equivariant Geometric Hopf Invariant. In: The Geometric Hopf Invariant and Surgery Theory. Springer Monographs in Mathematics. Springer, Cham. https://doi.org/10.1007/978-3-319-71306-9_7
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DOI: https://doi.org/10.1007/978-3-319-71306-9_7
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Publisher Name: Springer, Cham
Print ISBN: 978-3-319-71305-2
Online ISBN: 978-3-319-71306-9
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