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A Gersten–Witt complex for hermitian Witt groups of coherent algebras over schemes, I: Involution of the first kind

Published online by Cambridge University Press:  26 March 2007

Stefan Gille
Affiliation:
Mathematisches Institut, Universität München, Theresienstrasse 39, 80333 München, Germany [email protected]
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Abstract

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Let $X$ be a noetherian scheme with dualizing complex and ${\mathcal{A}}$ a coherent ${\mathcal O}_{X}$-algebra with involution of the first kind $\tau$. We develop in this work a coherent hermitian Witt theory for $({\mathcal{A}},\tau)$. As an application we construct a Gersten–Witt spectral sequence which converges to the coherent hermitian Witt theory of $({\mathcal{A}},\tau)$. We show then that the associated Gersten–Witt complex is exact if $X$ is the spectrum of a smooth semilocal ring and ${\mathcal{A}}$ is locally free as ${\mathcal O}_{X}$-module.

Type
Research Article
Copyright
Foundation Compositio Mathematica 2007