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SPRINGER'S ODD DEGREE EXTENSION THEOREM FOR QUADRATIC FORMS OVER SEMILOCAL RINGS

Abstract : A fundamental result of Springer says that a quadratic form over a field of characteristic not 2 is isotropic if it is so after an odd degree extension. In this paper we generalize Springer's theorem as follows. Let R be a an arbitrary semilocal ring, let S be a finite R-algebra of constant odd degree, which is étale or generated by one element, and let q be a nonsingular R-quadratic form whose base ring extension q S is isotropic. We show that then q is already isotropic.
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https://hal-cnrs.archives-ouvertes.fr/hal-03124810
Contributor : Philippe Gille Connect in order to contact the contributor
Submitted on : Friday, June 18, 2021 - 4:22:32 PM
Last modification on : Saturday, September 24, 2022 - 3:36:05 PM

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Philippe Gille, Erhard Neher. SPRINGER'S ODD DEGREE EXTENSION THEOREM FOR QUADRATIC FORMS OVER SEMILOCAL RINGS. Indagationes Mathematicae, inPress, ⟨10.1016/j.indag.2021.06.009⟩. ⟨hal-03124810v2⟩

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