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Springer’s Odd Degree Extension Theorem for quadratic forms over semilocal rings
Indagationes Mathematicae ( IF 0.5 ) Pub Date : 2021-07-05 , DOI: 10.1016/j.indag.2021.06.009 Philippe Gille 1 , Erhard Neher 2
中文翻译:
半局域环上二次型的斯普林格奇数扩展定理
更新日期:2021-07-05
Indagationes Mathematicae ( IF 0.5 ) Pub Date : 2021-07-05 , DOI: 10.1016/j.indag.2021.06.009 Philippe Gille 1 , Erhard Neher 2
Affiliation
A fundamental result of Springer says that a quadratic form over a field of characteristic is isotropic if it is so after an odd degree field extension. In this paper we generalize Springer’s theorem as follows. Let be an arbitrary semilocal ring, let be a finite -algebra of constant odd degree, which is étale or generated by one element, and let be a nonsingular -quadratic form whose base ring extension is isotropic. We show that then already is isotropic.
中文翻译:
半局域环上二次型的斯普林格奇数扩展定理
Springer 的一个基本结果表明,特征域上的二次型 是各向同性的,如果在奇数场扩展之后是这样。在本文中,我们将 Springer 定理概括如下。让 是一个任意的半局域环,令 成为一个有限的 - 常数奇次的代数,它是étale 或由一个元素生成,让 成为一个非奇异的 -二次形式,其基环延伸 是各向同性的。我们证明,那么已经 是各向同性的。