Embeddings of Maximal Tori in Classical Groups, Odd Degree Descent and Hasse Principles
Embeddings of Maximal Tori in Classical Groups, Odd Degree Descent and Hasse Principles
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最大托里在经典群中的嵌入、奇次下降和哈塞原理
DOI:
10.1007/s44007-021-00007-6
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发表时间:
2022
期刊:
影响因子:
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通讯作者:
Parimala, Raman
中科院分区:
文献类型:
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作者:
Bayer-Fluckiger, Eva;Lee, Ting-Yu;Parimala, Raman
The aim of this paper is to revisit the question of local–global principles for embeddings of étale algebras with involution into central simple algebras with involution over global fields of characteristic not 2. A necessary and sufficient condition is given in Bayer-Fluckiger et al. (J Eur Math Soc 20:137–163, 2018). In the present paper, we give a simpler description of the obstruction group. It is also shown that if the étale algebra is a product of pairwise linearly disjoint field extensions, then the Hasse principle holds, and that if an embedding exists after an odd degree extension, then it also exists over the global field itself. An appendix gives a generalization of this later result, in the framework of a question of Burt Totaro.