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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2006.12079math.AGmath.GRmath.KT
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乘法型群的一次Milnor $K$ -不变量

Degree One Milnor $K$-invariants of Groups of Multiplicative Type

Alexander Wertheim

摘要:

设$G$是域$F$上的交换仿射代数群,$H \colon \mathrm{Fields}_{F} \to \mathrm{AbGrps}$是函子. $G$的一个(同态)$H$ -不变量是一个自然变换$\mathrm{Tors}(-, G) \to H$,其中$\mathrm{Tors}(-, G)$是函子$\mathrm{Fields}_{F} \to \mathrm{AbGrps}$,它将一个域扩展$L/F$带到$\mathrm{Spec}(L)$上的$G_{L}$ -torors的同构类群。本文的目的是计算$H$的群$\mathrm{Inv}_{\mathrm{hom}}^{1}(G, H)$-$G$的不变量,当$G$是乘法型群时,$H$是$L^{\times} \otimes_{\mathbb{Z}} \mathbb{Q}/\mathbb{Z}$的域扩张$L/F$的函子.

英文摘要:

Let $G$ be a commutative affine algebraic group over a field $F$, and let $H \colon \mathrm{Fields}_{F} \to \mathrm{AbGrps}$ be a functor. A (homomorphic) $H$-invariant of $G$ is a natural transformation $\mathrm{Tors}(-, G) \to H$, where $\mathrm{Tors}(-, G)$ is the functor $\mathrm{Fields}_{F} \to \mathrm{AbGrps}$ taking a field extension $L/F$ to the group of isomorphism classes of $G_{L}$-torsors over $\mathrm{Spec}(L)$. The goal of this paper is to compute the group $\mathrm{Inv}_{\mathrm{hom}}^{1}(G, H)$ of $H$-invariants of $G$ when $G$ is a group of multiplicative type, and $H$ is the functor taking a field extension $L/F$ to $L^{\times} \otimes_{\mathbb{Z}} \mathbb{Q}/\mathbb{Z}$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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