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arXiv 1702.01969math.AG
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广义Picard-Vessiot扩张与微分Galois上同调

Generalized Picard-Vessiot extensions and differential Galois cohomology

Zoe Chatzidakis, Anand Pillay

摘要:

在较早的文件证明,如果一个微分领域$(K,δ)$是代数封闭和封闭的皮卡德Vessiot扩展,然后每一个微分代数主齐性空间在K上的线性微分代数群G在K有一个K-有理点(事实上当且仅当)。本文探讨了这是否可以推广到(a)多个导子,(b)一个自同构,如果可以,如何推广。在“广义Picard-Vessiot扩张”(多导子情形)的自然概念下,给出了一个反例.我们也有一个反例的情况下,一个自同构。我们还制定和证明了一些积极的声明的情况下,几个导子。

英文摘要:

In an earlier paper it was proved that if a differential field $(K,δ)$ is algebraically closed and closed under Picard-Vessiot extensions then every differential algebraic principal homogeneous space over K for a linear differential algebraic group G over K has a K-rational point (in fact if and only if). This paper explores whether and if so, how, this can be extended to (a) several derivations, (b) one automorphism. Under a natural notion of "generalized Picard-Vessiot extension" (in the case of several derivations), we give a counterexample. We also have a counterexample in the case of one automorphism. We also formulate and prove some positive statements in the case of several derivations.

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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