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arXiv math/0402187math.GRmath.NT
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与一个二元关系相容的对应关系,涉及Galois群L3(2)的扩展和Noether对L3(2)的问题

Correspondances compatibles avec une relation binaire, relevement d'extensions de groupe de Galois L3(2) et probleme de Noether pour L3(2)

J. -F. Mestre

摘要:

本文证明了:对于F_2上的射影平面P^2(2)所表示的不定系(X_a),存在与P^2(2)的关联结构相容的3-3对应,使得(X_a)是它的轨道之一.本文给出了这一构造的两个应用:1)对于域k上的任意k[X]中的任意广义多项式P. 0,使得它的伽罗瓦群是L3(2)((=L2(7))的一个子群,存在k[X]中的Q使得在k(T)上P-TQ的伽罗瓦群是L3(2).这特别暗示了k上L3(2)的所谓“算术提升性质”。2)对于具有伽罗瓦群L3(2)的7次多项式,存在一个含7个参数的通有多项式.这相当于L3(2)作用在P^2(2)的7个点上的Noether问题有一个正解。

英文摘要:

We prove that for a system of indeterminates (X_a) indiced by the P^2(2), the projective plane over F_2, there exists a 3-3 correspondance compatible with the incidence structures of P^2(2), such that (X_a) is one of the orbits of it. We give two applications of this construction : 1) for any sufficientely general polynomial P in k[X] over a field k of car. 0, such that its Galois group is a subgroup of L3(2) ((=L2(7)), there exists Q in k[X] such that the Galois group of P-TQ over k(T) is L3(2). This implies in particular the so-called "arithmetical lifting property" for L3(2) over k. 2) There exists a generic polynomial in 7 parameters for polynomials of degree 7 with Galois group L3(2). This is equivalent to the fact that the Noether's problem for L3(2) acting over the seven points of P^2(2) has a positive answer.

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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