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arXiv 0712.1785math.NTmath.AG
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数域中的非方集是丢番图

The set of non-squares in a number field is diophantine

Bjorn Poonen

摘要:

修复一个数字字段k。我们证明了k* - k*^2是k上的丢番图。这是从一个定理推导出来的,即对于k[x]中的一个非常数可分多项式P(x),在k* 模平方中至多有200个a,使得对于由y^2 - az^2 = P(x)给出的圆锥丛X的哈塞原理存在Brauer-Manin障碍。

英文摘要:

Fix a number field k. We prove that k* - k*^2 is diophantine over k. This is deduced from a theorem that for a nonconstant separable polynomial P(x) in k[x], there are at most finitely many a in k* modulo squares such that there is a Brauer-Manin obstruction to the Hasse principle for the conic bundle X given by y^2 - az^2 = P(x).

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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