arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1701.01129math.NT
收藏

指定次数的丢番图逼近

Diophantine approximation in prescribed degree

Johannes Schleischitz

摘要:

本文研究了用代数数和指定次数的代数整数逼近给定实数的问题。我们处理最好的和一致逼近,并突出的相似性和差异相比,深入研究的问题,逼近的代数数(和整数)的有界程度。我们建立了一个问题的答案Bugeaud关于近似超越实数的二次无理数,从而我们完善了达文波特和施密特从1967年的结果。我们还得到了Liouville数的几个新的刻画,以及对非齐次丢番图逼近的一些新的认识.作为一个辅助的边的结果,我们提供了一个上界的数量的某些线性组合的两个给定的互素整数多项式的线性因子。最后,我们提出几个悬而未决的问题。

英文摘要:

We investigate approximation to a given real number by algebraic numbers and algebraic integers of prescribed degree. We deal with both best and uniform approximation, and highlight the similarities and differences compared with the intensely studied problem of approximation by algebraic numbers (and integers) of bounded degree. We establish the answer to a question of Bugeaud concerning approximation to transcendental real numbers by quadratic irrational numbers, and thereby we refine a result of Davenport and Schmidt from 1967. We also obtain several new characterizations of Liouville numbers, and certain new insights on inhomogeneous Diophantine approximation. As an auxiliary side result, we provide an upper bound for the number of certain linear combinations of two given relatively prime integer polynomials with a linear factor. We conclude with several open problems.

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。

↑