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arXiv 0906.3535math.COmath.GR
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可解群的Freiman定理

Freiman's theorem for solvable groups

Terence Tao

摘要:

弗赖曼定理断言,粗略地说,如果一个无挠阿贝尔群中的有限集有小的加倍,那么它可以有效地包含在(或控制)一个广义等差数列中。这是一般的绿色和Ruzsa任意阿贝尔群,其中控制对象现在是陪集进展。我们将这些结果进一步推广到有界导出长度的可解群,其中陪集级数被更复杂的“陪集零级数”概念所取代。作为这个结果的一个结果,这样的一个可解群的任何子集的小倍是由一个集,其迭代产品多项式增长,并包含在一个虚拟的幂零群群。作为另一个应用,我们建立了一个加强的Milnor-Wolf定理,所有的可解群的多项式增长几乎是幂零的,其中只有一个大球需要多项式的大小。这一结果补充了Breulliard-Green,Fisher-Katz-Peng和Sanders最近的工作。

英文摘要:

Freiman's theorem asserts, roughly speaking, if that a finite set in a torsion-free abelian group has small doubling, then it can be efficiently contained in (or controlled by) a generalised arithmetic progression. This was generalised by Green and Ruzsa to arbitrary abelian groups, where the controlling object is now a coset progression. We extend these results further to solvable groups of bounded derived length, in which the coset progressions are replaced by the more complicated notion of a "coset nilprogression". As one consequence of this result, any subset of such a solvable group of small doubling is is controlled by a set whose iterated products grow polynomially, and which are contained inside a virtually nilpotent group. As another application we establish a strengthening of the Milnor-Wolf theorem that all solvable groups of polynomial growth are virtually nilpotent, in which only one large ball needs to be of polynomial size. This result complements recent work of Breulliard-Green, Fisher-Katz-Peng, and Sanders.

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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