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arXiv 0910.4148math.GRmath.MG
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Gromov多项式增长定理的有限形式

A finitary version of Gromov's polynomial growth theorem

Yehuda Shalom, Terence Tao

摘要:

我们证明了,对于一些绝对(显式)常数$C$,以下情况适用于有限生成群$G$,和所有的$d >0$:如果有一些$ R_0 > \exp(\exp(Cd^C))$,其中的元素的数量在一个球的半径$R_0$在一个Cayley图的$G$是有界的$R_0^d$,那么$G$有一个有限的指数子群是幂零的(步骤$<C^d$)。如果用“多环”代替“幂零”,则给出了有限指数的一个有效界,从而对有限群也给出了一个非平凡的结果。

英文摘要:

We show that for some absolute (explicit) constant $C$, the following holds for every finitely generated group $G$, and all $d >0$: If there is some $ R_0 > \exp(\exp(Cd^C))$ for which the number of elements in a ball of radius $R_0$ in a Cayley graph of $G$ is bounded by $R_0^d$, then $G$ has a finite index subgroup which is nilpotent (of step $<C^d$). An effective bound on the finite index is provided if "nilpotent" is replaced by 'polycyclic", thus yielding a non-trivial result for finite groups as well.

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