请输入您要查询的字词:

 

单词 IharasTheorem
释义

Ihara’s theorem


Let Γ be a discrete, torsion-free subgroupMathworldPlanetmathPlanetmath of SL2p (where p is the field of p-adic numbers (http://planetmath.org/PAdicIntegers)). Then Γ is free.

Proof, or a sketch thereof.

There exists a p+1 regularPlanetmathPlanetmath tree X on which SL2p acts, with stabilizerMathworldPlanetmath SL2p (here, p denotes the ring of p-adic integers (http://planetmath.org/PAdicIntegers)). Since p is compact in its profinite topology, so is SL2p. Thus, SL2pΓ must be compact, discrete and torsion-free. Since compact and discrete implies finite, the only such group is trivial. Thus, Γ acts freely on X. Since groups acting freely on trees are free, Γ is free.∎

随便看

 

数学辞典收录了18232条数学词条,基本涵盖了常用数学知识及数学英语单词词组的翻译及用法,是数学学习的有利工具。

 

Copyright © 2000-2023 Newdu.com.com All Rights Reserved
更新时间:2025/5/4 18:35:09