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{{DISPLAYTITLE:Pro-''p'' group}} | |||
In [[mathematics]], a '''pro-''p'' group''' (for some [[prime number]] ''p'') is a [[profinite group]] <math>G</math> such that for any [[open set|open]] [[normal subgroup]] <math>N\triangleleft G</math> the [[quotient group]] <math>G/N</math> is a [[p-group|''p''-group]]. Note that, as profinite groups are [[compact space|compact]], the open subgroups are exactly the [[closed set|closed]] subgroups of finite [[index of a subgroup|index]], so that the [[discrete space|discrete]] quotient group is always finite. | |||
Alternatively, one can define a pro-''p'' group to be the [[inverse limit]] of an [[inverse system]] of discrete finite ''p''-groups. | |||
The best-understood (and historically most important) class of pro-''p'' groups is the [[p-adic number|''p''-adic]] analytic groups: groups with the structure of an analytic [[manifold]] over <math>\mathbb{Q}_p</math> such that group multiplication and inversion are both analytic functions. | |||
The work of [[Alexander Lubotzky|Lubotzky]] and Mann, combined with [[Michel Lazard]]'s solution to [[Hilbert's fifth problem]] over the ''p''-adic numbers, shows that a pro-''p'' group is ''p''-adic analytic if and only if it has finite [[Prüfer rank|rank]], i.e. there exists a positive integer <math>r</math> such that any closed subgroup has a topological generating set with no more than <math>r</math> elements. | |||
==Examples== | |||
* The canonical example is the [[p-adic number|''p''-adic integers]] | |||
:: <math>\mathbb{Z}_{p} = \displaystyle \lim_{\leftarrow} \mathbb{Z}/p^n\mathbb{Z}. </math> | |||
* The group <math>\ GL_{n}( \mathbb{Z}_{p}) </math> of invertible ''n'' by ''n'' [[matrix (mathematics)|matrices]] over <math>\ \mathbb{Z}_{p} </math> has an open subgroup ''U'' consisting of all matrices congruent to the [[identity matrix]] modulo <math>\ p\mathbb{Z}_{p} </math>. This ''U'' is a pro-''p'' group. In fact the ''p''-adic analytic groups mentioned above can all be found as closed subgroups of <math>\ GL_{n}( \mathbb{Z}_{p}) </math> for some integer ''n'', | |||
* Any finite [[p-group|''p''-group]] is also a pro-''p''-group (with respect to the constant inverse system). | |||
==See also== | |||
* [[Residual property (mathematics)]] | |||
==References== | |||
* {{citation | id={{MathSciNet | id=1152800}} | last1=Dixon | first1=J. D. | last2=du Sautoy | first2=M. P. F. | last3=Mann | first3=A. | last4=Segal | first4=D. | title=Analytic pro-p-groups | publisher=[[Cambridge University Press]] | year=1991 | ISBN=0-521-39580-1 | author2-link=Marcus du Sautoy}} | |||
[[Category:Infinite group theory]] | |||
[[Category:Topological groups]] | |||
[[Category:P-groups]]<!-- Properly, a generalization, but useful to have in the category because closely related. --> | |||
{{algebra-stub}} |
Revision as of 05:15, 10 December 2013
In mathematics, a pro-p group (for some prime number p) is a profinite group such that for any open normal subgroup the quotient group is a p-group. Note that, as profinite groups are compact, the open subgroups are exactly the closed subgroups of finite index, so that the discrete quotient group is always finite.
Alternatively, one can define a pro-p group to be the inverse limit of an inverse system of discrete finite p-groups.
The best-understood (and historically most important) class of pro-p groups is the p-adic analytic groups: groups with the structure of an analytic manifold over such that group multiplication and inversion are both analytic functions. The work of Lubotzky and Mann, combined with Michel Lazard's solution to Hilbert's fifth problem over the p-adic numbers, shows that a pro-p group is p-adic analytic if and only if it has finite rank, i.e. there exists a positive integer such that any closed subgroup has a topological generating set with no more than elements.
Examples
- The canonical example is the p-adic integers
- The group of invertible n by n matrices over has an open subgroup U consisting of all matrices congruent to the identity matrix modulo . This U is a pro-p group. In fact the p-adic analytic groups mentioned above can all be found as closed subgroups of for some integer n,
- Any finite p-group is also a pro-p-group (with respect to the constant inverse system).
See also
References
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