TWISTED CONJUGACY CLASSES IN LATTICES IN SEMISIMPLE LIE GROUPS

Given a group automorphism ?: Γ?→?Γ, one has an action of Γ on itself by ?-twisted conjugacy, namely, g.x?=?gx?(g ^?1). The orbits of this action are called ?-conjugacy classes. One says that Γ has the R∞-property if there are infinitely many ?-conjugacy classes for every automorphism ? of Γ. In this paper we show that any irreducible lattice in a connected semisimple Lie group having finite centre and rank at least 2 has the R∞-property.     

半单李代数的一个特征性质

本文给出了中心为零的带非退化对称不变双线性型的有限维李代数的若干性质,并由此给出了半单李代数的一个新刻划。     

LAX OPERATOR ALGEBRAS AND GRADINGS ON SEMI-SIMPLE LIE ALGEBRAS

A Lax operator algebra is constructed for an arbitrary semi-simple Lie algebra over ? equipped with a ?-grading, and arbitrary compact Riemann surface with marked points. In this set-up, a treatment of almost graded structures, and classification of the central extensions of Lax operator algebras are given. A relation to the earlier approach based on the Tyurin parameters is established.     

李群的解析对合自同构对的分类

本文给出复单李代数的对合自同构对的分类,并利用它研究单连通,单李群的解析对合自同构对的分类.     

李群的解析对合自同构对的分类

本文给出复单李代数的对合自同构对的分类,并利用它研究单连通,单李群的解析对合自同构对的分类.     

SEMISIMPLE BANACH ALGEBRAS GENERATED BY STRONGLY CONTINUOUS REPRESENTATIONS OF MOORE GROUPS

We prove that if is a strongly continuous bounded representationof a Moore group G on a Banach space X, and if the Arveson spectrumof is scattered, then the closure with respect to the weakoperator topology in L(X) of the algebra generated by the transforms _Gf(t) (t)d t with f L¹(G) is a semisimple Banach algebra.     

LIE GROUPS ADMITTED BY AUTONOMOUS SYSTEM WITH GIVEN STRUCTURE CONSTANTS

1IlltroductionandNotationsInthesecondhalfofthepreviouscentury,SophousLieintroducedthetheoryofLiegroups,inordertocreateatheoryofintegratingordinarydifferentialequations.Sofar,Liegrouptheoryhadplayedimportantimpactinintegrabilitytheoryofdifferentialequations(ref.[l,2,3]).Considerthefollowingfirstorderautonomoussystemofnordinarydifferentialequations'wherex=(x',x',''3x)ED,andDisasub-domainofR(orC),XifD-- R(orC),XfECoo(D),andtER(orC).Astheclassicalresult,theorderofthesystemcanbereduced…     

ORTHOGONAL DECOMPOSITIONS AND IDEMPOTENT CONFIGURATIONS IN SEMISIMPLE ASSOCIATIVE ALGEBRAS

This is an introductory survey on the theories of orthogonal decompositions of associative algebras, balanced systems of idempotents, H-bijections of groups and H _R -isomorphisms of group rings. These new theories have grown up from the investigations of orthogonal decompositions of simple Lie algebras into a sum of Cartan subalgebras carried out by A. I. Kostrikin with collaborators.     

判定常微分方程组具有一维李对称群的新方法

给出了判定常微分方程组接受一维李对称群的一种新方法，利用该方法证明了无穷小生成元的一个性质，所给方法比传统方法形式简单。     

RESTRICTIONS OF LARGE IRREDUCIBLE REPRESENTATIONS OF THE CLASSICAL GROUPS TO NATURALLY EMBEDDED SMALL SUBGROUPS CANNOT BE SEMISIMPLE

It is proved that the restriction of a p-restricted representation of a classical algebraic group G of rank r in characteristic p > 0 to a naturally embedded semisimple subgroup cannot be completely reducible (semisimple) if the subgroup has a simple component of rank m small enough with respect to r and the highest weight is large enough with respect to p. It suffices to assume that r ≥ 2m and that the highest weight is equal to ∑ ^r _i=1 a_i ω _i with ∑ ^r _i=1 a_i ≥ 2p ? 1 if p ≠ 2 or G ≠ C_r (K) and ∑ ^r _i=1 a_i ≥ 4 for p = 2 and G = C_r (K).     

DEGENERATION OF SEMISIMPLE ALGEBRAS

Some observations and conjectures concerning finite dimensional associative commutative algebras that are degenerations of semisimple algebras.

“…on sait qu'on ne sait rien sur cette sorte d'algèbre.” André Weil     

局部环上辛群在线性群中的扩群

本文完全定出了局部环上辛群在一般线性群中的扩群.     

局部环上辛群在线性群中的扩群

本文完全定出了局部环上辛群在一般线性群中的扩群.     

SUBGROUP DISTORTIONS IN NILPOTENT GROUPS

The explicit formula for the distortion function of a connected Lie subgroup in a connected simply connected nilpotent Lie group is obtained. In particular, we prove that a function f: N → R can be realized (up to equivalence) as the distortion function of a connected Lie subgroup in a connected simply connected nilpotent Lie group if and only if f ～ n^r for some nonnegative r ∈ Q. Considering lattices in Lie groups, we establish the analogous results for finitely generated nilpotent groups.     

关于MH中的Lie双代数和余Poisson-Hopf代数

本文研究余三角Ｈｏｐｆ代数余模范畴中的Ｌｉｅ双代数和余ＰｏｉｓｓｏｎＨｏｐｆ代数,我们主要讨论余三角Ｈｏｐｆ代数余模范畴中的Ｌｉｅ双代数和余Ｐｏｉｓｓｏｎ－Ｈｏｐｆ代数之间的关系。