非阶化Virasoro代数和Virasoro超代数及其中间序列模

介绍非阶化Virasoro(超)代数的概念,给出非阶化Virasoro(超)代数的中间序列模,并对非阶化Virasoro代数的子代数(秩为1的非阶化Witt代数)的中间序列模进行分类．     

Virasoro李代数的子代数若干结果

无中心的Virasoro代数最早出现于1909年,由Cartan定义,本文创造性地利用“系数”矩阵,证明了无中心的Virasoro代数没有交换的二维子代数,并找出一系列区别于Cd0+Cdi的平凡二维非交换子代数,并讨论二维子代数相关一些性质．     

Virasoro李代数的子代数间的同构及生成元

证明了无中心Virasoro李代数的有限维子代数同构的充分必要条件,证明了两个元素di,dj作为生成元的充分必要条件,找出了几组互相同构的无限维真子代数,研究了他们的极大性,单性以及其它性质.     

Lie超代数及二次Lie超代数的分解惟一性

一个带有非退化超对称不变双线性型的Lie超代数称为二次Lie超代数. 考虑Lie超代数的分解, 得到在同构意义下一个Lie超代数分解为不可分解阶化理想直和的方式惟一及在保距同构意义下一个二次Lie超代数分解为不可约非退化阶化理想直和的方式惟一.     

一类W-代数的导子和自同构

讨论了一类W-代数,这类李代数包含无中心的广义Virasoro子代数.本文确定了这类李代数的导子和自同构.     

一类只有两个不同非零交换理想的无限维李代数

构造了一类无限维李代数,它是无中心的Virasoro李代数的推广,且只有两个不同的非零交换的理想.还研究了这类李代数的理想、中心和子代数.     

带双参数的a,b无限维李代数W(a,b)的性质

研究了带双参数的a,b的无限维W(a,b)型李代数,这类李代数是Virasoro李代数的推广.本文研究了这类李代数的两类子代数,一类子代数同构无中心的Virasoro李代数,另一类子代数是交换李子代数,并且是理想.研究了这类李代数同构和同态,证明了g不是单李代数.     

中心单Poisson代数

确定了特征0的代数闭域上与局部有限导子相关的中心单Poisson代数的结构. 这些Poisson代数的Lie代数结构一般来说不是有限阶化的.     

Loop与current Virasoro型Lie双代数的对偶

Loop与current Virasoro型Lie代数分别是Virasoro代数与多项式代数和Laurent多项式代数的张量Lie代数.本文给出了loop型与current Virasoro型Lie双代数的对偶Lie双代数结构.由此得到了一系列无限维Lie代数.     

广义Weyl超代数的导子

本文研究一类非阶化非线性李超代数的导子，利用阶化方法研究非阶化问题，确定了一类weyi型结合及李超代数的导子代数．在一般情况下并非所有的导子都是内导子．     

Super-biderivations of Lie superalgebras

In this paper, we attempt to investigate the super-biderivations of Lie superalgebras. Furthermore, we prove that all super-biderivations on the centerless super-Virasoro algebras are inner super-biderivations. Finally, we study the linear super commuting maps on the centerless super-Virasoro algebras.     

Super-biderivations of not-finitely graded Lie superalgebras related to generalized super-Virasoro algebras

We mainly study the super-biderivations of not-finitely graded Lie superalgebras related to generalized super-Virasoro algebras. In particular, we prove that all super-biderivations of not-finitely graded Lie superalgebras related to generalized super-Virasoro algebras are inner.     

Drinfel'd Twist Deformations of the Super-Virasoro Algebras

In this article, we describe nonstandard quantum deformations of the centerless super-Virasoro algebras. Using the Drinfel'd twist quantization technique, we obtain the deformed coproduct and antipode. Hence we get a family of noncommutative and noncocommutative Hopf superalgebras. As a by-product, we also obtain two combinational identities.     

Left-symmetric superalgebra structures on the N = 2 superconformal algebras

The super-Virasoro algebras, also known as the superconformal algebras, are nontrivial graded extensions of the Virasoro algebra to Lie superalgebra version. In this paper, we classify the compatible left-symmetric superalgebra structures on the N = 2 Ramond and Neveu–Schwarz superconformal algebras under certain conditions, which generalizes the corresponding results for the Witt, Virasoro and super Virasoro algebras.     

Classification of harish-chandra modules over the super-virasoro algebras

In this paper, we first construct all indecomposable modules whose dimensions of weight spaces of the even and odd parts are ≤ 1, then classify all Harish-Chandra module over the super-Virasoro algebras, proving that every Harish-Chandra module over the super-Virasoro algebras is either a highest or lowest weight module, or else a module of the intermediate series. This result generalizes a theorem which was originally given as a conjecture by Kac on the Virasoro algebra.     

Structures of Generalized Loop Virasoro Algebras

In this article, we study the structure theory of a class of generalized loop Virasoro algebras. In particular, the derivation algebras, the automorphism groups, and the second cohomology groups of generalized loop centerless Virasoro algebras are determined.     

Dual Lie Bialgebra Structures of W -algebra W (2, 2) Type

In the present paper, we investigate the dual Lie coalgebras of the centerless W(2, 2) algebra by studying the maximal good subspaces. Based on this, we construct the dual Lie bialgebra structures of the centerless W(2, 2) Lie bialgebra. As by-products, four new infinite dimensional Lie algebras are obtained.     

Absolute retracts and essential extensions in congruence modular varieties

This paper studies absolute retracts in congruence modular varieties of universal algebras. It is shown that every absolute retract with finite dimensional congruence lattice is a product of subdirectly irreducible algebras. Further, every absolute retract in a residually small variety is the product of an abelian algebra and a centerless algebra.     

LIE SUPER-BIALGEBRA STRUCTURES ON GENERALIZED SUPER-VIRASORO ALGEBRAS

In this article,Lie super-bialgebra structures on generalized super-Virasoro algebras L are considered.It is proved that all such Lie super-bialgebras are coboundary triangular Lie super-bialgebras if and only if H1(L,LL)=0.