李三系的中心扩张

李三系是从黎曼对称空间产生的三元运算的代数系统,近年来备受数学家们的重视.对李三系的中心扩张问题进行了研究,提出了Heisenberg李三系的概念,并对任意线性空间给出了构造Heisenberg李三系的一种方法.     

具有高阶导子3-李代数的扩张与形变

本文中, 我们称3-李代数与高阶导子为3-LieHDer对, 我们定义系数在表示中3-LieHDer对的上同调, 其次, 我们研究3-LieHDer对的阿贝尔扩张,并将其与3-LieHDer对的第二上同调群联系起来.最后,我们考虑由自系数上同调控制的3-LieHDer对的形式形变.     

具有导子的Lie-Yamaguti代数

本文研究具有导子的Lie-Yamaguti代数,称之为LieYDer对.首先给出LieYDer对的上同调.其次,研究LieYDer对的中心扩张.最后,根据其上同调考虑LieYDer对的形变.     

关于相容Hom-李三系

本文考虑了相容Hom-李三系.具体地,相容Hom-李三系被刻画为双微分分次李代数的Maurer-Cartan元.随后,定义了相容Hom-李三系的上同调理论.作为上同调的应用,研究了相容Hom-李三系的线性形变和阿贝尔扩张.     

李三系的Frattini子系

李三系是从黎曼对称空间产生的三元运算的代数系统,近年来备受数学家们的重视.针对李三系的Frattini子系和基本李三系的问题进行了研究,给出了Frattini子系和基本李三系的一些性质,并证明了李三系的非嵌入定理,同时得到了幂零李三系是基本李三系的一个充要条件.     

限制李三系的Frattinip-子系

主要把群的Frattini理论发展到限制李三系,得到限制李三系的Frattini-子系、Frattini p-子系的性质,给出Frattini p-子系为零时限制李三系的分解.     

限制李三系的半单元

研究了限制李三系的半单元的一些重要性质,给出了若干个限制李三系是可换的条件,得到了限制李三系的有环面元基的几个条件,刻划了限制李三系的Frattini p-子系的一些性质.同时,研究了中心为零的所有元素是半单元的限制李三系的一些重要性质.     

可度量化李三系

研究域K上可定义非退化不变对称双线性形的李三系■(称这样的李三系■为可度量化的).对一个李三系■,我们定义了该李三系的T_ω~*-扩张,给出了一个度量化李三系(■,φ)同构于某李三系的T~*-扩张的充分必要条件,并且讨论了什么时候两个T~*-扩张是等价或度量等价的.最后证明当基域的特征为零时,偶数维幂零的度量化李三系与某李三系的T~*-扩张同构,而奇数维幂零的度量化李三系则同构于某李三系的T~*-扩张的余维数为1的非退化理想.     

δJordan-李三系上带有权λ的k-阶广义导子

本文研究了δJordan-李三系上带有权λ的k-阶广义导子的相关问题.通过计算,得到了每一个δJordan-李三系上带有权λ的k-阶Jordan三角θ-导子都是一个带有权λ的k-阶θ-导子.在定义下,给出了带有权λ的k-阶Jordan三角θ-导子的另一种等价形式.同时,建立了带有权λ的k-阶广义(θ,ϕ)-导子和Rota-BaxterδJordan-李三系上带有权λ的Rota-Baxter算子的遗传性质,得到了每一个Rota-BaxterδJordan-李代数能看成一个Rota-BaxterδJordan-李三系的结论.     

量子环面李代数的自同构群, 泛中心扩张与导子

C_q:=C_q[x^±1₁, x^±1₂] 为复数域上的量子环面, 其中q≠ 0是一个非单位根, D(C_q) 为C_q的导子李代数. 记L_q 为C_q ㈩ D(C_q)的导出子代数. 该文研究李代数L_q的自同构群, 泛中心扩张和导子李代数.     

Cohomologies of Leibniz Algebras with Higher Derivations北大核心CSCD

本文研究具有高阶导子的莱布尼兹代数.我们称之为LeibHDer对.首先给出LeibHDer对的表示并构造半直积.最后,定义LeibHDer对的上同调并研究其中心扩张和形变理论.     

Central extensions and deformations of Hom-Lie triple systems

In this paper, we study the cohomology theory of Hom-Lie triple systems generalizing the Yamaguti cohomology theory of Lie triple systems. We introduce the central extension theory for Hom-Lie triple systems and show that there is a one-to-one correspondence between equivalent classes of central extensions of Hom-Lie triple systems and the third cohomology group. We develop the 1-parameter formal deformation theory of Hom-Lie triple systems and prove that it is governed by the cohomology group.     

Structure of Degenerate Block Algebras

Given a non-trivial torsion-free abelian group (A,+,Q), a field F of characteristic 0, and a non-degenerate bi-additive skew-symmetric map : A A F, we define a Lie algebra = (A, ) over F with basis {e_x | x A/{0}} and Lie product [e_x,e_y] = (x,y)e_x+y. We show that is endowed uniquely with a non-degenerate symmetric invariant bilinear form and the derivation algebra Der of is a complete Lie algebra. We describe the double extension D(, T) of by T, where T is spanned by the locally finite derivations of , and determine the second cohomology group H²(D(, T),F) using anti-derivations related to the form on D(, T). Finally, we compute the second Leibniz cohomology groups HL²(, F) and HL²(D(, T), F).2000 Mathematics Subject Classification: 17B05, 17B30This work was supported by the NNSF of China (19971044), the Doctoral Programme Foundation of Institution of Higher Education (97005511), and the Foundation of Jiangsu Educational Committee.     

Nonlinear generalized Lie triple derivation on triangular algebras

Let ? be a commutative ring with identity and let 𝔄 = Tri(𝒜,?,?) be a triangular algebra consisting of unital algebras 𝒜,? over ? and an (𝒜,?)-bimodule ? which is faithful as a left 𝒜-module as well as a right ?-module. In this paper, we prove that under certain assumptions every nonlinear generalized Lie triple derivation G_L:𝔄→𝔄 is of the form G_L = δ+τ, where δ:𝔄→𝔄 is an additive generalized derivation on 𝔄 and τ is a mapping from 𝔄 into its center which annihilates all Lie triple products [[x,y],z].     

Universal Central Extensions of Lie Groups

We call a central Z-extension of a group G weakly universal for an Abelian group A if the correspondence assigning to a homomorphism ZA the corresponding A-extension yields a bijection of extension classes. The main problem discussed in this paper is the existence of central Lie group extensions of a connected Lie group G which is weakly universal for all Abelian Lie groups whose identity components are quotients of vector spaces by discrete subgroups. We call these Abelian groups regular. In the first part of the paper we deal with the corresponding question in the context of topological, Fréchet, and Banach–Lie algebras, and in the second part we turn to the groups. Here we start with a discussion of the weak universality for discrete Abelian groups and then turn to regular Lie groups A. The main results are a Recognition and a Characterization Theorem for weakly universal central extensions.     

算子代数上2-局部Lie三重导子的结构

设X是维数大于2的Banach空间,映射δ:B(X)→B(X)是2-局部Lie三重导子,则对所有A∈B(X)有δ(A)=[A,T]+ψ(A),这里T∈B(X),ψ是从B(X)到FI的齐次映射且满足对所有A,B∈B(X)有ψ(A+B)=ψ(A),其中B是交换子的和.     

李共形代数与导子的上同调

本文研究具有导子的李共形代数.李共形代数与导子被称为LieCDer对.我们引入LieCDer对的上同调.此外,作为上同调应用,我们研究LieCDer对的阿贝尔扩展.最后,我们考虑2项共形$L_{infty}$-代数上的同伦导子与共形李2-代数上的2-导子。2项共形$L_{infty}$ - 代数与同伦导子的范畴与共形李2代数与2-导子的范畴是等价的.     

THE BANACH-LIE GROUP OF LIE TRIPLE AUTOMORPHISMS OF AN H^＊-ALGEBRA^＊

We study the Banach-Lie group Ltaut(A) of Lie triple automorphisms of a complex associative H*-algebra A. Some consequences about its Lie algebra, the algebra of Lie triple derivations of A, Ltder(A), are obtained. For a topologically simple A, in the infinite-dimensional case we have Ltaut(A)0 = Aut(A) implying Ltder(A) = Der(A). In the finite-dimensional case Ltaut(A)0 is a direct product of Aut(A) and a certain subgroup of Lie derivations δ from A to its center, annihilating commutators.     

扭的Multi-loop代数的triple导子

设G是三维实李代数so(3)的复化李代数,A=C[T_1~(±1),t_2~(±2)]为复数域上的多项式环.设L(t_1,t_2,1)=G(?)_cA,d_1,d_2为L(t_1,t_2,1)的度导子.最近我们研究了李代数L(t_1,t_2,1)的自同构群结构.研究扭的Multi-loop代数L(t_1,t_2,1)(?)(Cd_1(?)Cd_2)的导子以及triple导子结构.