A#H^＊rat为中心单代数的条件

本文用ＭｏｒｉｔａＣｏｎｔｅｘｔ的方法得到域上余ＦｒｏｂｅｎｉｕｓＨｏｐｆ代数Ｈ与Ｈ－余摸代数Ａ的Ｓｍａｓｈ积Ａ＃Ｈ＊ｒａｔ是中心单代数的条件：若Ａ／ＡＣｏＨ是Ｈ－Ｇａｌｏｉｓ扩张，且ＡＣｏＨ是中心单代数，则Ａ＃Ｈ＊ｒａｔ也是中心单代数，特别地，若ＡＣｏＨｋ，则Ａ＃Ｈ＊ｒａｔ是中心单代数，且为ｋ－空间Ａ上线性变换稠密环．作为推论给出Ｈ＃Ｈ＊ｒａｔ是本原中心单代数新的证明．     

Congruences and Ideals of Effect Algebras

This paper is devoted to a general investigation of congruences and ideals in effect algebras. One of our main results is the existence of an order isomorphism between Riesz congruences and Riesz ideals. We also answer an open question of Dvureenskij and Pulmannová by showing that an ideal is a Riesz ideal if and only if it is closed under generalized Sasaki projections.     

The algebraic classification of nilpotent Tortkara algebras

Abstract

We classify all complex 6-dimensional nilpotent Tortkara algebras.

Communicated by Alberto Facchini     

Traces on infinite-dimensional brauer algebras

We prove a theorem describing central measures for random walks on graded graphs. Using this theorem, we obtain the list of all finite traces on three infinite-dimensional algebras, namely, on the Brauer algebra, the walled Brauer algebra, and the partition algebra. The main result is that these lists coincide with the list of traces of the symmetric group or (for the walled Brauer algebra) of the square of the symmetric group.     

Interval topology on effect algebras

In this paper, we study the interval topology on effect algebras, and prove that effect algebra operation on Hilbert space effect algebra E(H) is not jointly continuous under the interval topology.     

Two properties of sequence of vector measures on effect algebras

Let (L,⊕,0,1) be an effect algebra and let X be a Banach space. A function μ : L → X is called a vector measure if μ(a ⊕ b) = μ(a) + μ(b) whenever a⊥b in L. The function μ is said to be s-bounded if lim n→∞μ(a n ) = 0 in X for any orthogonal sequence (a n ) n∈N in L. In this paper, we introduce two properties of sequence of s-bounded vector measures and give some results on these properties.     

关于赵君喜“R_n~∞中一个幂等元的构造”一文的意见

本文证明了“中一个幂等元的构造”一文中的幂等元Ｑ不是套代数ａｌｇＮ中的算子,因此也不是如该文作者所断言的是中的元。     

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.     

The classification of n-dimensional anticommutative algebras with (n − 3)-dimensional annihilator

We give the classification of all n-dimensional anticommutative complex algebras with (n???3)-dimensional annihilator. Namely, we describe all central extensions of all 3-dimensional anticommutative complex algebras.     

一类量子环面李代数的泛中心扩张

设Cq=Cq[x1^±1,x2^1]为复数域上的量子环面,其中q≠0是一个非单位根．D（Cq）为Cq的导子李代数．记Lq为Cq＋D（Cq）的导出子代数．本文研究李代数Lq的泛中心扩张．     

THE SERRE RELATIONS IN RINGEL－HALL ALGEBRAS

The author constructs the Casimir element of Hall algebras.By the method of Gabber-Kactheorem(see [4]),it is proved that the Serre relations are the defining relations in compositionalgebra.     

Remarks on Nonassociative Structures in Quantum Projective Field Theory: the Central Extension jl(2,C) of the Double sl(2,C)+sl(2,C) of the Simple Lie Algebra sl(2,C) and Related Topics

This paper is a revised and expanded version of two notes devoted to nonassociative structures in quantum projective field theory.     

THE SERRE RELATIONS IN RINGEL-HALL ALGEBRAS ABDUKADER OBUL

The author constructs the Casimir element of Hall algebras.By the method of Gabber-Kac theorem (see [4]),it is proved that the Serre relations are the defining relations in composition algebra.     

Ideals and congruences in effect algebras and qmv-algebras

Ideals and sets of ideals of different types on QMV-algebras and the corresponding effect algebras are studied and compared.     

Some Properties On Isoclinism in n-Lie Algebras

The concept of n-Lie algebra were introduced by Filippov in 1987. One notes that not all properties of Lie algebras can be carried over to n-Lie algebras, as Williams showed in 2009. In the present article, among other results it is shown that the notions of isoclinism and isomorphism for two finite dimensional n-Lie algebras of the same dimension are equivalent. This was already done for ordinary Lie algebras by Moneyhun in 1994.     

中心分次单代数

设M是交换Monoid，G是交换群，D是M-分次域．本文的结果是：(一)证明D上两个有有限分次维数的中心M-分次单代数之分次张量积仍是此类分次代数．(二)给出D上G-分次代数的Noether—Skolem型定理．