Special代数S(3,1)的不可约模

该文通过确定生成既约包络代数的极小左理想的极大权向量来确定不可约模,给出了特征p=2上的Special代数S(3,1)的特征标x的高度≤0的不可约模同构类的代表元以及它们的维数.     

完备化Witt代数的最高权表示

本文讨论了完备化Witt李代数Verma模的不可约性,并利用其子代数给出了Virasoro代数的两类不可约非权模的实现,得到了一些有趣的组合恒等式.     

Contact代数K(m,n)的不可约模的结构

利用广义限制李代数的概念和性质,研究Contact代数K(m,n)的不可约表示,给出了特征标高度大于等于2且小于P-3的不可约K(m,n)-模的结构.     

Contact代数K(m,n)的不可约模的结构

利用广义限制李代数的概念和性质,研究Contact代数K(m,n)的不可约表示,给出了特征标高度大于等于2且小于p-3的不可约K(m,n)-模的结构.     

非交换群上一类代数的不可约表示

在一类无限维非交换Hopf代数上,借助其Hopf理想,构造出商Hopf代数,讨论了此商代数上的有限维不可约模,得出此非平凡不可约模的维数一定是2.     

阶化Cartan型李代数的上同调

本文利用广义限制李代数的概念和应用Frobenius代数的一些性质来研究广义限制李代数的广义限制完备上同调,并利用广义限制上同调与通常上同调的关系尝试着给出一种计算系数为不可约模的阶化Cartan型李代数上同调的方法.     

阶化Cartan型李代数的上同调

本文利用广义限制李代数的概念和应用Frobenius代数的一些性质来研究广义限制李代数的广义限制完备上同调,并利用广义限制上同调与通常上同调的关系尝试着给出一种计算系数为不可约模的阶化Cartan型李代数上同调的方法.     

仿射李代数上基本模的极大权

设g(A)是结合于仿射型广义Cartan矩阵A的Kac-Moody代数,L(Λ)(Λ∈P )是g(A)上可积不可约的最高权模。文献[1]证明了L(Λ)的支配极大权只有有限个,并且决定了A~((k))_l,D~((k))_l,E~((k))_l(k=1,2,3)型Kac-Moody代数上水平1的可积不可约模L(Λ)的极大权集及权系。本文试图用不同于[1]的方法,也是更直接的方法,来决定C~((1))_2,G~((1))_2型Kac-Moody代数上基本不可约模L(Λ)的极大权集和权系。 本文所使用的术语和记号均见文献[1]。     

软可换BCI-代数

将软集合理论应用到可换BCI-代数中,给出了软可换BCI-代数的概念,讨论了软可换BCI-代数和软BCI-代数之间的关系,研究了软可换BCI-代数的扩展交、限制交、限制并以及限制差分等性质.最后,研究了软可换BCI-代数的同态性质.     

R_0-代数的Stone拓扑表示定理

研究R0-代数中极大滤子的结构性质,通过引入有限平方交性质的概念证明了素理想定理;在全体极大滤子之集上引入了Stone拓扑,研究了Stone空间的性质;在R0-代数中引入了Boole-元的概念,证明了R0-代数的Stone拓扑表示定理,即,全体Boole-元作为Boole代数同构于该R0-代数的Stone空间中的全体既开又闭子集构成的Boole代数。Boole代数的Stone拓扑表示定理可作为该表示定理的特例而给出。     

Composition of matrix products and categorical equivalence

First, we prove two finite algebras are categorically equivalent if and only if the matrix products of their irredundant non-refinable covers are isomorphic. Second, we characterize families of irreducible algebras such that there exists an algebra whose neighbourhoods in an irredundant non-refinable cover are isomorphic to the respective irreducible algebra in the given family. Finally, we exhibit two facts by constructing examples. The first one is that there is a family of irreducible algebras such that there are many algebraic structures whose neighbourhoods in an irredundant non-refinable cover are isomorphic to the respective irreducible algebra in the given family. The second example is an algebra such that the matrix product of an irredundant non-refinable cover is bigger than the given algebra.     

A fundamental representation of quantum generalized Kac-Moody algebras with one imaginary simple root

We consider the Borcherds-Cartan matrix obtained from a symmetrizable generalized Cartan matrix by adding one imaginary simple root. We extend the result of Gebert and Teschner [Lett. Math. Phys., 1994, 31: 327-334] to the quantum case. Moreover, we give a connection between the irreducible dominant representations of quantum Kac-Moody algebras and those of quantum generalized Kac-Moody algebras. As the result, a large class of irreducible dominant representations of quantum generalized Kac-Moody algebras were obtained from representations of quantum Kac-Moody algebras through tensor algebras.     

A contribution to Segal algebras

Let A and B be Banach algebras. If B is an abstract Segal algebra in A, we have a bijective correspondence between the strictly irreducible representations of A and those of B. This gives a bijective correspondence for maximal modular left ideals. If A and B have approximate right units, we obtain a bijective correspondence for right resp. Two-sided ideals. For two-sided ideals this correspondence preserves the property of an ideal having approximate right units. This generalizes a Theorem by H. Reiter.It would be sufficient to require B to be a Banachspace.     

Maximal Jordan algebras of matrices with bounded number of eigenvalues

We consider maximal Jordan algebras of matrices with bounded number of eigenvalues. Up to simultaneous similarity we list all irreducible algebras of that kind, and we also give a list of some reducible such algebras. We also study automorphisms of Jordan algebras of matrices. Research supported in part by the NSERC of Canada and by the Ministry of Science and Technology of Slovenia.     

非负不可约矩阵的广义Perron补矩阵

1989年Meyor为计算马尔可夫链的平稳分布向量构造了一个算法，首次提出非负不可约矩阵的Perron补矩阵的概念，本给出非负不可约矩阵A的广义Perron补矩阵若干性质，并且证明若矩阵A是不可约逆M-矩阵，其广义Perron补矩阵也是不可约逆M-矩阵。     

关于非负不可约矩阵的广义Perron补的一些性质

1989年Meyer为计算马尔可夫链的平稳分布向量构造了一个算法，首次提出非负不可约矩阵的Perron补的概念。本文给出非负不可约矩阵A的广义Perron补若干性质，并且证明当矩阵A是不可约逆M-矩阵，其广义Perron补也是不可约逆M-矩阵。     

Realizing ultragraph Leavitt path algebras as Steinberg algebras

In this article, we realize the finite range ultragraph Leavitt path algebras as Steinberg algebras. This realization allows us to use the groupoid approach to obtain structural results about these algebras. Using the skew product of groupoids, we show that ultragraph Leavitt path algebras are graded von Neumann regular rings. We characterize strongly graded ultragraph Leavitt path algebras and show that every ultragraph Leavitt path algebra is semiprimitive. Moreover, we characterize irreducible representations of ultragraph Leavitt path algebras. We also show that ultragraph Leavitt path algebras can be realized as Cuntz-Pimsner rings.     

Sur les zéros des fonctions L automorphes

We extend part of Cannes' work on the Riemann hypothesis to zeta functions of simple algebras. To any irreducible cuspidal automorphic representation of the units in such an algebra we attach, in a natural way, an operator the spectrum of which consists of the critical zeros of its L-function.     

关于逆N0-矩阵的若干性质

1989年Meyer为计算马尔可夫链的平稳分布向量构造了一个算法,首次提出非负不可约矩阵的Perron补的概念.在非负不可约矩阵的广义Perron补若干性质的基础上,给出逆N0-矩阵的几个性质.     

The irreducible characters of the alternating Hecke algebras

This paper computes the irreducible characters of the alternating Hecke algebras, which are deformations of the group algebras of the alternating groups. More precisely, we compute the values of the irreducible characters of the semisimple alternating Hecke algebras on a set of elements indexed by minimal length conjugacy class representatives and we show that these character values determine the irreducible characters completely. As an application, we determine a splitting field for the alternating Hecke algebras in the semisimple case.