Wey1代数中的消元法及恒等式（英）

In paper [1], Zeilberger presented an approach to special functions identities, besides providing a general mathematical framework for the proof machinery, which leads to mathematically and algorithmically challenging questions such as elimination in noncommutatire operator algebras (Weyl algebra). By the impetus of this approach, we study the elimination under the shift operators.     

消元法与带积分号的恒等式（英）

In this paper, our discussion is based on Zeilberg's basic idca[1] and use an elimination in the non-commutative Weyl algebra to get the differential operator. Thereby we can obtain the algorithm of proving identities of the form (∫∞-∞ )F(x, y)dy= a(x).     

幻方与代数恒等式

<正>幻方(本文主要介绍的是3阶幻方,即中国人首先发现的世界上第一个幻方《洛书》),有许多奇妙的特性,我国著名的科普作家谈祥柏老先生有过精彩的介绍.笔者还建议读者可以查阅[美]李学数教授编著的《数学和数学家的故事》第7册第3章,那里对3阶幻方和等     

格点偏序集的一些组合恒等式（英）

This paper is devoted to the counting of j-chains of lattice-point poset. The incidence function and two basic enumerators associated with it are introduced and evaluated. Our results contain a lot of combinatorial sums.     

胞腔代数中的Rota-Baxter代数结构（英文）

一个带有非平凡幂等元的结合代数带有自然的Rota-Baxter代数结构.本文研究胞腔代数的不同拟幂等元给出的Rota-Baxter结构间的同构关系.     

量子代数SUq（4）的多分量q相干态表示

引入SUq（4）的多分量q相干态，讨论了密度算符在这种相干态中的表示和生成元的非齐次微分实现．     

新型组合恒等式（一）

新型组合恒等式是研讨别开生面的几类组合孪生恒等式组的问题．本要主要研讨互逆类的组合孪生恒等式组，该类可分为多项式型、二项式定理型、指数函数型以及三角函数（或双曲函数）型等四型，一批成双出现的新结果。与许多著名数列（Ｆｉｂｏｎａｃｃｉ数列、Ｂｅｒｎｏｕｌｌｉ数、Ｅｕｌｅｒ数以及二项式定理系数数列等）有着密切关系．此外，本人还研讨了一类特殊行列式的性质及其应用。     

Factorizations that Involve Ramanujan＇s Function k（q） = r（q）r2（q2）

In the “lost notebook”, Ramanujan recorded infinite product expansions for

Bivariant K-Theory and the Weyl Algebra*

We introduce a new version kk^alg of bivariant K-theory that is defined on the category of all locally convex algebras. A motivating example is the Weyl algebra W, i.e. the algebra generated by two elements satisfying the Heisenberg commutation relation, with the fine locally convex topology. We determine its kk^alg-invariants using a natural extension for W. Using analogous methods the kk^alg-invariants can be determined for many other algebras of similar type. *Research supported by the Deutsche Forschungsgemeinschaft. Received: January 2004     

On the Automorphism Group of the First Weyl Algebra

Let A ₁: = 𝕜[t, ?] be the first algebra over a field 𝕜 of characteristic zero. Let Aut_𝕜(A ₁) be the automorphism group of the ring A ₁. One can associate to each right ideal I of A ₁ a subgroup of Aut_𝕜(A ₁) called the isomorphism subgroup of I. In this article, we show that each such isomorphism subgroup is equal to its normalizer. For that, we study when the isomorphism subgroup of a right ideal of A ₁ contains a given isomorphism subgroup.     

Structure of maximal commutative subalgebras of the first Weyl Algebra

A short proof is given to Dixmier's sixth problem from [9] for the first Weyl algebra which askswhether a polynomial of a generic element of the first Weyl algebra is a generic element. Anaffirmative answer to this question was given by A. Joseph [14]. In the paper we give an answer to a similar question but for an arbitrary element of the first Weyl algebra. This result is used then to clarify structure of maximal commutative subalgebras in the first Weyl algebraA ₁: for a given maximal commutative subalgebra C of the Weyl algebra A₁ (almost) all non-scalar elements of it have the sametype, more precisely, have one of the following types: (i) strongly nilpotent, (ii) weakly nilpotent, (iii) generic, (iv) generic except for a subset, K ^*a+K of elements of strongly semi-simple type where a∈C is an element of strongly semi-simple type and K^*=K/{0}, (v) generic except for a subset, K^*a+K of elements of weakly semi-simple type where a∈C is an element of weakly semi-simple type.

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Sunto Si fornisce una dimostrazione breve al sesto problema di Dixmier enunciato in [9] per la prima algebra di Weyl che chiedese un polinomio di un elemento generico della prima algebra di Weyl è un elemento generico. Una rispostaaffermativa a questo problema à stata data da A. Joseph in [14]. In questo articolo formiamo una risposta ad un quesito simile ma per un elemento arbitrario della prima algebra di Weyl. Questo risultato è usato quindi per chiarire la struttura delle sottoalgebre commutative massimali della prima algebra di WeylA ₁: per una data sottoalgebra commutativa massimale C dell'algebra di Weyl A₁ (quasi) tutti i suoi elementi non scalari hanno lo stessotipo; più precisamente, hanno uno dei seguenti tipi: (i) fortemente nilpotente, (ii) debolmente nilpotente, (iii) generico, (iv) generico eccetto che per un sottoinsieme K ^*a+K di elementi di tipo fortemente semisemplice, dove a∈C è un elemento di tipo debolmente semisemplice.

     

q-Identities for Maass waveforms

The paper applies Picard-Lefschetz theory to the distribution characters of infinite dimensional representations of semisimple Lie groups and analyzes their asymptotic behaviour at the identity.Oblatum 9-IX-1993 & 15-IV-1995The author is supported by a grant from NSERC Canada.     

Local Derivations on the Weyl Algebra with one Pair of Generators

We show that on the Weyl algebra with one pair of generators every local derivation is a derivation.     

The Extension Group of the Simple Modules Over the First Weyl Algebra

The aim of this paper is to prove that for certain generalizedWeyl algebras A (including the first Weyl algebra A₁ over afield of characteristic zero) and for every simple left (right)A-module M, there are infinitely many non-isomorphic simpleleft (right) A-modules {N_i} such that (respectively ). 1991 Mathematics Subject Classification 18G15, 16G.