A subalgebra of loop algebra A2^～ and its applications

A subalgebra of loop algebra A2^～ and its expanding loop algebra G^- are constructed. It follows that both resulting integrable Hamiltonian hierarchies are obtained. As a reduction case of the first hierarchy, a generalized nonlinear coupled Schroedinger equation, the standard heat-conduction and a formalism of the well known Ablowitz, Kaup, Newell and Segur hierarchy are given, respectively. As a reduction case of the second hierarchy, the nonlinear Schroedinger and modified Korteweg de Vries hierarchy and a new integrable system are presented. Especially, a coupled generalized Burgers equation is generated.     

Versal unfolding of equivariant bifurcation problems in more general case under two equivalent groups

For the unfolding of equivariant bifurcation problems with two types of state variables in the presence of parameter symmetry,the versal unfolding theorem with respect to left-right equivalence is obtained by using the related methods and techniques in the singularity theory of smooth map-germs.The corresponding results in[4,9]can be considered as its special cases.A relationship between the versal unfolding w.r.t.left-right equivalence and the versal deformation w.r.t.contact equivalence is established.     

HARDY-SOBOLEV INEQUALITIES WITH GENERAL WEIGHTS AND REMAINDER TERMS

The Hardy-Sobolev inequality with general weights is established, and it is shown that the constant is optimal. The two weights in this inequality are determined by a Bernoulli equation. In addition, the authors obtain the Hardy-Sobolev inequality with general weights and remainder terms. By choosing special weights, it turns to be many versions of the Hardy-Sobolev inequality and the Caffarelli-Kohn-Nirenberg inequality with remainder terms in the literature.     

TESTING SPHERICITY IN A GMANOVA-MANOVA MODEL WITH NORMAL ERROR

This article presents a statistic for testing the sphericity in a GMANOVA- MANOVA model with normal error. It is shown that the null distribution of this statistic is beta and its nonnull distribution is given in series form of beta distributions.     

我校首次获得国家自然科学基金重点项目资助

日前，我校理学院楼森岳教授课题组和中国海洋大学联合申报的“灾害性天气和气候研究的数学物理问题”项目获得国家自然科学基金重点项目资助，共获资助经费180万元．这是我校首次获得国家自然科学基金重点项目，标志着我校在基础领域的研究水平跃上新台阶．     

Algebro-Geometric Solution to Two New （2＋1）-Dimensional Modified Kadomtsev-Petviashvili Equations

Two new （2＋1）-dimensional modified Kadomtsev-Petviashvili （mKP） equations are presented, which are related to a hierarchy of （1＋1）-dimensional soliton equations. Through the nonlinearization of Lax pair and the Riemann-Jacobi inversion technique, the algebro-geometric solutions of both the mKP equations are obtained.     

CONSTRAINT VIOLATION STABILIZATION OF EULER-LAGRANGE EQUATIONS WITH NON-HOLONOMIC CONSTRAINTS

Two constraint violation stabilization methods are presented to solve the Euler Lagrange equations of motion of a multibody system with nonholonomic constraints. Compared to the previous works, the newly devised methods can deal with more complicated problems such as those with nonholonomic constraints or redundant constraints, and save the computation time. Finally a numerical simulation of a multibody system is conducted by using the methods given in this paper.     

《数学物理学报》中、外文征稿简则

<正>一、《数学物理学报》(中、英文版)是我国数学物理学界委托中国科学院武汉物理与数学研究所主办的,以刊登数学与物理科学的边缘学科中具有创造性的代表学科水平的科研成果为主的综合性学术刊物。读者对象是国内外本学科范围的科技工作者。《数学物理学报》1981年4月创刊,为中、外文混合版季刊。自1982年4月起分中、外两种文本同时发行(季刊),内容不相同。2003年开始中文版改为双月刊。     

Preface

These two special issues of Acta Mathematica Scientia are dedicated to Professor James Glimm on the occasion of his seventy-fifth birthday.     

CONTINUITY AND HAUSDORFF DIMENSION OF JULIA SET CONCERNING YANG-LEE ZEROS

Considering the Julia set J（Tλ） of the Yang-Lee zeros of the Potts model on the diamond hierarchical Lattice on the complex plane, the authors proved that HDJ（Tλ） 〉 1 and discussed the continuity of J（Tλ） in Hausdorff topology for λ∈R.