弱对称Markov积分半群的表示

本文研究了弱对称Markov积分半群的表示.利用积分的方法,获得了弱对称Markov积分半群的Kendall和Karlin-McGregor表示,推广了转移函数的Kendall和Karlin-McGregor表示.     

C~n空间中的第Ⅰ型B-M积分表示的拓广

利用C~n中有界凸区域的第1型积分表示的拓广形式和第Ⅰ型的 Bochner-Martinelli公式,拓广了第Ⅰ型Bochner-Martinelli积分表示。已有的Bochner-Martinelli积分表示及其拓广形式(除了Bochner-Ono公式外)都可以视为文中积分表示的特款。     

积分半群的表示及其在抽象积微分方程中的应用

讨论了积分半群与C0半群的关系,给出了用一组C0半群的积分序列的极限表示积分半群的表示公式.利用该公式证明了积分半群的其它表示式.最后用该公式给出了求解一类抽象积微分方程的新方法.     

无穷求和的计算Ⅰ

应用积分变换法和参数求导法,得到了一些无穷求和的积分表示.给出了这些积分表示的封闭形式或者数值解.     

多复变函数哥西型积分的边界性质

<正> §1.引言对多复变解析函数已经有不少人得到了各种不同区域的各种积分表示,但对这些积分表示的边界性质研究得并不多.最早是陆启铿和锺同德,(?)研究了Bochner-Martinelli 的积分表示的边界性质,其后(?)研究了(?)的积分表示的边界性质,他们都得到了类似于单复变函数的(?)Plemelj 公式.最近(?)详细研究了多圆柱的积分表示的边界性质及其应     

广义F积分的表示(I)

与Ｓｕｇｅｎｏ的Ｆ积分表示理论相比较,本文探讨了广义Ｆ积分的表示问题,给出了几个表示定理,如中值定理、重排转化定理等     

Clifiord分析中双正则函数及调和函数在平面上的积分表示

本文研究了取值在Clifiord代数上双正则函数及调和函数在超复平面上积分表示的问题.利用构造核函数的方法,获得了双正则函数及调和函数在超复平面上的积分表示公式,这些结果推广了Clifiord分析中正则函数在超复平面上的积分表示公式.     

Clifford分析中双正则函数及调和函数在平面上的积分表示（英文）

本文研究了取值在Clifford代数上双正则函数及调和函数在超复平面上积分表示的问题.利用构造核函数的方法,获得了双正则函数及调和函数在超复平面上的积分表示公式,这些结果推广了Clifford分析中正则函数在超复平面上的积分表示公式.     

模糊有界变差函数全变差的积分表示与距离导数

定义和讨论了模糊数值函数的距离导数,给出了模糊有界变差函数全变差的积分表示.发现模糊绝对连续函数是几乎处处距离可导的,距离导数的积分等于其原函数的总变差,从而给出了模糊有界变差函数全变差的积分表示.     

对数三角函数的定积分

定义了三种积分表示的两元函数.这些两元函数有伽马函数表示,可以展开为幂级数.在积分符号内展开被积函数,先积分,再求和,也得到级数展开.对比展开系数,就得到一些对数三角函数定积分的值.选取合适的围道,得到其他两类对数三角函数定积分的值.     

The Poisson and the Biharmonic Equations in the Interior of a Convex Polygon

A new method for analyzing linear elliptic partial differential equations in the interior of a convex polygon was developed in the late 1990s. This method does not rely on the classical approach of separation of variables and on the use of classical integral transforms and therefore is well suited for the investigation of the biharmonic equation. Here, we present a novel integral representation of the solution of the biharmonic equation in the interior of a convex polygon. This representation contains certain free parameters and therefore is more general than the one presented in [1]. For a given boundary value problem, by choosing these free parameters appropriately, one can obtain the simplest possible representation for the solution. This representation still involves certain unknown boundary values, thus for this formula to become effective it is necessary to characterize the unknown boundary values in terms of the given boundary conditions. This requires the investigation of certain relations refereed to as the global relations. A general approach for analyzing these relations is illustrated by solving several problems formulated in the interior of a semistrip. In addition, for completeness, similar results are presented for the Poisson equation by employing an integral representation for the Laplace equation which is more general than the one derived in the late 1990s.     

The mKdV Hierarchy With Integral Source

1 IntroductionThe nonlinear Schrodinger equation with integral source (NLSEIS) and the KdV equationwith integral source (KdVIS) were integrated by inverse scattering method in [1,2] and -methodin [3]. However, since the evolution equations for eigenfunction in Lax representation for NLSEISand KdVIS were not obtained, the determining scatterging data in [1-3] was quite complicatedand required some skill.In the present paper we discuss the new mKdV hierarchy with integral source (mKdV…     

推广的KdV方程特征问题解的存在唯一性

推广的KdV方程u_t+αuu_x+μu_x3+εu_x5=0[1]是典型的可积方程.它先后在研究冷等离子体中磁声波的传播[2],传输线中孤立波[3]和分层流体中界面孤立波[4]时导出.本文对推广的KdV方程的特征问题,在Riemann函数的基础上,设计一恰当结构,并由此化待征问题为一与之等价的积分微分方程.而该积分微分方程对应的映射E是列自身的映射[5],依不动点原理,积分微分方程有唯一的正则解,即推广的KdV方程的特征问题有唯一解,且由积分微分方程序列所得的迭代解于Ω上一致收敛.     

RESEARCH ANNOUNCEMENTS High order Zumerical Solution of Integral Transport Equation in slab Geometry

There are some common numerical methods for solving neutron transport equation, which including the well-known discrete ordinates method, PN approximation and integral transport methods[1]. There exists certain singularities in the solution of transport equation near the boundary and interface[2]. It gives rise to the difficulty in the construction of high order accurate numerical methods. The numerical solution obtained by now can not attain the second order convergent accuracy[3,4].     

Monotonic positive solution of a nonlinear quadratic functional integral equation

The existence of positive monotonic solutions, in the class of continuous functions, for some nonlinear quadratic integral equation have been studied in [4], [5], [6], [7] and [8]. Here we are concerning with a nonlinear quadratic integral equation of Volterra type and we shall prove the existence of at least one L₁-positive monotonic solution for that equation under Carathèodory condition.     

A finite element method for the double-layer potential solutions of the Neumann exterior problem

A variational formulation for the integral equation used for the double layer potential solution of the Neumann exterior problem in the Laplace equation was proposed in [4]. This formulation allows the use of a finite element method which we describe and experiment here.     

Dual integral equations related to the kontorovich-lebedev transform : PMM vol. 38, n 6, 1974, pp. 1090–1097

We study the dual integral equations related to the Kontorovich-Lebedev integral transforms arising in the course of solution of the problems of mathematical physics, in particular of the mixed boundary value problems for the wedge-shaped regions. We show that the solutions of these equations can be expressed in quadratures, using the auxilliary functions satisfying the integral Fredholm equation of second kind with a symmetric kernel.At present, the dual equations investigated in most detail are those connected with the Fourier and Hankel integral transforms. The results obtained and their applications are given in [1–3]. A large number of papers also deal with the theory and applications of the dual integral equations connected with the Mehler-Fock integral transform and its generalizations [4–11]., The dual integral transforms considered in the present paper belong to a more complex class than those listed above, and so far, no effective solution has been obtained for them. The only relevant results known to the authors are those in [12, 13]. In [12] a method of solving the equations (1.2) is given for a single particular value of the parameter γ = π/2, while in [13] the dual equations of the type under consideration are reduced to a solution of an infinite system of linear algebraic equations.     

关于“广义Liénard方程的周期解”一文的注记

本文研究广义Ｌｉéｎａｒｄ方程x+f(x,x)x+g(x)=0的周期解的存在性，所得结果不仅较大地改进了文［１］的定理而且还指出了文［１］中的错误。     

A singular integral equation with the Cauchy kernel on a closed interval in a class of distributions

In the present paper, we introduce the notion of a singular integral with the Cauchy kernel for distributions and consider a singular integral equation with the Cauchy kernel on a closed interval for the case in which the right-hand side is a distribution that admits a representation in the form of the sum of a distribution vanishing in neighborhoods of the endpoints and an ordinary function satisfying the Hölder condition. The solution is also sought in the form of a distribution. Distributions are treated as linear functionals on some test functions. We analyze the solvability of the equation in the class of distributions and obtain explicit formulas for the inversion of this equation, similar to formulas for ordinary solutions. To analyze the solvability of the singular integral equation, we use an approach based on the consideration of the Riemann boundary value problem for analytic functions with a generalized boundary condition. When stating and studying this problem, we use the results in [1, 2].Translated from Differentsialnye Uravneniya, Vol. 40, No. 9, 2004, pp. 1208–1218.Original Russian Text Copyright © 2004 by Setukha.     

Navier-Stokes方程的精确解——Dirac-Pauli表象的复变函数理论及其在流体力学中的应用(Ⅱ)

本文是文[1]的继续。在文[1]中我们应用Dirac-Pauli表象的复变函数理论并引入Kaluza“鬼”坐标,将不可压缩粘流动力学的Navier-Stokes方程化成只有一对复未知函数的非线性方程。在本文中,我们将除时间之外的复自变量进行重新组合,从而成对地减少了复自变量的数目。最后,我们将Navier-Stokes方程化成经典的Burgers方程。联结Burgers方程与扩散方程的Cole-Hopf变换实际上是B?cklund变换,而扩散方程众所周知是具有通解的。于是,我们利用B?cklund变换求得了Navier-Stokes方程的精确解。