Piecewise Polynomial Collocation for Volterra-type Integral Equations of the Second Kind

The exact solution of a given integral equation of the secondkind of Volterra type(with regular or weakly singular kernel)is projected into the space of (continuous) piecewise polynomialsof degree m 1 and with prescribed knots by using collocationtechniques. It is shown that a number of discrete methods forthe numerical solution of such equations based on product integrationtechniques or on finite-difference methods are particular discreteversions of collocation methods of the above type. The errorbehaviour of approximate solutions obtained by collocation (includingtheir discretizations) is discussed.     

Discrete Galerkin Methods for Fredholm Integral Equations of the Second Kind

The discrete Galerkin and discrete iterated Galerkin methodsarise when the integrals required in the Galerkin and iteratedGalerkin methods are calculated using numerical integration.In this paper, prolongation and restriction operators are usedto give an error analysis for these two discrete Galerkin methods.From this analysis, we can then give conditions on the quadratureerrors, under which the two discrete Galerkin solutions havethe same order of convergence as their exact counterparts.     

On the Discrete Galerkin Method for Fredholm Integral Equations of the Second Kind

In the present paper, we refine some previous results on thediscrete Galerlcin method and the discrete iterated Galerkinmethod for Fredholm integral equations of the second kind. Byconsidering discrete inner products and discrete projectionson the same node points but with different quadrature rules,we are able to treat more appropriately kernels with discontinuousderivatives. In particular, for Green's function kernels weobtain a Nystr?m-type method which has the same order of convergenceas the corresponding Nystr?m method for infinitely smooth kernels.     

The Numerical Solution of Two-Dimensional Volterra Integral Equations by Collocation and Iterated Collocation

While the numerical solution of one-dimensional Volterra integralequations of the second kind with regular kernels is now wellunderstood there exist no systematic studies of the approximatesolution of their two-dimensional counterparts. In the presentpaper we analyse the numerical solution of such equations bymethods based on collocation and iterated collocation techniquesin certain polynomial spline spaces. The analysis focuses onthe global convergence and local superconvergence propertiesof the approximating spline functions.     

球面上第二类Fredholm积分方程配置方法

球面上第二类 Fredholm积分方程经球坐标变换可化为矩形域 H0 上的问题求解 .用有限元法构造H0 上的插值函数 ,它必须满足在 H0 的左、右两边连续 ,然后用配置方程求方程的近似解     

Convergence of Collocation Method with Delta Functions for Integral Equations of First Kind

Integral equations of first kind with periodic kernels arising in solving partial differential equations by interior source methods are considered. Existence and uniqueness of solution in appropriate spaces of linear analytic functionals is proved. Rate of convergence of collocation method with Dirac’s delta-functions as the trial functions is obtained in case of uniform meshes. In case of an analytic kernel the convergence rate is exponential.     

一类非线性积分方程的分段多项式配置解及其迭代配置解

§1.引言 分段多项式配置及其迭代配置方法(以下简称配置方法)以其计算简单、超收敛性等特点在积分方程的数值分析中倍受重视.本文考虑如下一类非线性积分方程:其中,y,φ∈L_∞(I),?_t∈I,k_t(t,s)∈L_1(I).Chandrasekhar H-积分方程是(1.1)的特殊情形,对迁移理论很重要.     

求解Lavrentiev迭代方程的多尺度快速配置算法

考虑了第一类Fredholm积分方程的求解.采用有矩阵压缩策略的多尺度配置方法来离散Lavrentiev迭代方程,在积分算子是弱扇形紧算子时,给出近似解的先验误差估计,并给出了改进的后验参数的选择方法,得到了近似解的收敛率.最后,举例说明算法的有效性.     

Stability Analysis of Runge-Kutta Methods for Volterra Integral Equations of the Second Kind

Stability analysis of Volterra-Runge-Kutta methods based onthe basic test equation of the form where is a complex parameter, and on the convolution test equation where and are real parameters, is presented. General stabilityconditions are derived and applied to construct numerical methodswith good stability properties. In particular, a family of second-orderV^o-stable Volterra-Runge-Kutta methods is obtained. No V^o-stablemethods of order greater than one have been presented previouslyin the literature.     

利用随机模拟方法求解第二类积分方程

给出一种求解第二类Fredholm和Volterra积分方程的数值算法,算法在数值积分技术的基础上使用Monte Carlo随机模拟方法求积分方程的近似解.通过数值例子证明了该算法是有效的.     

The Galerkin Method for Integral Equations of the First Kind with Logarithmic Kernel: Applications

The aim of this paper is to discuss the numerical performanceof the Galerkin method for the approximate solution of severaltwo-dimensional Fredholm integral equations of the first kindwith logarithmic kernel, and for the approximation of linearfunctionals of the solution. Predicted rates of convergenceare obtained from the theory in Sloan & Spence (1987), andthese are compared with the numerical rates for the case ofpiecewise constant approximation over equal subintervals. Thephenomenon of ‘superconvergence’ is analysed indetail and some examples are given which attain remarkably highrates of convergence.     

The Galerkin Method for Integral Equations of the First Kind with Logarithmic Kernel: Theory

The aim of this paper is to develop a straightforward analysisof the Galerkin method for two-dimensional boundary integralequations of the first kind with logarithmic kernels. A distinctivefeature of the analysis is that no appeal is made to ‘coercivity’,as a result of which some existence questions cannot be answereddirectly. In return, however, the analysis has no special difficultyin handling corners, cusps, or open arcs. Instead of coercivity,the central feature of the analysis is the positive-definiteproperty of the integral operator for small enough contours.Rates of convergence are predicted theoretically and, in particular,certain linear functionals are shown to exhibit ‘superconvergence’.Numerical results supporting the theory are given in the companionpaper Sloan & Spence (1987) for problems on both open andclosed polygonal arcs.     

On Spline Collocation for Singular Integral Equations

This paper is devoted to the approximate solution of one-dimensional singular integral equations on a closed curve by spline collocation methods. As the main result we give conditions which are sufficient and in special cases also necessary for the convergence in SOBOLEV norms. The paper is organized as follows. In chapter 1 we indicate some definitions and some facts about projection methods. In chapter 2, we generalize a technique developed in [1] and study the convergence of collocations using splines of odd degree in periodic SOBOLEV spaces. In chapter 3, we apply our method to collocations by splines of even degree and consider the case of systems of equations. And in the last chapter, 4, the results are applied to singular integral equations and compared with known facts about piecewise linear spline collocation for such equations.     

Spline Collocation for Cordial Volterra Integral Equations

We study the convergence and convergence speed of two versions of spline collocation methods on the uniform grids for linear Volterra integral equations of the second kind with noncompact operators.     

An Iterative Method for the Solution of Fredholm Integral Equations of the Second Kind

An iterative method for the solution of the linear Fredholmintegral equation is discussed. Various types of quadraturerule are used to replace the integral and the order of convergenceand error estimates are found for each rule. A few examplesare considered, including one with a weakly singular kernel.     

A New Analysis of Volterra-Fredholm Boundary Integral Equations of Second Kind

In this paper, we study the existence, uniqueness and regularity of the solutions to Volterra-Fredholm boundary integral equations of second kind in a kind of boundary function spaces.     

Preconditioned Conjugate Gradient Methods for Integral Equations of the Second Kind Defined on the Half-Line

1.IntroductionInthispaPer,westudynumericalsolutionstointegralequationsofthesecondkinddefinedonthehalfline.Morepreciselyweconsidertheequationy(t)+Iooa(t,s)y(s)ds=g(t),OS相似文献