共查询到20条相似文献,搜索用时 62 毫秒
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通过变量替换或分部积分可建立关于某些积分的方程,通过引入辅助积分可建立关于某些积分的方程组,解这些方程或方程组可得所求积分. 相似文献
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高凌云 《数学年刊A辑(中文版)》2017,38(1):023-30
作者主要研究了一类复微分-差分方程组的有限级整函数解,得到了一有趣的结果,将复微分(或差分)方程中相关结果推广至复微分-差分方程组中. 相似文献
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首先采用Riccati方程的解的性质和试探函数法找到了Riccati方程的八种类型的显式新精确解.其次运用李群分析法获得了KdV-Burgers-Kuramoto方程的约化方程和群不变解.然后利用Riccati方程的八种类型的显式新精确解和广义Tanh函数法给出了约化方程的多种类型的显式新精确解.最后将Riccati方程的八种类型的显式新精确解与李群分析法和广义Tanh函数法相结合,得到了KdV-Burgers-Kuramoto方程的多种类型的显式新行波解.这些技巧和方法可以用于求解其它一些非线性偏微分方程或方程组的显式新精确解. 相似文献
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通过函数变换与第二种椭圆方程相结合的方法,构造变系数耦合KdV方程组的复合型新解.步骤一、给出第二种椭圆方程的几种新解.步骤二、利用函数变换与第二种椭圆方程相结合的方法,在符号计算系统Mathematica的帮助下,构造变系数耦合KdV方程组的由Riemannθ函数、Jacobi椭圆函数、双曲函数、三角函数和有理函数组合的复合型新解,这里包括了孤子解与周期解复合的解、双孤子解和双周期解. 相似文献
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邵周德 《数学年刊B辑(英文版)》1987,(3)
本文主要讨论形如(N)d/(dt)D(t,x_t)=f(t,x_t)的中立型泛函微分方程解对 t 的可微性问题.给出了方程(N)和初始函数使得其对应的解在其存在范围内对 t 连续可微的充分条件,并证明了满足以上条件的初始函数全体在初始函数集合中是稠密的. 相似文献
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汪玥 《数学的实践与认识》2012,42(9):154-161
提出了一种求解线性和非线性对流扩散方程的流函数松弛方法.方法的主要思想是利用流函数松弛近似将原始的方程转化成等价的松弛方程组,新的松弛方程组是带源项的双曲系统.通过稳定性分析可以知道新系统的耗散系数可由松弛系数调整.数值实现亦证明这个方法可以快速有效地描述对流扩散方程的解. 相似文献
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利用修正的简单方程法对变系数李方程组进行求解,给出了变系数李方程组的双曲函数形式的行波解,当参数取特殊值时,便可以得到该方程组的精确孤波解. 相似文献
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Kunyang Wang Feng Dai 《分析论及其应用》2007,23(1):50-63
As early as in 1990, Professor Sun Yongsheng, suggested his students at Beijing Normal University to consider research problems on the unit sphere. Under his guidance and encouragement his students started the research on spherical harmonic analysis and approximation. In this paper, we incompletely introduce the main achievements in this area obtained by our group and relative researchers during recent 5 years (2001-2005). The main topics are: convergence of Cesaro summability, a.e. and strong summability of Fourier-Laplace series; smoothness and K-functionals; Kolmogorov and linear widths. 相似文献
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H. H. Cuenya M.D. Lorenzo C. N. Rodriguez 《分析论及其应用》2007,23(2):162-170
In this paper we study best local quasi-rational approximation and best local approximation from finite dimensional subspaces of vectorial functions of several variables. Our approach extends and unifies several problems concerning best local multi-point approximation in different norms. 相似文献
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Yuxian Zheng 《分析论及其应用》2006,22(2):136-140
In this paper, we study the commutators generalized by multipliers and a BMO function. Under some assumptions, we establish its boundedness properties from certain atomic Hardy space Hb^p(R^n) into the Lebesgue space L^p with p 〈 1. 相似文献
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《计算数学》2014,(2)
<正>August 10-14,2015Beijing,ChinaThe International Congress on Industrial and Applied Mathematics(ICIAM)is the premier international congress in the field of applied mathematics held every four years under the auspices of the International Council for Industrial and Applied Mathematics.From August 10 to 14,2015,mathematicians,scientists 相似文献
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《中国科学 数学(英文版)》2014,(8)
<正>May 26,2014,Beijing Science is a human enterprise in the pursuit of knowledge.The scientific revolution that occurred in the 17th Century initiated the advances of modern science.The scientific knowledge system created by 相似文献
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W.M.Shah A.Liman 《分析论及其应用》2004,20(1):16-27
Let P(z)=∑↓j=0↑n ajx^j be a polynomial of degree n. In this paper we prove a more general result which interalia improves upon the bounds of a class of polynomials. We also prove a result which includes some extensions and generalizations of Enestrǒm-Kakeya theorem. 相似文献
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In this paper, the authors study the boundedness of the operator [μΩ, b], the commutator generated by a function b ∈ Lipβ(Rn)(0 <β≤ 1) and the Marcinkiewicz integrals μΩ, on the classical Hardy spaces and the Herz-type Hardy spaces in the case Ω∈ Lipα(Sn-1)(0 <α≤ 1). 相似文献
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A.Al-Shuaibi F.Al-Rawjih 《分析论及其应用》2004,20(1):28-34
Given the Laplace transform F(s) of a function f(t), we develop a new algorithm to find an approximation to f(t) by the use of the classical Jacobi polynomials. The main contribution of our work is the development of a new and very effective method to determine the coefficients in the finite series expansion that approximation f(t) in terms of Jacobi polynomials. Some numerical examples are illustrated. 相似文献
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Francois Chaplais 《分析论及其应用》2006,22(4):301-318
In applications it is useful to compute the local average empirical statistics on u. A very simple relation exists when of a function f(u) of an input u from the local averages are given by a Haar approximation. The question is to know if it holds for higher order approximation methods. To do so, it is necessary to use approximate product operators defined over linear approximation spaces. These products are characterized by a Strang and Fix like condition. An explicit construction of these product operators is exhibited for piecewise polynomial functions, using Hermite interpolation. The averaging relation which holds for the Haar approximation is then recovered when the product is defined by a two point Hermite interpolation. 相似文献