共查询到20条相似文献,搜索用时 15 毫秒
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51.Intr0ducti0nInthispaper,weconsidertheexistenceofalmostperiodicsoluti0nsforthefoll0wingneutralfunctionaldifferentialebuationwithpiecewiseconstantargument:wherep,qarenonzeroconstants,p(t)lsanalmostper1odicfunctlon,g:RXRXR-Risanalm0stperiodicfunctionintanduniformlyonRXR,andL.jstandsforthegreatest-integerfunction.Notethatforanyintegern,if2n-10)andtheequations(1),(2)areadvanced(orretardedrespectively).Differentialequationswithpiecewiseconstantar… 相似文献
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In this paper we study numerical approximation of linear neutral differential equations on infinite interval using equations with piecewise constant arguments. As an application of our approximation results, we obtain stability theorems for some classes of linear delay and neutral difference equations. 相似文献
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胡适耕 《应用数学与计算数学学报》1994,8(2):38-44
本文考虑如下的泛函微分方程边值问题:x″(t)=f(t,x_t,x′(t))(0≤t≤b),x_0=x_t,x′(0)=x′(b),利用基于度理论的一定不动点定理,得到了以上边值问题有非负解的某些充分条件。 相似文献
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讨论了二阶模糊线性微分方程边值问题{y+p(t)y'+q(t)y=g(t),t∈[a,b],t∈[a,b]y(a)=(a),y(b)=(β),(α),(β)∈E1的模糊近似解,即利用配置法将微分方程转化为函数线性方程组,针对其系数函数的符号的不同,通过计算函数线性方程组获得了原模糊微分方程的模糊近似解. 相似文献
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该文利用k- 集压缩算子抽象连续性定理和一些分析技巧研究了一类具有偏差变元的二阶泛函微分方程周期解的存在性. 该文的结果推广和改进了文献[1-2]的主要结果. 相似文献
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本文讨论了向前型分段连续微分方程Euler-Maclaurin方法的收敛性和稳定性,给出了Euler-Maclaurin方法的稳定条件,证明了方法的收敛阶是2n+2,并且得到了数值解稳定区域包含解析解稳定区域的条件,最后给出了一些数值例子用以验证本文结论的正确性. 相似文献
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Da Xiong Piao 《数学学报(英文版)》2002,18(2):263-276
In this paper, we study the existence of almost periodic solutions of neutral differential difference equations with piecewise
constant arguments via difference equation methods.
Received February 18, 2000, Accepted September 30, 2000. 相似文献
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该文利用上下藕合解和单调迭代法,讨论了一阶具有分段常数变量微分方程的反边值和非线性边值问题x′(t)=f(t,x(t),x([t-k])), x(0)+h(x(T))=0, 这里h(θ)∈C\+1(R), h′(θ)>0,获得了这些问题的解的存在和唯一性. 相似文献
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ZhengQiuZHANG ZhiChengWANG 《数学学报(英文版)》2005,21(1):95-108
We obtain sufficient conditions for the existence of periodic solutions of the following second order nonlinear differential equation:ax(t) bx^2k-1(t) cx^2k-1(t) g(x(t-T1),x(t-T2) ) = p(t) = p(t 2π)Our approach is based on the continuation theorem of the coincidence degree, and the priori estimate of periodic solutions. 相似文献
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本文研究形如(1.1)的第二特征上界问题,得到了定理1 和定理2,其中定理1 的估计系数与[a,b]无关,定理2 的结果在一定条件下比定理1 好. 相似文献
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A General Comparison Result for Higher Order Nonlinear Difference Equations With Deviating Arguments
John R. Graef Agnes Miciano-Cariño Chuanxi Qian 《Journal of Difference Equations and Applications》2013,19(11):1033-1052
The authors consider m -th order nonlinear difference equations of the form D m p x n + i h j ( n , x s j ( n ) )=0, j =1,2,( E j ) where m S 1, n ] N 0 ={0,1,2,…}, D 0 p x n = x n , D i p x n = p n i j ( D i m 1 p x n ), i =1,2,…, m , j x n = x n +1 m x n , { p n 1 },…,{ p n m } are real sequences, p n i >0, and p n m L 1. In Eq. ( E 1 ) , p = a and p n i = a n i , and in Eq. ( E 2 ) , p = A and p n i = A n i , i =1,2,…, m . Here, { s j ( n )} are sequences of nonnegative integers with s j ( n ) M X as n M X , and h j : N 0 2 R M R is continuous with uh j ( n , u )>0 for u p 0. They prove a comparison result on the oscillation of solutions and the asymptotic behavior of nonoscillatory solutions of Eq. ( E j ) for j =1,2. Examples illustrating the results are also included. 相似文献
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In this paper, we apply a new procedure initially developed in Refs. [H. El-Owaidy and H.Y. Mohamed. "On the periodic solutions for nth order difference equations". Journal of Applied Mathematics and Computation , (to appear); "The necessary and sufficient conditions of existence of periodic solutions of nonautonomous difference equations". Journal of Applied Mathematics and Computation , (to appear)] to simplify the use of Carvalho's method to the case of discrete difference equations, in order to find the periodic solutions of second order linear difference equations. We can also find the complex periodic solutions. 相似文献
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We discuss differential equations with nonlinear boundary conditions. We formulate sufficient conditions under which problems
with deviating arguments have quasisolutions or solutions. To obtain the results, we apply the method of monotone iterations. 相似文献
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Tadeusz Jankowski 《Applicable analysis》2013,92(2):341-356
In this paper, the method of quasilinearization has been extended to antiperiodic boundary value problems of nonlinear functional differential equations. It is shown that iterations converge to the unique solution and this convergence is semi-superlinear. 相似文献
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二阶非线性泛函微分方程的振动性质 总被引:1,自引:0,他引:1
研究了一类二阶非线性泛函微分方程解的振动性质.在一定条件下,应用分类讨论和分析的方法,建立了一个新的振动性定理,推广和改进了已知的结果. 相似文献
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