共查询到17条相似文献,搜索用时 46 毫秒
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本文利用矩阵Riccati技巧,平均技巧及矩阵不等式,建立形如[P(t)Y']'+Q(t)Y=0的二阶矩阵微分系统的一些新的区间振动准则.所得结果推广,改进和包含一系列已有的结论,并能应用于已知准则不能适用的若干情形. 相似文献
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王其如 《数学年刊A辑(中文版)》2005,(1)
本文利用矩阵Riccati技巧,平均技巧及矩阵不等式,建立形如[P(t)Y']' Q(t)Y=0的二阶矩 阵微分系统的一些新的区间振动准则.所得结果推广,改进和包含一系列已有的结论,并能应用于已知 准则不能适用的若干情形. 相似文献
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讨论了二阶线性矩阵微分系统(P(t)Y′(t))′+Q(t)Y(t)=0,t≥t0,其中P(t),Q(t) 和Y(t)是n×n实连续矩阵函数, P(t)和Q(t)是对称的且P(t)>0是正定矩阵.利用推广的Riccati变换,采用两种不同的方法,得到了该系统振动的若干判据.所得结果推广和改进了已知的相应结果. 相似文献
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本文利用Riccati技巧和平均技巧,研究一类二阶非线性微分方程的振动性,得到了这类方程振动的若干新的判别准则。 相似文献
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通过Kummer变换,建立了线性矩阵微分系统(P(t)Y′)′ Q(t)Y=0的振动性判别准则,改进了文[4],[5]的振动性判别准则,并且简化了文[7]的证明. 相似文献
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运用Riccati技巧,正线性泛函和广义平均对方法,讨论具有阻尼项的二阶自共轭矩阵微分系统(P(t)Y’(t))’+r(t)P(t)Y’(t)+Q(t)Y(t)=0,t≥0,获得了一些新的振动定理.所得结果改进和推广了许多已知结论.特别地,补充了大量存在性结果,并能处理以前振动准则不能解决的问题. 相似文献
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一类二阶非线性泛函微分方程的振动性 总被引:1,自引:0,他引:1
本文讨论二阶非线性泛函微分方程(a(t)y′(t))′+p(t)y′(t-τ(t))-q(t)f(y(t))=0,t≥t0,(1)(a(t)y′(t))′-p(t)y′(t+τ(t))-q(t)f(y(t))=0,t≥t0,(2)获得了方程(1)和(2)振动的充分性判据,推广和改进了已知的一些结果. 相似文献
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1.IntroductionOscillationtheoryforellipticdifferentialequationswithvariablecoefficielltshasbeenextensivelydevelopedinrecentyearsbymanyauthors(seee-g-,Allegretto[1,2l,Bugir['],Fiedler[5]'KitamuraandKusano['],Kural4]KusanoandNaitol1o]'NaitoandYoshidal12]'NoussairandSwanson[l3'14]'Swansonl15'l6]andthereferencescitedtherein).Inthispaper,weareconcernedwiththeoscillatorybehaviorofsolutionsofsecondorderellipticdifferelltialequatiollswithalternqtingcoefficients.Asusual,pointsinn-dimensionalEucli… 相似文献
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OSCILLATION CRITERIA FOR CERTAIN NONLINEAR DIFFERENCE EQUATIONS 总被引:1,自引:0,他引:1
1 IntroductionIn a number of recent papers [l-61 oscil1ation of solutions of second ordernonlinear difference equations has been investigated. ln this paper, we studythe oscil1atory behavior of solutions of the second order nonlinear differenceequationA(r.--lAx.--l) p.f(x.) = 0, n = l, 2,'' (1)where the difference operator a is defined by Ax. = xn 1 -- xn) n = 1, 2,' ')and the functions r, p, f are to be specified in the following text. By a solutionof Eq.(1), we mean a real sequence x = … 相似文献
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In this paper, we present new oscillation criteria for certain class of second order nonlinear delay difference equations by using an averaging technique. 相似文献
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Rongkun Zhuang Hongwu Wu 《Annals of Differential Equations》2011,(1):111-118
Using the integral average technique and a new function,some new oscillation criteria related to Euler integral are obtained for second order nonlinear differential equations with damping and forcing. Our results are of a higher degree of generality than some previous results. Information about the distribution of the zeros of solutions to the system is also obtained. 相似文献
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Huang Xianyong 《Annals of Differential Equations》2007,23(1):26-34
By using the integral averaging technique, oscillating criteria for certain even order neutral differential equation with deviating arguments are established. These results extend some known oscillation criteria due to Xu and Xia. 相似文献
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Jinchang Yu 《应用数学年刊》2017,33(2):203-211
By Riccati transformation, we establish some new oscillation criteria for a class of even order delay differential equations with nonlinear term. In some sense, the results obtained extend some known results in the literature. 相似文献