ON THE BOUNDEDNESS AND THE STABILITY PROPERTIES OF SOLUTION OF CERTAIN FOURTH ORDER DIFFERENTIAL EQUATIONS

This paper investigates equation(1)in two cases:(i)P≡0,(ii)P(≠O)satisfies|P(t,x,y,z,ω)|≤(A |y| |z| |ω|)q(t),where q(t)is a nonnegative function of t.For case(i)the asymptotic stability in the large of the trivial solution x=0 is investigatedand for case(ii)the boundedness result is obtained for solutions of equation(1).Theseresults improve and include several well-known results.     

An Oscillation Criterion for Second Order Superlinear Differential Equations

61.IntroductionConsiderthesecondordersuperlinearequationx'(t) p(t)X'(t) q(t)1x(t)l"sgnx(t)=o,t>to,(1)wherea>l,pandq:[t,'co)-R=(-co,oo)arecontinuous.Weconsideronlysuchsolutionsxofequation(l)whichexistonsomeinterval[t.,oo),t.>t,>o.Asolutionofequation(l)issaidtobeoscillatoryifithasarbitrarilylargezerosandotherwise,itissaidtobenonoscillatory.Equation(l)iscalledoscillatoryifallofitssolutionsareoscilllatory.Forthespecialcasewherep(t)=Oli.e.,forthedifferentialequationx'(t) q(t)lx(t)l"sgnx(t)=o,a>1-…     

OSCILLATION OF CERTAIN PARTIAL RETARDED DIFFERENTIAL EQUATIONS

ＯＳＣＩＬＬＡＴＩＯＮＯＦＣＥＲＴＡＩＮＰＡＲＴＩＡＬＲＥＴＡＲＤＥＤＤＩＦＦＥＲＥＮＴＩＡＬＥＱＵＡＴＩＯＮＳＣｈｅｎＷｅｎｄｅｎｇ（陈文灯）（ＣｅｎｔｒｅｉｎｓｔｉｔｕｔｅｏｆＦｉｎａｎｃｅ）＆ＹｕＹｕａｎｈｏｎｇ（俞元洪）（Ｉｎｓｔｉｔｕｔｅｏ...     

非线性二阶微分方程的振动准则

本文建立了非线性二阶微分方程(a(t)x′(t))′+p(t)x′(t)+q(t)|x(t)|^α sgn x(t)=0的一个新的振动准则，并改进了文［１］的结果。     

一类边值问题的振动准则

本文考虑一类中立型泛函偏微分方程的边值问题。我们的主要工具是平均技巧，利用有关的泛函微分不等式来建立这类边值问题解的振动准则。     

一类三次系统的定性分析

一类三次系统的定性分析陈文灯（中央财政金融学院信息系，北京１０００８１）国家自然科学基金资助项目．１９９２年６月５日收到．１９９３年６月１６日收到修改稿．本文对一类三次系统进行了定性分析，得出系统（１）的极限环的存在性、唯一性及不存在性的条件．定理１...