THE COMPLEX OSCILLATION OF NON－HOMOGENEOUS LINEAR DIFFERENTIAL EQUATIONS WITH INFINITE ORDER ENTIRE COEFFICIENTS

ＴＨＥＣＯＭＰＬＥＸＯＳＣＩＬＬＡＴＩＯＮＯＦＮＯＮ－ＨＯＭＯＧＥＮＥＯＵＳＬＩＮＥＡＲＤＩＦＦＥＲＥＮＴＩＡＬＥＱＵＡＴＩＯＮＳＷＩＴＨＩＮＦＩＮＩＴＥＯＲＤＥＲＥＮＴＩＲＥＣＯＥＦＦＩＣＩＥＮＴＳ￥ＬｉＸｉａｎｙｕ（李贤瑜）（ＪｉａｎｇｘｉＮｏｒ...     

THE ZERO AND ORDER OF SOME SECOND ORDER LINEAR DIFFERENTIAL EQUATIONS WITH TRANSCENDENTAL MEROMORPHIC COEFFICIENTS

ＴＨＥＺＥＲＯＡＮＤＯＲＤＥＲＯＦＳＯＭＥＳＥＣＯＮＤＯＲＤＥＲＬＩＮＥＡＲＤＩＦＦＥＲＥＮＴＩＡＬＥＱＵＡＴＩＯＮＳＷＩＴＨＴＲＡＮＳＣＥＮＤＥＮＴＡＬＭＥＲＯＭＯＲＰＨＩＣＣＯＥＦＦＩＣＩＥＮＴＳＣＨＥＮＺＯＮＧＸＵＡＮＡｂｓｔｒａｃｔ：Ｉｎｔｈ...     

OSCILLATION OF HIGHER ORDER NEUTRAL DIFFERENTIAL EQUATIONS WITH POSITIVE AND NEGATIVE COEFFICIENTS

ＯＳＣＩＬＬＡＴＩＯＮＯＦＨＩＧＨＥＲＯＲＤＥＲＮＥＵＴＲＡＬＤＩＦＦＥＲＥＮＴＩＡＬＥＱＵＡＴＩＯＮＳＷＩＴＨＰＯＳＩＴＩＶＥＡＮＤＮＥＧＡＴＩＶＥＣＯＥＦＦＩＣＩＥＮＴＳＬｉＷａｎｔｏｎｇ（李万同）（ＺｈａｎｇｙｅＴｅａｃｈｅｒｓ＇Ｃｏｌｌｅｇｅ...     

ON OSCILLATION THEOREMS. FOR HIGHER ORDER DIFFERENTIAL EQUATIONS

In this paper,we investigate the complex oscillation of the differential equation f^(k) Ak-1f^(k-1)… A1f^1 A0f=F(x) where Af(j=0,…,k-1)F 0 are finite order entire functions. And we give precise estimates of the exponent of convergence of the zero-sequence of solutions for the above equation under some additional hypotheses.     

A NOTE ON THE COMPLEX OSCILLATION OF NONHOMOGENEOUS LINEAR DIFFERENTIAL EQUATIONS WITH TRANSCENDENTAL ENTIRE COEFFICIENTS

ＡＮＯＴＥＯＮＴＨＥＣＯＭＰＬＥＸＯＳＣＩＬＬＡＴＩＯＮＯＦＮＯＮＨＯＭＯＧＥＮＥＯＵＳＬＩＮＥＡＲＤＩＦＦＥＲＥＮＴＩＡＬＥＱＵＡＴＩＯＮＳＷＩＴＨＴＲＡＮＳＣＥＮＤＥＮＴＡＬＥＮＴＩＲＥＣＯＥＦＦＩＣＩＥＮＴＳＧａｏＳｈｉａｎ；＆ＷａｎｇＳｈｅｎ...     

A NOTE ON THE COMPLEX OSCILLATION FOR HIGHER ORDER HOMOGENEOUS LINEAR DIFFERENTIAL EQUATIONS

ＡＮＯＴＥＯＮＴＨＥＣＯＭＰＬＥＸＯＳＣＩＬＬＡＴＩＯＮＦＯＲＨＩＧＨＥＲＯＲＤＥＲＨＯＭＯＧＥＮＥＯＵＳＬＩＮＥＡＲＤＩＦＦＥＲＥＮＴＩＡＬＥＱＵＡＴＩＯＮＳＧａｏＳｈｉａｎ（高仕安）＆ＴａｎｇＪｉａｆｅｎｇ（汤家凤）（ＳｏｕｔｈＣｈｉｎａＮｏｒｍ...     

PERTURBATION RESULTS OF SECOND ORDER LINEAR DIFFERENTIAL EQUATIONS WITH PERIODIC COEFFICIENTS

Two perturbation results on the linear differential function f" ∏(z)A(z)f = 0 areobtained, where ∏(z) and A(z) are periodic entire functions with period 2πi and σe(∏) ＜σe(A).     

OSCILLATION AND ASYMPTOTIC BEHAVIOR OF HIGHER ORDER NEUTRAL EQUATIONS WITH VARIABLE COEFFICIENTS

The authors establish sufficient conditions for the oscillation of all solution of neutral deiay differential equations of even and odd order of the formd~n/dt~n[y(t)+p(t)y(t-τ)]+Q(t)y(t-C)=0, t≥t_n,where P, Q ∈ C[[t_0, ∞), R], τ, σ∈ R~+ and n≥1.     

OSCILLATION THEOREMS FOR SECOND ORDER NONLINEAR DIFFERENTIAL EQUATIONS WITH DAMPING

Some new oscillation theorems are established for the second order nonlinear differential equations with damping of the form where p(t) and q(t) are allowed to change sign on [t_0,∞).     

ON THE ITERATED ORDER OF MEROMORPHIC SOLUTIONS OF HIGHER ORDER LINEAR DIFFERENTIAL EQUATIONS

In this paper, we investigate complex homogeneous and non-homogeneous higher order linear differential equations with meromorphic coefficients. We obtain several results concerning the iterated order of meromorphic solutions, and the iterated convergence exponent of the zeros of meromorphic solutions.     

ZEROS OF SOLUTIONS OF HIGHER ORDER LINEAR DIFFERENTIAL EQUATIONS

1 Introduction and ResultsWe assume that the reader is familiar with the standard notation of Nevanlinna Theory. We use also the symbols u(f) to denote the order of ameromorphic function f, and A(f) to denote the exponent of convergence tothe zero-sequence of f.K.Ishizaki and K.TOhge studied the equationwhere pla pZ are non-constant polynomials:and Q(z) is an entire function of order less than max{n, "z}. They assumedthat cul and epZ are linearly independent and obtained in [5].Theorem A…     

几类高阶微分方程解的复振荡

本文研究了几类高阶线性微分方程解的增长性,零点,以及构成基础解的一组线形无关解的乘积的增长性.得到了5个定理,推广了陈宗煊,S.Bank和J.Langley给出的结果.     

复域高阶线性微分方程解的某些振荡结果

本文研究了线性微分方程解的增长性.运用值分布理论,得到方程解的增长的精确估计.进一步,讨论了上述方程解以及解的一阶,二阶导数与小函数的关系.     

关于高阶线性微分方程解的零点

本文研究了k(≥2)阶齐次线性微分方程(其中P1(z)=ξ1zn+…,P2(z)=ξ2zn+…为非常数多项式.Q1(z)(≠0),Q2(z)(≠0),Q(z),aj(z)(j=1,2,…,k一1)均为级小于n的整函数)的非平凡解f的复振荡问题,得出当ξ2-ξ1为正实数时,方程解的零点序列收敛指数的一些结果.     

一类高阶齐次线性微分方程解的零点

本文研究一类整函数系数高阶齐次线性微分方程解的零点分布.利用Nevanlinna值分布理论,得到当系数A_(k-1)的增长性起主要支配作用时,方程f~((k))+A_(k-1)f~((k-1))+···+A_0f=0任意超越解的零点收敛指数为无穷,推广了Langley和Bank等人的结果.