We investigate the characteristic boundary value problems for first and second order complex hyperbolic equations. 讨论了一阶和二阶(SO)双曲复方程的特征边值问题。
This paper is devoted to study the oscillation of second order nonlinear differential equations with impulses. 对二阶(SO)非线性脉冲微分方程的振动性给出了充分判据。
In this paper a new oscillation criterion for second order nonlinear differential equations was established. 本文给出了二阶(SO)非线性微分方程的一个新的振动准则。
The Existence of viscosity solutions of initial problem is proved for second order parabolic equations under certain conditions. 证明了在一定条件下二阶(SO)抛物型方程的初值问题的粘性解的存在性。
This paper studies the existence of periodic solutions for some non-autonomous second order systems. 研究一类非自治二阶(SO)系统周期解的存在性问题。