It is also a sufficient condition for second order linear differential equation with varied coefficient to be integrable.
对于二阶变系数线性微分方程来说，这也是可积的一个充分条件。
A linear integral invariant, a universal integral invariant and an absolute integral invariant of second order of the system are obtained under the given condition.
给出系统存在积分不变量的条件，在此条件下导出系统的线性积分不变量、通用积分不变量和二阶绝对积分不变量。
The second order effect can be neglected in our current code if the ratio of stiffness to weight satisfies certain condition when referring to the reinforced concrete frame.
在我国现有规范中，当钢筋混凝土框架的刚重比满足一定条件时，可以不考虑二阶效应的影响。
In this paper, We prove that the orthogonal condition to solve the uniform asymptotic solution of second order linear P. D. E in periodic region is the necessary and sufficient condition.
本文证明了求解周期区域上的二阶线性偏微分方程的一致有效渐近解的正交条件是充分和必要的。
Then, the latter necessary and sufficient condition is generalized to the case for the two different point ranges of degenerate second order curve.
然后，再将非退化二阶曲线到自身的双射为对合的充要条件推广到退化二阶曲线两相异点列的情形。
Additionally, a mathematical manipulation is adopted to remove the second-order spacial derivatives in the body surface boundary condition.
对二阶物面边界条件采用数学手段，推导出一个没有二阶空间导数的表达式，以便于计算。
This paper reviewed the synthesis, function and current condition of second- order nonlinear optical polyimide material in recent years, and then analyzed its application prospect.
综述了近年来二阶非线性光学聚酰亚胺材料的合成、性能和现状，并对其应用前景进行了展望。
This paper aims at studying the boundary value for second order quasilinear elliptic equations with nonlinear boundary condition in exterior domain.
研究在外部区域中拟线性椭圆型方程，具有非线性边界条件的边值问题。
A sufficient condition is obtained for a class of second order operator matrices to generate C0 semigroups.
给出了一类二阶算子矩阵生成C0半群的一个充分条件，并应用此条件证明了一类具体的二阶算子矩阵可生成C0半群。
Second-order cumulative waves have been fully determined by applying the boundary condition of second-order stress.
根据二阶应力边界条件，确定出了固体板内的二阶积累波。
We obtain the existence of the solution of the second order boundary value problem and the asymptotic estimation by some hypothetic condition.
证明了第二边值问题摄动解的存在，并给出了渐近估计式。
Solvability of a second order multi-point boundary value problem with generalized Sturm-Liouville boundary condition;
得到了一类离散多点边值问题的正解的存在性定理。
Solvability of a second order multi-point boundary value problem with generalized Sturm-Liouville boundary condition;
得到了一类离散多点边值问题的正解的存在性定理。
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