second order equation meaning in Chinese

二阶方程

Positive solution of singular initial value problem of a second order equation
一个二阶奇异初值问题的正解
The general solution of a kind second order equation is given
摘要给出一类二阶变系数线性微分方程的通解。
The cauchy problem for a hyperbolic equation of second order equation with data on the parabolic line
取值在抛物线上的双曲型微分方程的柯西问题
The study of degenerate elliptic equations can be traced back to 1910 ' s , first appeared in picone ' s thesis . after half century ' s development in this field , o . a . oleinik and e . v . radkeic , published their classic monograph second order equations with nonnegative characteristic form in 1971
而这类方程的特征形式在所研究的区域上是变号的，即在有的子区域上非负，而在其余的子区域上非正。