Positive solution of singular initial value problem of a second order equation 一個二階奇異初值問題的正解
The general solution of a kind second order equation is given 摘要給出一類二階變系數(shù)線性微分方程的通解。
The cauchy problem for a hyperbolic equation of second order equation with data on the parabolic line 取值在拋物線上的雙曲型微分方程的柯西問題
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 而這類方程的特征形式在所研究的區(qū)域上是變號的,即在有的子區(qū)域上非負(fù),而在其余的子區(qū)域上非正。