变号的的英文

例句与用法

1. Is allowed to oscillates and the condition
   - 1可以是变号的，并且不要求
2. Positive solutions of a semilinear elliptic equation with coefficient that changes sign
   系数变号的半线性椭圆方程的正解
3. 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。