本文考虑二阶非线性椭圆型偏微分方程解的振动性质，得到了在具有“弱积分小”系数条件下，所有解均振动的充分准则，这些结果在很大程度上改进和推广了具有“积分小”系数的二阶常微分方程的振动结果．

In this paper, we consider the following second order nonlinear elliptic partial differential euqations with a "weakly integrally small" coefficient We obtain sufficient conditions for all solutions of (1) to be oscillatory. Particularly, these r