【摘要】 从代数、几何、分析等几个方面论述了二元函数的可微、一致弱可微及其所表示的曲面在相应点处存在非铅垂切平面之间的关系 ,得到了它们之间的等价性定理更多还原

【Abstract】 In this paper,we discussed relationships among the differentialbility and uniform weak differentialbility of bivarible functions and non vertical tangent plane of curved surfaces related the function,and obtained a thorem of the equivelance among the functions and planes.更多还原