二元函数可微的一个充分条件

A sufficient condition on diferentiability of binary function

提出了二元函数在某点可微的一个充分条件,与传统的判别方法相比,这个充分条件更加减弱了判别条件,进一步阐明了二元函数偏导数与可微性的关系,使适用范围扩大,适用性加强.

In this paper was given a sufficient condition for differentiability of binary function in some point . Compared to the traditional method,this sufficient condition is easier for us to estimation, and it state further the relation between partially derivative and differentiation of binary function. So this sufficient condition can be applied widely and deeply.