二元函数柯西中值定理的一个注记

A NOTE ON THE CAUCHY MEAN VALUE THEOREM OF TWO-VARIABLE FUNCTIONS

给出了二元函数柯西中值定理的“中间点”，当点B（X0＋△X，yo＋△y）沿直线段AB向点A（xo，yo）逼近时的渐近性质。

By discussing the asymptoticality of the 'medial pont'in the Cauchy mean value theorem of two-variable functions when point B (x0 ＋△x, y0 ＋△y) approales point A (x0, y0 ) along line segment AB, theasymptotic estimation formulas are obtained under weaker conditions