【摘要】 讨论如何正确使用Math.的图形功能,对微积分中二元函数在一点极限不存在的情形及二元函数在点不连续但偏导数存在的情形给出几何解释。更多还原

【Abstract】 By means of the graphic function of Mathematica, this article discus how to give the correctly geometric explanation of the unexisting limit of a bivariate function at a point and the existing partial derivative of an uncontinuous bivariate function at a point.更多还原