In this paper, symmetric derivative and symmetric partial derivative are researched and some new differential mean value theorems are defined.
针对对称导数、对称偏导数，给出了一些新形式的微分中值定理。
The criterion extreme value of binary function for first partial derivative is given by means of the mean value theorem. The two theorems are obtained.
以中值定理为工具，给出了利用一阶偏导数判定二元函数极值的方法。
Basing on a partition of region d, we generalize the differential mean-value theorems for analytic functions and conjugate analytic functions to a high order case.
以分割区域d为基础将解析函数与共轭解析函数的微分中值定理推广到高阶形式。
This paper, proves that there is at least one interior point satisfying the mean-value theorems, and points out an erroneous proof.
本文以多种方法证明了至少有一个内点满足这些中值定理。另外，指出了一种错误的证法。
This paper, proves that there is at least one interior point satisfying the mean-value theorems, and points out an erroneous proof.
本文以多种方法证明了至少有一个内点满足这些中值定理。另外，指出了一种错误的证法。
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