Solving Derivation Problem of Power Exponential Function of N Variables from the Point of View of the Function of Many Variables;
对幂指函数的求导法则做了进一步推广，并给出了相应的求导举例。
Necessary and sufficient conditions are given on the symmetry of points and n-1 dimensional hyperplane of function of many variables in then-dimensional Euclidean space.
在n维欧氏空间内，给出了多元函数分别关于点、n-1维超平面对称的充要条件。
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