In this paper it is proved that there exist neither right triangles nor isosceles triangles with integer sides and medians by the method of descending.

本文用逐步递降法的思想证明了不存在边长和中线都是整数的直角三角形和等腰三角形。

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Based on the sensitivity of neural network of system identification, a method of descending neural network sensitivity in control systems is proposed in this paper.

基于系统辨识的神经网络灵敏度，提出了降低用于控制系统中神经网络灵敏度的一种方法。

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By means of the method of descending dimension for establishing inequalities(see theorem 1 and its corollaries), This paper proves a class of inequalities for symmetric functions.

利用建立不等式的降维法，证明了一组对称函数的不等式。

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