First of all, a function set is defined, in which the derivative of the elements can be linearly represented by the elements;

首先，定义了一个函数类的集合，该集合中元素的导数可以由该集合中的元素线性表出；

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Using a compressibility coordinate transformation, a set of the first derivative differential equations has been derived.

采用了压缩性的坐标变换后，推导得到了五个一阶导数的微分方程组。

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The original spectrum is processed by using first derivative, and applying Partial Least-Squares method to set up linear mathematical model.

采用一阶导数方法对光谱进行预处理；利用偏最小二乘法建立模型。

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So I differentiated this object, this is my first derivative and I set it equal to 0 Now in a second I'm going to work with that, but I want to make sure i'm going to find a maximum and not a minimum, so how do I make sure I'm finding a maximum and not a minimum?

这样我就对它求出导数了,这是一阶导数,令它等于0,一会我们就要计算了,但我先确定一下是最大值还是最小值,我怎么确定是最大值还是最小值呢

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