Ceylon 包含称为一阶函数 的函数式编码样式。

Ceylon includes the functional style of programming called first-order functions.

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这意味着如果x变化,函数值不会发生一阶变化。

That means when I vary x the first order the function doesn't change.

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本文试应用求解一阶线性微分方程的方法导出几类常见的函数项级数的求和公式。

The sum formulas of several kinds of ordinary series with function term are deduced by using the method of solving linear differential equation.

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Then, to find the meaning of b, we take one derivative of this, dx/dt, that's velocity as a function of time, and if you took the derivative of this guy, you will find as at+b. That's the velocity of the object.

接下来,为了弄清b的含义,我们取它的一阶导数,dx/dt,得到速度作为时间的函数,如果你对它求导的话,你会得到at+b,这就是物体的速度

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