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第一百二十九章 麦克劳林级数(级数)(1 / 2)

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作为牛顿看好的学生,麦克劳林经常思考一个问题。

世间很多物理运动,是不是都可以由已知函数表达,如果是已知的,那会是什么样的函数。

天下所有函数是不是都可以展开成多项式形式,这个多项式前有对应合理系数?

也许是可以的,即使不是准确了,但大概也可以展开成这样。

麦克劳林一开始去研究多项式函数的形状,自己也绘制了很多个函数。

麦克劳林开始发现,只要多项式前的系数可以直接决定。

理论上就是改变多项式系数,就可以合成,或者近似合成几乎任何一个函数。这不是一个理论,而是实际需要的东西。

但比较麻烦的是,每次的合成比较麻烦,需要反复验证,才能吻合。

后来泰勒发现泰勒级数之后,麦克劳林看到了这种简单的方法。

麦克劳林级数是函数在x=0处的泰勒级数,它是牛顿的学生麦克劳林于1742年给出的,用来证明局部极值的充分条件,他自己说明这是泰勒级数的特例,但后人却加了麦克劳林级数这个名称。

麦克劳林最后还是落下一个毛病,他还是没有用泰勒级数,他还是习惯于自己对多项式改变系数,来研究很多函数的性质,同时可以研究清很多运动轨迹。

牛顿对麦克老林说:“不可避免,我们要研究级数了,这是未来的趋势。”

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