Re: [分析] 泰勒級數
應該是錯的,考慮下面用f(x)來造反例:
考慮 g(x) = f(x), if x in [-1,1]
f(x-100), if x in [99,101]
(其實就讓f重複出現在其他地方)
剩下的部分用平滑曲線來接,則g€C^∞(|R) and g(0)=0=g(100)
除了x=0,100, 其它點的泰勒展開代值都和原函數值不等,理由跟f一樣
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