... termwise differentiable 逐项可微的 termwise differentiation 逐项微分（法） termwise integrable series 逐项可积级数 ...
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A relatively direct method is expounded in this paper to prove the termwise differentiation of power series, and a simple method is expressed to calculate the Fourier coefficient.
用比较直接的方法证明幂级数的和函数在收敛域内可以逐项微分的公式；并得到了计算傅立叶系数的一种简便方法。
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