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
的和
收敛域内可以逐项微
的公式；并得到了计算
立叶系的一种简便方法.
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的和收敛域内可以逐项微的公式；并得到了计算立叶系的一种简便方法.
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