complex power series
...复数幂级数； 关键词 [gap=180]Key words: Euler's formula; limit method; an exponential function integral method; complex power series ; ...
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当指定Z为复数变元时，就有了形式幂级数的“变换”函数，即闭合形式的问题。
When Z is assigned the meaning of a complex variable, problem of "closed form" of formal power series emerges.
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