... 收敛区间：convergence interval 收敛判别法：Convergence Criterion 收敛幂级数：convergent power series ...
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它们有相同的收敛区间，应用代入法求出它们的级数和，从而获得孪生组合恒等式。
Because they have same convergence region, sum of series and combinational twin identifies was obtained using the method of substitution.
通过对阿贝尔定理的深入探讨，获得了幕级数在其收敛区间端点收敛的一些判别条件。
We obtain a sufficient condition and a essential - sufficient condition about convergence at the end point of the convergence interval of power series.
完全可以使用计算机对柯氏公式进行迭代求解，但首先必须解决迭代计算的收敛区间问题，这个问题目前尚无明确的结论。
At present, computer can be used to iteratively solving Colebrook's formula, but first the problem about the convergence interval of iterative calculation must be solved.
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