Theorem 1(Abel Theorem) If the power series is convergent at ,then for any that ,the power series absolutely converges at point ;if the power series is divergent at ,then for any that ,the power series diverges at point .
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- 定理1(阿贝尔定理)如果级数当时收敛,则适当不等式的一切使这幂级数绝对收敛;反之,如果级数当时发散,则适合不等式的一切使这幂级数发散。