设为一幂级数,其收敛半径为R。若对收敛圆(模长为 R 的复数的集合)上的某个复数,级数收敛,则有: 。
若收敛,则结果显然成立,无须引用这定理。
英语百科
Abel's theorem 阿贝尔定理
(重定向自Abel theorem)
In mathematics, Abel's theorem for power series relates a limit of a power series to the sum of its coefficients. It is named after Norwegian mathematician Niels Henrik Abel.