幂级数 [数] power series ; power r series

形式幂级数 Formal Power Series

幂级数展开 [数] power series expansion ; development in power series ; series

降幂级数 series of decreasing powers

幂级数环 [数] power series ring ; the ring of power series ; formal series rings

形式幂级数环 [数] ring of formal power series ; [数] formal power series ring

幂级数法 power series method ; method of power series

矩阵幂级数 [数] matrix power series

渐近幂级数 [数] asymptotic power series

收敛幂级数 [数] convergent power series