幂级数平方根和倒数的快速算法
Faster algorithms for the square root and reciprocal of power series
摘要:
给出了C [[x]]中幂级数的平方根和倒数的新算法。如果M(n)表示乘以n次多项式的成本,则n阶的平方根成本(1.333. + o(1))M(n)和倒数成本(1.444. + o(1))M(n).这些分别改善了以前的最佳结果(1.8333. + o(1))M(n)和(1.5 + o(1))M(n)。
英文摘要:
We give new algorithms for the computation of square roots and reciprocals of power series in C[[x]]. If M(n) denotes the cost of multiplying polynomials of degree n, the square root to order n costs (1.333... + o(1)) M(n) and the reciprocal costs (1.444... + o(1)) M(n). These improve on the previous best results, respectively (1.8333... + o(1)) M(n) and (1.5 + o(1)) M(n).
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