Computer Algebra in Scientific Computing

Volume 6885 of the series Lecture Notes in Computer Science pp 200-214

Practical Divide-and-Conquer Algorithms for Polynomial Arithmetic

  • William HartAffiliated withMathematics Institute, University of Warwick
  • , Andrew NovocinAffiliated withLIP/INRIA/ENS

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We investigate two practical divide-and-conquer style algorithms for univariate polynomial arithmetic. First we revisit an algorithm originally described by Brent and Kung for composition of power series, showing that it can be applied practically to composition of polynomials in ℤ[x] given in the standard monomial basis. We offer a complexity analysis, showing that it is asymptotically fast, avoiding coefficient explosion in ℤ[x]. Secondly we provide an improvement to Mulders’ polynomial division algorithm. We show that it is particularly efficient compared with the multimodular algorithm. The algorithms are straightforward to implement and available in the open source FLINT C library. We offer a practical comparison of our implementations with various computer algebra systems.