Acceleration of the inversion of triangular Toeplitz matrices and polynomial division

  • Authors:
  • Brian J. Murphy

  • Affiliations:
  • Department of Mathematics and Computer Science, Lehman College of the City University of New York, Bronx, NY

  • Venue:
  • CASC'11 Proceedings of the 13th international conference on Computer algebra in scientific computing
  • Year:
  • 2011

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Abstract

Computing the reciprocal of a polynomial in z modulo a power zn is well known to be closely linked to polynomial division and equivalent to the inversion of an n × n triangular Toeplitz matrix. The degree k of the polynomial is precisely the bandwidth of the matrix, and so the matrix is banded iff k ≪ n. We employ the above equivalence and some elementary but novel and nontrivial techniques to obtain minor yet noticeable acceleration of the solution of the cited fundamental computational problems.