Essentially optimal computation of the inverse of generic polynomial matrices

  • Authors:
  • Claude-Pierre Jeannerod;Gilles Villard

  • Affiliations:
  • CNRS, INRIA, Laboratoire LIP, École Normale Supérieure de Lyon, 46, Allée d'Italie 69364 Lyon Cedex 07, France;CNRS, INRIA, Laboratoire LIP, École Normale Supérieure de Lyon, 46, Allée d'Italie 69364 Lyon Cedex 07, France

  • Venue:
  • Journal of Complexity - Special issue: Foundations of computational mathematics 2002 workshops
  • Year:
  • 2005

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Abstract

We present an inversion algorithm for nonsingular n × n matrices whose entries are degree d polynomials over a field. The algorithm is deterministic and, when n is a power of two, requires O ∼ (n3d) field operations for a generic input; the soft-O notation O∼ indicates some missing log(nd) factors. Up to such logarithmic factors, this asymptotic complexity is of the same order as the number of distinct field elements necessary to represent the inverse matrix.