On the boolean complexity of real root refinement

  • Authors:
  • Victor Y. Pan;Elias P. Tsigaridas

  • Affiliations:
  • City University of New York, Bronx, New York, NY, USA;INRIA, Paris-Rocquencourt Center, PolSys Project, UPMC, Univ Paris 06, LIP6, CNRS, UMR 7606, LIP6, Paris, France

  • Venue:
  • Proceedings of the 38th international symposium on International symposium on symbolic and algebraic computation
  • Year:
  • 2013

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Abstract

We assume that a real square-free polynomial A has a degree d, a maximum coefficient bitsize τ and a real root lying in an isolating interval and having no nonreal roots nearby (we quantify this assumption). Then, we combine the Double Exponential Sieve algorithm (also called the Bisection of the Exponents), the bisection, and Newton iteration to decrease the width of this inclusion interval by a factor of t=2-L. The algorithm has Boolean complexity ÕB(d2 τ + d L ). Our algorithms support the same complexity bound for the refinement of r roots, for any r ≤ d.