Lower bounds for decision problems in imaginary, norm-Euclidean quadratic integer rings

  • Authors:
  • J. Busch

  • Affiliations:
  • The Archer School for Girls, Mathematics Department, 11725 Sunset Boulevard, Los Angeles, CA 90049, USA

  • Venue:
  • Journal of Symbolic Computation
  • Year:
  • 2009

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Abstract

We prove lower bounds for the complexity of deciding several relations in imaginary, norm-Euclidean quadratic integer rings, where computations are assumed to be relative to a basis of piecewise-linear operations. In particular, we establish lower bounds for deciding coprimality in these rings, which yield lower bounds for gcd computations. In each imaginary, norm-Euclidean quadratic integer ring, a known binary-like gcd algorithm has complexity that is quadratic in our lower bound.