Bit-size estimates for triangular sets in positive dimension

  • Authors:
  • Xavier Dahan;Abdulilah Kadri;íric Schost

  • Affiliations:
  • Faculty of Mathematics, Kyíshí University, Japan;Mathematics Department, The University of Western Ontario, Canada;Computer Science Department, The University of Western Ontario, Canada

  • Venue:
  • Journal of Complexity
  • Year:
  • 2012

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Abstract

We give bit-size estimates for the coefficients appearing in triangular sets describing positive-dimensional algebraic sets defined over Q. These estimates are worst case upper bounds; they depend only on the degree and height of the underlying algebraic sets. We illustrate the use of these results in the context of a modular algorithm. This extends the results by the first and the last author, which were confined to the case of dimension 0. Our strategy is to get back to dimension 0 by evaluation and interpolation techniques. Even though the main tool (height theory) remains the same, new difficulties arise to control the growth of the coefficients during the interpolation process.