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arXiv · 2508.20607

Refined bit complexity for the computation of at least one point per connected component of a smooth complete intersection real algebraic set

Jesse Elliott·Mark Giesbrecht·Edern Gillot·Mohab Safey El Din·Éric Schost
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Abstract

We refine the bit complexity analysis of an algorithm for the computation of at least one point per connected component of a smooth real algebraic set, yielding exponential speedup (with respect to the number of variables) compared to prior works. The algorithm which is analyzed is based on the critical point method, reducing the problem to computations of critical points associated to the restriction of generic projections on lines to the studied variety. Our refinement, and the subsequent improved complexity statement, comes from a better utilization of the multi-affine structure of polynomial systems encoding these sets of critical points. The bit-size estimates on the size of the output produced by this algorithm are also improved by this refinement.

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Jesse Elliott, Mark Giesbrecht, Edern Gillot, Mohab Safey El Din, Éric Schost. 2025-08-28. Refined bit complexity for the computation of at least one point per connected component of a smooth complete intersection real algebraic set. https://arxiv.org/abs/2508.20607

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