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Computing Real Radicals by Moment Optimization

Published: 18 July 2021 Publication History

Abstract

We present a new algorithm for computing the real radical of an ideal I and, more generally, the S-radical of I, which is based on convex moment optimization. A truncated positive generic linear functional σ vanishing on the generators of I is computed solving a Moment Optimization Problem (MOP). We show that, for a large enough degree of truncation, the annihilator of σ generates the real radical of I. We give an effective, general stopping criterion on the degree to detect when the prime ideals lying over the annihilator are real and compute the real radical as the intersection of real prime ideals lying over I.
The method involves several ingredients, that exploit the properties of generic positive moment sequences. A new efficient algorithm is proposed to compute a graded basis of the annihilator of a truncated positive linear functional. We propose a new algorithm to check that an irreducible decomposition of an algebraic variety is real, using a generic real projection to reduce to the hypersurface case. There we apply the Sign Changing Criterion, effectively performed with an exact MOP. Finally we illustrate our approach in some examples.

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  • (2023)Polynomial Equations: Theory and PracticePolynomial Optimization, Moments, and Applications10.1007/978-3-031-38659-6_8(235-261)Online publication date: 28-Dec-2023

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cover image ACM Conferences
ISSAC '21: Proceedings of the 2021 International Symposium on Symbolic and Algebraic Computation
July 2021
379 pages
ISBN:9781450383820
DOI:10.1145/3452143
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Publication History

Published: 18 July 2021

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Author Tags

  1. convex optimization
  2. moments
  3. numerical algorithm
  4. orthogonal polynomials
  5. positive polynomial
  6. real radical

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  • Research-article

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ISSAC '21
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ISSAC '21: International Symposium on Symbolic and Algebraic Computation
July 18 - 23, 2021
Virtual Event, Russian Federation

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  • (2023)Polynomial Equations: Theory and PracticePolynomial Optimization, Moments, and Applications10.1007/978-3-031-38659-6_8(235-261)Online publication date: 28-Dec-2023

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