Abstract
Consider the optimization problem \(p_{\min , Q} := \min _{\mathbf {x} \in Q} p(\mathbf {x})\), where \(p\) is a degree \(m\) multivariate polynomial and \(Q := [0, 1]^n\) is the hypercube. We provide explicit degree and error bounds for the sums of squares approximations of \(p_{\min , Q}\) corresponding to the Positivstellensatz of Putinar. Our approach uses Bernstein multivariate approximation of polynomials, following the methodology of De Klerk and Laurent to provide error bounds for Schmüdgen type positivity certificates over the hypercube. We give new bounds for Putinar type representations by relating the quadratic module and the preordering associated with the polynomials \(g_i := x_i (1 - x_i), \, i=1,\dots ,n\), describing the hypercube \(Q\).
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Acknowledgments
The author was partly supported by an award of the Simone and Cino del Duca foundation of Institut de France. The author is indebted to Monique Laurent for helpful discussions about relating \(M_r(\mathbf {g})\) and \(T_r(\mathbf {g})\). The author would also like to thank the two anonymous referees for their detailed comments and suggestions to improve this paper.
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Magron, V. Error bounds for polynomial optimization over the hypercube using putinar type representations. Optim Lett 9, 887–895 (2015). https://doi.org/10.1007/s11590-014-0797-8
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DOI: https://doi.org/10.1007/s11590-014-0797-8