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arXiv : 0905.4161

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Pure states, nonnegative polynomials and sums of squares

Sabine Burgdorf 1, 2, Claus Scheiderer, Markus Schweighofer 1

(26/05/2009)

In recent years, much work has been devoted to a systematic study of polynomial identities certifying strict or non-strict positivity of a polynomial on a basic closed semialgebraic set. The interest in such identities originates not least from their importance in polynomial optimization. The majority of the important results requires the archimedean condition, which implies that the semialgebraic set has to be compact. This paper introduces the technique of pure states into commutative algebra. We show that this technique allows an approach to most of the recent archimedean Stellensaetze that is considerably easier and more conceptual than the previous proofs. In particular, we reprove and strengthen some of the most important results from the last years. In addition, we establish several such results which are entirely new. They are the first that allow the polynomial to have arbitrary, not necessarily discrete, zeros on the semialgebraic set.

1 :	Institut de Recherche Mathématique de Rennes (IRMAR)
	CNRS : UMR6625 – Université de Rennes 1 – École normale supérieure de Cachan - ENS Cachan – Institut National des Sciences Appliquées (INSA) : - RENNES – Université de Rennes II - Haute Bretagne
2 :	Fachbereich Mathematik und Statistik
	Universität Konstanz

Domaine

:

Mathématiques/Algèbre commutative

Mots Clés : algèbre commutative

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Contributeur : Marie-Annick Guillemer <>

Soumis le : Lundi 27 Juin 2011, 17:00:44

Dernière modification le : Lundi 27 Juin 2011, 17:00:44