Publikation: On the Choi-Lam analogue of Hilbert's 1888 theorem for Symmetric Forms
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2016
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Linear Algebra and its Applications. 2016, 496, pp. 114-120. ISSN 0024-3795. eISSN 1873-1856. Available under: doi: 10.1016/j.laa.2016.01.024
Zusammenfassung
A famous theorem of Hilbert from 1888 states that a positive semidefinite (psd) real form is a sum of squares (sos) of real forms if and only if n=2 or d=1 or (n,2d)=(3,4), where n is the number of variables and 2d the degree of the form. In 1976, Choi and Lam proved the analogue of Hilbert's Theorem for symmetric forms by assuming the existence of psd not sos symmetric n-ary quartics for n≥5. In this paper we complete their proof by constructing explicit psd not sos symmetric n-ary quartics for n≥5.
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Fachgebiet (DDC)
510 Mathematik
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Positive polynomials; Sums of squares; Symmetric forms
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GOEL, Charu, Salma KUHLMANN, Bruce REZNICK, 2016. On the Choi-Lam analogue of Hilbert's 1888 theorem for Symmetric Forms. In: Linear Algebra and its Applications. 2016, 496, pp. 114-120. ISSN 0024-3795. eISSN 1873-1856. Available under: doi: 10.1016/j.laa.2016.01.024BibTex
@article{Goel2016ChoiL-32537,
year={2016},
doi={10.1016/j.laa.2016.01.024},
title={On the Choi-Lam analogue of Hilbert's 1888 theorem for Symmetric Forms},
volume={496},
issn={0024-3795},
journal={Linear Algebra and its Applications},
pages={114--120},
author={Goel, Charu and Kuhlmann, Salma and Reznick, Bruce}
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<dcterms:abstract xml:lang="eng">A famous theorem of Hilbert from 1888 states that a positive semidefinite (psd) real form is a sum of squares (sos) of real forms if and only if n=2 or d=1 or (n,2d)=(3,4), where n is the number of variables and 2d the degree of the form. In 1976, Choi and Lam proved the analogue of Hilbert's Theorem for symmetric forms by assuming the existence of psd not sos symmetric n-ary quartics for n≥5. In this paper we complete their proof by constructing explicit psd not sos symmetric n-ary quartics for n≥5.</dcterms:abstract>
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