An Example of a Positive Polynomial whic
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Konrad SchmΓΌdgen
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Article
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1979
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John Wiley and Sons
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English
β 187 KB
In 1888 D. HILBERT showed the existence of a real polynomial in two variables of sixth degree which is non-negative on the real plane without being a finite sum of squares of polynomials ([2]; see e.g. [l]). The existence of such polynomials has important consequences in the theory of unbounded oper