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• W3087887336 abstract "This paper starts by recalling the author’s results on polynomial approximation over a Cartesian product A of closed unbounded intervals and its applications to solving Markov moment problems. Under natural assumptions, the existence and uniqueness of the solution are deduced. The characterization of the existence of the solution is formulated by two inequalities, one of which involves only quadratic forms. This is the first aim of this work. Characterizing the positivity of a bounded linear operator only by means of quadratic forms is the second aim. From the latter point of view, one solves completely the difficulty arising from the fact that there exist nonnegative polynomials on ℝn, n≥2, which are not sums of squares." @default.
• W3087887336 created "2020-10-01" @default.
• W3087887336 creator A5032816815 @default.
• W3087887336 date "2020-09-25" @default.
• W3087887336 modified "2023-09-27" @default.
• W3087887336 title "Polynomial Approximation on Unbounded Subsets, Markov Moment Problem and Other Applications" @default.
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• W3087887336 doi "https://doi.org/10.3390/math8101654" @default.
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