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# Approximating Positive Polynomials Using Sums of Squares

Published:2003-09-01
Printed: Sep 2003
• M. Marshall
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## Abstract

The paper considers the relationship between positive polynomials, sums of squares and the multi-dimensional moment problem in the general context of basic closed semi-algebraic sets in real $n$-space. The emphasis is on the non-compact case and on quadratic module representations as opposed to quadratic preordering presentations. The paper clarifies the relationship between known results on the algebraic side and on the functional-analytic side and extends these results in a variety of ways.
 MSC Classifications: 14P10 - Semialgebraic sets and related spaces 44A60 - Moment problems