This is a preview. Log in through your library . Abstract We show that every real nonnegative polynomial f can be approximated as closely as desired (in the l₁-norm of its coefficient vector) by a ...

Hilbert's 17th problem concerns expression of polynomials on Rn as a sum of squares. It is well known that many positive polynomials are not sums of squares; see [Re], [D'A] for excellent surveys. In ...

Quadratic equations are polynomials, meaning strings of math terms. An expression like “x + 4” is a polynomial. They can have ...