Properties of the cone of polynomials of fixed degree that preserve nonnegative matrices

Jared J. L. Brannan, Benjamin J. Clark, Garrett J. Kepler

As was detailed by Loewy and London in [Linear and Multilinear Algebra 6 (1978/79), no.~1, 83--90], the cone of polynomials that preserve the nonnegativity of matrices may play an…