𝑀-matrices satisfy Newton’s inequalities

Holtz, Olga

doi:10.1090/S0002-9939-04-07576-8

$M$-matrices satisfy Newton’s inequalities
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Proc. Amer. Math. Soc. 133 (2005), 711-717 Request permission

Abstract:

Newton’s inequalities $c_n^2 \ge c_{n-1}c_{n+1}$ are shown to hold for the normalized coefficients $c_n$ of the characteristic polynomial of any $M$- or inverse $M$-matrix. They are derived by establishing first an auxiliary set of inequalities also valid for both of these classes. They are also used to derive some new necessary conditions on the eigenvalues of nonnegative matrices.

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