01a Articolo in rivista
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The constraints on the coefficients of the characteristic polynomials of four dimensional doubly stochastic matrices with zero trace and Leslie stochastic matrices with zero trace are determined. Then, on the basis of these constraints, the regions of the complex plane consisting of those points...
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The purpose of this paper is to state the correct formulation of a theorem proposed by M. Roitman and Z. Rubinstein on the characterization of linear recursions which imply a linear recursion with nonnegative coefficients. The authors present a counterexample to such a theorem and then state its...
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Food consumption patterns and lifestyles heavily affect the environmental sustainability of food production at least in terms of water consumption and greenhouse gases emission. In this paper, a systematic procedure based on an operation research approach is presented in order to define menus with...
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Some results on the location of the eigenvalues of trace zero doubly stochastic matrices are provided. A result similar to that provided in [H. Perfect and L. Mirsky. Spectral properties of doubly–stochastic matrices. Monatshefte f¨ur Mathematik, 69(1):35–57, 1965.] for doubly stochastic matrices...
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