3 papers
math.AG2025
Characterization of polynomial surfaces of revolution and polynomial quadrics
Michal Bizzarri, Miroslav Lávička, J. Rafael Sendra +1
In this paper, we characterize the polynomiality of surfaces of revolution by means of the polynomiality of an associated plane curve. In addition, if the surface of revolution is…
math.GM2023
Eigenvalues of Real Matrices with Prescribed Principal Minors Sign and Descartes Law of Signs
Laureano González-Vega, J. Rafael Sendra, Juana Sendra
In this paper, using Descartes law of sign, we provide elementary proof of results on the number of real eigenvalues of real matrices of which certain properties on the signs of th…
math.AG2014
Missing sets in rational parametrizations of surfaces of revolution
J. Rafael Sendra, David Sevilla, Carlos Villarino
Parametric representations do not cover, in general, the whole geometric object that they parametrize. This can be a problem in practical applications. In this paper we analyze the…