Hessenberg-Sobolev Matrices and Favard type theorems

Hector Pijeira-Cabrera, Laura Decalo-Salgado, Ignacio Perez-Yzquierdo

We study the relation between certain non-degenerate lower Hessenberg infinite matrices $\mathcal{G}$ and the existence of sequences of orthogonal polynomials with respect to Sobol…