Alfaro, ManuelLópez Lagomasino, GuillermoRezola, M. Luisa2010-01-132010-01-131996-04-30Journal of Computational and Applied Mathematics, 1998, vol. 69, n. 1, p. 171-1790377-0427http://hdl.handle.net/10016/63729 pages, no figures.-- MSC1991 code: 33C45.MR#: MR1391618 (97f:33008)Zbl#: Zbl 0862.33005For polynomials orthogonal with respect to a discrete Sobolev product, we prove that, for each n, Qn has at least n − m zeros on the convex hull of the support of the measure, where m denotes the number of terms in the discrete part. Interlacing properties of zeros are also described.application/pdfeng© ElsevierOrthogonal and quasi-orthogonal polynomialsSobolev-type productsGauss-Jacobi quadrature formulaZerosresearch articleMatemáticas10.1016/0377-0427(95)00034-8open access