Abstract
Let \(\{\mathbb{P}_{n}\}_{n\ge 0}\) and \(\{\mathbb{Q}_{n}\}_{n\ge 0}\) be two monic polynomial systems in several variables satisfying the linear structure relation \(\mathbb{Q}_{n} = \mathbb{P}_{n} + M_{n} \mathbb{P}_{n-1}, \quad n\ge 1,\)where M n are constant matrices of proper size and \(\mathbb{Q}_{0} = \mathbb{P}_{0}\). The aim of our work is twofold. First, if both polynomial systems are orthogonal, characterize when that linear structure relation exists in terms of their moment functionals. Second, if one of the two polynomial systems is orthogonal, study when the other one is also orthogonal. Finally, some illustrative examples are presented.
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Manuel Alfaro, Ana Peña, M. Luisa Rezola were partially supported by MEC of Spain under Grant MTM2012–36732–C03–02 and Diputación General de Aragón project E–64.
Teresa E. Pérez was partially supported by MICINN of Spain and by the European Regional Development Fund (ERDF) through the grant MTM2011–28952–C02–02, and Junta de Andalucía FQM–0229, P09–FQM–4643 and P11-FQM-7276.
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Alfaro, M., Peña, A., Pérez, T.E. et al. On linearly related orthogonal polynomials in several variables. Numer Algor 66, 525–553 (2014). https://doi.org/10.1007/s11075-013-9747-2
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DOI: https://doi.org/10.1007/s11075-013-9747-2