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En esta contribución, presentamos un resumen de resultados recientes sobre aplicaciones de la teoría de polinomios ortogonales no estándar (en particular, asociados a medidas soportadas en la circunferencia unidad y respecto a productos de Sobolev asociados a vectores de medidas soportados en la recta real). Consideramos transformaciones espectrales de medidas y su tratamiento desde el punto de vista de factorización de matrices. Finalmente, se abordan algunos problemas de teoría de aproximación en espacios de Sobolev.
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