Algebras of specific types of operators Double concentration Matrix valued orthogonal polynomials Orthogonal functions and polynomials Pesos matriciales Time-band limiting Álgebra de operadores diferenciales Bimodules in associative algebras Matrix orthogonal polynomials Polinomios matriciales ortogonales Problema matricial de Bochner Transformación biespectral de Darboux Ad conditions Application of orthogonal and other special functions Biespectralidad Eigenfunctions, eigenfunction expansions, completeness of eigenfunctions of ordinary differential operators Finite groups Funciones esféricas Funciones especiales Funciones ortogonales y polinomios Grupos finitos Harmonic analysis on euclidean spaces Matrix Differential Operators Matrix valued spherical functions Operators Algebra Orthogonal polynomials Orthogonal polynomials and functions of hypergeometric type Polinomios ortogonales Polinomios ortogonales matriciales Representation theory