Ad conditions 1 Algebras of specific types of operators 1 Application of orthogonal and other special functions 1 Biespectralidad 1 Eigenfunctions, eigenfunction expansions, completeness of eigenfunctions of ordinary differential operators 1 Funciones especiales 1 Funciones ortogonales y polinomios 1 Harmonic analysis on euclidean spaces Orthogonal functions and polynomials 1 Orthogonal polynomials and functions of hypergeometric type 1 Pesos matriciales 1 Polinomios ortogonales matriciales 1 Special functions 1 Time band limiting 1 Álgebra de operadores diferenciales 1