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ORTHOGONAL POLYNOMIALS 107
, Sur la suite de polynˆomes orthogonaux associ´ee a` la forme u = δc + λ(x − c)−1L, Period. Math. Hungar. 21 (1990), no. 3, 223-248.
, Une th´eorie alg´ebrique des polynˆomes orthogonaux. Applications aux polynoˆmes orthogonaux semiclassiques, Orthogonal polynomials and their applications (Erice, 1990), 95-130, IMACS Ann. Comput. Appl. Math., 9, Baltzer, Basel, 1991.
, Variations around classical orthogonal polynomials. Connected problems, J. Comput. Appl. Math. 48 (1993), 133-155.
J. Petronilho, On the linear functionals associated to linearly related sequences of orthogonal polynomials (in preparation).
M. Reed and B. Simon, Methods of Modern Mathematical Physics I: Functional Analysis, Academic Press, New York, 1972.
J. S. Sampaio Martins, Espac¸os Localmente Convexos, SPM Centro, Coimbra, 1981 (in Por- tuguese).
G. Szeg¨o, Orthogonal Polynomials, AMS Colloq. Publ. 23, 4th ed., AMS, Providence, RI, 1975.
F. Treves, Topological Vector Spaces, Distributions and Kernels, Academic Press, New York, 1967.
Jose´ Carlos Petronilho, Departamento de Matema´tica, Universidade de Coimbra, Apartado 3008, 3001-454 Coimbra, Portugal
E-mail address: josep@mat.uc.pt