Composition Operators on the Dirichlet space and related problems

• Autores: Gerardo Antonio Chacón Guerrero, Gerardo R. Chacón, José Giménez
• Localización: Boletín de la Asociación Matemática Venezolana, ISSN-e 1315-4125, Vol. 13, Nº. 2, 2006, págs. 155-164
• Idioma: inglés
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• Resumen

  • In this paper we investigate the following question: when a bounded analytic function ' on the unit disk D, fixing 0, is such that the family {'n : n = 0, 1, 2, . . . } is orthogonal in the Dirichlet space D?. We also consider the problem of characterizing the univalent, full self-maps ' of D in terms of the norm of the induced composition operator C' : D �¨ D.

    The first problem is analogous to a celebrated question asked byW. Rudin on the Hardy space setting that was answered recently ([3] and [14]). The second problem resembles a problem investigated by J. Shapiro in [13] about characterization of inner functions  in the terms of kCkH2 .