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oai:docta.ucm.es:20.500.14352/584332024-07-12T13:46:17Zcom_20.500.14352_14col_20.500.14352_15

Gallardo Gutiérrez, Eva Antonia Montes Rodríguez, Alfonso 2023-06-20T18:43:24Z 2023-06-20T18:43:24Z 2003 0025-5831 10.1007/s00208-003-0442-9 https://hdl.handle.net/20.500.14352/58433 https//doi.org/10.1007/s00208-003-0442-9 http://link.springer.com/content/pdf/10.1007%2Fs00208-003-0442-9.pdf The adjoint of a linear fractional composition operator acting on the classical Dirichlet space is expressed as another linear fractional composition operator plus a two rank operator. The key point is that, in the Dirichlet space modulo constant functions, many linear fractional composition operators are similar to multiplication operators and, thus, normal. As a particular application, we can easily deduce the spectrum of each linear fractional composition operator acting on such spaces. Even the norm of each linear fractional composition operator is computed on the Dirichlet space modulo constant functions. It is also shown that all this work can be carried out in the Hardy space of the upper half plane. eng restricted access Adjoints of linear fractional composition operators on the Dirichlet space journal article