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Coherent pairs of linear functionals on the unit circle

  • Autores: A. Branquinho, Ana Pilar Foulquié Moreno, Francisco Marcellán Español, M. N. Rebocho
  • Localización: Journal of approximation theory, ISSN 0021-9045, Vol. 153, Nº 1, 2008, págs. 122-137
  • Idioma: inglés
  • Texto completo no disponible (Saber más ...)
  • Resumen
    • In this paper we extend the concept of coherent pairs of measures from the real line to Jordan arcs and curves. We present a characterization of pairs of coherent measures on the unit circle: it is established that if (µ0,µ1) is a coherent pair of measures on the unit circle, then µ0 is a semi-classical measure. Moreover, we obtain that the linear functional associated with µ1 is a specific rational transformation of the linear functional corresponding to µ0. Some examples are given.


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