On the regularity of averages over spheres for kinetic transport equations in hyperbolic Sobolev spaces.
N. Bournaveas, S. Gutiérrez (2007)
Revista Matemática Iberoamericana
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N. Bournaveas, S. Gutiérrez (2007)
Revista Matemática Iberoamericana
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A. Brundnyi, Y. Brundnyi (2007)
Revista Matemática Iberoamericana
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F. Broglia, F. Pieroni (2009)
Revista Matemática Iberoamericana
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S. Izumiya, F. Tari (2008)
Revista Matemática Iberoamericana
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Manuel D. Contreras, Santiago Díaz-Madrigal (2005)
Revista Matemática Iberoamericana
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In this paper we characterize the semigroups of analytic functions in the unit disk which lead to semigroups of operators in the disk algebra. These characterizations involve analytic as well as geometric aspects of the iterates and they are strongly related to the classical theorem of Carathéodory about local connection and boundary behaviour of univalent functions.
T Byczkowski, P. Graczyk, A. Stós (2007)
Revista Matemática Iberoamericana
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Karlheinz Kiyek, Jürgen Stückrad (2003)
Revista Matemática Iberoamericana
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Joaquim Bruna, Alexander Olevskii, Alexander Ulanovskii (2006)
Revista Matemática Iberoamericana
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We characterize, in terms of the Beurling-Malliavin density, the discrete spectra Λ ⊂ R for which a generator exists, that is a function φ ∈ L(R) such that its Λ translates φ(x - λ), λ ∈ Λ, span L(R). It is shown that these spectra coincide with the uniqueness sets for certain analytic clases. We also present examples of discrete spectra Λ ∈ R which do not admit a single generator while they admit a pair of generators.
Monireh Sedghi (2006)
Revista Matemática Iberoamericana
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F. Bayart (2008)
Revista Matemática Iberoamericana
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Herbert Koch, Winfried Sickel (2002)
Revista Matemática Iberoamericana
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