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Browsing by Author "Llave, R. de la"

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    A Simple Proof of C. Siegel's Center Theorem
    (1982) Llave, R. de la
    We give an elementary proof of a particular case of C. Siegel's center theorem, based on a method of M. Herman. Even if the proof has less generality than the standard one, it is simpler and provides sharper bounds.