On the Length of the Periods of Non-expansive Mappings
نویسنده
چکیده
Upper bounds are given for the maximum period of periodic solutions of non-expansive mappings in the Banach space (IR n ; j j) with 1 < < 1. Basic in the derivation of these upper bounds are a theorem of Banach on rotations 2] and a geometric property of (IR n ; j j) for 6 = 2 5]. This paper provides a valid proof of a conjecture which appeared in 9]. Some remarks are made about what is diierent in the case of the sup-norm (p = 1). R esum e: Des bornes sup erieures sont donn ees pour la p eriode maximum des solutions p eriodiques des transformations non-expansives dans l'espace de Banach (IR n ; j j) pour 1 < < 1. L'obtention de ces bornes sup erieures repose sur un th eor eme de Banach sur des rotations 2] et sur une propi et e g eom etrique de (IR n ; j j) pour 6 = 2 5]. Cet article donne une preuve de l'aarmation parue dans 9]. Quelques remarques sue les dii erences dans le cas o u la norme sup erieure est utilis ee, sont faites.
منابع مشابه
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تاریخ انتشار 2007