Geodesic
Fixed points of periodic mappings in Hilbert spaces
Annales Universitatis Mariae Curie-Skłodowska. Mathematica , Tome 54 (2010) no. 2.

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In this paper we give new estimates for the Lipschitz constants of n-periodic mappings in Hilbert spaces, in order to assure the existence of fixed points and retractions on the fixed point set.
Keywords: Fixed point, retractions, periodic mappings 
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Perez Garcia, Victor; Fetter Nathansky, Helga. Fixed points of periodic mappings in Hilbert spaces. Annales Universitatis Mariae Curie-Skłodowska. Mathematica , Tome 54 (2010) no. 2. http://geodesic.mathdoc.fr/item/AUM_2010_54_2_a2/

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