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Extrapolation and Local Acceleration of an Iterative Process for Common Fixed Point Problems

Andrzej Cegielski(a.cegielski***at***wmie.uz.zgora.pl)
Yair Censor(yair***at***math.haifa.ac.il)

Abstract: We consider sequential iterative processes for the common fixed point problem of families of cutter operators on a Hilbert space. These are operators that have the property that, for any point x∈H, the hyperplane through Tx whose normal is x-Tx always "cuts" the space into two half-spaces one of which contains the point x while the other contains the (assumed nonempty) fixed point set of T. We define and study generalized relaxations and extrapolation of cutter operators and construct extrapolated cyclic cutter operators. In this framework we investigate the Dos Santos local acceleration method in a unified manner and adopt it to a composition of cutters. For these we conduct convergence analysis of successive iteration algorithms.

Keywords: Common fixed point, cyclic projection method, cutter operator, quasi-nonexpansive operators, Dos Santos local acceleration.

Category 1: Convex and Nonsmooth Optimization (Convex Optimization )

Citation: Journal of Mathematical Analysis and Applications, accepted for publication.

Download: [PDF]

Entry Submitted: 04/19/2012
Entry Accepted: 05/01/2012
Entry Last Modified: 04/19/2012

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