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A strongly convergent hybrid proximal method in Banach spaces

A strongly convergent hybrid proximal method in Banach spaces.
Authors: Gárciga Otero, Rolando; Svaiter, B.F.;

A strongly convergent hybrid proximal method in Banach spaces

Abstract

When extended to a (not necessarily Hilbertian) reflexive Banach space \(B\) setting, the Martinet-Rockafellar proximal point method of finding zeros for a (set-valued) maximal monotone operator \(T\) is the following procedure of generating a sequence \(\{x^k\}_{k\in\mathbb{N}}\) starting form an arbitrary pint \(x^0\in B\): \[ \text{Given }x^k\text{ define }x^{k+1}\text{ by }0\in Tx^{k+1}+ \lambda_k(f'(x^{k+1})- f'(x^k)), \] where \(\{\lambda_k\}_{k\in\mathbb{N}}\) is a bounded sequence of positive real numbers and \(f\) is a differentiable totally convex function on \(B\) [cf. \textit{D. Butnariu} and \textit{A. N. Iusem}, Numer. Funct. Anal. Optim. 18, No. 7--8, 723--744 (1997; Zbl 0891.49002)] and \textit{R. S. Burachik} and \textit{S. Scheimberg}, SIAM J. Control Optim. 39, No. 5, 1633--1649 (2001; Zbl 0988.90045)]. Under undemanding conditions, sequences generated according to this procedure are bounded and converge subsequentially weakly to points \(x\) such that \(0\in Tx\). Weak convergence of the entire sequence is happening under quite demanding conditions on \(f\) and, implicitly on the geometric structure of \(B\). Even if weak convergence occurs, strong convergence may not happen. In [Math. Program. 87A, No. 1, 189--202 (2000; Zbl 0971.90062)] \textit{M. V. Solodov} and \textit{B. F. Svaiter}, show an elegant way of modifying that procedure in order to obtain strong convergence of the generated sequences. In the paper under review, the authors follow the same basic idea of modifying the procedure in a non-Hilbertian Banach space context, in order to produce a strongly convergent proximal point like method which is remarkably stable under computational errors.

Keywords

Programming in abstract spaces, Hybrid steps, relative error, Numerical solutions to equations with nonlinear operators, Applied Mathematics, proximal point method, Proximal point method, strong convergence, hybrid steps, Inexact solutions, Iterative procedures involving nonlinear operators, Strong convergence, Enlargement of maximal monotone operators, Relative error, enlargement of maximal monotone operators, Analysis, totally convex function, inexact solutions

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
12
Average
Top 10%
Average
hybrid