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Journal of Computational and Applied Mathematics
Article
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Journal of Computational and Applied Mathematics
Article . 1994
License: Elsevier Non-Commercial
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Journal of Computational and Applied Mathematics
Article . 1994 . Peer-reviewed
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Article . 1994
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Strong convergence of almost simultaneous block-iterative projection methods in Hilbert spaces

Authors: Butnariu, Dan; Censor, Yair;

Strong convergence of almost simultaneous block-iterative projection methods in Hilbert spaces

Abstract

Let \(Q_ i\), \(i= 1,\dots, m\), be a finite family of closed convex sets in a Hilbert space \(H\) with a nonempty intersection. The convex feasibility problem (CFP) is to find an element \(x^*\in Q= \bigcap^ m_{i= 1} Q_ i\). The block-iterative projection algorithmic scheme for solving the CFP problem in \(n\)-dimensional Euclidean space iteratively generates the following sequence. Choose an initial point \(x^ 0\in H\) and, for each \(k\) set \(x^{k+ 1}= x^ k+ \lambda_ k \sum^ m_{i= 1} w_ k(i) (P_ i(x^ k)- x^ k)\), where \(P_ i(x^ k)\) is the orthogonal projection of \(x^ k\) onto the set \(Q_ i\), \(w_ k: \{1,\dots, m\}\to \mathbb{R}_ +\) is a weight function \((\sum^ m_{i= 1} w_ k(i)= 1)\) and \(\lambda_ k \in\mathbb{R}_ +\) are relaxation parameters, \(0< \varepsilon_ 1\leq \lambda_ k\leq \varepsilon_ 2< 2\). The objective of the paper is to study the generalization of this method to the problem in a Hilbert space \(H\) and the convergence of this generalization. It is known that under quite mild conditions on the weight functions and regardless of the choice of the initial parameters this method generates a weakly convergent sequence regardless of the choice of the initial point. It is shown that ensuring the strong convergence of such sequence is more difficult and usually demands some additional conditions on the set of the \(Q_ i\) themselves.

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Keywords

Applied Mathematics, Convex feasibility problem, Hilbert space, Boundedly compact set, Convex sets without dimension restrictions (aspects of convex geometry), General theory of numerical analysis in abstract spaces, block-iterative projection method, strong convergence, convex feasibility problem, Computational Mathematics, Uniformly convex set, Block-iterative projection method, Strong convergence, Hilbert and pre-Hilbert spaces: geometry and topology (including spaces with semidefinite inner product), weak convergence, Weak convergence

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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!
15
Average
Top 10%
Average
hybrid