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Fixed points of compositions of nonexpansive mappings: finitely many linear reflectors

Nonexpansive mappings play a central role in modern optimization and monotone operator theory because their fixed points can describe solutions to optimization or critical point problems. It is known that when the mappings are sufficiently "nice", then the fixed point set of the composition coincides with the intersection of the individual fixed point sets. In this paper, we explore the situation for compositions of linear reflectors. We provide positive results, upper bounds, and limiting examples. We also discuss classical reflectors in the Euclidean plane.

preprint2020arXivOpen access
Salihah AlwadaniHeinz H. BauschkeXianfu Wang
math.OCmath.FA
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Salihah AlwadaniHeinz H. BauschkeXianfu Wang

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