Cosmic Divergence, Weak Cosmic Convergence, and Fixed Points at Infinity

Ernest K. Ryu

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arXiv · 1709.02838

Cosmic Divergence, Weak Cosmic Convergence, and Fixed Points at Infinity

Ernest K. Ryu

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Abstract

To characterize the asymptotic behavior of fixed-point iterations of non-expansive operators with no fixed points, Bauschke et al. [Fixed Point Theory Appl. (2016)] recently studied cosmic convergence and conjectured that cosmic convergence always holds. This paper presents a cosmically divergent counter example, which disproves this conjecture. This paper also demonstrates, with a counter example, that cosmic convergence can be weak in infinite dimensions. Finally, this paper shows positive results relating to cosmic convergence that provide an interpretation of cosmic accumulation points as fixed points at infinity.

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Ernest K. Ryu. 2017-09-08. Cosmic Divergence, Weak Cosmic Convergence, and Fixed Points at Infinity. https://arxiv.org/abs/1709.02838

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