Abstract
In this paper, we first show that a Banach space X has weak normal structure if and only if X has the weak fixed point property for nonexpansive mappings with respect to (wrt) orbits. Then, we give a counterexample to show that the Goebel–Karlovitz lemma does not hold for minimal invariant sets of nonexpansive mappings wrt orbits, and we present a modified version of the Goebel–Karlovitz lemma.
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Amini-Harandi, A., Fakhar, M. & Hajisharifi, H.R. Weak fixed point property for nonexpansive mappings with respect to orbits in Banach spaces. J. Fixed Point Theory Appl. 18, 601–607 (2016). https://doi.org/10.1007/s11784-016-0310-3
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DOI: https://doi.org/10.1007/s11784-016-0310-3