The relationships between nonexpansive, weakly nonexpansive, -nonexpansive, proximally nonexpansive, proximally continuous, almost lower semicontinuous, and -semicontinuous mappings in -trees are studied. Convergence theorems for the Ishikawa iteration processes are also discussed.
K. Samanmit. B. Panyanak. "On Multivalued Nonexpansive Mappings in ℝ-Trees." J. Appl. Math. 2012 (SI11) 1 - 13, 2012. https://doi.org/10.1155/2012/629149