Measures of Noncircularity and Fixed Points of Contractive Multifunctions
In analogy to the Eisenfeld-Lakshmikantham measure 15-eg2373cl of nonconvexity and the Hausdorff measure of noncompactness, we introduce two mutually equivalent measures of noncircularity for Banach spaces satisfying a Cantor type property, and apply them to establish a fixed point theorem of Darbo type for multifunctions.Namely, we prove that clic