The Degree of Convex Nondensifiability in Banach Spaces

Abstract

It is shown in this paper that the notion of α-dense curve in a bounded set of a metric space produces a degree of nondensifiability φd which extended to convex hulls of bounded sets in a Banach space generates a measure of noncompactness (briefly MNC) Φ that we will call degree of convex nondensifiability. We also prove that Φ dominates any other MNC and, in particular, dominates the MNC of Hausdorff of the best possible form in infinite dimensional Banach spaces.