Hyperspace of convex compacta of nonmetrizable compact convex subspaces of locally convex spaces

Abstract

Our main result states that the hyperspace of convex compact subsets of a compact convex subset $X$ in a locally convex space is an absolute retract if and only if $X$ is an absolute retract of weight $\le {\omega }_1$. It is also proved that the hyperspace of convex compact subsets of the Tychonov cube $I^{{\omega }_1}$ is homeomorphic to $I^{{\omega }_1}$. An analogous result is also proved for the cone over $I^{{\omega }_1}$. Our proofs are based on analysis of maps of hyperspaces of compact convex subsets, in particular, selection theorems for such maps are proved.

Cited by in corpus (1)

• Vietoris topology on hyperspaces associated to a noncommutative compact space