Wydawnictwa / Czasopisma IMPAN / Studia Mathematica / Wszystkie zeszyty

Streszczenie

Let $X$ be a compact convex set, $\operatorname {ext}X$ stand for the set of extreme points of $X$, $F$ be a Fréchet space and $f\colon X\to F$ be a strongly affine mapping. The aim of our paper is to investigate transfer of descriptive properties of $f|_{\operatorname {ext}X}$ to $f$, thus generalizing results of Saint-Raymond (1976) and Ludvik and Spurný (2012) to the vector-valued context. As a corollary, we obtain a vector-valued analogue of a result of J. Lindenstrauss and D. E. Wulbert (1969) on $L_1$-preduals and answer positively Questions 10.6 and 10.7 from Kalenda and Spurný (2016).