
Journal of Convex Analysis 28 (2021), No. 3, [final page numbers not yet available] Copyright Heldermann Verlag 2021 Multimeasures with Values in Conjugate Banach Spaces and the Weak RadonNikodým Property Kazimierz Musial Institute of Mathematics, Wroclaw University, 50384 Wroclaw, Poland kazimierz.musial@math.uni.wroc.pl [Abstractpdf] I prove that for a Banach space $X$ the conjugate space $X^*$ has the WRNP if and only if for every complete probability space $(\varOmega,\varSigmaS,\mu)$, every $\mu$continuous multimeasure of $\sigma$finite variation that takes as its values closed (closed bounded, weak$^*$compact) and convex subsets of $X^*$ can be represented as a Pettis integral of a multifunction with closed bounded (closed bounded, weak$^*$ compact) and convex values. This generalizes the known characterization of conjugate Banach spaces with the weak RadonNikod\'{y}m property via functions (cf. the author, {\it The weak RadonNikod\'{y}m property of Banach spaces}, Studia Math. 64 (1979) 151174, or {\it Pettis integral}, in: {\it Handbook of Measure Theory I}, Elsevier, Amsterdam (2002) 532586). The main tool is a lifting of a multifunction (see section 3), that is Effros measurable with respect to the weak$^*$ open subsets of $X^*$. Keywords: Multimeasures, multifunctions, weak RadonNikod\'{y}m property, Pettis integral, lifting. MSC: 28B20; 28B05, 46G10, 54C60. [ Fulltextpdf (185 KB)] for subscribers only. 