Approximation of integration maps of vector measures and limit representations of Banach function spaces
Tom 120 / 2017
Annales Polonici Mathematici 120 (2017), 63-81
MSC: Primary 46G10, 28B05; Secondary 46E30, 47B07, 47B38.
DOI: 10.4064/ap170407-21-9
Opublikowany online: 8 November 2017
Streszczenie
We study whether or not the integration maps of vector measures can be computed as pointwise limits of their finite rank Radon–Nikodým derivatives. The positive cases are obtained by using the circle of ideas related to the approximation property for Banach spaces. The negative ones are given by means of an appropriate use of the Daugavet property. As an application, we analyse when the norm in a space $L^1(m)$ of integrable functions can be computed as a limit of the norms of the spaces of integrable functions with respect to the Radon–Nikodým derivatives of $m$.
