A propriedade positiva de Schur em reticulados de Banach

Abstract

The purpose of this dissertation is to study, in several aspects, the positive Schur property in Banach lattices. In order to justify the example of a Banach lattice with the positive Schur property failing the Schur property, a criterion for weak convergence in L 1 [0, 1], which recovers the Rademacher sequence as a particular instance, is proved. Examples, counterexamples and several properties of the positive Schur property are provided. We also study this property in countable direct sums and in l p (Γ)-spaces. Next, the positive Schur property in spaces of regular operators is investigated, and a lattice version of Ryan’s Theorem is proved. Finally, several characterizations of the positive Schur property in dual lattices are proved.