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Title: Finitely additive measures on topological spaces and Boolean algebras
Author: Ameen, Zanyar
ISNI:       0000 0004 5371 3514
Awarding Body: University of East Anglia
Current Institution: University of East Anglia
Date of Award: 2015
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The thesis studies some problems in measure theory. In particular, a possible generalization corresponding to Maharam Theorem for �nitely additive measures (charges). In the �rst Chapter, we give some de�nitions and results on di�erent areas of Mathematics that will be used during this work. In Chapter two, we recall the de�nitions of nonatomic, continuous and Darboux charges, and show their relations tWe hereby con�rm that all work without reference are our work excluding the chapter one. We hereby con�rm that all work without reference are our work excluding the chapter one. o each other. The relation between charges on Boolean algebras and the induced measures on their Stone spaces is mentioned in this chapter. We also show that for any charge algebra, there exists a compact zero-dimensional space such that its charge algebra is isomorphic to the given charge algebra. In Chapter three, we give the de�nition of Jordan measure and some of its outcomes. We de�ne another measure on an algebra of subsets of some set called Jordanian measure, and investigate it. Then we de�ne the Jordan algebras and Jordanian algebras, and study some of their properties. Chapter four is mostly devoted to the investigation of uniformly regular measures and charges (on both Boolean algebras and topological spaces). We show how the properties of a charge on a Boolean algebra can be transferred to the induced measure on its Stone space. We give a di�erent proof to a result by Mercourakis in [36, Remark 1.10]. In 2013, Borodulin-Nadzieja and Dºamonja [10, Theorem 4.1] proved the countable version of Maharam Theorem for charges using uniform regularity. We show that 3 4 this result can be proved under weaker assumption and further extended. The �nal Chapter is concerned with the higher versions of uniform regularity which are called uniform �-regularity. We study these types of measures and obtain several results and characterizations. The major contribution to this work is that we show we cannot hope for a higher analogue of Maharam Theorem for charges using uniform �-regularity. In particular, Theorem 4.1 in [10] and Remark 1.10 in [36] cannot be extended for all cardinals. We prove that a higher version of Theorem 4.1 in [10] (resp. Remark 1.10 in [36]) can be proved only for charges on free algebras on � many generators (resp. measures on a product of compact metric spaces). We also generalize Proposition 2.10 in [26].
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available