Introduction to an Algebra of Belief Functions on Three-Element Frame of Discernment - A Quasi Bayesian Case
Abstrakt
The study presents an introduction to algebraic structures related to belief functions (BFs) on 3-element frame of discernment. Method by Hájek & Valdés for BFs on 2-element frames is generalized to larger frame of discernment. Due to complexity of the algebraic structure, the study is divided into 2 parts, the present one is devoted to the case of quasi Bayesian BFs. Dempster’s semigroup of BFs on 2-element frame of discernment by Hájek-Valdés is recalled. A new definition of Dempster’s semigroup (an algebraic structure) of BFs on 3-element frame is introduced; and its subalgebras in general, subalgebras of Bayesian BFs and of quasi Bayesian BFs are described and analysed. Ideas and open problems for future research are presented.