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Markov properties and factorization of possibility distributions. (English) Zbl 1014.68155
Summary: Markov properties and factorization are powerful tools allowing the expression of multidimensional probability distributions by means of low-dimensional ones. As multidimensional possibilistic models have been studied for several years, the demand for analogous tools in possibility theory seems quite natural. This paper is intended to be a promotion of De Cooman’s measure-theoretic approach to possibility theory, as this approach allows us to find analogies to many important results obtained in a probabilistic framework. First we recall our definition of conditional possibilistic independence, parameterized by a continuous t-norm, and its properties. Then we introduce Markov properties, based on this conditional independence notion, and factorization of possibility distributions (again parameterized by a continuous t-norm) and we find the relationships between them. Our results are accompanied by a number of counterexamples, which show that the assumptions of particular theorems are substantial.

MSC:
68T30 Knowledge representation
28E10 Fuzzy measure theory
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