Transitive fuzzy dependencies (II)
In the previous work we accomplished the problem of defining fuzzy dependency as well as projection and join operators which allow us to decompose a database in such a way that this process is fuzzy loss less. The definition of rules-based fuzzy dependency did not satisfy the transitivity axiom, which is crucial to obtaining the completeness of the counterpart of Armstrong axioms for fuzzy dependencies. In this paper we introduce an alternative definition of dependency called restricted dependency, satisfying the transitivity property of inference. All the results obtained with the first definition of dependency are also extended to this case. The price to pay for transitivity is a more restricted definition of fuzzy dependency. (C) 1999 Elsevier Science B.V. All rights reserved.
transitivity axiom fuzzy functional dependencies fuzzy projection fuzzy join fuzzy loss less decompositions