In this paper are introduced some concepts of interval-valued fuzzy relations and some of their properties: reflexivity, symmetry, T-transitivity, composition and local reflexivity. The existence and uniqueness of T-transitive closure of interval-valued fuzzy relations is proved. An algorithm to compute the T-transitive closure of finite interval-valued fuzzy relations is showed. Some properties and some examples is given for t-representable and t-pseudo representable generalized t-norms.
González del Campo, R.; Garmendia, L.; Recasens, J. Transitive closure of interval-valued fuzzy relations. "An international journal on computational intelligence techniques, methods and applications", Juliol 2013, vol. 6, núm. 4, p. 648-657.