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Fundamenta Informaticae
2004 Vol. 63, nr 4 331--355
EN A bottom-up investigation of algebraic structures corresponding to many valued logical systems is made. Particular attention is given to the unit interval as a prototypical model of these kind of structures. At the top level of our construction, Heyting Wajsberg algebras are defined and studied. The[...]
Fundamenta Informaticae
EN Approximation operators play a vital role in rough set theory. Their three elements, namely, binary relation in the universe, basis algebra and properties, are fundamental in the study of approximation operators. In this paper, the interrelations among the three elements of approximation operators i[...]
Fundamenta Informaticae
EN In the paper we resolve an open problem posed by D.Ciucci in [1] on the independence of axioms for SBL-algebras. The main aim is to present its solution which is, in contrast to the one presented in [4], simple, transparent and easily verifiable.
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