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Back-and-forth systems for fuzzy first-order models
DOI:10.1016/j.fss.2018.01.016.png)
Abstract
En 中文
This paper continues the study of model theory for fuzzy logics by addressing the fundamental issue of classifying models according to their first-order theory. Three different definitions of elementary equivalence for fuzzy first-order models are introduced and separated by suitable counterexamples. We propose several back-and-forth conditions, based both on classical two-sorted structures and on non-classical structures, that are useful to obtain elementary equivalence in particular cases as we illustrate with several examples. (C) 2018 Elsevier B.V. All rights reserved.
Keywords:
Mathematical fuzzy logic
First-order fuzzy logics
Non-classical logics
Elementary equivalence
Back-and-forth systems
Model theory
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