Fuzzy logic

T-norm fuzzy logics

T-norm fuzzy logics are a family of non-classical logics, informally delimited by having a semantics that takes the real unit interval [0, 1] for the system of truth values and functions called t-norms for permissible interpretations of conjunction. They are mainly used in applied fuzzy logic and fuzzy set theory as a theoretical basis for approximate reasoning. T-norm fuzzy logics belong in broader classes of fuzzy logics and many-valued logics. In order to generate a well-behaved implication, the t-norms are usually required to be left-continuous; logics of left-continuous t-norms further belong in the class of substructural logics, among which they are marked with the validity of the law of prelinearity, (A → B) ∨ (B → A). Both propositional and first-order (or higher-order) t-norm fuzzy logics, as well as their expansions by modal and other operators, are studied. Logics that restrict the t-norm semantics to a subset of the real unit interval (for example, finitely valued Łukasiewicz logics) are usually included in the class as well. Important examples of t-norm fuzzy logics are monoidal t-norm logic MTL of all left-continuous t-norms, basic logic BL of all continuous t-norms, product fuzzy logic of the product t-norm, or the of the nilpotent minimum t-norm. Some independently motivated logics belong among t-norm fuzzy logics, too, for example Łukasiewicz logic (which is the logic of the Łukasiewicz t-norm) or Gödel–Dummett logic (which is the logic of the minimum t-norm). (Wikipedia).

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Related pages

Idempotence | Algebraic structure | Truth value | Łukasiewicz logic | Substructural logic | Unary operation | Lattice (order) | Tautology (logic) | Completeness (logic) | Total order | Fuzzy set | Computational complexity | Propositional formula | Well-formed formula | T-norm | Arity | Atomic formula | Non-classical logic | Higher-order logic | Many-valued logic | Modal operator | Residuated lattice | Truth table | Real number | BL (logic) | Involution (mathematics) | Modus ponens | Deduction theorem | Propositional variable | Quantifier (logic) | Intermediate logic | Three-valued logic | Intuitionistic logic | Michael Dummett | Logical conjunction | Fuzzy logic | First-order logic | Monoidal t-norm logic | Algebraic semantics (mathematical logic)