An Introduction to Many-Valued and Fuzzy Logic: Semantics, by Merrie Bergmann

By Merrie Bergmann

This quantity is an available creation to the topic of many-valued and fuzzy good judgment appropriate to be used in proper complex undergraduate and graduate classes. The textual content opens with a dialogue of the philosophical concerns that provide upward push to fuzzy common sense - difficulties coming up from obscure language - and returns to these concerns as logical platforms are awarded. For historic and pedagogical purposes, three-valued logical structures are awarded as necessary intermediate platforms for learning the foundations and idea at the back of fuzzy common sense.

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Extra resources for An Introduction to Many-Valued and Fuzzy Logic: Semantics, Algebras, and Derivation Systems

Example text

P→ (Q → P) CL2. (P → (Q → R)) → ((P → Q) → (P→ R)) CL3. (¬P → ¬Q) → (Q → P) and the single inference rule MP, which is short for the rule’s traditional name, Modus Ponens: MP (Modus Ponens). From P and P→ Q, infer Q. An axiom schema stands for infinitely many axioms, namely, all formulas that have the overall form exemplified by the schema. We call such formulas instances of the axiom schema. We can define an instance of an axiom schema to be any formula that results from uniform substitution of formulas of the language (not necessarily distinct) for each of the letters P, Q, and R.

3 Normal Forms In this section we introduce disjunctive and conjunctive normal forms for formulas. Each formula of propositional logic has an equivalent formula in disjunctive normal form, and an equivalent formula in conjunctive normal form. The normal forms are used to standardize (normalize) the forms of logical formulas for various reasons, such as allowing the use of a computational proof technique known as resolution (Robinson 1965). 5. More importantly, the normal forms will allow us to make some semantic connections among classical logic, three-valued logics, and fuzzy logics.

4. Every predicate of arity n followed by n terms is a formula. If P is a formula, so is ¬P. If P and Q are formulas, so are (P ∧ Q), (P ∨ Q), (P → Q), and (P ↔ Q). If P is a formula, so are (∀x)P and (∃x)P. Formulas formed in accordance with clause 1 are atomic formulas, and the others are compound formulas. Formulas formed in accordance with 2 and 3 are, respectively, called (as they are in propositional logic) negations, conjunctions, disjunctions, conditionals, and biconditionals. (∀x) is called a universal quantifier and (∀x)P is called a universally quantified formula or a universal quantification.

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