negation rule

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• Negation as failure — (NAF, for short) is a non monotonic inference rule in logic programming, used to derive (i.e. that is assumed not to hold) from failure to derive . Note that can be different from the statement of the logical negation of …   Wikipedia

• Negation — For other uses, see Negation (disambiguation). In logic and mathematics, negation, also called logical complement, is an operation on propositions, truth values, or semantic values more generally. Intuitively, the negation of a proposition is… …   Wikipedia

• Negation (linguistics) — In rhetoric, where the role of the interpreter is taken into consideration as a non negligible factor, negation bears a much wider range of functions and meanings than it does in logic, where the interpretation of signs for negation is… …   Wikipedia

• negation — [[t]nɪge͟ɪʃ(ə)n[/t]] 1) N SING: N of n The negation of something is its complete opposite or something which destroys it or makes it lose its effect. [FORMAL] Unintelligible legislation is the negation of the rule of law and of parliamentary… …   English dictionary

• Rule Interchange Format — Le Rule Interchange Format (RIF ) est une recommandation du W3C. RIF fait partie de la feuille de route du web sémantique, avec principalement SPARQL, RDF et OWL. Bien que prévu initialement par beaucoup comme une couche de règles logiques pour… …   Wikipédia en Français

• Descartes' rule of signs — In mathematics, Descartes rule of signs, first described by René Descartes in his work La Géométrie, is a technique for determining the number of positive or negative real roots of a polynomial. The rule gives us an upper bound number of positive …   Wikipedia

• Minimal negation operator — In logic and mathematics, the minimal negation operator u! is a multigrade operator ( u {k}) {k in mathbb{N where each u {k}! is a k ary boolean function defined in such a way that u {k}(x 1, ldots , x k) = 1 if and only if exactly one of the… …   Wikipedia

• Admissible rule — In logic, a rule of inference is admissible in a formal system if the set of theorems of the system is closed under the rule. The concept of an admissible rule was introduced by Paul Lorenzen (1955).DefinitionsThe concept of admissibility, as… …   Wikipedia

• Righthand head rule — In generative morphology, the righthand head rule is a of grammar that specifies that the rightmost morpheme in a morphological structure is always the head. What this means is that it is the righthand element that provides the primary syntactic… …   Wikipedia

• formal logic — the branch of logic concerned exclusively with the principles of deductive reasoning and with the form rather than the content of propositions. [1855 60] * * * Introduction       the abstract study of propositions, statements, or assertively used …   Universalium

• Boolean algebras canonically defined — Boolean algebras have been formally defined variously as a kind of lattice and as a kind of ring. This article presents them more neutrally but equally formally as simply the models of the equational theory of two values, and observes the… …   Wikipedia