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Análisis filosófico

versión On-line ISSN 1851-9636


ZULETA, Hugo R.. Lógica deóntica y verdad. Anal. filos. [online]. 2006, vol.26, n.1, pp.115-133. ISSN 1851-9636.

In this paper I discuss a proposal from C. Alchourrón and A. Martino (1990) with which they try to face the problem posed to the foundation of deontic logic by Jørgensen' s dilemma. Their proposal is based on the idea that there is no problem at all in compatibilizing the fact that norms lack truth values with their possession of a logic, once it is denied that it is absolutely necessary to offer a semantic characterization of logical properties and relations, and the abstract notion of consequence is taken as primitive. They claim that the meaning of deontic operators, like that of logical terms in natural deduction, is completely expressed through their use, which is explained by means of rules of introduction and elimination. As an illustration, they present a calculus with which they intend to offer a foundation for standard deontic logic. I make three objections: a) They don' t use real rules of introduction for deontic operators; b) They don' t have derived standard deontic logic as they claim; c) There are no criteria for relating the formulas with ordinary normative discourse; so there are no reasons for considering their calculus as a deontic logic. I claim that, in order to give a semantical foundation to deontic logic it is only necessary that there are admissible interpretations that assign truth values to norms, and that this requisite is satisfied by the usual semantic of standard deontic logic. I conclude that Jørgensen' s dilemma is a pseudoproblem.

Palabras clave : Deontic logic; Jørgensen' s dilemma; Norm; Truth-value; Logical consequence.

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