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Journal of the History of Philosophy 41.3 (2003) 416-417



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Jean-Baptiste Rauzy. La Doctrine leibnizienne de la vérité. Aspects logiques et ontologiques. Paris: Vrin, 2001. Pp. vii + 353. Paper, FF 170,55.

This important book provides a reappraisal of Leibniz's philosophy of logic and epistemology based on a close scrutiny of the recently edited manuscripts in the Akademie-Ausgabe, and a reconstitution of Leibniz's sequential investigations. The author displays an exceptional knowledge of the Leibnizian corpus, the ancient and medieval sources for the various doctrines he analyzes, and the contemporary issues underpinning Leibniz's investigations. He aims at rectifying misconceptions that stemmed originally in Couturat's La Logique de Leibniz (1901) and have since affected several studies. Three methodological statements set the ground for Rauzy's analysis: (1) Leibniz's notion of truth concerns in unified fashion all the elements of discourse: terms, concepts, and propositions. (2) Leibniz did not restrict his doctrine of truth to consistency relations, but yielded a complex, well-articulated conception of truth as correspondence, as evidenced in New Essays on Human Understanding, IV, v, sect. 11; yet, at the same time, his doctrine focused on conceptual relations which specify an order of reasons deserving to be analyzed for their own sake: "Dans la doctrine leibnizienne de la vérité, l'adaequatio rei constitue encore le cadre général en dehors duquel le prédicat de vérité n'a pas de sens. Mais les concepts et les liaisons conceptuelles donnent désormais la raison pour laquelle telle phrase particulière est vraie . . ." (47). And (3) one should resist attributing to Leibniz a purely syntactic conception of truth since the semantic dimension of his logical analyses deserves to be reconstituted and due consideration should be given to the evolution of his thoughts on central philosophical issues, which occasioned significant variations in the elements and formulas of his calculus rationis.

It is merely possible to render the rich contents of the book by mentioning some of its more striking features. In Chapter 1, the inesse principle (Praedicatum inestsubjecto) is shown to serve grammatical, logical, and conceptual functions. The doctrine of expression is finely analyzed: expression is shown to provide the major translation tool between characters and thoughts and to condition the combinatorial treatment of rational discourse. In Chapter 2, the distinction between concept and object is shown to involve some relativity, even if the understanding of complete notions is supposed to entail real knowledge of the corresponding realities. Leibniz is thus justified to represent the manifold of ontological relations, including the requisites of actual existence, in a tentatively unified logical way: "Que [End Page 416] l'existence soit une propriété relationnelle complexe, conçue tantôt par la relation de compatibilité, tantôt par une relation à l'esprit en général—et éventuellement [. . .] par un mixte des deux—n'interdit nullement de maintenir que la vérité de toutes les propositions dépend de relations conceptuelles" (124-5). In Chapter 3, the project of a calculus based on concepts is shown to entail a special relation, hardly dealt with in the literature, between intension and extension (cf. for instance New Essays, IV, xvii, sect. 8). Rauzy reassesses in particular Leibniz's critical revision of nominalism and of inductive procedures as these require universal propositions to ground rational presumptions. The extensional notion of class is considered an abstraction: a class presupposes therefore the extension of a concept in order to become an object of thought. The principle of conceptual inherence requires to be interpreted as stating the equipollence between the requisites of subject and predicate; if such an equipollence may be reached a priori in exceptional cases, most of the time it will require various kinds of additions and derivations to yield sufficient congruence between the related terms. Chapter 4 is devoted to substitutions, more precisely to the theory of definition and the context, at once logical and discursive, from which a potential Leibnizian theory of communication might be derived. Rauzy notes that substitutive equivalences...

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