L’objet de cette contribution est de montrer comment le recours « aveugle » aux caractères et au formalisme transforme, pour Leibniz, l’exercice de l’attention. Plus précisément, il s’agira de montrer en s’appuyant sur divers opuscules que le formalisme permet à la fois d’épargner l’attention, de la concentrer, de l’élargir, de la séquencer et de la transformer en un exercice collectif.

Leibniz’s conception of the relativity of motion has been discussed at length for a very long time. This paper doesn’t aim to give a full solution to this question, but to contribute to the debate by clarifying how the principle of relativity is introduced, justified and used in the “Dynamica”. Four different principles are identified : one purely geometrical, and three (meta) physical principles, which express God’s wisdom : a principle of equivalence of hypotheses linked to the action/reaction principle, a (...) Galilean principle of relativity and a general principle which apply not only to rectilinear motions but also to circular ones. I argue that to appreciate the coherence of Leibniz’ approach, we should distinguish these principles more sharply than he himself did and pay more attention to their status : are they consequences of the definition of motion, consequences of the physical laws or necessary conditions for any physical theory? (shrink)

Leibniz's work resembles its author. A. Robinet has called it “an intellectual storm.” In its two hundred thousand pages of manuscript (most of it still unpublished) there are philosophical works that have nourished the thoughts of thinkers from generation to generation; mathematical texts of fundamental import (we all know of Leibniz as the founder - or rather co-founder - of infinitesimal calculus, but this triumph ought not to obscure his other contributions; for example, his being a precursor in the field (...) of formal logic and the inventor of analysis situs); treatises on physics that have been relegated to obscurity by Newtonian mechanics but which may be in the process of being given new life because of the problems that the classic paradigm has encountered in the twentieth century; an impressive correspondence (approximately fifteen thousand letters, addressed to more than a thousand corespondents); significant contributions to fields as varied as theology, jurisprudence, history, politics and even technology (Leibniz did not scorn practical problems, and we find, alongside the most abstract of metaphysical systems, notes concerning the problem of Venice's sinking or the production of cognac). (shrink)