A relação entre o principio de razão suficiente e o principio da contradição em Leibniz

Abstract

According to Leibniz, our reasonings are grounded upon two great principles, the Principle of Contradiction and the Principle of Sufficient Reason. Despite the recognized relevance of these principles to his philosophy, there are many interpretations about the real role they play inside this and about their relationship with each other. Our study is oriented not only by the Leibniz interpretation, but also by the vision of some of his commentators, especially three of them: Russell, Couturat and Deleuze. We will search, among other things, if those principles are independent of each other; if they are applicable to all kinds of true; if the Principle of Perfection is a particularization of the Principle of Sufficient Reason or if it is irreducible to it; and if the truths of reason are headed by the Principle of Contradiction and if the truths of fact are headed by the Principle of Sufficient Reason. The articulation of these principles brings us to a third point: the conception of truth as the inclusion of the concept of the predicate in the subject, which we will analyse based on the different points of view about the essential and existential propositions. With regard to the last one, we will investigate if they represent or not an exception to the analytical character of all truth propositions.