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 In its two hundred thousand pages of manuscript (most of it still unpublished) there are philosophical works that have nourished the thoughts of thinkers from generation to generation; mathematical texts of fundamental import (we all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).