Abstract

The following analysis of the Protagoras intends: contrary to the traditional tendency to consider the dialogue comparatively amorphous and polythematic, to clarify its argumentative architectonic; contrary to the scholarly view accompanying this tendency that of concern is an early dialogue, to make plausible the genesis of this dialogue after the Symposium; and to lay the groundwork for a more detailed discussion of the thesis that Plato, in his “middle” dialogues, makes the transition from Eleatic logic in its Megarian refraction, which forms the basis of the early dialogues as well as the Gorgias and incidentally also of the first book of the Republic, to that logic of the middle which is to be regarded as the immediate historical forerunner of Aristotelian syllogistic. Particular emphasis is placed in this context on the Protagoras insofar as Plato here not so much makes the discovery of the middle as he reflects it, a discovery which has after more than two thousand years of “classical logic” become inconspicuous to us, but which shattered his relation to the Megarian school and was the first to bury the fifth century logically.