The Greatest Aporia in the Parmenides (133b-134e) and the Reciprocity of Pros Relations

The extant attempts in the literature to refute the greatest difficulty argument in the Parmenides have focused on denying the parallelism between the pros relations among Forms and those among particulars. However, these attempts are unsatisfactory, for the argument can reach its conclusion that we cannot know any Forms without relying on this parallelism. I argue that a more effective strategy is to deny the more essential premise that the knowledge-object relation is a pros relation. This premise is false because pros relations require definitional and ontological codependence between the relata, and the knowledge-object relation does not satisfy this reciprocity condition.