Zeno and Melissusa

In clato's parmenidies, it looks like the dialogue begins just as zeno has finished reciting from his book. So thereis zeno, obviously, and tere's also melissus, and the two of them seem to have been extending priauses philosophy, or defending it in some way. It's quite hard to understand the relationship of zeno and melissus to er philosophically, that's to say, to topominides and zeno.