Parmenides

Parmenides is one of the dialogues of Plato. It is perhaps Plato's most challenging dialogue, as well as one of the most challenging works of philosophy ever written.

The Parmenides purports to be an account of a meeting between the two great philosophers of the Eleatic school, Parmenides and Zeno of Elea, and a very young Socrates. The occasion of the meeting was the reading by Zeno of his treatise defending Parmenidean monism against those partisans of plurality who asserted that Parmenides' supposition that there is a one gives rise to intolerable absurdities and contradictions.

— Excerpted from Wikipedia, the free encyclopedia.