T he main dialogue is prefaced by an introductory conversation between Eucleides and Terpsion of Megara, friends of Socrates who were present at his death. Plato evidently wished to record his affection for Theaetetus, a member of the Academy credited with important discoveries in mathematics. Eucleides' account of how he came to write the main dialogue is obviously fictitious. No such conversation could have taken place in Socrates’ lifetime.