A systematic treatment of the question, "What is knowledge?", this masterpiece from Plato's later period features a dialogue between Socrates and his student, Theaetetus. Topics include knowledge as perception, knowledge as true belief, and knowledge as a justified true belief. This edition was translated by the noted classical scholar Francis M. Cornford, who offers extensive ongoing commentaries that provide helpful background information and valuable insights. AUTHOR: Plato ranks among the most familiar ancient philosophers, along with his teacher, Socrates, and his student, Aristotle. In addition to writing philosophical dialogues - used to teach logic, ethics, rhetoric, religion, and mathematics as well as philosophy - he founded Athens' Academy, the Western world's first institution of higher learning.