'Theaetetus'' - is a dialogue by the ancient Greek philosopher and thinker Plato (427-347 B. C). This is the conversation between Socrates, Euclid, Terpsion and Theaetetus about the three definitions of knowledge and about the difficulty of its nature. Plato thought about the organization and government of the state, was the founder of the theory of ideas, blessing and also the duality of the soul...