With the end of the Peloponnesian War,Athens ,although reduced to a minor political power, regained her cultural leadership, and the Athenian school again flourished.Plato was born in Athens during the year of the great plague, studied philosophy under Socrates there and mathematics under Theodorus at Cyrene on the African coast, was an intimate friend of Archytas, and upon his return to Athens in 380 B.C., founded his famous Academy there. Eudoxus, who studied under both Archytas and Plato,founded a school at Cyzicus in northern Asia Minor. Menaechmus, an associate of Plato and a pupil of Eudoxus, invented the conic sections. Dinostratus,brother of Menaechmus, was an able geometer and a pupil of Plato. Theaetetus, a man of unusual natural gifts and to whom we are probably indebted for much of the material of Euclid's tenth and thirteenth books, was another Athenian pupil of Theodorus. Mention should also be made of Aristotle who, though not a professed mathematician, was the systematizer of deductive logic and a writer on physical subjects; some parts of his Analytical posteriora show an unusual grasp of the mathematics method.