There are many other contributors in philosophy and math. And this is just, once again, a sample of all of the folks who contributed. On the side of philosophy, you have Xenophon, who is another one of Socrates' students in addition to Plato. And in fact, the life of Socrates, we learn from the writings of Plato and Xenophon. Xenophon was also a historian who gave us some accounts of the later Peloponnesian War. You have the famous cynics, Antisthenes, and his student, Diogenes. Diogenes, famous for living in a barrel in Athens, and somewhat insulting Alexander the Great.