Pythagoras was a famous philosopher, mathematician and astronomer in ancient Greece. Born in Samos about 580 BC, he died in Tarrington about 500 BC. In his early years, he traveled to Egypt and Babylon. In order to get rid of tyranny, he moved to Crotone in the south of the Italian peninsula and organized a secret society that integrated politics, religion and mathematics. Later, he lost in the political struggle and was killed.

The Pythagorean school attaches great importance to mathematics and tries to explain everything with numbers. The purpose of their study of mathematics is not to be practical, but to explore the mysteries of nature. Pythagoras himself is famous for discovering Pythagoras theorem. In fact, Babylonians and China knew this theorem for a long time, but the earliest proof should be attributed to Pythagoras.

Pythagoras was also the founder of music theory. He expounded the relationship between the musical sound of Dan Xian and the string length. In astronomy, he initiated the theory of the earth circle. Pythagoras' thoughts and theories have a great influence on Greek culture.