Pythagoras (approximately 582 BC–507 BC, Greek: Πυθαγόρας) was an Ionian (Greek) mathematician and philosopher, founder of the mystic, religious and scientific society called Pythagoreans. He is best known for the Pythagorean theorem which bears his name. Known as "the father of numbers", Pythagoras made influential contributions to philosophy and religious teaching in the late 6th century BC. Because legend and obfuscation cloud his work even more than with the other pre-Socratics, one can say little with confidence about his life and teachings. We do know that Pythagoras and his students believed that everything was related to mathematics and, through mathematics, everything could be predicted and measured in rhythmic patterns or cycles.
Upon his migration from Samos to Crotone, Pythagoras established a secret religious society very similar to (and possibly influenced by) the earlier Orphic cult.
Pythagoras undertook a reform of the cultural life of Crotone, urging the citizens to follow virtue and form an elite circle of followers around himself. Very strict rules of conduct governed this cultural center. He opened his school to male and female students alike. Those who joined the inner circle of Pythagoras's society called themselves the Mathematikoi. They lived at the school, owned no personal possessions and were required to assume a vegetarian diet. Other students who lived in neighboring areas were also permitted to attend Pythagoras's school. Known as Akousmatics, these students were permitted to eat meat and own personal belongings.
More on [ Pythagoras ]

Encarta: Pythagoras - Encyclopedia article provides an introduction to the Greek philosopher and mathematician.
Pythagoras - Student-written biography focuses on his most significant achievements.
Pythagoras of Samos - Detailed biography, including pictures, from the MacTutor History of Mathematics archive.
Meta Description: [ Pythagoras (569BC-475BC) ]
The Proof: Pythagorean Puzzle - A fun look at the man and one of his best-known equations. Includes Shockwave demonstration. From Nova Online.
The Theorem of Pythagoras - Brief description and proof of the Pythagorean theorem.
Meta Description: [ Brief description and proof of the Pythagorean theorem by dissection, based on squares of sum and difference ]
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