SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Pythagoras (c.580-c.490 BC), Ancient Greek philosopher. Pythagoras is most famous for the theorem, a mathematical proof concerning triangles, that is named after him. He also discovered irrational numbers and established an eccentric religious community in southern Italy based on the mystical belief that "all is number". Artwork from the 19th century book Vies des Savants Illustres.
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