Pythagoras has one of the most famous names in mathematics. This Greek's name is synonymous with geometry. The Pythagorean Theorem gives the length for the diagonal of any square or rectangle as the square-root of the sum of the squares of the legs. Surprisingly enough, he was not the first to discover this formula, but the first to prove it: "proof will follow"

His school is also responsible for noticing that strings produce harmonies when the ratios of their length are whole numbers.