Pythagoras

Pythagoras of Samos
Pythagoras is sometimes thought of as the first true mathematician, yet little is known about his mathematical achievements. He was part of a religion that prescribed obedience, silence, abstinence from food, simplicity in dress and possessions, and the habit of frequent self-examinations. We do however credit him with the hypotenuse theory, also know as the Pythagorean theorem, and the theory of numbers. Most Greek mathematicians usually wrote books on their discoveries, but due to his strict lifestyle little was found on him.
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