Pythagoras' famous theorem states that the sum of the square of the shorter sides of a right triangle is equal to the square of the longer side, which is the hypotenuse. He also worked on proving various other theorems or axioms, including that the square root of two, which is an irrational number, could not be given in the form of an integer or fraction. He also discovered that 28 was a perfect number.

Pythagoras was born around 569 B.C. in Samos, Greece. Aside from his work in mathematics, Pythagoras also made contributions to music theory and related music with mathematics. Pythagoras died some time between 500 and 475 B.C.

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