Greek Pythagorean philosopher who used geometric methods to demonstrate that the hypotenuse of an isosceles triangle with legs of length one (i.e, , sometimes called Pythagoras's constant ) cannot be expressed as a ratio of integers. A number of this type is now called an irrational number. Legend has it that Hippasus made his discovery at sea and was thrown overboard by fanatic Pythagoreans.

Pythagoras