Hippasus was the student of Pythagoras who discovered the IRRATIONAL NUMBER.

**What is IRRATIONAL NUMBER?**

An IRRATIONAL NUMBER is a number that cannot be written as a fraction another side a rational number can be expressed as a simple fraction.

**Story: Hippasus √2**

According to one story, Hippasus was toying with the number √2, attempting to find the value or equivalent fraction. after some times he came to realized that no such fraction existed and √2 is an irrational number. Hippasus overjoyed by his discovery but Pythagos was not. Exsistance of irrational number brought Pythagoras theory into questionable as Pythagoras defined the universe in term of rational number.