====== Irrational numbers ======
{{tag>Unknowable}}

An irrational number is a real number that can't be expressed as a ratio of integers, i.e. as a fraction.

Put another way,// it can never be specified with absolute accuracy.//

Well known examples are  ** π ** and   **√2**

For many irrational numbers, relatively simple mathematical proofs exist which show that it's impossible to ever arrive at a finite solution. For example,  **√2**   was proved to be an irrational number by Greek mathematicians more than 2,000 years ago.

Further details at [[https://en.wikipedia.org/wiki/Irrational_number|Wikipedia]]