The Greek letter 'pi' (π) is a unique number and is defined as the ratio of a circle's circumference to its diameter. This number is independent of the size of a circle and for all practical purposes its approximate value is taken as 22/7 or 3.1416. In fact, the fraction 22/7 is slightly greater in value than 'pi'.
For many centuries mathematicians have been fascinated by it's unique characteristic. The strangest thing about this number is that nobody has been able to calculate its exact value. Computer scientists have now computed pi to over one million decimal places. At one time the scientists tried to prove that 'pi' was a fraction. When any fraction is written in decimal number, the same digits always appear over and over again in a special pattern. If 'pi' were a fraction, there would be a repeating pattern in 'pi' could not be found. Finally in 1761, a Swiss Mathematician named Johann Herrich Lambert settled the matter. He proved that pi is not a fraction.
The mathematicians are still engaged in research in this direction to see if the digits are arranged in any special way.
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