## How to Calculate the Value of e

ver wonder how the calculator seems to know the numeric value of $e$ ?  How could it possibly know?  $e$ is an Irrational Number which means its decimals don’t repeat! (Specifically $e$ is a Transcendental Number but it falls under the category of an irrational number).  So how can you fit an infinitely large number in a small box?  Or for that matter, how did Leonhard Euler manage to calculate $e$ to 23 decimal places without a calculator?