Have two minutes? Give the Lambda Calculus a shot right now!
If you're a beginner you can start with some basics:
x, y, a, and other letters!\x.x, \x.\y.x, and more!(\x.x) \z.z, (\x.\y.x) z q, and even (\x.x x) (\y.y y)!Hacked out in a night by Mike Burns. Thanks to Try Ruby and Try Haskell; and to jison and jquery-console. Learn more about the Lambda Calculus at Wikipedia.