To a nonmathematician, having the letter "i" represent a number that does not quite exist and is "imaginary" can be hard to wrap your head around. If you open your mind to this way of thinking, ...

The square root of a negative number could easily be regarded as a curious mathematical construction that has little bearing on real life. Indeed, the French polymath René Descartes gave such numbers ...

The bailout plan for Greece will ring-fence about $55 billion euros worth of Greek assets. Photo / AP Mathematicians use "imaginary numbers" for abstract concepts such as the square root of -1 (which, ...