>>>>No argument on that. But i=sqrt(-1) is what is (at least when I taught math) commonly used as a tool to explain to 'non-math' people what the imaginary part of a non-real quadratic solution is...
>>>
>>>Weeeeellll... You can always try to explain to non-math people (like me) what is an "imaginary part of a non-real quadratic solution" is... :-)
>>
>>See, I knew we should have a math section (s). Suppose you have a quadratic equation in x, and using the previous formula, you get the solution of x = 6 +/- sqrt(-5). The imaginary part is the sqrt(-5), often expressed as sqrt(5)i. 6 is the 'real' part. 'Imaginary' is sort of a term conjured up to indicate it can't be expressed on the real x/y plane...
>
>On the other hand:
>There's four fingers and a Thumb.

You really mean that? :-) Gee, you're smart! :-)