>>>Quite right, R is a subset of C, C is form a +/- bi where a,b are real, i=sqrt(-1), and b=0 for R (real), etc.
>>
>>The definition for i: i**2=-1. Because sqrt is not defined on negative numbers.
>>
>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... :-)
Alexandre Nobre
Alpha Bytes Computer Corp.
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