Reply to Re: I gave up to the Computers National Olimpiad
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Crappy tutor you had, or at least crappy in non-elementary algebra (elementary algebra as in my other post). A good mathematician would, with a correct definition of imaginary number (which is exactly the same as complex number), say i and -i are logical answers to x^2 = -1.
Probably what he meant are computable numbers, which are real number (math def) per definition. Check this: Computable numbers.
Probably what he meant are computable numbers, which are real number (math def) per definition. Check this: Computable numbers.
