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"Chongkai Zhu" <mathematica@xxxxxxxxx> writes: > What if we know (exactly) a number is an imaginary number, but only > know ineaxtly it's magnitude? "0+1.0i" seems nature. Yes, but Scheme doesn't provide this. Scheme's numeric system doesn't allow for "partial exactness". It's not special for complex numbers; the same could be true for rationals: what if the numerator is known exactly, and the denominator inexactly? Thomas