18.03 LECTURE NOTES, SPRING 2014
18.03 LECTURE NOTES, SPRING 2014 BJORN POONEN 7. Complex numbers Complex numbers are expressions of the form x+ yi, where xand yare real numbers, and iis a new symbol. Multiplication of complex numbers will eventually be de ned so that i2 = 1. (Electrical engineers sometimes write jinstead of i, because they want to reserve i
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