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18.03 LECTURE NOTES, SPRING 2014

LECTURE NOTES, SPRING 2014 . BJORN POONEN. 7. complex numbers complex numbers are expressions of the form x + yi, where x and y are real numbers, and i is a new symbol. Multiplication of complex numbers will eventually be defined so that i2 = 1. (Electrical engineers sometimes write j instead of i, because they want to reserve i for current, but everybody else thinks that's weird.) Just as the set of all real numbers is denoted R, the set of all complex numbers is denoted C. Flashcard question: Is 9 a real number or a complex number ?

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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