Transcription of 1 Complex algebra and the complex plane
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Topic 1 NotesJeremy Orloff1 Complex algebra and the Complex planeWe will start with a review of the basic algebra and geometry of Complex numbers. Mostlikely you have encountered this previously in or MotivationThe equationx2= 1 has no real solutions, yet we know that this equation arises naturallyand we want to use its roots. So we make up a new symbol for the roots and call it acomplex symbols iwill stand for the solutions to the equationx2= 1. We willcall these new numbers Complex numbers. We will also write 1 = iNote: Engineers typically usejwhile mathematicians and physicists usei.
The basic arithmetic operations follow the standard rules. All you have to remember is that i2 = 1. We will go through these quickly using some simple examples. It almost goes without saying that in 18.04 it is essential that you become uent with these manipulations. Addition: (3 + 4i) + (7 + 11i) = 10 + 15i Subtraction: (3 + 4i) (7 + 11i) = 4 7i
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