My notes state that (a,b) · (c,d) = (ac − bd,ad + bc). This does not work when a = 1, b = 2, c = 3, d = 4. Does that multiplication make sense to anyone? How is it true?
My notes state that (a,b) · (c,d) = (ac − bd,ad + bc). This does not work when a = 1, b = 2, c = 3, d = 4. Does that multiplication make sense to anyone? How is it true?
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