Lecture 1 Complex Numbers - 4unitmaths.com

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Lecture 1 Complex Numbers Definitions. Let i2 = −1. ∴ i = −1. Complex numbers are often denoted by z. Just as R is the set of real numbers, C is the set of complex numbers.Ifz is a complex number, z is of the form z = x+ iy ∈ C, for some x,y ∈ R. e.g. 3 + 4i is a complex number. z = x+ iy real part imaginary part.

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