Notation
$ a+bi $ where a and b are real numbers, and i is the imaginary unit, which has the property $ i^2 = -1 $. The real number a is called the real part of the complex number, and the real number b is the imaginary part.
Complex Arithmetic
Addition and Subtraction $ (a + bi) + (c + di) = (a + c) + (b + d)i $ $ (a + bi) - (c + di) = (a - c) + (b - d)i $
