Complex number - Wikipedia
https://en.wikipedia.org/wiki/Complex_numberA complex number is a number of the form a + bi, where a and b are real numbers, and i is an indeterminate satisfying i = −1. For example, 2 + 3i is a complex number. This way, a complex number is defined as a polynomialwith real coefficients in the single indeterminate i, for which the relation i + 1 = 0 is imposed. Based on …