Define Complex Number And Equality Relation

define complex number. and equality relation.

graph TB A[Complex Number] --> B[Real Part] A --> C[Imaginary Part] B --> D[i, where i^2 = -1] C --> E[i, where i^2 = -1] F[Equality Relation] --> G[Two complex numbers are equal if and only if both their real and imaginary parts are equal]