Geometric interpretation of a complex function.
If D is the domain of real-valued functions and u(x,y) and v(x,y) then the system of equations u = u(x,y) and v = v(x,y) describes a transformation (or mapping) from the x y - plane into the u v -plane, also called the w-plane.
Therefore, we consider the function w= f(z) = u(x,y) + i v (x,y)
to be a transformation (or mapping) from the set D in the z-plane onto the range R in the w-plane.
A function f: C → C is conformal at a point z₀ if and only if it is holomorphic and its derivative is everywhere non-zero on C.
i.e., if f is analytic at z₀ and f’(z₀) ≠ 0
An isogonal mapping is a transformation w = f (z) that preserves the magnitudes of local angles, but not their orientation.
- Maps of the form z → z + k, where k є C
• Magnification and rotation
- Maps of the form z → k z , where k є C
- Maps of the form z → 1 / z