Region of variability for spiral-like functions with respect to a boundary point
For μ ∈ ℂ such that Re μ > 0 let denote the class of all non-vanishing analytic functions f in the unit disk with f(0) = 1 and in . For any fixed z₀ in the unit disk, a ∈ ℂ with |a| ≤ 1 and λ ∈ ̅, we shall determine the region of variability V(z₀,λ) for log f(z₀) when f ranges over the class . In the final section we graphically illustrate the region of variability for several sets of parameters.