Sharp bounds of logarithmic coefficients for a class of univalent functions

Let U(α, λ), 0 < α < 1, 0 < λ < 1, be the class of functions f(z) = z + a2z2 + a3z3 + ・ ・ ・ satisfying |(z/f(z))1+α f ′(z) − 1|< λ in the unit disc D. For f ∈ U(α, λ) we give sharp bounds of its initial logarithmic coefficients γ1, γ2, γ3.