A SUFFICIENT CONDITION FOR STARLIKENESS OF ORDER α

We obtain a sufficient condition for starlikeness of order α, |f � (z)−λ(f (z)/z)+ λ − 1| <M = Mn(λ, α), where λ ∈ (0, 1), α ∈ (0, 1) and the function f( z)= z + an+1zn+1 + ··· is analytic in the unit disc U.