Bounds of Hankel determinant for a class of univalent functions

摘要

The authors study the coefficient condition for the class H_α defined as the family of analytic functions f, f (0) = 0 and f′ (0) = 1, which satisfy ?[(1-α) f′(z) +α(1+(zf″(z))/(f′(z)))] > α, z~∈ E, where α is a real number.