Bohr Radius for Certain Analytic Functions

For an analytic self-mapping f (z) = Sigma(infinity)(n=0) a(n)z(n) of the unit disk D, it is well-known that Sigma(infinity)(n=0) vertical bar a(n)vertical bar vertical bar z vertical bar(n) <= 1 for vertical bar z vertical bar <= 1/3 and the number 1/3, known as the Bohr radius for the class of analytic self-mappings of D, is sharp. We have obtained the Bohr radius for the class of a-spiral functions of order rho and the Bohr radius for the class of analytic functions f defined on the unit disk satisfying the differential subordination f (z) + beta zf' (z) + gamma z(2) f ''(z) < h(z).