×

Upper bound on Hankel determinant for bounded turning function associated with Sălăgean-difference operator. (English) Zbl 1470.30015

Summary: By making use of Sălăgean-difference operator we introduce a new function class \(\mathcal{R}^\beta_\lambda(\alpha)\) which generalizes the class of functions of bounded turning of order alpha. We investigate upper bounds on the third Hankel determinant for the class \(\mathcal{R}^\beta_\lambda(\alpha)\). Our results generalize the results of earlier researchers in this direction.

MSC:

30C45 Special classes of univalent and multivalent functions of one complex variable (starlike, convex, bounded rotation, etc.)
30C50 Coefficient problems for univalent and multivalent functions of one complex variable