Symmetry (Jul 2020)

The Fifth Coefficient of Bazilevič Functions

  • Oh Sang Kwon,
  • Derek Keith Thomas,
  • Young Jae Sim

DOI
https://doi.org/10.3390/sym12081228
Journal volume & issue
Vol. 12, no. 8
p. 1228

Abstract

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Let f∈A, the class of normalized analytic functions defined in the unit disk D, and be given by f(z)=z+∑n=2∞anzn for z∈D. This paper presents a new approach to finding bounds for |an|. As an application, we find the sharp bound for |a5| for the class B1(α) of Bazilevič functions when α≥1.

Keywords