Communications of the Korean Mathematical Society (대한수학회논문집)

Korean Mathematical Society (대한수학회)
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SOME RESULTS CONCERNED WITH HANKEL DETERMINANT FOR 𝓝 (𝜶) CLASS

  • Received : 2020.08.20
  • Accepted : 2021.02.19
  • Published : 2021.10.31
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Abstract

In this paper, we give some results an upper bound of Hankel determinant of H2(1) for the classes of 𝓝 (𝜶). We get a sharp upper bound for H2(1) = c3 - c22 for 𝓝 (𝜶) by adding z1, z2, …, zn zeros of f(z) which are different than zero. Moreover, in a class of analytic functions on the unit disc, assuming the existence of angular limit on the boundary point, the estimations below of the modulus of angular derivative have been obtained. Finally, the sharpness of the inequalities obtained in the presented theorems are proved.

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References

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