English

On Third-Order Determinant Bounds for the class $\mathcal{S}^*_{B}$

Complex Variables 2026-03-12 v1

Abstract

This paper deals with sharp bounds for the third-order Hankel, Toeplitz and Hermitian-Toeplitz determinant of functions belonging to the class SB\mathcal{S}^*_{B} of starlike functions associated with a balloon-shaped domain, given by SB={fA:zf(z)f(z)11log(1+z):=B(z),zD}. \mathcal{S}^{\ast}_{B}= \left\{ f \in \mathcal{A} : \frac{z f'(z)}{f(z)} \prec \frac{1}{1-\log (1+z)} :=B(z), \quad z \in \mathbb{D} \right\}. By applying coefficient inequalities and properties of these functions, we obtain sharp bounds for these determinants. The sharpness of the results is verified by constructing suitable extremal functions.

Keywords

Cite

@article{arxiv.2603.10513,
  title  = {On Third-Order Determinant Bounds for the class $\mathcal{S}^*_{B}$},
  author = {S. Sivaprasad Kumar and Arya Tripathi},
  journal= {arXiv preprint arXiv:2603.10513},
  year   = {2026}
}
R2 v1 2026-07-01T11:14:17.338Z