Fourth Hankel determinant for a subclass of starlike functions based on modified sigmoid (Q2064429)
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scientific article; zbMATH DE number 7452493
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | Fourth Hankel determinant for a subclass of starlike functions based on modified sigmoid |
scientific article; zbMATH DE number 7452493 |
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Fourth Hankel determinant for a subclass of starlike functions based on modified sigmoid (English)
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5 January 2022
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Summary: In our present investigation, we obtain the improved third-order Hankel determinant for a class of starlike functions connected with modified sigmoid functions. Further, we investigate the fourth-order Hankel determinant, Zalcman conjecture, and also evaluate the fourth-order Hankel determinants for 2-fold, 3-fold, and 4-fold symmetric starlike functions.
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star-like functions
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Hankel determinant
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coefficient estimates
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