Hankel inequalities for bounded turning functions in the domain of cosine Hyperbolic function

被引:9
作者
Khan, Muhammmad Gha ff ar [1 ]
Mashwani, Wali Khan [1 ]
Shi, Lei [2 ]
Araci, Serkan [3 ]
Ahmad, Bakhtiar [4 ]
Khan, Bilal [5 ]
机构
[1] Kohat Univ Sci & Technol, Inst Numer Sci, Kohat, Pakistan
[2] Anyang Normal Univ, Sch Math & Stat, Anyang 455002, Peoples R China
[3] Hasan Kalyoncu Univ, Fac Engn, Dept Basic Sci, TR-27010 Gaziantep, Turkiye
[4] Govt Degree Coll Mardan, Mardan, Pakistan
[5] East China Normal Univ, Sch Math Sci, 500 Dongchuan Rd, Shanghai 200241, Peoples R China
来源
AIMS MATHEMATICS | 2023年 / 8卷 / 09期
关键词
holomorphic functions; Hankel determinant; Subordination; Hyperbolic function; STARLIKE FUNCTIONS; DETERMINANT; COEFFICIENT; SUBCLASS;
D O I
10.3934/math.20231121
中图分类号
O29 [应用数学];
学科分类号
070104 ;
摘要
In the present article, we define and investigate a new subfamily of holomorphic functions connected with the cosine hyperbolic function with bounded turning. Further some interesting results like sharp coefficients bounds, sharp Fekete-Szego estimate, sharp 2(nd) Hankel determinant and non-sharp 3(rd) order Hankel determinant. Moreover, the same estimates have been investigated for 2-fold, 3-fold symmetric functions, the first four initial sharp bounds of logarithmic coefficient and sharp second Hankel determinant of logarithmic coefficients fort his defined function family.
引用
收藏
页码:21993 / 22008
页数:16
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