ON PARTIAL SOLUTIONS TO CONJECTURES FOR RADIUS PROBLEMS INVOLVING LEMNISCATE OF BERNOULLI

被引:0
作者
Kaur, Gurpreet [1 ]
机构
[1] Univ Delhi, Mata Sundri Coll Women, Dept Math, Delhi 110002, India
来源
KOREAN JOURNAL OF MATHEMATICS | 2023年 / 31卷 / 04期
关键词
radius problem; lemniscate of Bernoulli; starlike function; positive real part; convex function; STARLIKENESS; SUBCLASS; UNIVALENCE;
D O I
10.11568/kjm.2023.31.4.433
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
Given a function f analytic in open disk centred at origin of radius unity and satisfying the condition |f(z)/g(z)-1|<1 for a analytic function g with certain prescribed conditions in the unit disk, radii constants Rare determined for the values of R z f '(Rz)/f(Rz) to lie inside the domain enclosed by the curve|w(2)-1|= 1 (lemniscate of Bernoulli). This, in turn, provides a partial solution to the conjectures and problems for determination of sharp bounds R for such functions f
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收藏
页码:433 / 444
页数:12
相关论文
共 35 条
[1]  
Ali RM, 2013, B MALAYS MATH SCI SO, V36, P23
[2]   DIFFERENTIAL SUBORDINATION FOR FUNCTIONS ASSOCIATED WITH THE LEMNISCATE OF BERNOULLI [J].
Ali, Rosihan M. ;
Cho, Nak Eun ;
Ravichandran, V. ;
Kumar, S. Sivaprasad .
TAIWANESE JOURNAL OF MATHEMATICS, 2012, 16 (03) :1017-1026
[3]   Radii of starlikeness associated with the lemniscate of Bernoulli and the left-half plane [J].
Ali, Rosihan M. ;
Jain, Naveen K. ;
Ravichandran, V. .
APPLIED MATHEMATICS AND COMPUTATION, 2012, 218 (11) :6557-6565
[4]  
[Anonymous], 1973, Bull. Inst. Math. Acad. Sinica
[5]  
[Anonymous], 1997, Complex Variables Theory Appl.
[6]   On fourth Hankel determinant for functions associated with Bernoulli's lemniscate [J].
Arif, Muhammad ;
Umar, Sadaf ;
Raza, Mohsan ;
Bulboaca, Teodor ;
Farooq, Muhammad Umar ;
Khan, Hasan .
HACETTEPE JOURNAL OF MATHEMATICS AND STATISTICS, 2020, 49 (05) :1777-1787
[7]  
Arora K, 2022, B KOREAN MATH SOC, V59, P993
[8]  
Azeem Raza M., 2013, J Powder Metall Min S, V1, P1, DOI DOI 10.1186/1029-242X-2013-412
[9]   RADII OF STARLIKENESS OF CERTAIN CLASSES OF ANALYTIC FUNCTIONS [J].
CAUSEY, WM ;
MERKES, EP .
JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS, 1970, 31 (03) :579-&
[10]   Radius Problems for Starlike Functions Associated with the Sine Function [J].
Cho, N. E. ;
Kumar, V. ;
Kumar, S. S. ;
Ravichandran, V. .
BULLETIN OF THE IRANIAN MATHEMATICAL SOCIETY, 2019, 45 (01) :213-232