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The sharp bounds of the second and third Hankel determinants for the class 𝓢𝓛*
Mathematica Slovaca ( IF 0.654 ) Pub Date : 2020-07-24 , DOI: 10.1515/ms-2017-0398
Shagun Banga; S. Sivaprasad Kumar

In this paper, we use the novel idea of incorporating the recently derived formula for the fourth coefficient of Carathéodory functions, in place of the routine triangle inequality to achieve the sharp bounds of the Hankel determinants H3(1) and H2(3) for the well known class 𝓢𝓛* of starlike functions associated with the right lemniscate of Bernoulli. Apart from that the sharp bound of the Zalcman functional: |a32a5| for the class 𝓢𝓛* is also estimated. Further, a couple of interesting results of 𝓢𝓛* are also discussed.
更新日期:2020-08-09

 

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