Briot-Bouquet differential subordination and Bernardi's integral operator

preprint2021arXivOpen access

Abstract

The conditions on AA, BB, ββ and γγ are obtained for an analytic function pp defined on the open unit disc D\mathbb{D} and normalized by p(0)=1p(0)=1 to be subordinate to (1+Az)/(1+Bz)(1+Az)/(1+Bz), −1≤B<A≤1-1\leq B<A \leq 1 when p(z)+zp′(z)/(βp(z)+γ)p(z)+ zp'(z)/(βp(z)+γ) is subordinate to eze^{z}. The conditions on these parameters are derived for the function pp to be subordinate to 1+z\sqrt{1+z} or eze^{z} when p(z)+zp′(z)/(βp(z)+γ)p(z)+ zp'(z)/(βp(z)+γ) is subordinate to (1+Az)/(1+Bz)(1+Az)/(1+Bz). The conditions on ββ and γγ are determined for the function pp to be subordinate to eze^{z} when p(z)+zp′(z)/(βp(z)+γ)p(z)+ zp'(z)/(βp(z)+γ) is subordinate to 1+z\sqrt{1+z}. Related result for the function p(z)+zp′(z)/(βp(z)+γ)p(z)+ zp'(z)/(βp(z)+γ) to be in the parabolic region bounded by the Re⁡w=∣w−1∣\operatorname{Re} w=|w-1| is investigated. Sufficient conditions for the Bernardi's integral operator to belong to the various subclasses of starlike functions are obtained as applications

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