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Verification of Brannan and Clunie's conjecture for certain subclasses of bi-univalent functions

S. SivasubramanianR. SivakumarS. KanasSeong-A Kim — 2015

Annales Polonici Mathematici

Let σ denote the class of bi-univalent functions f, that is, both f(z) = z + a₂z² + ⋯ and its inverse f - 1 are analytic and univalent on the unit disk. We consider the classes of strongly bi-close-to-convex functions of order α and of bi-close-to-convex functions of order β, which turn out to be subclasses of σ. We obtain upper bounds for |a₂| and |a₃| for those classes. Moreover, we verify Brannan and Clunie’s conjecture |a₂| ≤ √2 for some of our classes. In addition, we obtain the Fekete-Szegö relation...

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