A NEW SUBCLASS OF BI-UNIVALENT FUNCTIONS DEFINED BY q-DERIVATIVE

E. TOKLU

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Abstract

In this investigation we introduce, by making use of q-derivative operator, a new subclass which are an extension of some well-known subclasses of bi-univalent functions. Also, we give the upper bounds for the coecients ja2j and ja3j for the functions belonging to this new subclass and its subclasses.

Keywords

q-derivative, bi-univalent function, coecient inequality, subordination.