Estimates of initial coefficients for certain subclasses of bi-univalent functions involving quasi-subordination


Authors

Obaid Algahtani - Department of Mathematics, College of Science, King Saud University, P. O. Box 231428, Riyadh 11321, Saudi Arabia.


Abstract

The object of the present paper is to introduce and investigate new subclasses of the function class \(\Sigma\) of bi-univalent functions defined in the open unit disk U, involving quasi subordination. The coefficients estimate \(|a_2|\) and \(|a_3|\) for functions in these new subclasses are also obtained.


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