Published Online: Jan 11, 2019
Page range: 19 - 26
DOI: https://doi.org/10.2478/jamsi-2018-0010
Keywords
© 2019 M. Darus, Saumya Singh, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
In the present paper, we introduce and investigate two new subclasses QΣ(n; y;k) and BΣ(n;β;k) of bi-valent functions in the unit disk U. For functions belonging to the classes QΣ(n;y;k) and BΣ(n;β;k), we obtain estimates on the first two Taylor-Maclaurin coefficients |a2| and |a3|.