Fekete–Szegö properties for quasi-subordination class of complex order defined by Sălăgean operator.

In this paper, we introduce the class M b , λ , n q (φ , ϕ) of quasi subordinations defined by Sălăgean operator, which generalizes known classes and contains new classes. Also we will obtain the coefficient bounds for functions belonging to the class M b , λ , n q (φ , ϕ). A number of known or new results are shown to follow upon specializing the parameters involved in our main results. [ABSTRACT FROM AUTHOR]