On some new subclass of bi-univalent functions associated with the Opoola differential operator

By applying Opoola differential operator, in this article, two new subclasses M μ , β H , σ ( m , ψ , k , τ ) and M μ , β H , σ ( m , ξ , k , τ ) of bi-univalent functions class H defined in ▽ are introduced and investigated. The estimates on the coefficients | l 2 | and | l 3 | for functions of the classes are also obtained.