A differential sandwich-type result using an extended generalized Sălăgean operator and extended Ruscheweyh operator. (English) Zbl 1314.30016

Summary: The purpose of this paper is to introduce sufficient conditions for strong differential subordination involving the extended derivative operator \(DR_\lambda^{m,n}\) and also to obtain sandwich-type result.


30C45 Special classes of univalent and multivalent functions of one complex variable (starlike, convex, bounded rotation, etc.)