Andrei, Loriana A differential sandwich-type result using an extended generalized Sălăgean operator and extended Ruscheweyh operator. (English) Zbl 1314.30016 Transylv. J. Math. Mech. 6, No. 1, 1-8 (2014). 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. MSC: 30C45 Special classes of univalent and multivalent functions of one complex variable (starlike, convex, bounded rotation, etc.) Keywords:strong differential subordination; Ruscheweyh derivative PDF BibTeX XML Cite \textit{L. Andrei}, Transylv. J. Math. Mech. 6, No. 1, 1--8 (2014; Zbl 1314.30016) OpenURL