NEIGHBORHOODOF A CLASS OFANALYTIC FUNCTIONS WITH NEGATIVECOEFFICIENTS DEFINED BYTHE GENERALIZED RUSCHGWEEDERIVANDES IBGCLVING V GEHEOALFDGFIONAL D^OI^^VBI^EG^^R^A^C^G.

By making use of the familiar concept of neighborhoods of analytic functions, we prove several inclusion relations associated with the (n, σ-neighborhoods of various subclasses of starlike and convex functions of complex order defined by the generalized Ruscheweyh derivative involving a general fractional derivative operator. Special cases of some of these inclusion relations are shown to yield known results.