Subclasses of meromorphically multivalent functions defined by a differential operator

In this paper we introduce and study two new subclasses @S"@l"@m"m"p(@a,@b) and @S"@l"@m"m"p^+(@a,@b) of meromorphically multivalent functions which are defined by means of a new differential operator. Some results connected to subordination properties, coefficient estimates, convolution properties, integral representation and distortion theorems are obtained. We also extend the familiar concept of (n,@d)-neighborhoods of analytic functions to these subclasses of meromorphically multivalent functions.

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