A certain subclass of analytic functions in the open unit disc with
negative coefficients is introduced. The new class is defined by
means of multiplier transformations. By making use of the familiar
concept of neighborhoods of analytic function, the author proves
coefficient inequalities, distortion theorems and associated
inclusion relations for the $(n,\delta)$-neighborhoods of functions
belonging to the new class, which satisfy a certain nonhomogeneous
Cauchy-Euler differential equation.
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