Abstract
For β < 1, let 𝒫β denote the class of normalized analytic functions whose derivatives have real part greater than β. Recently, Fournier and Ruscheweyh [5] developed a method for finding the best (least) bound β such that a certain integral operator V λ maps the class 𝒫β into the familiar class 𝒮* of starlike functions in the unit disk. The main object of this paper is to show how their method can be made more readily available for several other classes of integral operators. *E-mail: jllimath@nwpu.edu.cn
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