Abstract

In particular we shall first determine a radius of univalence for the normalized Bessel functions [J,(z) ]1Iv for values of v belonging to the region G defined by the inequalities (i v} >0, I arg v| <7r/4. Then we shall determine the radius of univalence of the functions z1-vJ,(z) for values of v belonging to a subset of the closure of G. When v is real and positive we shall determine the exact radius of star-likeness of both of the above-mentioned classes of normalized Bessel functions. Our results concerning the functions zl-vJ(z) sharpen those of Kreyszig and Todd [I] when v_ 0 and extend their results for complex values of v.

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