Mathematics – Complex Variables
Scientific paper
2012-04-03
Mathematics
Complex Variables
18 pages, submitted to a journal
Scientific paper
We obtain many subordination and superordination results, using a new operator Bc ?f by means of the normalized form of the generalized Bessel functions of ?rst kind, which is defined as z [B^c_(\kappa+1) f(z)]' = \kappaB^c_\kappa f(z) - (\kappa - 1)B^c_(\kappa+1)f(z) where b, c, p \in \mathbb{C} and \kappa = p + (b + 1)/2 \notin \mathbb{Z}^-_0 . These results are obtained by investigating appropriate class of admissible functions. Sandwich-type results are also obtained. Various known or new special cases of our results are also pointed out. Moreover we give a positive answer to an open problem proposed by Andra and Baricz [5].
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