tailieunhanh - Báo cáo hóa học: " Radius properties for analytic and p-valently starlike functions"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Radius properties for analytic and p-valently starlike functions | Uyanik and Owa Journal of Inequalities and Applications 2011 2011 107 http content 2011 1 107 RESEARCH Journal of Inequalities and Applications a SpringerOpen Journal Open Access Radius properties for analytic and p-valently starlike functions Neslihan Uyanik1 and Shigeyoshi Owa2 Correspondence owa@math. department of Mathematics Kinki University Higashi-Osaka Osaka 577-8502 Japan Full list of author information is available at the end of the article Abstract Let Ap be the class of functions f z which are analytic in the open unit disk U and satisfy fZz ze U . Also let Sp a denotes the subclass of Ap consisting of f z which are p-valently starlike of order a 0 a p . A new subclass Up x of Ap is introduced by z2 zp 1 f z 1 z Ằ z e U for some real l 0. The object of the present paper is to consider some radius properties for f z e Sp a such that 8 f 8z e Up Ằ . 2010 Mathematics Subject Classification Primary 30C45. Keywords Analytic radius problem Cauchy-Schwarz inequality p-valently starlike of order a. 1 Introduction Let Ap be the class of functions f z of the form oo f z zp anZn p 1 2 3 . which are analytic in the open unit disk U z e C z 1 and satisfy zp f 1 Ị2 bnzn p 0 z e U . For f z e Ap we say thatf z belongs to the class Up x if it satisfies z2 zp 1 f z 1 z Ằ z e U for some real number l 0. Let us consider a function fs z given by zp fs z z t 8 e R . 1 - z Springer 2011 Uyanik and Owa licensee Springer. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http licenses by which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Uyanik and Owa Journal of Inequalities and Applications 2011 2011 107 http content 2011 1 107 Page 2 of 7 Then we can write that f z 1 E 1 az zp with and z2 an zp-1 fs z co 52 n - 1

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