Certain Conditions for Strongly Starlike and Strongly Convex Functions

In the present paper, we investigate a differential subordination involving multiplier transformation related to a sector in the open unit disk E = {z : |z| < 1}. As special cases to our main result, certain sufficient conditions for strongly starlike and strongly convex functions are obtained.




References:
[1] R. Aghalary, R. M. Ali, S. B. Joshi and V. Ravichandran, Inequalities for
analytic functions defined by certain linear operators, Int. J. Math. Sci.,
4(2005), 267-274.
[2] N. E. Cho and T. H. Kim, Multiplier transformations and strongly closeto-
convex functions, Bull. Korean Math. Soc., 40(2003), 399-410.
[3] N. E. Cho and H. M. Srivastava, Argument estimates of certain analytic
functions defined by a class of multiplier transformations, Math. Comput.
Modelling, 37(2003), 39-49.
[4] Jian Li and S. Owa, Properties of the S╦ÿal╦ÿagean operator, Georgian Math.
J., 5(4)(1998), 361-366.
[5] S. S. Miller and P. T. Mocanu, Marx-Strohh¨acker differential subordination
systems, Proc. Amer. Math. Soc., 99(1987), 527-534.
[6] Gh. Oros, A Condition for Starlikeness, General Mathematics, 7(1999),
1-6.
[7] S. Owa, C. Y. Shen and M. Obradovi'c, Certain subclasses of analytic
functions, Tamkang J. Math., 20(1989), 105-115.
[8] G. S. S╦ÿal╦ÿagean, Subclasses of univalent functions, Lecture Notes in Math.,
1013, 362-372, Springer-Verlag, Heideberg, 1983.
[9] B. A. Uralegaddi, Certain subclasses of analytic functions, New Trends In
Geometric Functions Theory and Applications. (Madras, 1990) 159-161,
World Scientific Publishing Company, Singapore, New Jersey, Londan
and Hong Kong, 1991.