A Subclass of Analytic Functions Associated with the Hurwitz-Lerch Zeta Function

A Subclass of Analytic Functions Associated with the Hurwitz-Lerch Zeta Function

Making use of a convolution operator involving the Hurwitz-Lerch Zeta function, we introduce a new class of analytic functions PT(λ, α, β) defined in the open unit disc, and investigate its various characteristics. Further we obtained distortion bounds, extreme points and radii of close-to-convexity, starlikeness and convexity for functions belonging to the class PT(λ, α, β).

___

  • Alexander, J. W. Functions which map the interior of the unit circle upon simple regions, Ann. of Math. 17, 12–22, 1915.
  • Altintas, O. A subclass of analytic functions with negative coefficients, Hacettepe Univ. Bull. Nat. Sciences & Engineering 19, 15–24, 1990.
  • Bernardi, S. D. Convex and starlike univalent functions, Trans. Amer. Math. Soc. 135, 429–446, 1969. [4] Choi, J. and Srivastava, H. M. Certain families of series associated with the Hurwitz-Lerch Zeta function, Appl. Math. Comput. 170, 399–409, 2005.
  • Ferreira, C. and L´opez, J. L. Asymptotic expansions of the Hurwitz-Lerch Zeta function, J. Math. Anal. Appl. 298, 210–224, 2004.
  • Flett, T. M. The dual of an inequality of Hardy and Littlewood and some related inequalities, J. Math. Anal. Appl. 38, 746–765, 1972.
  • Garg, M., Jain, K. and Srivastava, H. M. Some relationships between the generalized Apostol- Bernoulli polynomials and Hurwitz-Lerch Zeta functions, Integral Transform. Spec. Funct. 17, 803–815, 2006.
  • Jung, I. B., Kim, Y. C. and Srivastava, H. M. The Hardy space of analytic functions asso- ciated with certain one-parameter families of integral operators, J. Math. Anal. Appl. 176, 138–147, 1993. [9] Owa, S. and Lee, S. K. Certain generalized class of analytic functions with negative coeffi- cients, Bull. Cal. Math. Soc. 82, 284–289, 1990.
  • Lin, S. -D. and Srivastava, H. M. Some families of the Hurwitz-Lerch Zeta functions and associated fractional derivative and other integral representations, Appl. Math. Comput. 154, 725–733, 2004.
  • Lin, S. -D., Srivastava, H. M. and Wang, P. -Y. Some expansion formulas for a class of generalized Hurwitz-Lerch Zeta functions, Integral Transform. Spec. Funct. 17, 817–827, 2006.
  • Prajapat, J. K. and Goyal, S. P. Applications of Srivastava-Attiya operator to the classes of strongly starlike and strongly convex functions, J. Math. Inequal. 3, 129–137, 2009.
  • Riaducanu, D. and Srivastava, H. M. A new class of analytic functions defined by means of a convolution operator involving the Hurwitz-Lerch Zeta function, Integral Transform. Spec. Funct. 18, 933–943, 2007.
  • Silverman, H. Univalent functions with negative coefficients, Proc. Amer. Math. Soc. 51, 109–116, 1975. [15] Srivastava, H. M. and Attiya, A. A. An integral operator associated with the Hurwitz-Lerch Zeta function and differential subordination, Integral Transform. Spec. Funct. 18, 207–216, 2007.
  • Srivastava, H. M. and Choi, J. Series associated with the Zeta and related functions (Kluwer Academic Publishers, Dordrecht, Boston, London, 2001).