Partial Sums of Generalized Class of Analytic Functions Involving Hurwitz-Lerch Zeta Function.

Let f_n(z) = z + ∑Due to image rights restrictions, multiple line equation(s) cannot be graphically displayed. a_kz^k be the sequence of partial sums of the analytic function f(z) = z + ∑ Due to image rights restrictions, multiple line equation(s) cannot be graphically displayed.a_kz^k. In this paper, we determine sharp lower bounds for 핹{f'(z)/f_n(z)},핹{f_n(z)/f(z)}, 핹{f'(z)/fDue to image rights restrictions, multiple line equation(s) cannot be graphically displayed.(z)}, and 핹{fDue to image rights restrictions, multiple line equation(s) cannot be graphically displayed.(z)/f'(z)}. The usefulness of the main result not only provides the unification of the results discussed in the literature but also generates certain new results. [ABSTRACT FROM AUTHOR]