OH CERTAIN CLASS OF UNIVALENT FUNCTIONS DEFINED BY CONVOLUTION OPERATOR MADE BY HYPERGEOMETRIC FUNCTION

摘要

In this paper, we introduce the class A(a, b, c, o, A, B, (3) defined by convolution operator H_(a,b,c)(f)(Z)=z-~/Σ_(n=2)/(a)_(n-1)(b)_(n-1)/(C)_(n-1)(n-1)!a_nZ~n where (a)_n=Γ(a+n)/Γ(a),c > b > 0 and C > a+b. We study in this paper coefficient estimates,