Acta mathematica scientia,Series A

• Articles • Previous Articles     Next Articles

The Properties of Several Classes of Analytic Functions with Missing Coefficients

Peng Zhigang   

  1. (College of Mathematics and Computer Science, Hubei University, Wuhan 430062)
  • Received:2007-01-15 Revised:2008-05-15 Online:2008-08-25 Published:2008-08-25
  • Contact: Peng Zhigang

Abstract: Let A be the class of functions, which are analytic in the unit disc D={z:|z|<1}, with f (0)=f′(0)-1=0. Let S* be the set of starlike functions, S*={f (z)∈A, Re zf′(z) / f(z)>0, z D}. Let K be the set of convex functions, K={f(z) ∈ A, Re(1+zf’’(z) / f ’(z)>0, z∈ D}. P denotes the class of functions p(z), which are analytic in D and satisfy p(0)=1, Rep(z)>0. Let Pn={p(z): p(z)=1+anzn+an+1zn+1+… ∈ P}, S*n={f (z): f(z)=z+anzn+an+1zn+1+… ∈ S*}, Kn={ f(z): f (z)=z+anzn+an+1zn+1+ … ∈K}. LSn*={g(z)=ln f(z) / z, f ∈ Sn*}, where the logarithmic function satisfy ln1=0. In this article the author investigated the properties of the classes S*n, Kn and LSn*. The author obstained the extreme points and support points of LSn*, and discussed the extreme points and support points of S*n and Kn.

Key words: Topology of uniform convergence, Extreme point, Support point

CLC Number: 

  • 30C45
Trendmd