Acta mathematica scientia,Series A
• Articles • Previous Articles Next Articles
Peng Zhigang
Received:
Revised:
Online:
Published:
Contact:
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:
Peng Zhigang. The Properties of Several Classes of Analytic Functions with Missing Coefficients[J].Acta mathematica scientia,Series A, 2008, 28(4): 661-669.
0 / / Recommend
Add to citation manager EndNote|Reference Manager|ProCite|BibTeX|RefWorks
URL: http://121.43.60.238/sxwlxbA/EN/
http://121.43.60.238/sxwlxbA/EN/Y2008/V28/I4/661
Cited
A Note on a Discrete Schrodinger Spectral Problem
The Existence of Positive Solutions to Boundary Value Problems
of Second Order Singular Differential Equations