2015.07.24 13:20
실적년도 | 2015년 |
---|---|
논문구분 | 국외 |
총저자 | Eungil Ko, Sungeun Jung, Yoenha Kim |
학술지명 | Applied Mathematics and Computation |
권(Vol.) | 261 |
호(No.) | |
게재년월 | 2015년 6월 |
Impact Factor | 1.551(JCR2014) |
SCI 등재 | SCIE등재 |
비고 |
For ananalytic function ϕ:D→D, the composition operator Cϕ is the operator on the Hardy space H2 defined by Cϕf=f◦ϕ for all f in H2. In this paper, we give necessary and sufficient conditions for the composition operator Cϕ to be binormal where the symbol ϕ is a linear fractional self map of D. Furthermore,we show that Cϕ is binormal if and only if it is centered when ϕ is an automorphism of D or ϕ(z)=sz+t, |s|+|t| <= 1. We also characterize several properties of binormal composition operators with linear fractional symbols on H2.