박상수
2017-01-18T02:01:35Z
2017-01-18T02:01:35Z
2007
0002-9939
OAK-4304
http://dspace.ewha.ac.kr/handle/2015.oak/234014
Several classes have been considered to study the weak subnormalities of Hilbert space operators. One of them is n-hypnormality, which comes from the Bram-Halmos criterion for subnormal operators. In this note we consider E(n)-hyponormality, which is the parallel version corresponding to the Embry characterization for subnormal operators. We characterize E(n)-hyponormality of composition operators via k-th Radon-Nikodym derivatives and present some examples to distinguish the classes. © 2007 American Mathematical Society.
English
Separating classes of composition operators via subnormal condition
Article
12
135
SCI
SCIE
SCOPUS
3955
3965
Proceedings of the American Mathematical Society
10.1090/S0002-9939-07-09003-X
WOS:000249641000023
2-s2.0-70549097249
Jung I.B.
Lee M.R.
Park S.S.
20170117155051