On Some Normality-Like Properties and Bishop's Property () for a Class of Operators on Hilbert Spaces
Author(s) -
Sid Ahmed Ould Ahmed Mahmoud
Publication year - 2012
Publication title -
international journal of mathematics and mathematical sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 39
eISSN - 1687-0425
pISSN - 0161-1712
DOI - 10.1155/2012/975745
Subject(s) - mathematics , invertible matrix , operator (biology) , invariant subspace , pure mathematics , finite rank operator , unitary operator , property (philosophy) , invariant (physics) , hilbert space , quasinormal operator , reflexive operator algebra , shift operator , multiplication operator , subspace topology , compact operator , linear subspace , mathematical analysis , mathematical physics , banach space , philosophy , repressor , chemistry , computer science , biochemistry , epistemology , transcription factor , programming language , extension (predicate logic) , gene
We prove some further properties of the operator ∈[QN](-power quasinormal, defined in Sid Ahmed, 2011). In particular we show that the operator∈[QN] satisfying the translation invariant property is normal and that theoperator ∈[QN] is not supercyclic provided that it is not invertible. Also, westudy some cases in which an operator ∈[2QN] is subscalar of order ; that is, it issimilar to the restriction of a scalar operator of order to an invariant subspace
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