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Subscalarity of $k$-quasi-class $A$ operators


In this paper, we show that every $k$-quasi-class $A$ operator has a scalar extension and give some spectral properties of the scalar extensions of $k$-quasi-class $A$ operators. As a corollary, we get that such an operator with rich spectrum has a nontrivial invariant subspace.

Key words: Class $A$ operator, $k$-quasi-class $A$ operators, invariant subspace, subscalar.

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TitleSubscalarity of $k$-quasi-class $A$ operators
SourceMethods Funct. Anal. Topology, Vol. 25 (2019), no. 2, 177-188
MathSciNet MR3978681
MilestonesReceived 08/02/2019; Revised 02/03/2019
CopyrightThe Author(s) 2019 (CC BY-SA)

Authors Information

M. H. M. Rashid
Department of Mathematics, Faculty of Science P. O. Box(7), Mu’tah university, AlKarak-Jordan

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M. H. M. Rashid, Subscalarity of $k$-quasi-class $A$ operators, Methods Funct. Anal. Topology 25 (2019), no. 2, 177-188.


@article {MFAT1172,
    AUTHOR = {M. H. M. Rashid},
     TITLE = {Subscalarity of $k$-quasi-class $A$ operators},
   JOURNAL = {Methods Funct. Anal. Topology},
  FJOURNAL = {Methods of Functional Analysis and Topology},
    VOLUME = {25},
      YEAR = {2019},
    NUMBER = {2},
     PAGES = {177-188},
      ISSN = {1029-3531},
  MRNUMBER = {MR3978681},
       URL = {},


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