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A Note on Some Equivalences of Operators and Topology of Invariant Subspaces

Received: 8 January 2018    Accepted: 7 February 2018    Published: 28 December 2018
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Abstract

In this paper we investigate the invariant and hyperinvariant subspace lattices of some operators. We give a lattice-theoretic description of the lattice of hyperinvariant subspaces of an operator in terms of its lattice of invariant subspaces. We also study the structure of these lattices for operators in certain equivalence classes of some equivalence relations.

Published in Mathematics and Computer Science (Volume 3, Issue 5)
DOI 10.11648/j.mcs.20180305.12
Page(s) 102-112
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This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Invariant Subspace, Reducing Subspace, Hyperinvariant, Hyper-Reducing, Commutant, Bicommutant, Reducible, Irreducible Operator

References
[1] H. Bercovici, C. Foias, and C. Pearcy, On the hyperinvariant subspace problem IV, Canadian J. Math. 60 (2008), 758-789.
[2] C. Foias, S. Hamid, C. Onica, and C. Pearcy, Hyperinvaraint subspaces III, J. Functional Anal. 222, No.1 (2005), 129-142.
[3] M. F. Gamal, contractions: A Jordan model and lattices of invariant subspaces, St. Petersburg Math Journal 15 (2004), 773-793.
[4] L. V. Harkrishan, Elements of Hilbert spaces and operators, Springer, Singapore, 2017.
[5] D. Herrero, Quasisimilarity does not preserve the hyperlattice, Proc. Amer. Math. Soc. 65, No.1 (1977), 80-84.
[6] T. B. Hoover, Operator algebras with reducing invariant subspaces, Paci_c J. of Math. 44 (1973), 173-179.
[7] L. Kerchy, On the hyperinvariant subspace problem for asymptotically nonvanishing contractions, Operator Theory: Advances and Applications 127 (2001), 399-422.
[8] C. S. Kubrusly, An introduction to models and decompositions in operator theory, Birkhauser, Boston, 1997.
[9] C. S. Kubrusly, Elements of operator theory, Birkhauser, Basel, Boston, 2001.
[10] C. S. Kubrusly, Hilbert space operators:A problem solving approach, Birkhauser, Basel, Boston, 2003.
[11] C. S. Kubrusly, On similarity to normal operators, Mediterranean J. of Math. (2016), 2073-2085.
[12] W. E. Longstaff, A lattice-theoretic description of the lattice of hyperinvariant subspaces of a linear transformation, Can. J. Math. XXVIII, No. 5 (1976), 1062-1066.
[13] Valentine Matache, Operator equations and invariant subspaces, Le Matematiche XLIX-Fasc. I (1994), 143-147.
[14] A. Mello and C. S. Kubrusly, Quasiaffinity and invariant subspaces, Archiv der Mathematik 107 (2016), 173-184.
[15] R. Moore, Hyperinvariant subspaces of reductive operators, Proc. American Mathematical Society 63, No. 1 (1977), 91-94.
[16] R. Moore, Reductive operators that commute with a compact operator, Michigan Math. J. 22 (1975), 229-233.
[17] M. Sababheh, A. Yousef and R. Khalil, On the invariant subspace problem, Bulletin of the Malaysian Math. Sci. Soc, April 2016, Vol. 39, Issue 2, 699-705.
Cite This Article
  • APA Style

    Bernard Mutuku Nzimbi. (2018). A Note on Some Equivalences of Operators and Topology of Invariant Subspaces. Mathematics and Computer Science, 3(5), 102-112. https://doi.org/10.11648/j.mcs.20180305.12

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    ACS Style

    Bernard Mutuku Nzimbi. A Note on Some Equivalences of Operators and Topology of Invariant Subspaces. Math. Comput. Sci. 2018, 3(5), 102-112. doi: 10.11648/j.mcs.20180305.12

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    AMA Style

    Bernard Mutuku Nzimbi. A Note on Some Equivalences of Operators and Topology of Invariant Subspaces. Math Comput Sci. 2018;3(5):102-112. doi: 10.11648/j.mcs.20180305.12

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  • @article{10.11648/j.mcs.20180305.12,
      author = {Bernard Mutuku Nzimbi},
      title = {A Note on Some Equivalences of Operators and Topology of Invariant Subspaces},
      journal = {Mathematics and Computer Science},
      volume = {3},
      number = {5},
      pages = {102-112},
      doi = {10.11648/j.mcs.20180305.12},
      url = {https://doi.org/10.11648/j.mcs.20180305.12},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.mcs.20180305.12},
      abstract = {In this paper we investigate the invariant and hyperinvariant subspace lattices of some operators. We give a lattice-theoretic description of the lattice of hyperinvariant subspaces of an operator in terms of its lattice of invariant subspaces. We also study the structure of these lattices for operators in certain equivalence classes of some equivalence relations.},
     year = {2018}
    }
    

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Author Information
  • School of Mathematics, College of Biological and Physical Sciences, University of Nairobi, Nairobi, Kenya

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