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2008 Fiscal Year Final Research Report

The structure of invariant subspaces in Hilbert spaces and related topics

Research Project

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Project/Area Number 18540199
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Basic analysis
Research InstitutionShizuoka University (2007-2008)
Tsuruoka National College of Technology (2006)

Principal Investigator

OHWADA Tomoyoshi  Shizuoka University, 教育学部, 准教授 (50321386)

Co-Investigator(Kenkyū-buntansha) SAITO Kichisuke  新潟大学, 自然科学系, 教授 (30018949)
WATATANI Yasuo  九州大学, 数理(科)学研究科(研究院), 教授 (00175077)
Project Period (FY) 2006 – 2008
Keywordsinvariant subspace(不変部分空間) / Hilbert spaces(ヒルベルト空間) / analytic crossed products(解析的接合積)
Research Abstract

本研究の目的は, ヒルベルト空間における不変部分空間の問題に関連して, 自己共役でない作用素環の構造を詳細に調べると共に, それに関する不変部分空間の構造解析を行うものである. 我々は極大性の問題をsemigroupの性質と結び付けて捉え直すことにより, 解析的接合積のdiagonalが因子環であるとき解析的接合積が極大であるための付随するsemigroupが満たすべき条件を明らかにした.
また, 2次元トーラス上のLebesgue空間に関して, 不変部分空間の外枠を捉えることで, その概形をこれまでより詳細に把握することに成功した.

  • Research Products

    (17 results)

All 2008 2007 2006

All Journal Article (10 results) (of which Peer Reviewed: 10 results) Presentation (7 results)

  • [Journal Article] Certain invariant subspace stru cture of L^2(T^2)II2008

    • Author(s)
      Hasegawa, G. Ji, T. Ohwada and K.-S. Saito
    • Journal Title

      Hokkaido Mathemat ical Journal 37

      Pages: 493-505

    • Peer Reviewed
  • [Journal Article] On the calculation of the James constant of Lorenrz sequence spaces2008

    • Author(s)
      K.-I. Mitani, K.-S. Saito and T. Su zuki
    • Journal Title

      Journal of Mathematical Analysis and Applications 343

      Pages: 310-314

    • Peer Reviewed
  • [Journal Article] C^*-algebras associated with Mauldin-Williams graphs2008

    • Author(s)
      M. Ionescu and Y. Watatani
    • Journal Title

      Canadian Mathematical Bulletin 51

      Pages: 545-560

    • Peer Reviewed
  • [Journal Article] The adjoint of Hankel operators associated with analytic crossed products2007

    • Author(s)
      T. Ohwada
    • Journal Title

      Acta Mathematica Hungarica 117

      Pages: 27-34

    • Peer Reviewed
  • [Journal Article] A note on geometrical properties of Banach spaces using $\psi$-direct sums2007

    • Author(s)
      K. Mitani and K-S. Saito
    • Journal Title

      Journal of Mathematical Analysis and Applications 327

      Pages: 898-907

    • Peer Reviewed
  • [Journal Article] Exotic indecomposable systems of four subspace s in a Hilbert space2007

    • Author(s)
      M. Enomoto and Y. Watatani
    • Journal Title

      Integral Equation s and Operator Theory 59

      Pages: 149-164

    • Peer Reviewed
  • [Journal Article] Sarason's interpolation theorem for analytic crossed products2006

    • Author(s)
      T. Ohwada
    • Journal Title

      Functional Analysis and its Applications 40

      Pages: 151-154

    • Peer Reviewed
  • [Journal Article] Commutants of certain analytic operator algebras2006

    • Author(s)
      G. Ji, T. Ohwada and K.-S. Saito
    • Journal Title

      Proceedings of the American Mathematical Society 134

      Pages: 2975-2982

    • Peer Reviewed
  • [Journal Article] A note on maximality of analytic crossed products2006

    • Author(s)
      T. Ohwada, G. Ji, A. Hasegawa and K.-S. Saito
    • Journal Title

      Journal of Mathematical Analysis and Applications 315

      Pages: 216-224

    • Peer Reviewed
  • [Journal Article] Relative position of four subspaces in a Hilbert space2006

    • Author(s)
      M. Enomoto and Y. Watatani
    • Journal Title

      Advances in mathematics 201

      Pages: 263-317

    • Peer Reviewed
  • [Presentation] Refinements of tria ngle inequalities in Banach spaces, International Workshop on Interpol ation Theory2008

    • Author(s)
      K.-S. Saito
    • Organizer
      Function Spaces and Related Topic
    • Place of Presentation
      Toledo Spain
    • Year and Date
      2008-08-08
  • [Presentation] Complex dynamical systems and associated C^*-algebras, Operator Structures and Dynamical Systems2008

    • Author(s)
      Y. Watatani
    • Organizer
      Operator Structures and Dynamical S ystems
    • Place of Presentation
      Lorentz Center, Leiden, Netherlands
    • Year and Date
      2008-07-21
  • [Presentation] 非可換Hardy空間に対するHankel作用素について2007

    • Author(s)
      T. Ohwada
    • Organizer
      バナッハ空間、関数空間及び不等式の研究とその応用
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2007-06-07
  • [Presentation] The geometrical constant and ψ-direct sums of Banach spaces2006

    • Author(s)
      K.-I. Mitani and K.-S. Saito
    • Organizer
      International Symposium on Banach and Function spaces
    • Place of Presentation
      Kyushu Insitutute of Technology
    • Year and Date
      2006-08-16
  • [Presentation] C^*$-algebras associated with complex dynamical systems2006

    • Author(s)
      Y. Watatani
    • Organizer
      Brazilian Operator Algebras Conference
    • Place of Presentation
      Florianopolis, Brazil
    • Year and Date
      2006-07-16
  • [Presentation] Uniform non-〓^n_1-ness of direct sums of Banach spaces2006

    • Author(s)
      M. Kato, K.-S. Saito and T. Tamura
    • Organizer
      バナッハ空間及び関数空間の構造の研究
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2006-06-08
  • [Presentation] On the maximal subalgebras of L∞(G)2006

    • Author(s)
      T. Ohwada
    • Organizer
      バナッハ空間及び関数空間の構造の研究
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2006-06-07

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Published: 2010-06-10   Modified: 2016-04-21  

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