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Infinite-dimensional Hilbert representations of quivers

Research Project

Project/Area Number 17K18739
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Research Field Analysis, Applied mathematics, and related fields
Research InstitutionKyushu University

Principal Investigator

Watatani Yasuo  九州大学, 数理学研究院, 名誉教授 (00175077)

Project Period (FY) 2017-06-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
Fiscal Year 2019: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywordsquiver / ヒルベルト表現 / 部分空間の配置 / 直既約表現 / 正写像 / 箙 / 作用素 / ヒルベルト空間
Outline of Final Research Achievements

We study infinite-dimensional Hilbert representations of quivers, which associate Hilbert spaces and operators for vertices and arrows of quivers and investigate the construction of indecomposable representations and irreducible maps. We study the relative position of two subspaces in a infinite-dimensional Hilbert space as Hilbert representations of a particular quiver. We reduces it to the classification of operator ranges and construct non-trivial examples. We also study the relative position of three subspaces in a infinite-dimensional Hilbert space and completely characterize the direct sums of double triangle and classical Boolean lattice to publish a paper.

Academic Significance and Societal Importance of the Research Achievements

箙(quiver)の無限次元ヒルベルト表現を考察し, その直既約表現の構成とそれらの間の既約射を研究した。 有限次元の場合の箙の表現はよく知られているが, その無限次元ヒルベルト空間の場合を研究したのは我々の研究が世界で初めてであり意義がある。ビッグデータの位相幾何学的な特徴をとらえるパーシステントホモロジーの研究には有限次元の場合の箙の表現が使われるのでそのこれから先の萌芽的な研究になっている。ヒルベルト空間の2個や3個の部分空間の配置の分類は関数解析での基本的な課題なので, そこに寄与できたことは意味がある。直既約表現の具体的な構成法も提示できたので, これからの発展の糸口にもなった。

Report

(7 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (15 results)

All 2022 2021 2019 2018 2017

All Journal Article (8 results) (of which Peer Reviewed: 8 results) Presentation (7 results) (of which Invited: 3 results)

  • [Journal Article] Non-liner monotone positive maps2022

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

      J. Operator Theory

      Volume: 87 Pages: 203-228

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Non-linear traces on matrix algebra, majorization, unitarily invariant norms and 2-positivity2022

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

      Anal. Math.

      Volume: 48 Pages: 1105-1126

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Dimension groups for self-similar maps and matrix representations of the cores of the associated C*-algebras2021

    • Author(s)
      T. Kajiwara and Y. Watatani
    • Journal Title

      Canad. J. Math.

      Volume: 73 Pages: 1013-1056

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Systems of two subspaces in a Hilbert space2021

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

      Adv. Oper. Theory

      Volume: 6

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Relative position of three subspaces in a Hilbert space2019

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

      Acta Sci. Math. (Szeged)

      Volume: 85 Pages: 519-537

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Unbounded strongly irreducible operators and transitive representations of quivers on infinite-dimensional Hilbert spaces2019

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

      New York J. Math.

      Volume: 25 Pages: 975-1016

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Relative position of three subspaces in a Hilbert space2019

    • Author(s)
      Masatoshi Enomoto and Yasuo Watatani
    • Journal Title

      Acta Sci. Math. (Szeged)

      Volume: 印刷中

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Maximal abelian subalgebras of C*-algebras associated with complex dynamical systems and self-similar maps2017

    • Author(s)
      Tsuyoshi Kajiwara and Yasuo Watatani
    • Journal Title

      J. Math. Anal. Appl.

      Volume: 455 Pages: 1383-1400

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] Non-liner monotone positive maps on C*-algebras2022

    • Author(s)
      Y. Watatani
    • Organizer
      RIMS共同研究「作用素環論の最近の進展」
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Operator theory and non-liner monotone positive maps on C*-algebras2022

    • Author(s)
      綿谷安男
    • Organizer
      作用素論作用素環論研究集会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] C*-環の間の非線型正写像と行列環上の非線型トレースとmajorization理論2022

    • Author(s)
      渚勝, 綿谷安男
    • Organizer
      日本数学会
    • Related Report
      2022 Annual Research Report
  • [Presentation] C*-環の間の非線形正写像2022

    • Author(s)
      渚 勝、 綿谷 安男
    • Organizer
      日本数学会
    • Related Report
      2021 Research-status Report
  • [Presentation] ヒルベルト空間の部分空間の配置と箙のヒルベルト表現2019

    • Author(s)
      綿谷 安男
    • Organizer
      実関数論・関数解析学合同シンポジウム
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] 二つの部分空間の有界同型の不変量2018

    • Author(s)
      榎本雅俊、綿谷安男
    • Organizer
      日本数学会
    • Related Report
      2018 Research-status Report
  • [Presentation] 2つの部分空間の同配置問題2017

    • Author(s)
      榎本雅俊と綿谷安男
    • Organizer
      日本数学会
    • Related Report
      2017 Research-status Report

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Published: 2017-07-21   Modified: 2024-01-30  

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