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A new development of the Bratteli-Vershik representations

Research Project

Project/Area Number 20K03643
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 12010:Basic analysis-related
Research InstitutionNagoya Keizai University

Principal Investigator

Shimomura Takashi  名古屋経済大学, 経済学部, 教授 (30440770)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2023: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Keywords零次元系 / Bratteli-Vershik model / AF環 / C*環 / Bratteli diagram / 力学系 / Bratteli-Vershik system / zero-dimensional system / Bratteli-Vershikizable / basic set / Bratteli-Vershik / zero-dimensional systerm / graph covering / subshift / symbolic dynamics
Outline of Research at the Start

力学系のC*接合積は,C*環の重要な事例である.周期点を持たない場合に,研究が進展している.
主要な道具がBratteli-Vershik 表現である.
周期点を持つ零次元系について,Bratteli-Vershik 表現を研究する.
申請者は,あらゆる零次元系に,非自明なBratteli-Vershik表現が存在することを,構成的に証明している.Downarowicz and Karpel 氏達は独立にBratteli-Vershikizability により,非自明なBratteli-Vershik 表現の存在を示した.これらの間の関係,および,これらを用いた零次元系のC*接合積のK群について調べる.

Outline of Final Research Achievements

Putnam, in the context of the Cantor minimal sets, had shown that quasi-sections based Bratteli-Vershik models are possible. In my research, I clearly stated that, in the context of general zero-dimensional systems, all quasi-sections can be bases of the Bratteli-Vershik models. Now some refinements of the quasi-sections are required for the refinements of Bratteli-Vershik models. In this context, the existence of basic sets for general zero-dimensional systems is shown in short manner. With these ways, I could have shown that all zero-dimensional systems have Bratteli-Vershik models such that all minimal sets correspond to the simple Bratteli diagrams.

Academic Significance and Societal Importance of the Research Achievements

量子コンピュータは量子力学に基礎を置くのは言うまでも無いが,C*環はその量子力学の発展や応用を担っている重要な分野である.力学系に関するC*環は,具体的で有意義なものとして早くから研究対象となっている.零次元系のC*環は,それらの中でもAF環との関連で具体的な進捗の著しい分野であると思われる.今回の成果は零次元系全体を包括してAF環と結びつける成果であると考えている.

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (9 results)

All 2022 2021 2020 Other

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (6 results) Remarks (2 results)

  • [Journal Article] Bratteli-Vershik models and graph covering models2020

    • Author(s)
      Takashi Shimomura
    • Journal Title

      Advances in Mathematics

      Volume: 367 Pages: 107127-107127

    • DOI

      10.1016/j.aim.2020.107127

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] Some properties of basic sets2022

    • Author(s)
      下村 尚司
    • Organizer
      2021年度 冬の力学系研究集会
    • Related Report
      2021 Research-status Report
  • [Presentation] Bratteli-Vershik model from basic set2021

    • Author(s)
      下村 尚司
    • Organizer
      2021年度日本数学会年会 2021年4月17日
    • Related Report
      2021 Research-status Report
  • [Presentation] Bratteli-Vershik models for zero-dimensional systems2021

    • Author(s)
      下村 尚司
    • Organizer
      RIMS研究集会「力学系理論の最近の進展とその応用 」 2021年6月24日
    • Related Report
      2021 Research-status Report
  • [Presentation] On a one-to-one correspondence between ordered Bratteli diagrams and basic sets2021

    • Author(s)
      下村 尚司
    • Organizer
      2021年度 エルゴード理論とその周辺 2021年11月18日
    • Related Report
      2021 Research-status Report
  • [Presentation] Bratteli-Vershik models from quasi-sections2021

    • Author(s)
      下村尚司
    • Organizer
      2020年度冬の力学系研究集会
    • Related Report
      2020 Research-status Report
  • [Presentation] Bratteli-Vershik model from basic set2021

    • Author(s)
      下村尚司
    • Organizer
      2021年度日本数学会年会
    • Related Report
      2020 Research-status Report
  • [Remarks] Works

    • URL

      https://sites.google.com/view/takashi-shimomura

    • Related Report
      2022 Research-status Report
  • [Remarks] Works

    • URL

      https://sites.google.com/a/nagoya-ku.ac.jp/takashi-shimomura/

    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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