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Study on dimension and topological spaces in coarse geometry

Research Project

Project/Area Number 19K03467
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 11020:Geometry-related
Research InstitutionEhime University

Principal Investigator

YAMAUCHI Takamitsu  愛媛大学, 理工学研究科(理学系), 教授 (00403444)

Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords粗幾何学 / 次元 / 位相空間 / 同変漸近次元 / 群作用 / 漸近次元 / 粗構造 / 漸近的性質C / 有限分解複雑性
Outline of Research at the Start

粗幾何学(または大尺度幾何学)とは, 遠くで眺めて同じに見える(距離)空間を同じと考える幾何学である. 粗幾何学における中心的な予想が微分トポロジー等に応用をもつ粗Baum-Connes予想であり, 漸近次元や境界と呼ばれる位相空間が, この予想に重要な役割を果たしている. 本研究では, 漸近次元や境界に関する未解決問題に挑戦すると共に, 漸近次元に関連する種々の概念や境界に関する性質の解明を目指す.

Outline of Final Research Achievements

We studied notions related to dimension in coarse geometry and topological spaces which reflect coarse geometric properties of metric spaces. As for dimension, we obtained results on coarse embeddability of hyperspaces consisting of finite subsets into a Hilbert space, and on transfinite asymptotic dimension, which is a transfinite extension of asymptotic dimension. As for topological spaces, we obtained results on coarse compactifications by means of generalized Gromov products, and on connectedness properties of the Higson corona of the half line. We also studied group coarse structures and dimensions defined for group actions.

Academic Significance and Societal Importance of the Research Achievements

有限集合からなる超空間のHilbert空間への粗埋め込み可能性の研究は、Gromov-Hausdroff距離空間の研究へ発展している。超限漸近次元に関する成果によって、Dydakによって導入された漸近的性質Dを超限漸近次元を用いて特徴付けることができた。一般化されたGromov積による粗コンパクト化の成果によって、粗コンパクト化の新たな記述が可能となった。半直線のHigsonコロナの連結性に関する成果によって、Higsonコロナの複雑な位相的性質を顕在化できた。

Report

(6 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (17 results)

All 2024 2023 2022 2021 2020 2019 Other

All Int'l Joint Research (3 results) Journal Article (4 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 4 results) Presentation (10 results) (of which Int'l Joint Research: 2 results,  Invited: 3 results)

  • [Int'l Joint Research] IST Austria(オーストリア)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] University of Udine(イタリア)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] University of Tennessee(米国)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Connectedness properties of the Higson corona of the half line2021

    • Author(s)
      Yamauchi Takamitsu
    • Journal Title

      Topology and its Applications

      Volume: 301 Pages: 107542-107542

    • DOI

      10.1016/j.topol.2020.107542

    • Related Report
      2021 Research-status Report 2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Coarse infinite-dimensionality of hyperspaces of finite subsets2021

    • Author(s)
      Weighill Thomas, Yamauchi Takamitsu, Zava Nicolo
    • Journal Title

      European Journal of Mathematics

      Volume: 8 Issue: 1 Pages: 335-355

    • DOI

      10.1007/s40879-021-00515-3

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Transfinite asymptotic dimension and APD profiles2021

    • Author(s)
      Yamauchi Takamitsu
    • Journal Title

      Topology and its Applications

      Volume: 295 Pages: 107675-107675

    • DOI

      10.1016/j.topol.2021.107675

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Coarse compactifications and controlled products2020

    • Author(s)
      Tomohiro Fukaya, Shin-ichi Oguni, Takamitsu Yamauchi
    • Journal Title

      Journal of Topology and Analysis

      Volume: online Issue: 04 Pages: 1-26

    • DOI

      10.1142/s1793525321500102

    • Related Report
      2022 Research-status Report 2020 Research-status Report
    • Peer Reviewed
  • [Presentation] On a characterization of equivariant asymptotic dimension2024

    • Author(s)
      山内貴光
    • Organizer
      2024 早稲田幾何学的トポロジー研究集会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Group coarse structures on locally compact abelian groups2023

    • Author(s)
      Takamitsu Yamauchi
    • Organizer
      Mini-symposium ``Topology and Applications'' in Mathematics Days in Sofia
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] On dynamic asymptotic dimension of Stone-Cech extensions of proper cocomopact actions2023

    • Author(s)
      山内貴光
    • Organizer
      2023年度ジェネラルトポロジーシンポジウム
    • Related Report
      2023 Annual Research Report
  • [Presentation] 非コンパクト空間上の作用に対する同変漸近次元2023

    • Author(s)
      山内貴光
    • Organizer
      東北大学大学院理学研究科数学専攻 談話会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 有限集合からなる超空間の粗幾何学的無限次元性2022

    • Author(s)
      山内貴光
    • Organizer
      RIMS 共同研究「集合論的および幾何学的トポロジーと関連分野への応用」
    • Related Report
      2022 Research-status Report
  • [Presentation] 局所コンパクトアーベル群の群粗構造2022

    • Author(s)
      山内貴光
    • Organizer
      2022 年度ジェネラルトポロジーシンポジウム
    • Related Report
      2022 Research-status Report
  • [Presentation] 超限漸近次元について2021

    • Author(s)
      山内貴光
    • Organizer
      RIMS共同研究「一般位相幾何学の動向と諸分野との連携」
    • Related Report
      2021 Research-status Report
  • [Presentation] 粗コンパクト化とGromov 積の一般化2019

    • Author(s)
      山内貴光
    • Organizer
      RIMS共同研究 (公開型)「一般位相幾何学の発展と諸分野との連携」
    • Related Report
      2019 Research-status Report
  • [Presentation] Connectedness properties of the Higson corona of the half line2019

    • Author(s)
      Takamitsu Yamauchi
    • Organizer
      The Third Pan-Pacific International Conference on Topology and Applications
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 半直線のHigson coronaの連結性について2019

    • Author(s)
      山内貴光
    • Organizer
      2019年度ジェネラルトポロジーシンポジウム
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2025-01-30  

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