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Transversal Study of Quandles, Symmetric Spaces, and Combinatorics

Research Project

Project/Area Number 19K21831
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 11:Algebra, geometry, and related fields
Research InstitutionOsaka Metropolitan University (2022-2023)
Osaka City University (2019-2021)

Principal Investigator

Tamaru Hiroshi  大阪公立大学, 大学院理学研究科, 教授 (50306982)

Project Period (FY) 2019-06-28 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2019: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywordsカンドル / 対称空間 / グラフ / 組み合わせ論
Outline of Research at the Start

本研究では,「カンドル」と「対称空間」と「組合せ論」を結びつけた横断的な研究を行う。研究計画としては,既に開始されている共同研究を含めて,関連する研究協力者と打ち合わせを行いながら協力して進める。また,昨年11月にはカンドルと対称空間と組み合わせ論の研究者を集めた研究集会を開催したが,本研究を遂行する際にも,同様の研究集会あるいはセミナーを開催する予定である。

Outline of Final Research Achievements

We have made progress in the transversal study of quandles, symmetric spaces, and combinatorics. We published a paper that newly formulates the concept of s-commutative subsets for quandles. This concept is closely related to combinatorics and coding theory, and is also an extension of antipodal sets studied in the theory of symmetric spaces. Additionally, the new method of constructing quandles obtained by observing symmetric spaces utilizes graphs, which is another outcome of our transversal research. Furthermore, we oeganized an annual conference titled "Quandles and Symmetric Spaces" every year, and an overview paper is scheduled to be published in the journal "Sugaku" issued by the Mathematical Society of Japan. We believe this contributes to the advancement of new research and the fostering of future researchers.

Academic Significance and Societal Importance of the Research Achievements

我々の研究成果は,カンドルの研究を中心として,対称空間論および組み合わせ論などの様々な分野と関係する新たな研究領域を開拓するものと自負している。これにより,カンドルの研究に新しい道具や概念を持ち込み,さらに対称空間論などの既存の研究分野にも新しい問題意識を持ち込んでおり,その学術的意義は大きいと考える。また,研究代表者と大学院生等の若手研究者の共同研究も多く,さらに我々の研究成果に触発されて他大学の大学院生が新たな研究成果を得るなどの成果もある。このように我々の研究成果は,多くの教育的効果を上げており,若手研究者育成にも寄与していると考える。

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

    (56 results)

All 2024 2023 2022 2021 2020 2019 Other

All Int'l Joint Research (2 results) Journal Article (17 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 8 results,  Open Access: 4 results) Presentation (28 results) (of which Int'l Joint Research: 13 results,  Invited: 28 results) Remarks (2 results) Funded Workshop (7 results)

  • [Int'l Joint Research] Universidade de Santiago de Compostela(スペイン)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Katholieke Universiteit te Leuven(ベルギー)

    • Related Report
      2020 Research-status Report
  • [Journal Article] A classification of left-invariant Lorentzian metrics on some nilpotent Lie groups2023

    • Author(s)
      Yuji Kondo, Hiroshi Tamaru
    • Journal Title

      Tohoku Mathematical Journal

      Volume: 75 Issue: 1 Pages: 89-117

    • DOI

      10.2748/tmj.20211122

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] A CLASSIFICATION OF LEFT-INVARIANT SYMPLECTIC STRUCTURES ON SOME LIE GROUPS2023

    • Author(s)
      Luis Pedro Castellanos Moscoso, Hiroshi Tamaru
    • Journal Title

      Beitrage zur Algebra und Geometrie / Contributions to Algebra and Geometry

      Volume: 20 Issue: 19 Pages: 1-16

    • DOI

      10.1007/s13366-022-00643-1

    • URL

      https://ocu-omu.repo.nii.ac.jp/records/2016907

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] 左不変リーマン計量のモジュライ空間が1 次元となるLie 群について2023

    • Author(s)
      Hiroshi Tamaru
    • Journal Title

      部分多様体幾何とリー群作用 2022 記録集

      Volume: -

    • Related Report
      2023 Annual Research Report
  • [Journal Article] On the moduli spaces of left-invariant Riemannian metrics on Lie groups --- a report on the one-dimensional case2023

    • Author(s)
      Hiroshi Tamaru
    • Journal Title

      Proceedings of The 24th International Workshop on Differential Geometry & Related Fields

      Volume: -

    • Related Report
      2023 Annual Research Report
  • [Journal Article] A commutativity condition for subsets in quandles --- a generalization of antipodal subsets2022

    • Author(s)
      Akira Kubo, Mika Nagashiki, Takayuki Okuda, Hiroshi Tamaru
    • Journal Title

      Contemporary Mathematics

      Volume: 777 Pages: 103-125

    • DOI

      10.1090/conm/777/15631

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] A Lie theoretic interpretation of realizations of some contact metric manifolds2022

    • Author(s)
      Takahiro Hashinaga, Akira Kubo, Yuichiro Taketomi, Hiroshi Tamaru
    • Journal Title

      New Horizons in Differential Geometry and Its Related Fields

      Volume: - Pages: 71-90

    • DOI

      10.1142/9789811248108_0005

    • ISBN
      9789811248092, 9789811248108
    • Related Report
      2022 Research-status Report 2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Quandles and Symmetric Spaces 20212022

    • Author(s)
      Hiroshi Tamaru
    • Journal Title

      OCAMI Reports

      Volume: 9 Pages: ii-113

    • URL

      https://ocu-omu.repo.nii.ac.jp/records/2020728

    • Related Report
      2021 Research-status Report
    • Open Access
  • [Journal Article] 対称空間論の離散化とカンドル代数, Part V2022

    • Author(s)
      Hiroshi Tamaru
    • Journal Title

      RIMS Kokyuroku

      Volume: 2210

    • Related Report
      2021 Research-status Report
    • Open Access
  • [Journal Article] A classification of left-invariant symplectic structures on some Lie groups2022

    • Author(s)
      Luis Pedro Castellanos Moscoso, Hiroshi Tamaru
    • Journal Title

      Beitrage Algebra Geom.

      Volume: -

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] A classification of left-invariant Lorentzian metrics on some nilpotent Lie groups2022

    • Author(s)
      Yuji Kondo, Hiroshi Tamaru
    • Journal Title

      Tohoku Math. J.

      Volume: -

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] A commutativity condition for subsets in quandles --- a generalization of antipodal subsets2022

    • Author(s)
      Akira Kubo, Mika Nagashiki, Takayuki Okuda, Hiroshi Tamaru
    • Journal Title

      Differential Geometry and Global Analysis, in Honor of Tadashi Nagano. Contemp. Math.

      Volume: 777

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] 可解岩澤群内の余次元 1 リッチソリトン部分群2021

    • Author(s)
      Hiroshi Tamaru
    • Journal Title

      研究集会「部分多様体幾何とリー群作用 2020」記録集

      Volume: -

    • Related Report
      2021 Research-status Report
  • [Journal Article] CODIMENSION ONE RICCI SOLITON SUBGROUPS OF SOLVABLE IWASAWA GROUPS2021

    • Author(s)
      Miguel Dominguez-Vazquez Miguel, Victor Sanmartin-Lopez, Hiroshi Tamaru
    • Journal Title

      Journal de Mathematiques Pures et Appliquees

      Volume: 20 Issue: 22 Pages: 1-28

    • DOI

      10.1016/j.matpur.2021.05.008

    • URL

      https://ocu-omu.repo.nii.ac.jp/records/2016910

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Remarks on totally geodesic complex curves in Hermitian symmetric spaces2021

    • Author(s)
      Akira Kubo, Takayuki Okuda, Hiroshi Tamaru
    • Journal Title

      Proceedings of The 23rd International Differential Geometry Workshop on Submanifolds in Homogeneous Spaces & Related Topics

      Volume: 23

    • Related Report
      2021 Research-status Report
  • [Journal Article] 対称空間論の離散化とカンドル代数, Part IV.2019

    • Author(s)
      田丸博士
    • Journal Title

      研究集会「部分多様体論・湯沢 2018」記録集

      Volume: -

    • Related Report
      2019 Research-status Report
    • Open Access
  • [Journal Article] Moment maps and isoparametric hypersurfaces in spheres --- some recent results2019

    • Author(s)
      Shinobu Fujii, Hiroshi Tamaru
    • Journal Title

      Proceedings of the 22nd International Workshop on Differental Geometry of Submanifolds in Symmetric Spaces and Related Problems

      Volume: -

    • Related Report
      2019 Research-status Report
  • [Journal Article] Dynkin indices for totally geodesic submanifolds in compact symmetric spaces2019

    • Author(s)
      Takayuki Okuda, Akira Kubo, Hiroshi Tamaru
    • Journal Title

      Proceedings of the 22nd International Workshop on Differental Geometry of Submanifolds in Symmetric Spaces and Related Problems

      Volume: -

    • Related Report
      2019 Research-status Report
  • [Presentation] リー群上の左不変な幾何構造について:モジュライ空間と特別な構造の存在・非存在問題2024

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      立命館大学幾何学セミナー
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Left-invariant geometric structures on Lie groups and their moduli spaces2024

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      The 4th International Conference on Geometry, Analysis, and Numerics in Differential Geometry
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] リー群上の左不変な幾何構造について:モジュライ空間と特別な構造の存在・非存在問題2024

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      名工大幾何学講演会 2024
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] On the moduli spaces of left-invariant Riemannian metrics on Lie groups2023

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      The 21st OCAMI-RIRCM Joint Differential Geometry Workshop
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] On the moduli spaces of left-invariant Riemannian metrics on Lie groups2023

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      Representation Theory and Differential Geometry on homogeneous spaces
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Quandles from the viewpoint of symmetric spaces2023

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      7th Tunisian-Japanese Conference: Geometric and Harmonic Analysis on Homogeneous Spaces and Applications
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Quandles from the viewpoint of symmetric spaces2023

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      部分多様体幾何とリー群作用 2023
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Lie groups whose moduli spaces of left-invariant Riemannian metrics are one-dimensional2023

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      部分多様体幾何とリー群作用 2022
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] On the moduli spaces of left-invariant Riemannian metrics on Lie groups2023

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      Mini-Workshop: Global Analysis and Geometry
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Geometry of some nilpotent Lie groups with left-invariant metrics2022

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      東京理科大学理工学部数学科談話会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Introduction to quandles and discrete symmetric spaces2022

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      Geometry of Symmetric Spaces and Group Actions
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] A commutativity condition for subsets in symmetric spaces and quandles2021

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      部分多様体論と関連する幾何構造研究の深化と融合
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Totally geodesic surfaces in symmetric spaces and applications2021

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      The 23rd International Differential Geometry Workshop on Submanifolds in Homogeneous Spaces and Related Topics - The 19th RIRCM-OCAMI Joint Differential Geometry Workshop
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Codimension one Ricci soliton subgroups of solvable Iwasawa groups2021

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      対称空間と群作用の幾何学
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Introduction to quandles from the viewpoint of symmetric spaces2021

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      北海道大学幾何学コロキウム
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Quandles from the viewpoint of symmetric spaces - a survey2021

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      カンドルと対称空間
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Milnor-type theorems for left-invariant pseudo-Riemannian metrics2021

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      Workshop: 擬リーマン多様体の幾何の諸相
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Codimension one Ricci soliton subgroups of solvable Iwasawa groups2021

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      The 6th China-Japan Geometry Conference
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] A commutativity condition for subsets in quandles --- a generalization of antipodal subsets2021

    • Author(s)
      田丸博士
    • Organizer
      筑波大学微分幾何学セミナー (online)
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] 可解岩澤群内の余次元 1 リッチソリトン部分群2021

    • Author(s)
      田丸博士
    • Organizer
      部分多様体幾何とリー群作用2020 (online)
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] Left-invariant metrics and submanifold geometry of noncompact symmetric spaces2020

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      AMS Special Session on Differential Geometry and Global Analysis, Honoring the Memory of Tadashi Nagano (1930-2017)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Quandles and discrete symmetric spaces2020

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      淡路島幾何学研究集会 2020
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Quandles and discrete symmetric spaces2020

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      第15回代数・解析・幾何学セミナー (鹿児島大学)
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Moment maps and isoparametric hypersurfaces in spheres2019

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      Workshop on the Isoparametric Theory (Beijing Normal University)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Geometry of homogeneous hypersurfaces in noncompact symmetric spaces2019

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      第2回水戸幾何小研究集会 (茨城大学)
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] On the moduli spaces of left-invariant geometric structures2019

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      Workshop on geometric analysis and homogeneous geometry (The University of Queensland)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Moment maps and isoparametric hypersurfaces in spheres --- some recent results2019

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      The 22nd International Workshop on Differential Geometry of Submanifolds in Symmetric Spaces and Related Problems (Kyungpook National University)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Geometry of homogeneous hypersurfaces in noncompact symmetric spaces2019

    • Author(s)
      Hiroshi Tamaru
    • Organizer
      Symmetry and shape - Celebrating the 60th birthday of Prof. J. Berndt (Universidade de Santiago de Compostela, Spain)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Remarks] Tamaru's WebPage

    • URL

      https://www.omu.ac.jp/sci/tamaru/

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
  • [Remarks]

    • URL

      http://www.sci.osaka-cu.ac.jp/~tamaru/

    • Related Report
      2020 Research-status Report
  • [Funded Workshop] The 21st OCAMI-RIRCM Joint Differential Geometry Workshop2023

    • Related Report
      2023 Annual Research Report
  • [Funded Workshop] The 8th China-Japan Geometry Conference2023

    • Related Report
      2023 Annual Research Report
  • [Funded Workshop] Workshop: Global Analysis and Geometry 2023 at Osaka2023

    • Related Report
      2023 Annual Research Report
  • [Funded Workshop] 2023 OCAMI-RIRCM International Workshop on Geometry and Symmetric Spaces2023

    • Related Report
      2022 Research-status Report
  • [Funded Workshop] The 7th Japan-China Geometry Conference2022

    • Related Report
      2022 Research-status Report
  • [Funded Workshop] Geometry of Symmetric Spaces and Group Actions2022

    • Related Report
      2021 Research-status Report
  • [Funded Workshop] The 23rd International Differential Geometry Workshop on Submanifolds in Homogeneous Spaces and Related Topics (The 19th RIRCM-OCAMI Joint Differential Geometry Workshop)2021

    • Related Report
      2021 Research-status Report

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Published: 2019-07-04   Modified: 2025-01-30  

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