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Structures and Representations of Association Schemes

Research Project

Project/Area Number 17540039
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Algebra
Research InstitutionInternational Christian University

Principal Investigator

SUZUKI Hiroshi  International Christian University, 教養学部, 教授 (10135767)

Co-Investigator(Kenkyū-buntansha) 清水 勇二  国際基督教大学, 教養学部, 教授 (80187468)
山川 あい子  国際基督教大学, 教養学部, 准教授 (80112754)
Co-Investigator(Renkei-kenkyūsha) SHIMIZU Yuji  国際基督教大学, 教養学部, 教授 (80187468)
YAMAKAWA Aiko  国際基督教大学, 教養学部, 准教授 (80112754)
Project Period (FY) 2005 – 2008
Project Status Completed (Fiscal Year 2008)
Budget Amount *help
¥3,820,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2008: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2007: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2006: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2005: ¥1,200,000 (Direct Cost: ¥1,200,000)
Keywords距離正則グラフ / アソシエーション・スキーム / Terwilliger代数 / 完全正則符号 / アソシエーションスキーム / 距離正則クラフ / Tersilliger代数
Research Abstract

組合せ構造の性質を,それに付随する代数的構造によって解き明かすという代数的組合せ論の中心課題を,アソシエーション・スキームの基集合の部分集合が完全正則符号になる条件を,部分集合に関する Terwilliger 代数の加群の性質で表現する手法を中心に解き明かすことに成功した。関連して,強閉な距離正則符号を持つ距離正則グラフの分類を行った。また非原始的Q-多項式型スキームに関する例外型の一つのクラスの非存在を示した。

Report

(5 results)
  • 2008 Annual Research Report   Final Research Report ( PDF )
  • 2007 Annual Research Report
  • 2006 Annual Research Report
  • 2005 Annual Research Report
  • Research Products

    (28 results)

All 2009 2008 2007 2006 2005 Other

All Journal Article (18 results) (of which Peer Reviewed: 10 results) Presentation (10 results)

  • [Journal Article] Non-existence of Imprimitive Q-polynomial Schemes of Exceptional Type with d =42009

    • Author(s)
      D. Cerzo and H. Suzuki
    • Journal Title

      European Journal of Combinatorics 30

      Pages: 674-681

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Non-existence of Imprimitive Q-polynomial Schemesof Exceptional Type with d =42009

    • Author(s)
      D. Cerzo
    • Journal Title

      European Journal of Combinatorics 30

      Pages: 674-681

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Parallelogram-Free Distance-Regular Graphs Having Completely Regular Strongly Regular Subgraphs2009

    • Author(s)
      H. Suzuki
    • Journal Title

      Journal of Algebraic Combinatorics (印刷中)

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Almost 2-Homogeneous Graphs and Completely Regular Quadrangles2008

    • Author(s)
      H, Suzuki
    • Journal Title

      Graphs and Combinatorics 24

      Pages: 571-585

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Almost 2-Homogeneous Graphs and Completely Regular Quadrangles2008

    • Author(s)
      H. Suzuki
    • Journal Title

      Graphs and Combinatorics 24

      Pages: 571-585

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] On Strongly Closed Subgraphs with Diameter Two and the Q-Polynomial Property2007

    • Author(s)
      H. Suzuki
    • Journal Title

      European Journal of Combinatorics 28

      Pages: 167-185

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Tight Distance-Regular Graphs with Respect to Subsets2007

    • Author(s)
      R. Hosoya and H. Suzuki
    • Journal Title

      European Journal of Combinatorics 28

      Pages: 61-74

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] On Strongly Closed Subgraphs with Diameter Two and the Q-Polynomial Property2007

    • Author(s)
      Suzuki, H.
    • Journal Title

      European Journal of Combinatorics 28

      Pages: 167-185

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Tight Distance-Regular Graphs with Respect to Subsets2007

    • Author(s)
      Horoya, R.
    • Journal Title

      European Journal of Combinatorics 28

      Pages: 61-74

    • Related Report
      2006 Annual Research Report
  • [Journal Article] The Geometric Girth of a Distance-Regular Graph Having Certain Thin Irreducible Modules for the Terwilliger Algebra2006

    • Author(s)
      H. Suzuki
    • Journal Title

      European Journal of Combinatorics 27

      Pages: 235-254

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Selberg-Witten Integrable Systems and Periods of Rational Elliptic Surfaces2006

    • Author(s)
      Y. Shimizu
    • Journal Title

      Contemporary Mathematics 416

      Pages: 237-247

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Selberg-Witten Integrable Systems and Periods of Rational Elliptic Surfaces2006

    • Author(s)
      Shimizu, Y.
    • Journal Title

      Contemporary Mathematics 416

      Pages: 237-247

    • Related Report
      2006 Annual Research Report
  • [Journal Article] The Geometric Girth of a Distance-Regular Graph Having Certain Thin Irreducible Modules for the Terwilliger Algebra2006

    • Author(s)
      Suzuki, H.
    • Journal Title

      European Journal of Combinatorics 27

      Pages: 235-254

    • Related Report
      2005 Annual Research Report
  • [Journal Article] The Terwilliger Algebra Associated with a Set of Vertices in a Distance-Regular Graph2005

    • Author(s)
      H. Suzuki
    • Journal Title

      Journal of Algebraic Combinatorics 22

      Pages: 5-38

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] The Terwilliger Algebra Associated with a Set of Vertices in a Distance-Regular Graph2005

    • Author(s)
      Suzuki, H.
    • Journal Title

      Journal of Algebraic Combinatorics 22

      Pages: 5-38

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Parallelogram-Free Distance-Regular Graphs Having Completely Regular Strongly Regular Subgraphs

    • Author(s)
      H. Suzuki
    • Journal Title

      Journal of Algebraic Combinatorics (印刷中)

    • Related Report
      2008 Final Research Report
  • [Journal Article] On Strongly Closed Subgraphs with Diameter Two and the Q-Polynomial Property

    • Author(s)
      Suzuki, H.
    • Journal Title

      European Journal of Combinatorics (印刷中)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Tight Distance-Regular Graphs with Respect to Subsets

    • Author(s)
      Horoya, R.
    • Journal Title

      European Journal of Combinatorics (印刷中)

    • Related Report
      2005 Annual Research Report
  • [Presentation] Extra-special groups, group schemes and balanced sets2009

    • Author(s)
      H. Suzuki
    • Organizer
      Mini Conference on Group Theory
    • Place of Presentation
      Cheng Kung Univ, Taiwan
    • Year and Date
      2009-03-18
    • Related Report
      2008 Annual Research Report
  • [Presentation] Extra-Spceial Groups, Group Schemes and Balanced Set, Mini-Workshop on Finite Groups2009

    • Author(s)
      H. Suzuki
    • Organizer
      National Center for theoretical Sciences
    • Place of Presentation
      National Cheng Kung University, Tainan
    • Year and Date
      2009-03-13
    • Related Report
      2008 Final Research Report
  • [Presentation] D-branes and Lowen's derived deformation2008

    • Author(s)
      清水勇二
    • Organizer
      第3回代数・解析・幾何学セミナー
    • Place of Presentation
      鹿児島大学
    • Year and Date
      2008-02-20
    • Related Report
      2008 Final Research Report
  • [Presentation] D-branes Lowen's deformation2008

    • Author(s)
      清水 勇二
    • Organizer
      第3回代数・解析・幾何学セミナー
    • Place of Presentation
      鹿児島大学
    • Year and Date
      2008-02-20
    • Related Report
      2007 Annual Research Report
  • [Presentation] Parallelogram-Free Distance-Regular Graphs Having Completely Regular Strongly Regular Subgraphs2007

    • Author(s)
      H. Suzuki
    • Organizer
      The 22nd Algebraic Combinatorics Seminar at Pusan National University
    • Year and Date
      2007-12-24
    • Related Report
      2008 Final Research Report
  • [Presentation] 2-Homogeneity and Completely Regular Strongly Regular Subgraphs2007

    • Author(s)
      H. Suzuki
    • Organizer
      「有限群論と代数的組合せ論」研究集会
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2007-12-18
    • Related Report
      2008 Final Research Report
  • [Presentation] 2-homogeneity and completely regular strongly regular subgraphs2007

    • Author(s)
      鈴木 寛
    • Organizer
      「有限群論と代数的組合せ論」研究集会
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2007-12-18
    • Related Report
      2007 Annual Research Report
  • [Presentation] Parallelogram-free distance-regular graphs having completely regular strongly regular subgraphs2007

    • Author(s)
      鈴木 寛
    • Organizer
      The 22nd Algebraic Combinatorics Seminar
    • Place of Presentation
      韓国釜山大学
    • Year and Date
      2007-11-24
    • Related Report
      2007 Annual Research Report
  • [Presentation] 2次元複素射影空間の非可換変形2007

    • Author(s)
      清水勇二
    • Organizer
      数学談話会
    • Place of Presentation
      九州大学
    • Year and Date
      2007-07-04
    • Related Report
      2008 Final Research Report
  • [Presentation] 2次元複射影空間の非可換変形2007

    • Author(s)
      清水 勇二
    • Organizer
      談話会
    • Place of Presentation
      九州大学
    • Year and Date
      2007-07-04
    • Related Report
      2007 Annual Research Report

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Published: 2005-04-01   Modified: 2016-04-21  

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