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2009 Fiscal Year Final Research Report

Representations of Terwilliger algebras and their applications

Research Project

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Project/Area Number 18340022
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field General mathematics (including Probability theory/Statistical mathematics)
Research InstitutionKanazawa University

Principal Investigator

ITO Tatsuro  Kanazawa University, 数物科学系, 教授 (90015909)

Co-Investigator(Renkei-kenkyūsha) BANNAI Eiichi  九州大学, 数理学研究院, 名誉教授 (10011652)
MUNEMASA Akihiro  東北大学, 情報科学研究科, 教授 (50219862)
HIRAKI Akira  大阪教育大学, 教育学部, 准教授 (90294181)
SUZUKI Hiroshi  国際基督教大学, 教養学部, 教授 (10135767)
YOSHIARA Satoshi  東京女子大学, 文理学部, 教授 (10230674)
NOMURA Kazumasa  東京医科歯科大学, 教養部, 名誉教授 (40111645)
TANABE Kenichiro  北海道大学, 理学研究院, 准教授 (10334038)
KAWAGOE Kenichi  金沢大学, 数物科学系, 講師 (50293337)
Project Period (FY) 2006 – 2009
Keywordsassociation scheme / P- and Q-polynomial scheme / Terwilliger algebra / TD-pair / Leonard pair / code / design / 極値集合
Research Abstract

離散的空間の研究が近年ますます重要性を増している中で、本研究はその中でも対称性が極めて高くそれ故に応用も広い離散的対称空間について、表現論という代数的手法の基礎理論を構築し、幾何学的側面の研究へその応用の道を開拓した。rank 1の離散的対称空間に附随するTerwilliger algebraのgenricな既約表現を決定したことは特筆すべきbreakthroughである。

  • Research Products

    (30 results)

All 2010 2009 2008 2007 2006

All Journal Article (12 results) (of which Peer Reviewed: 12 results) Presentation (18 results)

  • [Journal Article] The augmented tridiagonal algebra2010

    • Author(s)
      T. Ito, P. Terwilliger
    • Journal Title

      Kyushu J. Math. 64

      Pages: 81-144

    • Peer Reviewed
  • [Journal Article] Tridiagonal pairs of q-Racah type2009

    • Author(s)
      T. Ito, P. Terwilliger
    • Journal Title

      J. Algebra 322no.1

      Pages: 68-93

    • Peer Reviewed
  • [Journal Article] The Drinfel'd polynomial of a tridiagonal pair2009

    • Author(s)
      T. Ito, P. Terwilliger
    • Journal Title

      Information & System Sciences 34no.1-4

      Pages: 255-292

    • Peer Reviewed
  • [Journal Article] Distance regular graphs of $q$-Racah type and the $q$-tetrahedron algebra2009

    • Author(s)
      T. Ito, P. Terwilliger
    • Journal Title

      Michigan Math. Journal 58no.1

      Pages: 241-254

    • Peer Reviewed
  • [Journal Article] Distance regular graphs and the $q$-tetrahedron algebra2009

    • Author(s)
      T. Ito, P. Terwilliger
    • Journal Title

      European J. of Combin. 30no.3

      Pages: 682-697

    • Peer Reviewed
  • [Journal Article] Finite dimensional irreducible modules for the three-point $\mathfrak{sl}_2$ loop algebra2008

    • Author(s)
      T. Ito, P. Terwilliger
    • Journal Title

      Comm. Algebra 36no.12

      Pages: 4557-4598

    • Peer Reviewed
  • [Journal Article] Tridiagonal pairs of Krawtchouk type2007

    • Author(s)
      T. Ito, P. Terwilliger
    • Journal Title

      Linear Algebra Appl. 427no.2-3

      Pages: 218-233

    • Peer Reviewed
  • [Journal Article] $q$-inverting pairs of linear transformations and the $q$-tetrahedron algebra2007

    • Author(s)
      T. Ito, P. Terwilliger
    • Journal Title

      Linear Algebra Appl. 426no.2-3

      Pages: 516-532

    • Peer Reviewed
  • [Journal Article] Two non-nilpotent linear transformations that satisfy the cubic q-Serre relations2007

    • Author(s)
      T. Ito, P. Terwilliger
    • Journal Title

      J. Algebra Appl. 6no.3

      Pages: 477-503

    • Peer Reviewed
  • [Journal Article] The q-tetrahedron algebra and its finite dimensional irreducible modules2007

    • Author(s)
      T. Ito, P. Terwilliger
    • Journal Title

      Comm. Algebra 35no.11

      Pages: 3415-3439

    • Peer Reviewed
  • [Journal Article] Tridiagonal pairs and the quantum affine algebra $U_q({\widehat {sl}}_2)$2007

    • Author(s)
      T. Ito, P. Terwilliger
    • Journal Title

      Ramanujan J. 13no.11

      Pages: 39-62

    • Peer Reviewed
  • [Journal Article] The quantum algebra $U_q(\mathfrak{sl}_2)$ and its equitable presentation2006

    • Author(s)
      Tatsuro Ito, Paul Terwilliger, Chih-wen Weng
    • Journal Title

      J. Algebra 298no.1

      Pages: 284-301

    • Peer Reviewed
  • [Presentation] Association Schemes入門2010

    • Author(s)
      T. Ito
    • Organizer
      織田ゼミ
    • Place of Presentation
      東京大学
    • Year and Date
      20100311-20100313
  • [Presentation] Towards the classification of Pand Q- polynomial association schemes Korea-Japan Workshop on Algebra and Combinatorics2010

    • Author(s)
      T. Ito
    • Organizer
      POSTECH
    • Year and Date
      2010-02-06
  • [Presentation] Towards the classification of Pand Q- polynomial association schemes2009

    • Author(s)
      T. Ito
    • Organizer
      JAIST Workshop on METRIC GRAPH THEORY
    • Place of Presentation
      Kanazawa Culture Hall
    • Year and Date
      2009-11-12
  • [Presentation] TD-pairの分類について2009

    • Author(s)
      T. Ito
    • Organizer
      ミニ集会「代数的組合せ論」
    • Place of Presentation
      九州大学
    • Year and Date
      2009-03-18
  • [Presentation] The q-Onsager algebra2009

    • Author(s)
      T. Ito
    • Organizer
      有限群・頂点作用素代数と組合せ論研究集会
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2009-01-08
  • [Presentation] The q-Onsager algebra2008

    • Author(s)
      T. Ito
    • Organizer
      Geometric and Algebraic Combinatorics 4, Oisterwijk
    • Place of Presentation
      The Netherlands
    • Year and Date
      2008-08-19
  • [Presentation] The q-Onsager algebra2008

    • Author(s)
      T. Ito
    • Organizer
      第20回有限群論草津セミナー
    • Place of Presentation
      草津セミナーハウス
    • Year and Date
      2008-08-01
  • [Presentation] Irreducible representations of Terwilliger algebras for P- and Q-polynomial association schemes2008

    • Author(s)
      T. Ito
    • Organizer
      第25回代数的組合せ論
    • Place of Presentation
      北海道大学学術交流会館
    • Year and Date
      2008-06-23
  • [Presentation] The q-Onsager algebra2008

    • Author(s)
      T. Ito
    • Place of Presentation
      岡山大学談話会
    • Year and Date
      2008-05-08
  • [Presentation] Classification of TD-pairs2008

    • Author(s)
      T. Ito
    • Organizer
      ミニ集会「代数的組合せ論」
    • Place of Presentation
      神戸学院大学ポートアイランドキャンパス
    • Year and Date
      2008-03-22
  • [Presentation] Finite-dimensional irreducible representations of the augmented tridiagonal algebra2008

    • Author(s)
      T. Ito
    • Organizer
      mini-workshop on algebraic combinatorics
    • Place of Presentation
      POSTECH
    • Year and Date
      2008-02-04
  • [Presentation] The augmented tridiagonal algebra2007

    • Author(s)
      T. Ito
    • Organizer
      Algebras, Groups and Geometries in Tambara
    • Place of Presentation
      Tambara International Seminar House
    • Year and Date
      2007-10-17
  • [Presentation] Irreducible representations of the Terwilliger algebra of a P- and Q-polynomial association scheme2007

    • Author(s)
      T. Ito
    • Organizer
      The Com^2MaC Conference on Applications of Group Theory to Combinatorics
    • Place of Presentation
      POSTECH
    • Year and Date
      2007-07-10
  • [Presentation] The q-Onsager algebra and its finite dimensional irreducible representations2007

    • Author(s)
      T. Ito
    • Organizer
      The second Internatinal Congress in Algebra and Combinatorics
    • Place of Presentation
      Beihang University, Beijing, China
    • Year and Date
      2007-07-10
  • [Presentation] The Onsager algebra revisited from a combinatorial viewpoint2007

    • Author(s)
      T. Ito
    • Organizer
      組合せ論ミニ集会
    • Place of Presentation
      九州大学理学部
    • Year and Date
      2007-03-05
  • [Presentation] Irreducible representations of the Terwilliger algebra of a P- and Q-polynomial association scheme III2007

    • Author(s)
      T. Ito
    • Organizer
      Mini-workshop in Algebraic Combinatorics
    • Place of Presentation
      POSTECH
    • Year and Date
      2007-02-12
  • [Presentation] Irreducible representations of the Terwilliger algebra of a P- and Q-polynomial association scheme II2007

    • Author(s)
      T. Ito
    • Organizer
      Korea-Japan Workshop on Algebra and Combinatorics
    • Place of Presentation
      Pusan National University
    • Year and Date
      2007-02-11
  • [Presentation] Irreducible representations of the Terwilliger algebra of a P- and Q-polynomial association scheme2006

    • Author(s)
      T. Ito
    • Organizer
      Japan-Korea Workshop on Algebra and Combinatorics
    • Place of Presentation
      九州大学理学部
    • Year and Date
      2006-10-21

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Published: 2011-06-18   Modified: 2016-04-21  

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