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2008 Fiscal Year Self-evaluation 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)

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

本研究は、Bose-Mesner algebraの表現の上に構築されていた従来の代数的組合せ論を、それを含みかつそれよりはるかに大きなalgebraであるところのT-algの表現の上に再構築することをめざしている。表現論はもちろん格段に難しくなるが、組合せ構造のはるかに精密な解析が可能になる。本研究の第一の目的は、P- and Q-poly schemeに付随するT-algの既約表現を決定することである。まず代数のレベルで既約表現を決定し、次に組合せ論のレベルで既約表現を決定する、すなわち標準加群の既約成分への分解を決定する。第二の目的は、関連する組合せ構造の研究をT-algの表現を通して行うことである。関連する組合せ構造としては、まずP- and Q-poly schemeそのもの(の分類)を研究対象とし、つぎにP- and Q-poly scheme(あるいはそれに近い構造を持つ基礎空間)におけるcodeとdesignおよび極値集合を研究対象としている。これらの研究対象は、古典的なcodeとdesignおよび極値集合を特別な場合として含む。また理論的枠組みとしては、本研究は、従来のDelsarte理論を特別な場合として含む。

  • Research Products

    (10 results)

All 2009 2008 2007 2006 Other

All Journal Article (5 results) (of which Peer Reviewed: 5 results) Presentation (5 results)

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

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

      Europ.J. of Combinatorics 30

      Pages: 682-697

    • Peer Reviewed
  • [Journal Article] Finite dimensional irreducible modules for the three-point $\mathfrak{s1}_2$ loop algebra2008

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

      Comm. Algebra 36,no.12

      Pages: 4557-4598

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

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

      J.Algebra Appl 6,no.3

      Pages: 477-503

    • Peer Reviewed
  • [Journal Article] Tridiagonal pairs and the quantum affine algebra $U_q({\widehat {s1}}_2)$2007

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

      Ramanujan J. 13,no.1-3

      Pages: 39-62

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

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

      accepted for publication in J.Algebra (掲載確定)

    • Peer Reviewed
  • [Presentation] The q-Onsager algebra2008

    • Author(s)
      T.Ito
    • Organizer
      Geometric and Algebraic Combinatorics4
    • Place of Presentation
      Oisterwijk, The Netherlands
    • Year and Date
      2008-08-19
  • [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] Irreducible representations of the Terwilliger algebraof 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: 2010-06-11   Modified: 2016-04-21  

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