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2007 Fiscal Year Annual Research Report

代数的組合せ論の総合的研究

Research Project

Project/Area Number 16340010
Research InstitutionKyushu University

Principal Investigator

坂内 英一  Kyushu University, 大学院・数理学研究院, 教授 (10011652)

Co-Investigator(Kenkyū-buntansha) 坂内 悦子  九州大学, 大学院・数理学研究院, 准教授 (00253394)
小池 正夫  九州大学, 大学院・数理学研究院, 教授 (20022733)
宗政 昭弘  東北大学, 大学院・情報科学研究科, 教授 (50219862)
伊藤 達郎  金沢大, 大学院・自然科学研究科, 教授 (90015909)
鈴木 寛  国際基督教大学, 教養学部, 教授 (10135767)
Keywords代数的組合せ論 / アソシエーションスキー / デザイン / コード / モジュラー形式 / 球面上のデザイン / 格子 / Moonshine
Research Abstract

この科研費のひとつの目的は研究集会の講演者旅費の援助などを通じて、日本の代数的組合せ論全体の発展に広く寄与することであった。本年度は6月の第24回代数的組合せ論シンポジウム(近畿大学),12月の京大数理研研究集会有限群論と代数的組合せ論(責任者:原田昌晃)などを主に支援した.また代表者,分担者の海外でのいくつかの研究発表の旅費にも用いた.
日本の代数的組合せ論は順調な進展を持続している.アソシエーションスキーム,距離正則グラフ,コード,デザイン,格子,モジュラー形式,Sphere Packingsなどに関しての先進的な研究が進展中である.研究代表者個人の研究の今年度の主体は,
(i)ユークリッド空間上のデザインの研究(坂内悦子との共同研究)を推進し,tightデザインの分類問題において新しい進展を見た,特に2つの球面上のtight Euclidean 7-designの分類を完成させた.また,球面上のantipodalなt〓2s-3である有限集合はQ-多項式アソシエーションスキームの構造を持つことの証明も完成させ,t=5,s=4の新しい例がmaximal real MUBから得られることも示した.現在,Tight Euclideanデザインにどのようにcoherent configurationが付随するかの研究も開始したところである.
(ii)H.Cohnのuniversal optimalな球面上のコードに関連する2つのアソシエーションスキームの一意性に関する研究を更に進めて,Abdukhalikov,須田庄と共同でその一つの場合の高次元の類似がmaximal real MUBから得られることの証明にも成功した.
(iii)ユークリッド格子特にextremal latticesに付随する球面デザインがどのtに対してt-デザインになるか,また
(iv)Conway-NortonのMonstrous Moonshineに関してのMcKay-Thompson seriesから出来るHecke型Faber多項式の零点の研究も継続している.

  • Research Products

    (71 results)

All 2008 2007

All Journal Article (27 results) (of which Peer Reviewed: 26 results) Presentation (44 results)

  • [Journal Article] On the zeros of Hecke type Faber polynomials2008

    • Author(s)
      Eiichi Bannai, K.Kojima and T.Miezaki
    • Journal Title

      Kyushu J.Math. (掲載決定)

  • [Journal Article] Uniqueness of certain association schemes2008

    • Author(s)
      坂内 英一・坂内 悦子・坂内 英夫
    • Journal Title

      Europ.J.Combintorics(special issue in honor of 80th birthday of Professor ZheXian Wan) (掲載決定)

    • Peer Reviewed
  • [Journal Article] Character tables of the association schemes coming from the action of $G_2(q)$ on hyperplanes of type $O_6^{\epsilon}(q)$2008

    • Author(s)
      Eiichi Bannai・Sung Yell Song・Hiromichi Yamada
    • Journal Title

      J.of Applied Math.and Computing (掲載決定)

    • Peer Reviewed
  • [Journal Article] Distanceregular graphs and the $q$-tetrahedron algebra2008

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

      Europ.J.of Combinatorics (掲載決定)

    • Peer Reviewed
  • [Journal Article] Finite-dimensional irreducible modules for the three-point $\mathfrak{s1}_2$ loop algebra,2008

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

      Comm.Algebra (掲載決定)

    • Peer Reviewed
  • [Journal Article] Distance-regular graphs of $q$-Racah type and the $9$-tetrahedron algebra2008

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

      Michigan Mathematical Journal (掲載決定)

    • Peer Reviewed
  • [Journal Article] A characterization of the Hamming graph by strongly closed subgraphs2008

    • Author(s)
      A.Hiraki
    • Journal Title

      European Journal of Combinatorics (掲載決定)(印刷中)

    • Peer Reviewed
  • [Journal Article] Nilpotent schemes and group-like schemes2008

    • Author(s)
      花木 章秀
    • Journal Title

      J.Combin.Theory Ser.A 115

      Pages: 226-236

    • Peer Reviewed
  • [Journal Article] Clifford theory for commutative association schemes2008

    • Author(s)
      花木 章秀
    • Journal Title

      Discrete.Math. (掲載決定)

    • Peer Reviewed
  • [Journal Article] Commutativity of association schemes of prime square order having non-trivial thin closed subsets2008

    • Author(s)
      花木 章秀
    • Journal Title

      J.Algebraic Combin (掲載決定)

    • Peer Reviewed
  • [Journal Article] New nonbinary self-dual codes2008

    • Author(s)
      A.Gulliver and M.Harada
    • Journal Title

      IEEE Trans.Inform.Theory 54

      Pages: 415-417

    • Peer Reviewed
  • [Journal Article] On double circulant doubly even self-dual [72,36,12]codes and their neighbors2008

    • Author(s)
      A.Gulliver and M.Harada
    • Journal Title

      Australasian J.Combin. 40

      Pages: 137-144

    • Peer Reviewed
  • [Journal Article] Determination of weight enumerators of binary extremal self-dual [42,21,8]codes2008

    • Author(s)
      S.Bouyuklieva, M.Harada and A.Munemasa
    • Journal Title

      Finite Fields and Their Applications 14

      Pages: 177-187

    • Peer Reviewed
  • [Journal Article] Simple abelian quadruple systems2007

    • Author(s)
      Akihiro Munemasa and Masanori Sawa
    • Journal Title

      J.Combin.Theory, Ser.〜A 114

      Pages: 1160-1164

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Some self-dual codes invariant under the Hall-Janko group2007

    • Author(s)
      N.Chigira, M.Harada and M.Kitazume
    • Journal Title

      J.Algebra 316

      Pages: 578-590

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] On the strong non-rigidity of certain tight Euclidean designs2007

    • Author(s)
      坂内 英一・坂内 悦子・D.Suprijanto
    • Journal Title

      Europ.J.Combinatorics 28

      Pages: 1662-1680

    • Peer Reviewed
  • [Journal Article] On the covering radii of extremal doubly even self-dual codes2007

    • Author(s)
      Masaaki Harada and Akihiro Munemasa
    • Journal Title

      Adv.Math.Commun. 1

      Pages: 251-256

    • 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] The q-trahedron algebra and its finite dimensional irreducible modules2007

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

      Comm.Algebra 35,no.11

      Pages: 3415-3439

    • Peer Reviewed
  • [Journal Article] Two non-nilpotent linear transformations that satisfy the cubic q-Serre relations,2007

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

      J.Algebra Appl. 6,no.3

      Pages: 477-503

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

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

      Linear Algebra Appl. 426,no.2-3

      Pages: 516-532

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

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

      Linear Algebra Appl.427(2007), no.2-3, 218-233 427,no.2-3

      Pages: 218-23

    • 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

    • Peer Reviewed
  • [Journal Article] On Strongly Closed Subgraphs with Diameter Two and the Q-Polynomi al Property2007

    • Author(s)
      H.Suzuki
    • Journal Title

      European Journal of Combinatorics 28

      Pages: 167-185

    • Peer Reviewed
  • [Journal Article] Characters of association schemes containing a strongly normal closed subset of prime index2007

    • Author(s)
      花木 章秀
    • Journal Title

      Proc.Amer.Math.Soc. 135,no.9

      Pages: 2683-2687

    • Peer Reviewed
  • [Journal Article] Extremal ternary self-dual codes constructed from neggacirculant matrices2007

    • Author(s)
      M.Harada, W.Holzmann, H.Kharaghani, M.Khorvash
    • Journal Title

      Graphs Combin. 23

      Pages: 401-417

    • Peer Reviewed
  • [Journal Article] Optimal double circulant self-dual codes over F4 II2007

    • Author(s)
      T.A.Gulliver, M.Harada and H.Miyabayashi
    • Journal Title

      Australasian J.Combin. 39

      Pages: 163-174

    • Peer Reviewed
  • [Presentation] Classification of TD-pairs2008

    • Author(s)
      Tatsuro 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
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] ユークリッド空間のデザインその後2008

    • Author(s)
      坂内 悦子
    • 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
      2008-03-21
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Finite-dimensional irreducible representations of the augmented tridiagonal algebra2008

    • Author(s)
      伊藤 達郎
    • Organizer
      mini-workshop on algebraic combinatorics
    • Place of Presentation
      POSTECH, 韓国
    • Year and Date
      2008-03-04
  • [Presentation]2008

    • Author(s)
      坂内 英一
    • Organizer
      Workshop on Linear and Semidefinite Programming bounds
    • Place of Presentation
      Univ.of Bonn, ドイツ
    • Year and Date
      2008-02-29
  • [Presentation] Assmus-Mattson型の定理について2008

    • Author(s)
      坂内 英一
    • Organizer
      博多数論小研究集会
    • Place of Presentation
      九州大学,福岡
    • Year and Date
      2008-02-23
  • [Presentation] Distance-regular graph with $c_{2}>1$ and $a_{1}=0<a_{2}$2008

    • Author(s)
      平木 彰
    • Organizer
      Fourth Korea-Japan Workshop on Algebra and Combinatorics
    • Place of Presentation
      POSTHCH, 韓国
    • Year and Date
      2008-02-02
  • [Presentation] Tow recent results in extremal self-dual codes、2008年2月1日2008

    • Author(s)
      原田 昌晃
    • Organizer
      The 4^<th> Korea-Japan Workshop on Algebra and Combinatorics
    • Place of Presentation
      浦項工科大、韓国
    • Year and Date
      2008-02-01
  • [Presentation] Clifford theory for association schemes2008

    • Author(s)
      Akihide Hanaki
    • Organizer
      お茶の水大表現論セミナー
    • Place of Presentation
      信州大学
    • Year and Date
      2008-01-26
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Congruences between extremal modular forms and theta series of special types modulo powers of 2 and 32008

    • Author(s)
      小池 正夫
    • Organizer
      East Asia Number Theory Conference
    • Place of Presentation
      KAIST, Daejeon Korea
    • Year and Date
      2008-01-22
  • [Presentation] ユークリッド空間のデザインについて2008

    • Author(s)
      坂内 悦子
    • Organizer
      代数学セミナー
    • Place of Presentation
      九州大学
    • Year and Date
      2008-01-18
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] 球面上の良い有限点集合2008

    • Author(s)
      坂内 英一
    • Organizer
      北海道大学数学教室談話会
    • Place of Presentation
      北海道大学,札幌
    • Year and Date
      2008-01-11
  • [Presentation] 2-homogeneity and completely regular strongly regular subgraphs2007

    • Author(s)
      鈴木 寛
    • Organizer
      Two Lectures
    • Place of Presentation
      Pusan National University
    • Year and Date
      20070926-27
  • [Presentation] ユークリッド空間のtightなデザインの新しい例の構成と分類問題について2007

    • Author(s)
      坂内 英一(坂内悦子と連名)
    • Organizer
      日本数学会代数学分科会一般講演
    • Place of Presentation
      東北大学, 仙台
    • Year and Date
      20070900
  • [Presentation] Two 50 minute talks(with no specific title)2007

    • Author(s)
      坂内 英一
    • Organizer
      Workshop on Algebraic Combinatorics
    • Place of Presentation
      Beijing Normal Univ. 北京
    • Year and Date
      20070822-24
  • [Presentation] More about Euclidean designs2007

    • Author(s)
      坂内 悦子
    • Organizer
      有限群論と代数的組合せ論
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2007-12-19
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Distance-Regular Graphs with Extra Regularity2007

    • 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
  • [Presentation] 長さ28の極値的3元自己双対符号の分類2007

    • Author(s)
      Akihiro Munemasa
    • Organizer
      第7回代数学と計算研究集会
    • Place of Presentation
      首都大学東京
    • Year and Date
      2007-12-05
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Non-amorphous association schemes in which all nontrivial relations are strongly regular2007

    • Author(s)
      宗政 昭弘
    • Organizer
      The 22^<nd> PNU-POSTECH Algebraic Combinatorics Seminar
    • Place of Presentation
      Pusan National University, 韓国
    • Year and Date
      2007-11-24
  • [Presentation] Tight designs on sphere and Euclidean spaces2007

    • Author(s)
      坂内 英一
    • Organizer
      AGCY11
    • Place of Presentation
      Luminy, フランス
    • Year and Date
      2007-11-06
  • [Presentation] The augmented tridiagonal algebra2007

    • Author(s)
      Tatsuro Ito
    • Organizer
      Algebras, Groups and Geometries in Tambara
    • Place of Presentation
      Tambara International Seminar House
    • Year and Date
      2007-10-17
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] On Euclidean t-designs2007

    • Author(s)
      Eiichi Bannai and Etsuko Bannai
    • Organizer
      COE Conference on the Development of Dynamic Mathematics with High Funcxionality(DMHF 2007)
    • Place of Presentation
      福岡
    • Year and Date
      2007-10-08
  • [Presentation] Parallelogram-free distance-regular graphs having2007

    • Author(s)
      鈴木 寛
    • Organizer
      The 22^<nd> Algebraic Combinatorics Seminar
    • Place of Presentation
      Pusan National University
    • Year and Date
      2007-09-24
  • [Presentation] A modular absolute bound condition for primitive association schemes2007

    • Author(s)
      Akihide Hanaki
    • Organizer
      Algebras and Combinatorics, Japan-Korea
    • Place of Presentation
      九州大学
    • Year and Date
      2007-09-14
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] 球面上の最適配置入門2007

    • Author(s)
      Akihiro Munemasa
    • Organizer
      応用数学連携フォーラム第1回ワークショップ
    • Place of Presentation
      東北大学情報科学研究科
    • Year and Date
      2007-09-04
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Spherical designs and Euclidean designs2007

    • Author(s)
      坂内 悦子
    • Organizer
      Workshop on Algebraic Combinatorics
    • Place of Presentation
      Beijing Normal University 北京
    • Year and Date
      2007-08-25
  • [Presentation]2007

    • Author(s)
      坂内 英一
    • Organizer
      International Conference on Algebra and Related Topics, in honor of 80^<th> birthday of Professor Zhexian Wan
    • Place of Presentation
      Tsinghua University, 北京
    • Year and Date
      2007-08-20
  • [Presentation] Mass formula for codes2007

    • Author(s)
      Akihiro Munemasa
    • Organizer
      第19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
      2007-08-03
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] ユークリッド空間の$t$・デザインについて2007

    • Author(s)
      坂内 悦子
    • Organizer
      第19回有限群草津セミナー
    • Place of Presentation
      草津セミナーハウス
    • Year and Date
      2007-08-03
  • [Presentation] 28次元の格子と符号2007

    • Author(s)
      原田 昌晃
    • Organizer
      第19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
      2007-08-02
  • [Presentation] Spherical designs and Euclidean designs,a survey2007

    • Author(s)
      坂内 英一
    • Organizer
      Com2Mac Conference on Applications of Group Theory to Combinatorics
    • Place of Presentation
      Pohang, 韓国
    • Year and Date
      2007-07-10
  • [Presentation] Irreducible representations of the Terwilliger algebra of a P-and Q-polynomial association scheme2007

    • Author(s)
      伊藤 達郎
    • Organizer
      The Com^2MaC Conference on Applications of Group Theory to Combinatorics
    • Place of Presentation
      POSTECH, 韓国
    • Year and Date
      2007-07-10
  • [Presentation] The q-Onsager algebra and its finite dimensional irreducinle representa-tions2007

    • Author(s)
      伊藤 達郎
    • Organizer
      The second Internatinal Congress in Algebra and Combinatorics
    • Place of Presentation
      Beihang University, Beijing, China
    • Year and Date
      2007-07-07
  • [Presentation] Spherical designs and Euclidean designs,a survey2007

    • Author(s)
      坂内 英一
    • Organizer
      ICAC07
    • Place of Presentation
      Beihang University, 北京
    • Year and Date
      2007-07-06
  • [Presentation] ユークリッド空間のデザインについて2007

    • Author(s)
      坂内 悦子
    • Organizer
      第24回代数的組合せ論シンポジウム
    • Place of Presentation
      近畿大学
    • Year and Date
      2007-06-30
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] A characterization of some distance-regular graphs by strongly closed subgraphs2007

    • Author(s)
      平木 彰
    • Organizer
      第24回代数的組合せ論シンポジウム
    • Place of Presentation
      近畿大学
    • Year and Date
      2007-06-30
  • [Presentation] Nilpotent,solvable,and monomial schemes2007

    • Author(s)
      Akihide Hanaki
    • Organizer
      第24回代数的組合せ論シンポジウム
    • Place of Presentation
      近畿大学
    • Year and Date
      2007-06-29
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Euclidean designs,cubature formulas,and orthogonal polynomials2007

    • Author(s)
      坂内 英一
    • Organizer
      第24回代数的組合せ論シンポジウム、近畿大学
    • Place of Presentation
      近畿大学
    • Year and Date
      2007-06-28
  • [Presentation] On graphs with complete multipartite $\mu$-graphs2007

    • Author(s)
      宗政 昭弘
    • Organizer
      The 6^<th> Slovenian International Conference on Graph Theory
    • Place of Presentation
      Bled, Slovenia
    • Year and Date
      2007-06-25
  • [Presentation] Codes and lattices of Hadamard matrices2007

    • Author(s)
      宗政 昭弘
    • Organizer
      Design Theory and Its Applications
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2007-06-12
  • [Presentation] Small non-embeddable quasi-derived designs2007

    • Author(s)
      原田 昌晃
    • Organizer
      組合せ的デザイン理論とその応用
    • Place of Presentation
      京都大、数理研
    • Year and Date
      2007-06-12
  • [Presentation] Cubature formulas in numerical analysis and tight Euclidean designs2007

    • Author(s)
      坂内 英一
    • Organizer
      CGCS2007
    • Place of Presentation
      Luminy, フランス
    • Year and Date
      2007-05-02
  • [Presentation] Euclidean tight designs2007

    • Author(s)
      坂内 悦子
    • Organizer
      CGCS2007
    • Place of Presentation
      Luminy, フランス
    • Year and Date
      2007-05-02
  • [Presentation] Spherical and Euclidean designs,cubature formulas,and orthogonal polynomials2007

    • Author(s)
      坂内 英一
    • Organizer
      談話会
    • Place of Presentation
      University of Magdeburgドイツ
    • Year and Date
      2007-04-27
  • [Presentation] Euclidean tight designs2007

    • Author(s)
      坂内 悦子
    • Organizer
      談話会
    • Place of Presentation
      Magdeburg大学, ドイツ
    • Year and Date
      2007-04-27

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Published: 2010-02-04   Modified: 2016-04-21  

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