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Construction of the Delsarte theory for quotient sets

Research Project

Project/Area Number 16K17569
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Algebra
Research InstitutionAichi University of Education

Principal Investigator

Nozaki Hiroshi  愛知教育大学, 教育学部, 准教授 (80632778)

Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywordsグラフの固有値 / ハイパーグラフ / 線形計画限界 / Delsarte理論 / アソシエーションスキーム / 距離正則グラフ / スペクトラルギャップ / 正則グラフ / デザイン / 符号 / スペクトルギャップ / s-距離集合 / デルサルト理論 / 代数的組合せ論 / 固有値
Outline of Final Research Achievements

The eigenvalues of the adjacency matrix of a graph is called the eigenvalues of the graph. The difference of the degree and the second-largest eigenvalue of a regular graph is called the spectral gap, and the graph which has a large spectral gap has high connectivity in some sense. There are some methods to obtain an upper bound on the number of vertices, so called linear programming bounds. In this research project, we proved the analogous theory of the method for regular bipartite graphs, and extended the theory for regular uniform hypergraphs. Using the linear programming method for regular uniform hypergraphs, we improved and generalized some known results.

Academic Significance and Societal Importance of the Research Achievements

Delsarte理論とは,アソシエーションスキームまたはランク1対称空間の部分集合に対して,種々の組合せ論的対象に統一的な枠組みを与える理論である.正則一様なハイパーグラフに対する線形計画限界は,Delsarte理論の商集合版にあたり,組合せデザインを初めとする,ある種の正則性を持つ組合せ論的対象に応用可能な理論である.正則一様なハイパーグラフに対する線形計画限界を用いて,アソシエーションスキームの枠組みを超えた,スペクトル理論への応用が期待できる.

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (28 results)

All 2020 2019 2018 2017 2016 Other

All Int'l Joint Research (4 results) Journal Article (6 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 6 results,  Open Access: 6 results,  Acknowledgement Compliant: 2 results) Presentation (15 results) (of which Int'l Joint Research: 7 results,  Invited: 4 results) Remarks (3 results)

  • [Int'l Joint Research] Univ. of Science and Technology of China(中国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] University of Delaware(米国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] University of Delaware(米国)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] Univ. of Science and Technology of China(中国)

    • Related Report
      2018 Research-status Report
  • [Journal Article] Largest regular multigraphs with three distinct eigenvalues2019

    • Author(s)
      Hiroshi Nozaki
    • Journal Title

      Discrete Mathematics

      Volume: 342 Issue: 7 Pages: 2134-2138

    • DOI

      10.1016/j.disc.2019.04.016

    • NAID

      120006732118

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A spectral version of the Moore problem for bipartite regular graphs2019

    • Author(s)
      Sebastian Cioaba, Jack, Koolen, Hiroshi Nozaki
    • Journal Title

      Algebraic Combinatorics

      Volume: 2 Issue: 6 Pages: 1219-1238

    • DOI

      10.5802/alco.71

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A spectral version of the Moore problem for bipartite regular graphs2019

    • Author(s)
      Sebastian Cioaba, Jack Koolen, Hiroshi Nozaki
    • Journal Title

      Algebraic Combinatorics

      Volume: 印刷中

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Complex Spherical Codes with Three Inner Products2018

    • Author(s)
      Nozaki Hiroshi、Suda Sho
    • Journal Title

      Discrete & Computational Geometry

      Volume: 60 Issue: 2 Pages: 294-317

    • DOI

      10.1007/s00454-018-0017-x

    • NAID

      120006729497

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Maximal m-distance sets containing the representation of the Hamming graph H(n,m)2017

    • Author(s)
      Saori Adachi, Rina Hayashi, Hiroshi Nozaki, Chika Yamamoto
    • Journal Title

      Discrete math.

      Volume: 340 Issue: 3 Pages: 430-442

    • DOI

      10.1016/j.disc.2016.08.028

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Maximizing the order of a regular graph of given valency and second eigenvalue2016

    • Author(s)
      S.M. Cioaba, J.H. Koolen, H. Nozaki, J.R. Vermette
    • Journal Title

      SIAM J. Discrete Math.

      Volume: 30 Issue: 3 Pages: 1509-1525

    • DOI

      10.1137/15m1030935

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Presentation] Linear programming methods to obtain bounds on the order of regular graphs2020

    • Author(s)
      Hiroshi Nozaki
    • Organizer
      Joint Workshop on Algebraic Combinatorics and Cryptography
    • Related Report
      2019 Annual Research Report
  • [Presentation] Linear programming bounds for regular uniform hypergraphs2019

    • Author(s)
      Hiroshi Nozaki
    • Organizer
      The 22nd Conference of the International Linear Algebra Society
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Maximal 2-distance sets containing the regular simplex2019

    • Author(s)
      Hiroshi Nozaki
    • Organizer
      Tenth Discrete Geometry and Algebraic Combinatorics Conference
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Linear programming bounds for regular uniform hypergraphs2019

    • Author(s)
      Hiroshi Nozaki
    • Organizer
      Sendai Workshop on Combinatorics
    • Related Report
      2019 Annual Research Report
  • [Presentation] 正則一様ハイパーグラフにおける線形計画限界について2019

    • Author(s)
      野崎寛
    • Organizer
      日本数学会2019年度秋季総合分科会(応用数学)
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Maximizing the order of regular bipartite graphs for given valency and second eigenvalue2018

    • Author(s)
      Hiroshi Nozaki
    • Organizer
      The Japanese Conference on Combinatorics and its Applications 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Maximal 2-distance sets containing the regular simplex2018

    • Author(s)
      Hiroshi Nozaki
    • Organizer
      Research on algebraic combinatorics, related groups and algebras
    • Related Report
      2018 Research-status Report
  • [Presentation] Linear programming bounds for regular uniform hypergraphs2018

    • Author(s)
      Hiroshi Nozaki
    • Organizer
      スペクトラルグラフ理論および周辺領域 第 7 回研究集会
    • Related Report
      2018 Research-status Report
  • [Presentation] Maximizing the order of regular bipartite graphs for given valency and second eigenvalue2018

    • Author(s)
      野崎寛
    • Organizer
      日本数学会 2018 年度年会
    • Related Report
      2017 Research-status Report
  • [Presentation] 第二固有値を固定したときの連結正則二部グラフの頂点数に対する上界2017

    • Author(s)
      野崎寛
    • Organizer
      第34回代数的組合せ論シンポジウム
    • Related Report
      2017 Research-status Report
  • [Presentation] Maximizing the order of regular bipartite graphs for given valency and second eigenvalue2017

    • Author(s)
      Hiroshi Nozaki
    • Organizer
      International Workshop on Bannai-Ito Theory
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Maximizing the order of a regular bipartite graph of given second eigenvalue2017

    • Author(s)
      野崎寛
    • Organizer
      代数的組合せ論および有限群・頂点作用素代数とその表現の研究
    • Related Report
      2017 Research-status Report
  • [Presentation] Largest regular multigraphs with three distinct eigenvalues2016

    • Author(s)
      H. Nozaki
    • Organizer
      Australasian Conference on Combinatorial Mathematics and Combinatorial Computing
    • Place of Presentation
      ニューカッスル(オーストラリア)
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Largest regular digraphs with three eigenvalues2016

    • Author(s)
      H. Nozaki
    • Organizer
      International Workshop on Algebraic Combinatorics
    • Place of Presentation
      合肥(中国)
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Maximal m-distance sets containing the representation of the Hamming graph H(n,m)2016

    • Author(s)
      H. Nozaki
    • Organizer
      The Japanese Conference on Combinatorics and its Applications
    • Place of Presentation
      京都大学 (京都府・京都市)
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Remarks] Hiroshi Nozaki

    • URL

      https://hnozaki.jimdofree.com/

    • Related Report
      2019 Annual Research Report
  • [Remarks] Hiroshi Nozaki

    • URL

      https://hnozaki.jimdo.com/

    • Related Report
      2018 Research-status Report
  • [Remarks] Home page - Hiroshi Nozaki

    • URL

      https://hnozaki.jimdo.com/

    • Related Report
      2017 Research-status Report 2016 Research-status Report

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Published: 2016-04-21   Modified: 2021-02-19  

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