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Diversified study of Koszul algebra

Research Project

Project/Area Number 17K14165
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Algebra
Research InstitutionKitami Institute of Technology (2018-2019)
Osaka University (2017)

Principal Investigator

Matsuda Kazunori  北見工業大学, 工学部, 准教授 (20633241)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
KeywordsKoszul代数 / Castelnuovo-Mumford正則度 / h多項式 / 極値的ベッチ数 / エッジイデアル / マッチング数 / 誘導マッチング数 / Cameron-Walkerグラフ / グラフィックマトロイド / 最小マッチング数 / Cameron-Walker グラフ / Castelnuovo-Mumford 正則度 / h 多項式 / linear resolution / edge ring / 組合せ論的可換環論 / 次数付き代数 / トーリック環 / トーリックイデアル
Outline of Final Research Achievements

The notion of Koszul algebra is defined for standard graded quadratic algebras. The purpose of this research is to study Koszul algebra from the point of view of (1) research on ring-theoretic invariants which are closely related to Koszul algebra, (2) research on the relationship between Koszulness and other ring-theoretic properties, (3) construction of examples of Koszul algebras. Our results are as follows:
1. For any positive integers r and s, we prove that there exists a Koszul algebra such that its Castelnuovo-Mumford regularity is r and its degree of h-polynomial is s.
2. We have several results on the edge ideal, it is known that its quotient ring is Koszul.

Academic Significance and Societal Importance of the Research Achievements

研究実施計画において取り組む課題に挙げていた、埋入次元が6以下またはCastelnuovo-Mumford正則度が3のKoszulでないGorenstein二次代数の構成については、Mastroeni-Schenck-Stillmanによる2本のプレプリント(arxiv:1903.08265、arXiv:1903.08273)に先を越される結果となった。しかしながら、研究代表者による例(埋入次元が7でCastelnuovo-Mumford正則度が4のもの)がこの研究のきっかけとなった点では、意義があったと思われる。
また、エッジイデアルの研究の発展に貢献できたことも評価できる。

Report

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

    (32 results)

All 2020 2019 2018 2017 Other

All Int'l Joint Research (5 results) Journal Article (11 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 9 results,  Open Access: 1 results) Presentation (15 results) (of which Int'l Joint Research: 1 results,  Invited: 3 results) Remarks (1 results)

  • [Int'l Joint Research] Polish Academy of Sciences(ポーランド)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Max Planck Institute(ドイツ)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Aalto University(フィンランド)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] McMaster University(カナダ)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] McMaster 大学(カナダ)

    • Related Report
      2018 Research-status Report
  • [Journal Article] Toric rings and ideals of stable set polytopes2019

    • Author(s)
      Kazunori Matsuda, Hidefumi Ohsugi, Kazuki Shibata
    • Journal Title

      Mathematics

      Volume: 7 Issue: 7 Pages: 613-613

    • DOI

      10.3390/math7070613

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Induced matching numbers of finite graphs and edge ideals2019

    • Author(s)
      Hibi Takayuki、Kanno Hiroju、Matsuda Kazunori
    • Journal Title

      Journal of Algebra

      Volume: 532 Pages: 311-322

    • DOI

      10.1016/j.jalgebra.2019.04.036

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Extremal Betti numbers of edge ideals2019

    • Author(s)
      Takayuki Hibi, Kyouko Kimura, Kazunori Matsuda
    • Journal Title

      Archiv der Mathematik

      Volume: 印刷中 Issue: 2 Pages: 149-155

    • DOI

      10.1007/s00013-019-01322-9

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Lexsegment Ideals and Their h-Polynomials2019

    • Author(s)
      Takayuki Hibi, Kazunori Matsuda
    • Journal Title

      Acta Mathematica Vietnamica

      Volume: 44 Issue: 1 Pages: 83-86

    • DOI

      10.1007/s40306-018-0297-5

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Regularity and h-polynomials of edge ideals2019

    • Author(s)
      Takayuki Hibi, Kazunori Matsuda, Adam Van Tuyl
    • Journal Title

      The Electronic Journal of Combinatorics

      Volume: ー

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Nonincreasing depth functions of monomial ideals2018

    • Author(s)
      Kazunori Matsuda, Tao Suzuki, Akiyoshi Tsuchiya
    • Journal Title

      Glasgow Mathematical Journal

      Volume: 印刷中

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Weakly closed graphs and F-purity of binomial edge ideals2018

    • Author(s)
      Kazunori Matsuda
    • Journal Title

      Algebra Colloquium

      Volume: 印刷中

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Non-Koszul quadratic Gorenstein toric rings2018

    • Author(s)
      Kazunori Matsuda
    • Journal Title

      Mathematica Scandinavica

      Volume: 印刷中

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Quadratic Grobner bases arising from partially ordered sets2017

    • Author(s)
      Hibi Takayuki、Matsuda Kazunori、Tsuchiya Akiyoshi
    • Journal Title

      Mathematica Scandinavica

      Volume: 121 Issue: 1 Pages: 19-25

    • DOI

      10.7146/math.scand.a-26246

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Edge rings with 3-linear resolutions2017

    • Author(s)
      Takayuki Hibi, Kazunori Matsuda, Akiyoshi Tsuchiya
    • Journal Title

      arXiv:1712.03504

      Volume: -

    • Related Report
      2017 Research-status Report
  • [Journal Article] Regularity and h-polynomials of monomial ideals2017

    • Author(s)
      Takayuki Hibi, Kazunori Matsuda
    • Journal Title

      arXiv:1711.02002

      Volume: -

    • Related Report
      2017 Research-status Report
  • [Presentation] 単純グラフの3種のマッチング数とエッジイデアルの次元について2020

    • Author(s)
      平野 文菜, 松田 一徳
    • Organizer
      日本数学会2020年度年会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Gorenstein graphic matroids2019

    • Author(s)
      Kazunori Matsuda
    • Organizer
      Commutative Algebra and Lattice Polytopes
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 有限単純グラフの binomial edge ideal2019

    • Author(s)
      松田 一徳
    • Organizer
      組合せ論と可換代数オータムセミナー
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Regularity and a-invariants of Cameron-Walker graphs2019

    • Author(s)
      日比 孝之, 木村 杏子, 松田 一徳, 土谷昭善
    • Organizer
      日本数学会2019年度秋季総合分科会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Induced matching numbers of finite graphs and edge ideals2019

    • Author(s)
      菅野 裕樹, 日比 孝之, 松田 一徳
    • Organizer
      日本数学会2019年度秋季総合分科会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Regularity and a-invariants of Cameron-Walker graphs2019

    • Author(s)
      松田 一徳
    • Organizer
      第32回可換環論セミナー
    • Related Report
      2019 Annual Research Report
  • [Presentation] エッジイデアルの extremal ベッチ数2019

    • Author(s)
      日比 孝之, 木村 杏子, 松田 一徳
    • Organizer
      日本数学会2019年度年会
    • Related Report
      2018 Research-status Report
  • [Presentation] Castelnuovo-Mumford正則度とh多項式の次数についてI, II2018

    • Author(s)
      松田 一徳
    • Organizer
      第22回静岡代数学セミナー
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] Edge rings with 3-linear resolutions2018

    • Author(s)
      土谷 昭善, 日比 孝之, 松田 一徳
    • Organizer
      日本数学会2018年度秋季総合分科会
    • Related Report
      2018 Research-status Report
  • [Presentation] Lexsegment ideals and their h-polynomials2018

    • Author(s)
      日比 孝之, 松田 一徳
    • Organizer
      第40回可換環論シンポジウム
    • Related Report
      2018 Research-status Report
  • [Presentation] 単項式イデアルの Castelnuovo-Mumford 正則度と h 多項式の次数について2018

    • Author(s)
      日比孝之, 松田一徳
    • Organizer
      日本数学会2018年度年会
    • Related Report
      2017 Research-status Report
  • [Presentation] Regularity and h-polynomials of monomial ideals2018

    • Author(s)
      松田一徳
    • Organizer
      第30回可換環論セミナー
    • Related Report
      2017 Research-status Report
  • [Presentation] Regularity and h-polynomials of monomial ideals2017

    • Author(s)
      松田一徳
    • Organizer
      日本大学特異点論月曜セミナー
    • Related Report
      2017 Research-status Report
  • [Presentation] 順序凸多面体の対の正規性について2017

    • Author(s)
      松田一徳
    • Organizer
      日本数学会2017年度秋季総合分科会
    • Related Report
      2017 Research-status Report
  • [Presentation] Introduction to Hibi rings (1), (2)2017

    • Author(s)
      松田一徳
    • Organizer
      第14回可換環論サマースクール
    • Related Report
      2017 Research-status Report
  • [Remarks] researchmap

    • URL

      https://researchmap.jp/kazmatsuda/

    • Related Report
      2019 Annual Research Report 2018 Research-status Report

URL: 

Published: 2017-04-28   Modified: 2021-02-19  

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