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Study on relationship among ring theoretic invariants for non Cohen-Macaulay rings

Research Project

Project/Area Number 20K03550
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 11010:Algebra-related
Research InstitutionKitami Institute of Technology

Principal Investigator

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

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2023: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2022: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2021: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Keywordsエッジイデアル / Stanley-Reisner環 / 次元 / Castelnuovo-Mumford正則度 / 余次元 / マッチング数 / 最小マッチング数 / 誘導マッチング数 / Cohen-Macaulay / Gorenstein / 独立数 / Coq / 形式化 / Cameron-Walkerグラフ / h多項式の次数 / Cohen-Macaulay type / 深度 / 非 Cohen-Macaulay 環 / Castelnuovo-Mumford 正則度 / h 多項式 / extremal ベッチ数
Outline of Research at the Start

次元および深度は, 可換環論における重要な不変量である. 一般に次元は深度以上であり, 両者が等しい環として Cohen-Macaulay 環が定義される. 本研究では, 次元, 深度に加えて Castelnuovo-Mumford 正則度, h 多項式の次数, extremal ベッチ数の個数, の5種の不変量を研究対象とする. Cohen-Macaulay 環におけるこれらの不変量の相互関係は良く知られているが, 非 Cohen-Macaulay 環においては, 同様の研究はあまりされていない. そこで, 非 Cohen-Macaulay 環における上記5種の不変量の相互関係を研究する.

Outline of Final Research Achievements

For quotient rings of polynomial rings by edge ideals associated with finite simple graphs, we found some relationships between ring-theoretic invariants (dimension, depth, the degree of h-polynomials, Castelnuovo-Mumford regularity and codimension) and graph-theoretic invariants (matching number, minimum matching number, induced matching number, the number of vertices and the number of edges).
Moreover, wee also found an inequality for dimension, Castelnuovo-Mumford regularity and Cohen-Macaulay type of Cohen-Macaulay Stanley-Reisner rings.

Academic Significance and Societal Importance of the Research Achievements

エッジイデアルに関する一連の研究において、グラフ理論に関するいくつかの研究成果を用いた。またその逆に、純粋なグラフ理論の問題を解決し、それを応用してエッジイデアルについての研究成果が出せたこともあった。両分野の結びつきの強さを知らしめるような結果が出せたことに意義を感じる。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (18 results)

All 2024 2023 2022 2021 2020 Other

All Int'l Joint Research (2 results) Journal Article (7 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 7 results,  Open Access: 1 results) Presentation (7 results) (of which Invited: 5 results) Remarks (2 results)

  • [Int'l Joint Research] McMaster University(カナダ)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] McMaster University(カナダ)

    • Related Report
      2020 Research-status Report
  • [Journal Article] On the three graph invariants related to matching of finite simple graphs2024

    • Author(s)
      Kazunori Matsuda, Yuichi Yoshida
    • Journal Title

      Journal of Algebra Combinatorics Discrete Structures and Applications

      Volume: -

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The regularity and h-polynomial of Cameron-Walker graphs2022

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

      Enumerative Combinatorics and Applications

      Volume: 2 Issue: 3 Pages: Article #S2R17-Article #S2R17

    • DOI

      10.54550/eca2022v2s3r17

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Regularity and h-polynomials of binomial edge ideals2022

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

      Acta Mathematica Vietnamica

      Volume: 47 Issue: 1 Pages: 369-374

    • DOI

      10.1007/s40306-021-00416-3

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Inequalities of invariants on Stanley-Reisner rings of Cohen-Macaulay simplicial complexes2022

    • Author(s)
      Akihiro Higashitani, Hiroju Kanno, Kazunori Matsuda
    • Journal Title

      Journal of Pure and Applied Algebra

      Volume: 226 Issue: 7 Pages: 106888-106888

    • DOI

      10.1016/j.jpaa.2021.106888

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Regularity and a-invariant of Cameron?Walker graphs2021

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

      Journal of Algebra

      Volume: 584 Pages: 215-242

    • DOI

      10.1016/j.jalgebra.2021.05.007

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Matching Numbers and Dimension of Edge Ideals2021

    • Author(s)
      Ayana Hirano, Kazunori Matsuda
    • Journal Title

      Graphs and Combinatorics

      Volume: 37 Issue: 3 Pages: 761-774

    • DOI

      10.1007/s00373-021-02277-x

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Homological invariants of Cameron-Walker graphs2021

    • Author(s)
      Hibi Takayuki、Kanno Hiroju、Kimura Kyouko、Matsuda Kazunori、Van Tuyl Adam
    • Journal Title

      Transactions of the American Mathematical Society

      Volume: ー Issue: 9 Pages: 6559-6582

    • DOI

      10.1090/tran/8416

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Gorenstein二次代数のKoszul性に関するMastroeni-Schenck-StillmanのQuestionについてのサーベイ2023

    • Author(s)
      松田 一徳
    • Organizer
      東京可換環論セミナー
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 連結単純グラフのマッチングに付随する3種の不変量2023

    • Author(s)
      吉田 裕一, 松田 一徳
    • Organizer
      日本数学会2023年度年会
    • Related Report
      2022 Research-status Report
  • [Presentation] Gorenstein binomial edge ideals ~arXiv:2102.11188 の論文紹介~2021

    • Author(s)
      松田 一徳
    • Organizer
      特異点セミナー
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Homological invariants of Cameron-Walker graphs2021

    • Author(s)
      松田 一徳
    • Organizer
      東京可換環論セミナー
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] Gorenstein graphic matroids2020

    • Author(s)
      松田 一徳
    • Organizer
      オンライン研究集会 組合せ論と可換環論
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] The regularity and h-polynomial of Cameron-Walker graphs2020

    • Author(s)
      日比 孝之、木村 杏子、松田 一徳、Adam Van Tuyl
    • Organizer
      日本数学会2020年度秋季総合分科会
    • Related Report
      2020 Research-status Report
  • [Presentation] 単項式イデアルの環論的不変量の相互関係について2020

    • Author(s)
      松田 一徳
    • Organizer
      日本数学会北海道支部講演会
    • Related Report
      2020 Research-status Report
    • Invited
  • [Remarks] 北見工業大学 研究者総覧

    • URL

      https://hanadasearch.office.kitami-it.ac.jp/searchja/show/id/1331

    • Related Report
      2023 Annual Research Report
  • [Remarks] 北見工業大学 研究者総覧

    • URL

      http://hanadasearch.office.kitami-it.ac.jp/searchja/show/id/1331

    • Related Report
      2022 Research-status Report 2021 Research-status Report 2020 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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