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Stratification of Cohen-Macaulay rings

Research Project

Project/Area Number 20K14299
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 11010:Algebra-related
Research InstitutionMeiji University (2020, 2022-2023)
Tokyo University of Science (2021)

Principal Investigator

Endo Naoki  明治大学, 政治経済学部, 専任講師 (30782510)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
KeywordsGoto環 / Cohen-Macaulay環 / Gorenstein環 / 正準イデアル / Sally加群 / Ulrichイデアル / 拡大正準イデアル / Almost Gorenstein環 / Arf環 / Weakly Arf環
Outline of Research at the Start

本研究の主題は可換環論である。現代可換環論の研究領域は多岐に渡るが, 本研究では「Cohen-Macaulay環の階層化問題」に従事する。即ち,可換環論の中でも最重要の研究対象であるCohen-Macaulay環に対して,新たな環のクラスを提示し,Gorenstein性との差異を指標とした階層化を通して,可換環論に新たな展望を齎すことを目標とする。

Outline of Final Research Achievements

In this research, we proposed the notion of Goto rings as a generalization of almost Gorensein rings. The background to this is that almost Gorenstein rings, as the name suggests, are a concept that is as close as possible to Gorenstein rings among non-Gorenstein rings. From the preceding researches so far, we encountered non-almost Gorenstein rings, but some of which still have good structures. Thus, time has come to generalize almost Gorenstein rings. We constructed and developed a basic theory of Goto rings and provided a wealth of concrete examples, keeping in mind the ripple effect of the theory on related fields in the future.

Academic Significance and Societal Importance of the Research Achievements

本研究では「Cohen-Macaulay環の階層化問題」に対する回答として, Goto環の概念を提案した。Gorenstein環とCohen-Macaulay環は, 現代可換環論を大きく飛躍させるに至った両翼であるにも関わらず, これら2つの環の差異の度合いに関しては, almost Gorenstein環を除き殆ど解析されていない。環の細分化という従来の願望に応えるという観点から, これら2つの環の間の階層化は重要な課題であり, 関連分野の発展にとっても, Cohen-Macaulay環の魅力的で発展性のある新しいクラスが提示され, 解析されることの意義は少なくないと判断される。

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

    (49 results)

All 2024 2023 2022 2021 2020 Other

All Int'l Joint Research (6 results) Journal Article (20 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 20 results,  Open Access: 1 results) Presentation (19 results) (of which Int'l Joint Research: 8 results,  Invited: 10 results) Remarks (2 results) Funded Workshop (2 results)

  • [Int'l Joint Research] West Virginia University/Southern Connecticut State University/The City University of New York(米国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] West Virginia University/North Dakota State University/The City University of New York(米国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] Tata Institute of Fandamental Research(インド)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] Jagiellonian University(ポーランド)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] West Virginia University(米国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] West Virginia University/North Dakota State University(米国)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Reflexive modules over the endomorphism algebras of reflexive trace ideals2024

    • Author(s)
      Endo Naoki and Goto Shiro
    • Journal Title

      Journal of Pure and Applied Algebra

      Volume: 印刷中 Issue: 8 Pages: 107662-107662

    • DOI

      10.1016/j.jpaa.2024.107662

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Ulrich ideals in the ring k[[t^5,t^11]]2024

    • Author(s)
      Naoki Endo, Shiro Goto, Shin-ichiro Iai, and Naoyuki Matsuoka
    • Journal Title

      International Journal of Algebra and Computation

      Volume: 印刷中

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Rings with q-torsionfree canonical modules2024

    • Author(s)
      Naoki Endo, Laura Ghezzi, Shiro Goto, Jooyoun Hong, Shin-ichiro Iai, Toshinori Kobayashi, Naoyuki Matsuoka, and Ryo Takahashi
    • Journal Title

      The Mathematical Legacy of Wolmer V. Vasconcelos, De Gruyter Proceedings in Mathematics

      Volume: 印刷中

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Remarks on almost Gorenstein rings2024

    • Author(s)
      Endo Naoki and Matsuoka Naoyuki
    • Journal Title

      Communications in Algebra

      Volume: 52 Issue: 7 Pages: 2884-2891

    • DOI

      10.1080/00927872.2024.2310163

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] On the Weakly Arf (S2)-ifications of Noetherian rings2023

    • Author(s)
      Endo Naoki, Goto Shiro, Iai Shin-ichiro, and Matsuoka Naoyuki
    • Journal Title

      Journal of Commutative Algebra

      Volume: 15 Issue: 3 Pages: 303-319

    • DOI

      10.1216/jca.2023.15.303

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] On the ubiquity of Arf rings2023

    • Author(s)
      Celikbas Ela, Celikbas Olgur, Ciuperca Catalin, Endo Naoki, Goto Shiro, Isobe Ryotaro, and Matsuoka Naoyuki
    • Journal Title

      Journal of Commutative Algebra

      Volume: 15 Issue: 2 Pages: 177-231

    • DOI

      10.1216/jca.2023.15.177

    • Related Report
      2023 Annual Research Report 2022 Research-status Report 2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] On the weakly Arf (S_2)-ifications of Noetherian rings2023

    • Author(s)
      Naoki Endo, Shiro Goto, Shin-ichiro Iai, and Naoyuki Matsuoka
    • Journal Title

      Journal of Commutative Algebra

      Volume: 印刷中

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] When are the rings I:I Gorenstein?2023

    • Author(s)
      Naoki Endo, Shiro Goto, Shin-ichiro Iai, and Naoyuki Matsuoka
    • Journal Title

      Communications in Algebra

      Volume: 51 Issue: 4 Pages: 1721-1734

    • DOI

      10.1080/00927872.2022.2141764

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Almost Gorenstein determinantal rings of symmetric matrices2022

    • Author(s)
      Ela Celikbas, Naoki Endo, Jai Laxmi, and Jerzy Weyman
    • Journal Title

      Communications in Algebra

      Volume: 50 Issue: 12 Pages: 5449-5458

    • DOI

      10.1080/00927872.2022.2086260

    • Related Report
      2022 Research-status Report 2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Ulrich ideals in numerical semigroup rings of small multiplicity2022

    • Author(s)
      Endo Naoki and Goto Shiro
    • Journal Title

      Journal of Algebra

      Volume: 611 Pages: 435-479

    • DOI

      10.1016/j.jalgebra.2022.08.016

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Topics on strict closure of rings2021

    • Author(s)
      Endo Naoki、Goto Shiro、Isobe Ryotaro
    • Journal Title

      Research in the Mathematical Sciences

      Volume: 8 Issue: 4

    • DOI

      10.1007/s40687-021-00292-1

    • Related Report
      2022 Research-status Report 2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Almost Gorenstein rings arising from fiber products2021

    • Author(s)
      Endo Naoki、Goto Shiro、Isobe Ryotaro
    • Journal Title

      Canadian Mathematical Bulletin

      Volume: 64 Issue: 2 Pages: 383-400

    • DOI

      10.4153/s000843952000051x

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Construction of strictly closed rings2021

    • Author(s)
      E. Naoki, S. Goto
    • Journal Title

      Proceedings of the American Mathematical Society

      Volume: 150 Issue: 01 Pages: 119-129

    • DOI

      10.1090/proc/15659

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Construction of strictly closed rings2021

    • Author(s)
      Naoki Endo, Shiro Goto
    • Journal Title

      Proceedings of the American Mathematical Society

      Volume: 印刷中

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Almost Gorenstein rings arising from fiber products2021

    • Author(s)
      Naoki Endo, Shiro Goto, and Ryotaro Isobe
    • Journal Title

      Canadian Mathematical Bulletin

      Volume: 印刷中

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] On modules with reducible complexity2020

    • Author(s)
      Olgur Celikbas, Arash Sadeghi, and Naoki Taniguchi
    • Journal Title

      Algebras and Representation Theory

      Volume: 23 Issue: 4 Pages: 1467-1476

    • DOI

      10.1007/s10468-019-09899-z

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A study of quasi-Gorenstein rings II: Deformation of quasi-Gorenstein property2020

    • Author(s)
      Kazuma Shimomoto, Naoki Taniguchi, Ehsan Tavanfar
    • Journal Title

      Journal of Algebra

      Volume: 562 Pages: 368-389

    • DOI

      10.1016/j.jalgebra.2020.06.032

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Efficient generation of ideals in core subalgebras of the polynomial ring $k[t]$ over a field $k$2020

    • Author(s)
      Endo Naoki、Goto Shiro、Matsuoka Naoyuki、Yamamoto Yuki
    • Journal Title

      Proceedings of the American Mathematical Society

      Volume: 148 Issue: 8 Pages: 3283-3292

    • DOI

      10.1090/proc/15032

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] On Ratliff-Rush closure of modules2020

    • Author(s)
      Naoki Endo
    • Journal Title

      Mathematica Scandinavica

      Volume: 126 Issue: 2 Pages: 170-188

    • DOI

      10.7146/math.scand.a-119672

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Ulrich ideals and 2-AGL rings2020

    • Author(s)
      Shiro Goto, Ryotaro Isobe, and Naoki Taniguchi
    • Journal Title

      Journal of Algebra

      Volume: 555 Pages: 96-130

    • DOI

      10.1016/j.jalgebra.2020.01.028

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] Sally modules of extended canonical ideals and Goto rings2024

    • Author(s)
      遠藤 直樹
    • Organizer
      日本数学会2024年度年会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Graded ideals whose quotient rings are Gorenstein2023

    • Author(s)
      遠藤 直樹
    • Organizer
      日本数学会2023年度秋季総合分科会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Ideals whose quotient rings are Gorenstein2023

    • Author(s)
      遠藤 直樹
    • Organizer
      第34回可換環論セミナー
    • Related Report
      2023 Annual Research Report
  • [Presentation] On the stratification of one-dimensional Cohen-Macaulay rings2023

    • Author(s)
      遠藤 直樹
    • Organizer
      日本数学会2023年度年会
    • Related Report
      2022 Research-status Report
  • [Presentation] Generalization of Gorenstein rings -from the past to the future-2023

    • Author(s)
      Naoki Endo
    • Organizer
      The 11th Japan-Vietnam Joint seminar on Commutative Algebra, by and for young mathematicians
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Ulrich ideals and numerical semigroup rings2022

    • Author(s)
      Naoki Endo
    • Organizer
      INdAM workshop: International meeting on numerical semigroups - Roma 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Ulrich ideals in numerical semigroup rings2022

    • Author(s)
      遠藤 直樹
    • Organizer
      第33回可換環論セミナー
    • Related Report
      2022 Research-status Report
  • [Presentation] Reflexive modules over the endomorphism algebras of reflexive trace ideals2022

    • Author(s)
      遠藤 直樹, 後藤 四郎
    • Organizer
      日本数学会2022年度秋季総合分科会
    • Related Report
      2022 Research-status Report
  • [Presentation] Almost Gorenstein Determinantal Rings of Symmetric Matrices2022

    • Author(s)
      Ela Celikbas, Naoki Endo, Jai Laxmi, and Jerzy Weyman
    • Organizer
      AMS Fall Southeastern Sectional Meeting, Special Session on Combinatorial Commutative Algebra
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Reflexive modules over the endomorphism algebras of reflexive trace ideals2022

    • Author(s)
      Naoki Endo and Shiro Goto
    • Organizer
      The 43rd Japan Symposium on Commutative Algebra
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] The category of reflexive modules over one-dimensional Cohen-Macaulay rings2022

    • Author(s)
      遠藤 直樹
    • Organizer
      東京可換環論セミナー
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] The Gorensteinness of the endomorphism rings of ideals2022

    • Author(s)
      遠藤 直樹
    • Organizer
      特異点論月曜セミナー
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] When are the endomorphism rings of ideals Gorenstein?2022

    • Author(s)
      Naoki Endo
    • Organizer
      Commutative Algebra and Algebraic Geometry Seminar at the City University of New York
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Ulrich ideals with smallest number of generators2021

    • Author(s)
      Naoki Endo
    • Organizer
      The 42nd Symposium on Commutative Algebra
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Cohen-Macaulay環の階層化問題2021

    • Author(s)
      遠藤 直樹
    • Organizer
      神楽坂代数セミナー
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Strict closure of rings2021

    • Author(s)
      遠藤 直樹
    • Organizer
      東京可換環論セミナー
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Arf closure versus strict closure2020

    • Author(s)
      遠藤直樹
    • Organizer
      可換環論オンラインワークショップ
    • Related Report
      2020 Research-status Report
  • [Presentation] Weakly Arf rings2020

    • Author(s)
      Naoki Endo
    • Organizer
      AMS Fall Eastern Virtual Sectional Meeting, Special Session on Homological Methods in Algebra
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On weakly Arf rings2020

    • Author(s)
      Naoki Endo
    • Organizer
      AMS Spring Central Sectional Meeting, Special Session on Commutative Algebra and Connections with Algebraic Geometry
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Remarks] Naoki Endoのweb page

    • URL

      https://www.isc.meiji.ac.jp/~endo/

    • Related Report
      2023 Annual Research Report 2022 Research-status Report 2021 Research-status Report
  • [Remarks] Naoki Endoのweb page

    • URL

      https://www.rs.tus.ac.jp/nendo/

    • Related Report
      2020 Research-status Report
  • [Funded Workshop] 第44回可換環論シンポジウム2023

    • Related Report
      2023 Annual Research Report
  • [Funded Workshop] The 11th Japan-Vietnam Joint seminar on Commutative Algebra, by and for young mathematicians2023

    • Related Report
      2022 Research-status Report

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

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