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2019 Fiscal Year Annual Research Report

Thick subcategories and dimensions of derived categories of commutative rings

Research Project

Project/Area Number 16K05098
Research InstitutionNagoya University

Principal Investigator

高橋 亮  名古屋大学, 多元数理科学研究科, 准教授 (40447719)

Project Period (FY) 2016-04-01 – 2020-03-31
Keywords三角圏 / 局所化部分圏 / 導来圏 / thick部分圏
Outline of Annual Research Achievements

三角圏の局所化部分圏(localizing subcategory)とは、直和を取る操作で閉じた充満三角部分圏のことである。局所化部分圏の研究において最も主要なテーマの一つが、与えられた三角圏に対しそれの局所化部分圏をすべて分類するというものである。具体的には、任意の局所化部分圏を別のよりわかりやすいもので表現することを意味する。最初の分類定理は1992年にNeemanによって与えられた。Neemanは、可換ネーター環の非有界導来圏の局所化部分圏全体と素イデアルの集合全体の間に一対一対応を作り、それを与える全単射もexplicitに与えた。近年、三角圏の局所化部分圏の研究は数学の多くの分野にまたがって広く深く行われている。

局所化部分圏は特にthick部分圏になることが知られており、導来圏の局所化部分圏の分類研究は本研究課題に直結するものである。本年度は、可換ネーター環の非有界導来圏の局所化部分圏のうち「n一様」(n-uniform)と呼ぶものを定義した(nは自然数または∞)。n一様ならば(n-1)一様であり、∞一様は無条件となり、0一様はsmashing、1一様はコホモロジー閉を意味する。また、素イデアルスペクトラムの部分集合のうち「n連結」(n-coherent)と呼ぶものを定義した。n一様性と同様にn連結ならば(n-1)連結、∞連結は無条件であり、0連結は特殊化閉、1連結はKrauseの意味での連結を意味する。そして、n一様局所化部分圏とn連結部分集合の間にFoxbyの意味での小台(small support)を用いて一対一対応を構成することができた。これは前述のNeemanの定理の他、いくつかの既存の分類定理を包括するものである。これら一連の結果は論文にまとめて海外の査読付き学術誌に現在投稿中である。

  • Research Products

    (42 results)

All 2020 2019

All Journal Article (27 results) (of which Int'l Joint Research: 18 results,  Peer Reviewed: 27 results,  Open Access: 1 results) Presentation (15 results) (of which Int'l Joint Research: 7 results,  Invited: 13 results)

  • [Journal Article] On the radius of the category of extensions of matrix factorizations2020

    • Author(s)
      Kaori Shimada; Ryo Takahashi
    • Journal Title

      Journal of Algebra

      Volume: 546 Pages: 566--579

    • DOI

      10.1016/j.jalgebra.2019.10.054

    • Peer Reviewed
  • [Journal Article] Maximal Cohen-Macaulay modules that are not locally free on the punctured spectrum2020

    • Author(s)
      Toshinori Kobayashi; Justin Lyle; Ryo Takahashi
    • Journal Title

      Journal of Pure and Applied Algebra

      Volume: 224 Pages: 106311, 29pp

    • DOI

      10.1016/j.jpaa.2020.106311

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Local rings with quasi-decomposable maximal ideal2020

    • Author(s)
      Saeed Nasseh; Ryo Takahashi
    • Journal Title

      Mathematical Proceedings of the Cambridge Philosophical Society

      Volume: 168 Pages: 305--322

    • DOI

      10.1017/S0305004118000695

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A topology on the set of isomorphism classes of maximal Cohen-Macaulay modules2020

    • Author(s)
      Naoya Hiramatsu; Ryo Takahashi
    • Journal Title

      Proceedings of the American Mathematical Society

      Volume: 148 Pages: 2359--2369

    • DOI

      10.1090/proc/14965

    • Peer Reviewed
  • [Journal Article] Homogeneous prime elements in normal two-dimensional graded rings2020

    • Author(s)
      Anurag Singh; Ryo Takahashi; Kei-ichi Watanabe
    • Journal Title

      Journal of Algebra

      Volume: 0 Pages: 0

    • DOI

      10.1016/j.jalgebra.2018.07.012

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The Jacobian ideal of a commutative ring and annihilators of cohomology2020

    • Author(s)
      Srikanth B. Iyengar; Ryo Takahashi
    • Journal Title

      Journal of Algebra

      Volume: 0 Pages: 0

    • DOI

      10.1016/j.jalgebra.2018.07.034

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Little dimension and the improved new intersection theorem2020

    • Author(s)
      Tsutomu Nakamura; Ryo Takahashi; Siamak Yassemi
    • Journal Title

      Mathematica Scandinavica

      Volume: - Pages: -

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Powers of the maximal ideal and vanishing of (co)homology2020

    • Author(s)
      Olgur Celikbas; Ryo Takahashi
    • Journal Title

      Glasgow Mathematical Journal

      Volume: - Pages: -

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Resolving subcategories closed under certain operations and a conjecture of Dao and Takahashi2020

    • Author(s)
      Arash Sadeghi; Ryo Takahashi
    • Journal Title

      Michigan Mathematical Journal

      Volume: - Pages: -

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Construction of spectra of triangulated categories and applications to commutative rings2020

    • Author(s)
      Hiroki Matsui; Ryo Takahashi
    • Journal Title

      Journal of Mathematical Society of Japan

      Volume: - Pages: -

    • Peer Reviewed
  • [Journal Article] Gorenstein modifications and Q-Gorenstein rings2020

    • Author(s)
      Hailong Dao; Osamu Iyama; Ryo Takahashi; Michael Wemyss
    • Journal Title

      Journal of Algebraic Geometry

      Volume: - Pages: -

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Burch ideals and Burch rings2020

    • Author(s)
      Hailong Dao; Toshinori Kobayashi; Ryo Takahashi
    • Journal Title

      Algebra and Number Theory

      Volume: - Pages: -

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Cohomological dimensions of specialization-closed subsets and subcategories of modules2020

    • Author(s)
      Hiroki Matsui; Tran Tuan Nam; Ryo Takahashi; Nguyen Minh Tri; Do Ngoc Yen
    • Journal Title

      Proceedings of the American Mathematical Society

      Volume: - Pages: -

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Applications and homological properties of local rings with decomposable maximal ideals2019

    • Author(s)
      Saeed Nasseh; Sean Sather-Wagstaff; Ryo Takahashi; Keller VandeBogert
    • Journal Title

      Journal of Pure and Applied Algebra

      Volume: 223 Pages: 1272--1287

    • DOI

      10.1016/j.jpaa.2018.06.006

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Totally reflexive modules and Poincar? series2019

    • Author(s)
      Mohsen Gheibi; Ryo Takahashi
    • Journal Title

      Journal of Algebra

      Volume: 520 Pages: 440--459

    • DOI

      10.1016/j.jalgebra.2018.10.040

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Remarks on dimensions of triangulated categories2019

    • Author(s)
      Takuma Aihara; Ryo Takahashi
    • Journal Title

      Journal of Algebra

      Volume: 521 Pages: 235--246

    • DOI

      10.1016/j.jalgebra.2018.12.001

    • Peer Reviewed
  • [Journal Article] Degenerations over (A_\infty)-singularities and construction of degenerations over commutative rings2019

    • Author(s)
      Naoya Hiramatsu; Ryo Takahashi; Yuji Yoshino
    • Journal Title

      Journal of Algebra

      Volume: 525 Pages: 374--389

    • DOI

      10.1016/j.jalgebra.2018.12.031

    • Peer Reviewed
  • [Journal Article] Noncommutative resolutions using syzygies2019

    • Author(s)
      Hailong Dao; Osamu Iyama; Srianth B. Iyengar; Ryo Takahashi; Michael Wemyss; Yuji Yoshino
    • Journal Title

      Bulletin of the London Mathematical Society

      Volume: 51 Pages: 43--48

    • DOI

      10.1112/blms.12210

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Openness of the regular locus and generators for module categories2019

    • Author(s)
      Srikanth B. Iyengar; Ryo Takahashi
    • Journal Title

      Acta Mathematica Vietnamica

      Volume: 44 Pages: 207--212

    • DOI

      10.1007/s40306-018-0294-8

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] On the transitivity of degeneration of modules2019

    • Author(s)
      Ryo Takahashi
    • Journal Title

      Manuscripta Mathematica

      Volume: 159 Pages: 431--444

    • DOI

      10.1007/s00229-018-1076-2

    • Peer Reviewed
  • [Journal Article] On the second rigidity theorem of Huneke and Wiegand2019

    • Author(s)
      Olgur Celikbas; Ryo Takahashi
    • Journal Title

      Proceedings of the American Mathematical Society

      Volume: 147 Pages: 2733--2739

    • DOI

      10.1090/proc/14564

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] On the ideal case of a conjecture of Huneke and Wiegand2019

    • Author(s)
      Olgur Celikbas; Shiro Goto; Ryo Takahashi; Naoki Taniguchi
    • Journal Title

      Proceedings of the Edinburgh Mathematical Society (2)

      Volume: 62 Pages: 847--859

    • DOI

      10.1017/S0013091518000731

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Ulrich modules over Cohen-Macaulay local rings with minimal multiplicity2019

    • Author(s)
      Toshinori Kobayashi; Ryo Takahashi
    • Journal Title

      The Quarterly Journal of Mathematics

      Volume: 70 Pages: 487--507

    • DOI

      10.1093/qmath/hay055

    • Peer Reviewed
  • [Journal Article] Two generalizations of Auslander-Reiten duality and applications2019

    • Author(s)
      Arash Sadeghi; Ryo Takahashi
    • Journal Title

      Illinois Journal of Mathematics

      Volume: 63 Pages: 335--351

    • DOI

      10.1215/00192082-7768744

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Associated primes and syzygies of linked modules2019

    • Author(s)
      Olgur Celikbas; Mohammad T. Dibaei; Mohsen Gheibi; Arash Sadeghi; Ryo Takahashi
    • Journal Title

      Journal of Commutative Algebra

      Volume: 11 Pages: 301--323

    • DOI

      10.1216/JCA-2019-11-3-301

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Rings whose ideals are isomorphic to trace ideals2019

    • Author(s)
      Toshinori Kobayashi; Ryo Takahashi
    • Journal Title

      Mathematische Nachrichten

      Volume: 292 Pages: 2252--2261

    • DOI

      10.1002/mana.201800309

    • Peer Reviewed
  • [Journal Article] Generation in singularity categories of hypersurfaces of countable representation type2019

    • Author(s)
      Tokuji Araya; Kei-ichiro Iima; Maiko Ono; Ryo Takahashi
    • Journal Title

      Archiv der Mathematik (Basel)

      Volume: 113 Pages: 603--615

    • DOI

      10.1007/s00013-019-01374-x

    • Peer Reviewed
  • [Presentation] 因子類群の中のMCM点について2020

    • Author(s)
      高橋 亮
    • Organizer
      霧島可換環論セミナー, 国分パークプラザ
    • Invited
  • [Presentation] 階数1の極大Cohen-Macaulay加群の個数の有限性について2020

    • Author(s)
      高橋 亮
    • Organizer
      第21回岡山可換代数表現セミナー (OSCAR)&吉野雄二先生退職記念集会, 岡山大学
    • Invited
  • [Presentation] Zariski spectra of commutative rings and Balmer spectra of tensor triangulated categories2019

    • Author(s)
      Ryo Takahashi
    • Organizer
      Unversita di Verona, Verona, Italy
    • Int'l Joint Research / Invited
  • [Presentation] 可換環の表現論への誘い2019

    • Author(s)
      高橋 亮
    • Organizer
      数理科学特別講義C,G, 大阪府立大学
    • Invited
  • [Presentation] Generalizations of Ulrich modules and rigidity theorems2019

    • Author(s)
      Olgur Celikbas; Justin Lyle; Ryo Takahashi; Yongwei Yao
    • Organizer
      AMS Fall Central Sectional Meeting, Special Session on Homological and Characteristic p>0 Methods in Commutative Algebra, University of Wisconsin-Madison, Madison, WI, USA
    • Int'l Joint Research / Invited
  • [Presentation] Quasi-projective dimension2019

    • Author(s)
      Mohsen Gheibi; David A. Jorgensen; Ryo Takahashi
    • Organizer
      AMS Fall Southeastern Sectional Meeting, Special Session on Homological Methods in Algebra, University of Florida, Gainesville, FL, USA
    • Int'l Joint Research / Invited
  • [Presentation] On the second rigidity theorem of Huneke and Wiegand2019

    • Author(s)
      Olgur Celikbas; Ryo Takahashi
    • Organizer
      AMS Fall Southeastern Sectional Meeting, Special Session on Homological Methods in Algebra, University of Florida, Gainesville, FL, USA
    • Int'l Joint Research / Invited
  • [Presentation] Local cohomology and coherent subsets2019

    • Author(s)
      Ryo Takahashi
    • Organizer
      Weakly Seminar on Commutative Algebra, VIASM, Hanoi, Vietnam
    • Int'l Joint Research / Invited
  • [Presentation] A spectrum of a triangulated category that is not necessarily tensor-triangulated2019

    • Author(s)
      Ryo Takahashi
    • Organizer
      MALGA, University of Verona
    • Int'l Joint Research / Invited
  • [Presentation] Cohen-Macaulay rings of finite CM+ representation type2019

    • Author(s)
      Ryo Takahashi
    • Organizer
      Algebra Seminar, University of Texas at Arlington, Arlington, TX, USA
    • Int'l Joint Research / Invited
  • [Presentation] 階数1の極大Cohen-Macaulay加群の張る錐について2019

    • Author(s)
      高橋 亮
    • Organizer
      東京可換環論セミナー, 東京大学
    • Invited
  • [Presentation] Cones spanned by maximal Cohen-Macaulay modules of rank one2019

    • Author(s)
      Ryo Takahashi
    • Organizer
      名古屋大学環論表現論セミナー, 名古屋大学
    • Invited
  • [Presentation] Resolving subcategories and totally reflexive modules (分解部分圏と全反射加群)2019

    • Author(s)
      高橋 亮
    • Organizer
      第25回静岡代数学セミナー&星野光男氏追悼研究集会, 静岡大学
    • Invited
  • [Presentation] 有限CM+表現型のCohen-Macaulay局所環2019

    • Author(s)
      高橋 亮
    • Organizer
      第32回可換環論セミナー, 弘前大学
  • [Presentation] Modules of finite projective quasi-dimension2019

    • Author(s)
      高橋 亮
    • Organizer
      第41回可換環論シンポジウム, 倉敷シーサイドホテル

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Published: 2021-01-27  

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