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2015 Fiscal Year Annual Research Report

可換環の加群圏・導来圏・特異圏の構造解析

Research Project

Project/Area Number 25400038
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) 2013-04-01 – 2016-03-31
Keywords孤立特異点 / 導来圏 / thick部分圏 / Cohen-Macaulay環 / Cohen-Macaulay加群 / Gorenstein環
Outline of Annual Research Achievements

平成27年度は以下の研究を行った。
(1) Cohen-Macaulay局所環のUlrichイデアルに付随するあるRHom複体の構造を決定し、Ulrichイデアルに関するさまざまな性質を得た。特に、1次元の概Gorensteinかつ非Gorensteinな局所環のUlrichイデアルは極大イデアル以外に存在しないことがわかった。
(2) 孤立特異点上の有限生成加群の有界導来圏のthick部分圏のうち剰余体を含むものを完全に分類し、極小重複度をもつCohen-Macaulay局所環の場合に標準thick部分圏を完全に決定した。また、同様の問題を加群圏に対しても考察し、基礎環が2次元以下の場合に剰余体を含むthick部分圏が必ずSerre部分圏になることを証明した。
(3) Cohen-Macaulay局所環上の有限生成加群が自由加群になるための必要十分条件を、あるExt加群の消滅によって与えた。この結果は、Cohen-Macaulay正規局所環上の階数1の極大Cohen-Macaulay加群に関してAuslander-Reiten予想が成り立つことを導き、太刀川予想に関するAvramov-Buchweitz-SegaとHanes-Hunekeの定理を回復する。
(4) 剰余体のシジジーに水平的にリンクする加群の直和因子の構造を調べ、各種のホモロジカル次元および深度の評価を得た。これにより、Gorenstein環の特徴付けに関するHolmの定理が回復された。

  • Research Products

    (27 results)

All 2017 2016 2015 Other

All Int'l Joint Research (3 results) Journal Article (12 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 12 results,  Acknowledgement Compliant: 10 results) Presentation (11 results) (of which Int'l Joint Research: 11 results,  Invited: 11 results) Remarks (1 results)

  • [Int'l Joint Research] カンザス大学/ユタ大学/テキサス工科大学(米国)

    • Country Name
      U.S.A.
    • Counterpart Institution
      カンザス大学/ユタ大学/テキサス工科大学
    • # of Other Institutions
      3
  • [Int'l Joint Research] ケンブリッジ大学(英国)

    • Country Name
      UNITED KINGDOM
    • Counterpart Institution
      ケンブリッジ大学
  • [Int'l Joint Research] 基礎科学研究所(IPM)(イラン)

    • Country Name
      IRAN
    • Counterpart Institution
      基礎科学研究所(IPM)
  • [Journal Article] Annihilation of cohomology and strong generation of module categories2016

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

      Int. Math. Res. Not. IMRN

      Volume: 2016 Pages: 499-535

    • DOI

      10.1093/imrn/rnv136

    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Ulrich ideals and modules of two-dimensional rational singularities2016

    • Author(s)
      Shiro Goto; Kazuho Ozeki; Ryo Takahashi; Kei-ichi Watanabe; Ken-ichi Yoshida
    • Journal Title

      Nagoya Math. J.

      Volume: 221 Pages: 69-110

    • DOI

      10.1017/nmj.2015.1

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Ulrich ideals and almost Gorenstein rings2016

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

      Proc. Amer. Math. Soc.

      Volume: TBD Pages: TBD

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Extension closedness of syzygies and local Gorensteinness of commutative rings2016

    • Author(s)
      Shiro Goto; Ryo Takahashi
    • Journal Title

      Algebr. Represent. Theory

      Volume: TBD Pages: TBD

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Perfect linkage of Cohen-Macaulay modules over Cohen-Macaulay rings2016

    • Author(s)
      Kei-ichiro Iima; Ryo Takahashi
    • Journal Title

      J. Algebra

      Volume: TBD Pages: TBD

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Upper bounds for dimensions of singularity categories2015

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

      C. R. Math. Acad. Sci. Paris

      Volume: 353 Pages: 297-301

    • DOI

      10.1016/j.crma.2015.01.012

    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Building modules from the singular locus2015

    • Author(s)
      Jesse Burke; Lars Winther Christensen; Ryo Takahashi
    • Journal Title

      Math. Scand.

      Volume: 116 Pages: 23-33

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Maximal Cohen-Macaulay approximations and Serre's condition2015

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

      Acta Math. Vietnam.

      Volume: 40 Pages: 197-203

    • DOI

      10.1007/s40306-014-0105-9

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Non-commutative resolutions and Grothendieck groups2015

    • Author(s)
      Hailong Dao; Osamu Iyama; Ryo Takahashi; Charles Vial
    • Journal Title

      J. Noncommut. Geom.

      Volume: 9 Pages: 21-34

    • DOI

      10.4171/JNCG/186

    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Endofunctors of singularity categories characterizing Gorenstein rings2015

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

      Proc. Amer. Math. Soc.

      Volume: 143 Pages: 3777-3779

    • DOI

      10.1090/proc/12580

    • Peer Reviewed
  • [Journal Article] Generators and dimensions of derived categories of modules2015

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

      Comm. Algebra

      Volume: 43 Pages: 5003-5029

    • DOI

      10.1080/00927872.2014.957384

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] The dimension of a subcategory of modules2015

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

      Forum Math. Sigma

      Volume: 3 Pages: 31 pp

    • DOI

      10.1017/fms.2015.19

    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Presentation] TBD2017

    • Author(s)
      Ryo Takahashi
    • Organizer
      The Prospects for Commutative Algebra
    • Place of Presentation
      Hotel Nikko Osaka
    • Year and Date
      2017-07-10 – 2017-07-14
    • Int'l Joint Research / Invited
  • [Presentation] TBD2017

    • Author(s)
      Ryo Takahashi
    • Organizer
      MSRI Summer Graduate School
    • Place of Presentation
      Okinawa Institute of Science and Technology Graduate University (OIST)
    • Year and Date
      2017-05-22 – 2017-06-02
    • Int'l Joint Research / Invited
  • [Presentation] TBD2016

    • Author(s)
      Ryo Takahashi
    • Organizer
      17th Workshop and International Conference on Representations of Algebras (ICRA)
    • Place of Presentation
      Syracuse University, Syracuse NY, USA
    • Year and Date
      2016-08-10 – 2016-08-13
    • Int'l Joint Research / Invited
  • [Presentation] An introduction to Cohen-Macaulay representations2016

    • Author(s)
      Ryo Takahashi
    • Organizer
      Non-commutative crepant resolutions, Ulrich Modules and generalizations of the McKay correspondence
    • Place of Presentation
      RIMS, Kyoto University
    • Year and Date
      2016-06-13 – 2016-06-17
    • Int'l Joint Research / Invited
  • [Presentation] Dimensions of derived categories of commutative rings2016

    • Author(s)
      Ryo Takahashi
    • Organizer
      Triangulated Categories in Algebra, Geometry and Topology
    • Place of Presentation
      University of Stuttgart, University of Stuttgart, Stuttgart, Germany
    • Year and Date
      2016-03-17
    • Int'l Joint Research / Invited
  • [Presentation] Thick subcategories of derived categories of isolated singularities2016

    • Author(s)
      Ryo Takahashi
    • Organizer
      Workshop on Weighted Projective Spaces and Representation Theory
    • Place of Presentation
      University of Science and Technology of China, Hefei, China
    • Year and Date
      2016-03-08
    • Int'l Joint Research / Invited
  • [Presentation] Thick subcategories of modules containing the residue field2016

    • Author(s)
      Ryo Takahashi
    • Organizer
      December-January Seminar on Commutative Algebra in Ha Long Bay, Part II: Local algebra and Representation theory
    • Place of Presentation
      VIASM's villa, Ha Long, Quang Ninh (Tuan Chau Island), Vietnam
    • Year and Date
      2016-01-05
    • Int'l Joint Research / Invited
  • [Presentation] The cohomology annihilator of a Noetherian ring and its applications2016

    • Author(s)
      Ryo Takahashi
    • Organizer
      December-January Seminar on Commutative Algebra in Ha Long Bay, Part II: Local algebra and Representation theory
    • Place of Presentation
      VIASM's villa, Ha Long, Quang Ninh (Tuan Chau Island), Vietnam
    • Year and Date
      2016-01-05
    • Int'l Joint Research / Invited
  • [Presentation] Recent results in Cohen-Macaulay representation theory II2015

    • Author(s)
      Ryo Takahashi
    • Organizer
      Preprojective Algebras Interacting with Singularities, Cohen-Macaulay Modules and Weighted projective Spaces
    • Place of Presentation
      Banff International Research Station, Oaxaca, Mexico
    • Year and Date
      2015-10-09
    • Int'l Joint Research / Invited
  • [Presentation] Dimensions of derived categories of commutative rings2015

    • Author(s)
      Ryo Takahashi
    • Organizer
      DMM (Derived category, Mirror symmetry and McKay correspondence) seminar
    • Place of Presentation
      Kavli Institute for the Physics and Mathematics of the Universe (IPMU)
    • Year and Date
      2015-09-28
    • Int'l Joint Research / Invited
  • [Presentation] Almost Gorensteinness and G-regularity2015

    • Author(s)
      Ryo Takahashi
    • Organizer
      The Japan-Vietnam Seminar on Commutative Algebra -- by and for young mathematicians
    • Place of Presentation
      Meiji University
    • Year and Date
      2015-09-18
    • Int'l Joint Research / Invited
  • [Remarks] Ryo Takahashi

    • URL

      http://www.math.nagoya-u.ac.jp/~takahashi/

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Published: 2017-01-06   Modified: 2022-01-31  

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