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2019 Fiscal Year Annual Research Report

整環の表現論の総合的研究

Research Project

Project/Area Number 16H03923
Research InstitutionNagoya University

Principal Investigator

伊山 修  名古屋大学, 多元数理科学研究科, 教授 (70347532)

Co-Investigator(Kenkyū-buntansha) 高橋 亮  名古屋大学, 多元数理科学研究科, 准教授 (40447719)
毛利 出  静岡大学, 理学部, 教授 (50436903)
Project Period (FY) 2016-04-01 – 2021-03-31
Keywords傾理論・団傾理論 / 三角圏・導来圏 / 団圏 / d単純系 / modifying加群 / cDV特異点 / 前射影多元環 / 傾ベクトル束
Outline of Annual Research Achievements

自然数dに対し[-d]をSerre関手に持つ三角圏を(-d)-Calabi-Yauと呼ぶが, 団圏や特別なDG代数の特異圏などの例が知られている. 環上の単純加群全体の持つ性質を(-d)-Calabi-Yau三角圏で公理化した概念がd単純系(d-simple-minded system)である. Jinとの共同研究で, Dynkin箙の(-d)団圏におけるd単純系の個数が, 組み合わせ論で重要な正Fuss-Catalan数で与えられることを示した.

2次元の単純特異点(Du Val特異点)が有限表現型(直既約反射的加群の同型類が有限個)であることは古典的事実だが, この3次元類似をcDV特異点に対してWemyssとの共同研究で与えた. 自己準同型環がCohen-Macaulayとなるような反射的加群をmodifyingと呼ぶが, 近年, 傾理論との関連から多くの研究がなされている. cDV特異点のmodifying加群の同型類の集合から, 拡大Dynkin型の部分Tits cone内の格子点への単射を構成し, 孤立特異点ならば全単射となることを示した. 構成には拡大Dynkin型前射影多元環の傾理論が本質的に用いられる. これに関しては次年度も引き続き研究を行う.

Buchweitz, Hilleとの共同研究で, 射影代数多様体上のベクトル束の圏の団傾部分圏(cluster tilting subcategory)を研究した. 例えば射影空間P^dの場合, 直線束の直和の全体がd団傾部分圏をなすが, この事実はHorrocksによる分裂判定法と等価である. より一般にd次元Fano多様体が, 傾ベクトル束Tで自己準同型環の大域次元がdとなるものを持てば, ベクトル束の圏のd団傾部分圏をTから構成できる. 証明にはd無限表現型多元環の理論が用いられる. これに関しては次年度も引き続き研究を行う.

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

団圏のd単純系に関する論文が完成し, cDV特異点のmodifying加群と射影多様体の団傾理論の論文作成が大幅に前進した.

Strategy for Future Research Activity

引き続き, Auslander-Reiten理論, 傾理論, 団傾理論, 非可換特異点解消などに関する諸問題に関して, じっくりと取り組む予定である.

  • Research Products

    (63 results)

All 2020 2019 Other

All Int'l Joint Research (6 results) Journal Article (23 results) (of which Int'l Joint Research: 15 results,  Peer Reviewed: 22 results,  Open Access: 2 results) Presentation (29 results) (of which Int'l Joint Research: 16 results,  Invited: 21 results) Remarks (1 results) Funded Workshop (4 results)

  • [Int'l Joint Research] University of Glasgow/University of East Anglia(英国)

    • Country Name
      UNITED KINGDOM
    • Counterpart Institution
      University of Glasgow/University of East Anglia
  • [Int'l Joint Research] The University of Kansas(米国)

    • Country Name
      U.S.A.
    • Counterpart Institution
      The University of Kansas
  • [Int'l Joint Research] Nanjing University/Nanjing University of Inf. Sci. & Tech.(中国)

    • Country Name
      CHINA
    • Counterpart Institution
      Nanjing University/Nanjing University of Inf. Sci. & Tech.
  • [Int'l Joint Research] Uppsala University(スウェーデン)

    • Country Name
      SWEDEN
    • Counterpart Institution
      Uppsala University
  • [Int'l Joint Research] University of Toronto(カナダ)

    • Country Name
      CANADA
    • Counterpart Institution
      University of Toronto
  • [Int'l Joint Research]

    • # of Other Countries
      2
  • [Journal Article] Tilting theory for Gorenstein rings in dimension one2020

    • Author(s)
      Ragnar-Olaf Buchweitz, Osamu Iyama, Kota Yamaura
    • Journal Title

      Forum Math. Sigma

      Volume: 8 Pages: e36

    • DOI

      10.1017/fms.2020.28

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Classifying $\tau$-tilting modules over the Auslander algebra of $K[x]/(x^n)$2020

    • Author(s)
      Osamu Iyama, Xiaojin Zhang
    • Journal Title

      J. Math. Soc. Japan

      Volume: 72 Pages: 731--764

    • DOI

      10.2969/jmsj/75117511

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Gorenstein modifications and Q-Gorenstein rings2020

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

      J. Algebraic Geom.

      Volume: 29 Pages: 729--751

    • DOI

      10.1090/jag/760

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Higher preprojective algebras, Koszul algebras and superpotentials2020

    • Author(s)
      Joseph Grant, Osamu Iyama
    • Journal Title

      Compos. Math.

      Volume: 156 Pages: 2588--2627

    • DOI

      10.1112/S0010437X20007538

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] d-representation-finite self-injective algebras2020

    • Author(s)
      Erik Darpoe, Osamu Iyama
    • Journal Title

      Adv. Math.

      Volume: 362 Pages: 106932

    • DOI

      10.1016/j.aim.2019.106932

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Representation theory of Geigle-Lenzing complete intersections2020

    • Author(s)
      Martin Herschend, Osamu Iyama, Hiroyuki Minamoto, Steffen Oppermann
    • Journal Title

      Mem. Amer. Math. Soc.

      Volume: 印刷中 Pages: -

    • DOI

      -

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Quotients of triangulated categories and Equivalences of Buchweitz, Orlov and Amiot--Guo―Keller2020

    • Author(s)
      Osamu Iyama, Dong Yang
    • Journal Title

      Amer. J. Math.

      Volume: 印刷中 Pages: -

    • DOI

      -

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A categorical characterization of quantum projective spaces2020

    • Author(s)
      Izuru Mori, Kenta Ueyama
    • Journal Title

      J. Noncommut. Geom.

      Volume: 印刷中 Pages: -

    • DOI

      -

    • Peer Reviewed
  • [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] Tilting Cohen-Macaulay representations2019

    • Author(s)
      Osamu Iyama
    • Journal Title

      Proceedings of the International Congress of Mathematicians--Rio de Janeiro 2018. Vol. II. Invited lectures

      Volume: - Pages: 125--162

    • DOI

      10.1142/9789813272880_0048

  • [Journal Article] Weighted Projective Lines and Rational Surface Singularities2019

    • Author(s)
      Osamu Iyama, Michael Wemyss
    • Journal Title

      Epijournal Geom. Algebrique

      Volume: 3 Pages: -

    • 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] 自由性と単純性:Konig-Yang 対応を通して2020

    • Author(s)
      Osamu Iyama
    • Organizer
      第3回数理新人セミナー, 名古屋大学
    • Invited
  • [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] Cluster tilting in projective geometry2019

    • Author(s)
      Osamu Iyama
    • Organizer
      Ragnar's Ramification in Algebra and Geometry Emerging Workshop, Fields Institute, Toronto, Canada
    • Int'l Joint Research / Invited
  • [Presentation] Tilting theory of preprojective algebras and Cohen-Macaulay modules (3 lectures)2019

    • Author(s)
      Osamu Iyama
    • Organizer
      Two weeks of silting, University of Stuttgart, Germany
    • Int'l Joint Research / Invited
  • [Presentation] Tilting theory of contracted preprojective algebras2019

    • Author(s)
      Osamu Iyama
    • Organizer
      Workshop on quiver varieties and representation theory, CRM, Montreal, Canada
    • Int'l Joint Research / Invited
  • [Presentation] Radical layers of representable functors, revisited2019

    • Author(s)
      Osamu Iyama
    • Organizer
      Homological methods and Tilting theory of Finite Dimensional algebras, University of Iowa, U.S.A.
    • Int'l Joint Research / Invited
  • [Presentation] Radical layers of representable functors, revisited2019

    • Author(s)
      Osamu Iyama
    • Organizer
      Seminario de Representaciones de Algebras, UNAM, Mexico city, Mexico
    • Int'l Joint Research / Invited
  • [Presentation] Cohen-Macaulay DG modules and Calabi-Yau configuration, after H. Jin2019

    • Author(s)
      Osamu Iyama
    • Organizer
      Algebraic Representation Theory and Related Topics, Tsinghua Sanya International Mathematics Forum, China
    • Int'l Joint Research
  • [Presentation] Tilting theory of contracted preprojective algebras and cDV singularities2019

    • Author(s)
      Osamu Iyama
    • Organizer
      2019 Noncommutative Algebraic Geometry Shanghai Workshop, Shanghai Center for Mathematical Sciences, Shanghai, China
    • Int'l Joint Research / Invited
  • [Presentation] Tilting theory for Gorenstein rings in dimension one2019

    • Author(s)
      Osamu Iyama
    • Organizer
      Algebra Seminar, Shanghai Jiao Tong University, Shanghai, China
    • Int'l Joint Research / Invited
  • [Presentation] Tilting theory of contracted preprojective algebras and cDV singularities2019

    • Author(s)
      Osamu Iyama
    • Organizer
      第41回可換環論シンポジウム, 倉敷シーサイドホテル
  • [Presentation] Tilting modules and torsion theories revisited2019

    • Author(s)
      Osamu Iyama
    • Organizer
      第25回静岡代数学セミナーおよび星野光男氏の追悼研究集会, 静岡大学,
  • [Presentation] Noncommutative Matrix Factorizations and Knorrer’s Periodicity Theorem2019

    • Author(s)
      Izuru Mori
    • Organizer
      第24回静岡代数学セミナー, 静岡大学
  • [Presentation] Noncommutative Matrix Factorizations and Knorrer's Periodicity Theorem2019

    • Author(s)
      Izuru Mori
    • Organizer
      第8回日中韓環論国際シンポジウム, 名古屋大学
    • Int'l Joint Research
  • [Presentation] Noncommutative Graded Knorrer's Periodicity Theorem2019

    • Author(s)
      Izuru Mori, Kenta Ueyama
    • Organizer
      日本数学会2019年度秋季総合分科会, 金沢大学
  • [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
  • [Remarks] Osamu Iyama's Home Page

    • URL

      https://www.math.nagoya-u.ac.jp/~iyama/

  • [Funded Workshop] Cluster Algebras, RIMS2019

  • [Funded Workshop] The 8th China-Japan-Korea International Symposium on Ring Theory, Nagoya University2019

  • [Funded Workshop] Summer School on DG theory and Derived Categories, Nagoya University2019

  • [Funded Workshop] Algebraic Representation Theory and Related Topics, Tsinghua Sanya International Mathematics Forum2019

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Published: 2021-01-27  

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