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Algebro-Geometric Approach to Invariants in Commutative Algebra

Research Project

Project/Area Number 18540007
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Algebra
Research InstitutionTohoku University

Principal Investigator

HARA Nobuo  Tohoku University, 大学院・理学研究科, 准教授 (90298167)

Co-Investigator(Kenkyū-buntansha) 石田 正典  東北大学, 大学院・理学研究科, 教授 (30124548)
尾形 庄悦  東北大学, 大学院・理学研究科, 准教授 (90177113)
梶原 健  横浜国立大学, 大学院・工学研究院, 准教授 (00250663)
吉田 健一  名古屋大学, 大学院・多元数理科学研究科, 准教授 (80240802)
Co-Investigator(Renkei-kenkyūsha) ISHIDA Masanori  東北大学, 大学院・理学研究科, 教授 (30124548)
OGATA Shoetsu  東北大学, 大学院・理学研究科, 准教授 (90177113)
KAJIWARA Takeshi  横浜国立大学, 大学院・工学研究院, 准教授 (00250663)
Project Period (FY) 2006 – 2008
Project Status Completed (Fiscal Year 2008)
Budget Amount *help
¥3,930,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥630,000)
Fiscal Year 2008: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2007: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2006: ¥1,200,000 (Direct Cost: ¥1,200,000)
Keywords代数幾何 / 可換環論 / 特異点 / 正標数 / フロベニウス写像 / F-特異点 / F-純閾値 / F-跳躍数 / F-正則性 / フロベニウス射 / ベクトル束 / 代数多様体 / Q-Gorenstein性 / F-爆発 / Hilbert-Kunz重複度 / 擬斉次 / 半安定性 / 組の特異点 / 対数的標準閾特異点 / F-純特異点の最小中心 / 代数曲面 / 随伴束 / F-分裂次元
Research Abstract

正標数の可換環論における不変量や特異点の性質, とくに, F-純閾値, F-跳躍数や強F-正則性などについて, 代数幾何的な手法を用いて研究し, 2次元正則局所環の場合のF-純閾値, F-跳躍数の振る舞いを明らかにした. また, 強F-正則性と対数的端末特異点の対応を従来の仮定(Q-Gorenstein性)より弱い仮定(混標数モデルにおける反標準環の有限生成性)の下で証明した.

Report

(4 results)
  • 2008 Annual Research Report   Final Research Report ( PDF )
  • 2007 Annual Research Report
  • 2006 Annual Research Report
  • Research Products

    (14 results)

All 2008 2007 2006

All Journal Article (6 results) (of which Peer Reviewed: 1 results) Presentation (8 results)

  • [Journal Article] F-pure thresholds and F-jumping exponents in dimension two, with an appendix by Paul Monsky2006

    • Author(s)
      N. Hara
    • Journal Title

      Mathematical Research Letters 13

      Pages: 747-760

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] F-pure thresholds and F-jumping exponents in dimension two2006

    • Author(s)
      N.Hara (Appendix by P.Monsky)
    • Journal Title

      Mathematical Research Letters 13

      Pages: 747-760

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Completion of real fans and Zariski-Riemann spaces2006

    • Author(s)
      G.Ewald, M.Ishida
    • Journal Title

      Tohoku Mathematical Journal 58

      Pages: 189-218

    • NAID

      110004669750

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Abelian surfaces in projective 4-folds2006

    • Author(s)
      T.Kajiwara
    • Journal Title

      Archiv der Mathematik 86

      Pages: 43-49

    • Related Report
      2006 Annual Research Report
  • [Journal Article] On higher syzygies of weighted projective spaces2006

    • Author(s)
      S.Ogata
    • Journal Title

      Mathematical Journal of Okayama University 48

      Pages: 47-55

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Multiplication maps of complete linear systems on projective toric surfaces2006

    • Author(s)
      S.Ogata
    • Journal Title

      Interdisciplinary Information Sciences 12

      Pages: 93-107

    • Related Report
      2006 Annual Research Report
  • [Presentation] F-特異点とその応用2008

    • Author(s)
      原伸生
    • Organizer
      玉原代数幾何セミナー2008
    • Place of Presentation
      東京大学玉原国際セミナーハウス
    • Year and Date
      2008-08-11
    • Related Report
      2008 Final Research Report
  • [Presentation] Strong F-regularity vs.log ter-minal singularity in non-Q-Gorenstein case2008

    • Author(s)
      N. Hara
    • Organizer
      Commutative Algebra and its Interactions, A conference in honor of Mel Hochster
    • Place of Presentation
      University of Michigan, USA
    • Year and Date
      2008-08-04
    • Related Report
      2008 Final Research Report
  • [Presentation] Strong F-regularity vs. log terminal singularity in non-Q-Gorenstein case2008

    • Author(s)
      Nobuo Hara
    • Organizer
      Commutative Algebra and Its Interactions A conference in honor of Mel Hochster
    • Place of Presentation
      University of Michigan(アメリカ)
    • Year and Date
      2008-08-04
    • Related Report
      2008 Annual Research Report
  • [Presentation] Bound for Frobenius destabilized semistable bundles and Harder-Narasi-mhan filtrations in characteristic p(after Langer, Shepherd-Barron et.al.)2007

    • Author(s)
      原伸生
    • Organizer
      代数幾何学都留ワークショップ
    • Place of Presentation
      都留文科大学
    • Year and Date
      2007-09-27
    • Related Report
      2008 Final Research Report
  • [Presentation] Bound for Frobenius destabilized semistable bundles and Harder-Narasimhan filtrations in characteristic p2007

    • Author(s)
      原 伸生
    • Organizer
      代数幾何学 都留ワークショップ
    • Place of Presentation
      都留文科大学
    • Year and Date
      2007-09-27
    • Related Report
      2007 Annual Research Report
  • [Presentation] Multiplier idealの標数0の手法と標数$p$の手法及びその応用II2006

    • Author(s)
      原伸生
    • Organizer
      短期共同研究集会"Arc Spaces and Multiplier Ideals"
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2006-08-29
    • Related Report
      2008 Final Research Report
  • [Presentation] Multiplier idealの標数0の手法と標数$p$の手法及びその応用I2006

    • Author(s)
      原伸生
    • Organizer
      短期共同研究集会"Arc Spaces and Multiplier Ideals"
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2006-08-28
    • Related Report
      2008 Final Research Report
  • [Presentation] Characteristic p method : F-sin- gularities, ARCC Workshop "Numerical Invariants of Singularities and Higher-Dimensional Algebraic Varieties,"2006

    • Author(s)
      N. Hara
    • Organizer
      Ameri-can Institute of Mathematics
    • Place of Presentation
      Palo Alto, USA
    • Year and Date
      2006-08-01
    • Related Report
      2008 Final Research Report

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Published: 2006-04-01   Modified: 2016-04-21  

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