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Singularities on algebraic varieties

Research Project

Project/Area Number 22340004
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Algebra
Research InstitutionThe University of Tokyo

Principal Investigator

ISHII Shihoko  東京大学, 数理(科)学研究科(研究院), 教授 (60202933)

Co-Investigator(Kenkyū-buntansha) WATANABE Keiichi  日本大学, 文理学部, 教授 (10087083)
TAKAGI Shunsuke  東京大学, 大学院数理科学研究科, 准教授 (40380670)
TOMARU Tadashi  群馬大学, 医学部, 教授 (70132579)
Project Period (FY) 2010-04-01 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2013: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2012: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2011: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2010: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Keywords特異点 / 弧空間 / 極小対数的食い違い数 / singularities / jet scheme / ジェットスキーム / 食い違い数 / discrepancy / Frobenius 射 / arc space / rational singularity / log-canonical singularity / multiplier ideal / graded ring
Outline of Final Research Achievements

We proved the Inversion of Adjunction formula according to the minimal log discrepancies which is defined by Mather-Jacobian discrepancies. By means of this discrepancies we introduced MJ-canonical singularities and also MJ-multiplier ideal. We also prove that the ideal has good properties; vanishing theorem, subaddidivity property and so on. In general MJ-minimal log discrepancy is greater than of equal to the dimension of the variety, we determined all MJ , we determined singularities whose MJ-minimal log discrepancy.

Report

(5 results)
  • 2014 Final Research Report ( PDF )
  • 2013 Annual Research Report
  • 2012 Annual Research Report
  • 2011 Annual Research Report
  • 2010 Annual Research Report
  • Research Products

    (58 results)

All 2015 2014 2013 2012 2011 2010 Other

All Journal Article (18 results) (of which Peer Reviewed: 18 results) Presentation (35 results) (of which Invited: 24 results) Book (5 results)

  • [Journal Article] Singularities with respect to Mather-Jacobian discrepancies2015

    • Author(s)
      Lawrence Ein, Shihoko Ishii
    • Journal Title

      MSRI Publications

      Volume: 68

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Multiplier ideals via Mather discrepancy2015

    • Author(s)
      Lawrence Ein, Shihoko Ishii, Mircea Mustata
    • Journal Title

      Publ. RIMS

      Volume: 70

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Introduction to Singularities2014

    • Author(s)
      Shihoko Ishii
    • Journal Title

      Springer-Verlag

      Volume: 1

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Multiplier ideals via Mather discrepancy2014

    • Author(s)
      L. Ein, M. Mustata, S. Ishii
    • Journal Title

      Publ. RIMS

      Volume: 未定

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Mather discrepancy and the arc spaces,2013

    • Author(s)
      Shihoko Ishii
    • Journal Title

      Ann. de L'Institut Fourier

      Volume: 63 Pages: 89-111

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Singularities with the highest Mather minimal log discrepancy2013

    • Author(s)
      S. Ishii, A. Reguera
    • Journal Title

      Math. Zeitschrift

      Volume: 275 Pages: 1255-1274

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Jet schemes of homogeneous hypersurfaces2012

    • Author(s)
      S.Ishii(with K-i. Watanabe, A.Sannai)
    • Journal Title

      Singularities in Geometry and Topology, Strasbourg 2009, IRMA Lectures in Mathematics and Theoretical Physics

      Volume: 20 Pages: 39-49

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A supplement to Fujino's paper: On isolated log canonical singularities with index one2012

    • Author(s)
      S.Ishii
    • Journal Title

      J. Math. Sci. Univ. Tokyo.

      Volume: 19 Pages: 135-138

    • NAID

      120005289895

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Genus of numerical semigroups generated by three elements,2012

    • Author(s)
      K.-i. Watanabe (with Hirokatsu Nari, Takahiro Numata).
    • Journal Title

      J. of Algebra

      Volume: 358 Pages: 67-73

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A variant of Wang's theorem2012

    • Author(s)
      K.-i. Watanabe (with K. Yoshida),
    • Journal Title

      J. of Algebra

      Volume: 369 Pages: 129-145

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Geometric properties on jet schemes2011

    • Author(s)
      S.Ishii
    • Journal Title

      Comm. Alg.

      Volume: 39, (5) Pages: 1872-1882

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Geometric properties on jet schemes2011

    • Author(s)
      S.Ishii
    • Journal Title

      Comm.Alg

      Volume: 39, Number5 Pages: 1872-1882

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Multiplicity bounds in graded ring2011

    • Author(s)
      C.Huneke, S.Takagi, K.Watanabe
    • Journal Title

      Kyoto J.math.

      Volume: 51 Pages: 127-147

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Supplements to non-lc ideal sheaves2011

    • Author(s)
      O.Fujino, K.Schwede, S.Takagi
    • Journal Title

      RIMS Kokyuroku Bessatsu

      Volume: B24 Pages: 1-46

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Coefficient ideal of ideals generated by monomials2011

    • Author(s)
      K.Watanabe, S.Ohnishi
    • Journal Title

      Comm.Alg

      Volume: 39 Pages: 1563-1576

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Isomorphisms of jet schemes2010

    • Author(s)
      S.Ishii, J.Winkelmann
    • Journal Title

      C.R.Math.Rep.Acad.Sci.Canada

      Volume: 32 Pages: 19-23

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Nash problem for a toric pair and the minimal log-discrepancy2010

    • Author(s)
      S.Ishii
    • Journal Title

      C.R.Math.Acad.Sci.Paris

      Volume: 348 Pages: 985-988

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Complex surface singularities and degenerations of compact complex curves2010

    • Author(s)
      T.Tomaru
    • Journal Title

      Demonstratio Mathematica

      Volume: 43(2) Pages: 39-59

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Presentation] Jet schemes and singularities in positive characteristic, 2015.3.172015

    • Author(s)
      Shihoko Ishii
    • Organizer
      野田代数幾何学シンポジウム
    • Place of Presentation
      東京理科大学
    • Year and Date
      2015-03-17
    • Related Report
      2013 Annual Research Report
    • Invited
  • [Presentation] Applications of arc space to singularities2015

    • Author(s)
      Shihoko Ishii
    • Organizer
      Workshop Artin Approximation and singularities.
    • Place of Presentation
      Luminy
    • Year and Date
      2015-02-22
    • Related Report
      2013 Annual Research Report
    • Invited
  • [Presentation] MJ-singularities in positive characteristic, Commutative Algebra and Singularity Theory, 2014.7.292014

    • Author(s)
      Shihoko Ishii
    • Organizer
      Commutative Algebra and Singularity Theory
    • Place of Presentation
      Tateyama
    • Year and Date
      2014-07-29
    • Related Report
      2013 Annual Research Report
    • Invited
  • [Presentation] Arc spaces now2011

    • Author(s)
      S.Ishii
    • Organizer
      研究集会「特異点とそのひろがり」
    • Place of Presentation
      京都大学
    • Year and Date
      2011-08-24
    • Related Report
      2010 Annual Research Report
  • [Presentation] On parameter F-jumping numbers2011

    • Author(s)
      S.Takagi
    • Organizer
      Special Session on Commutative Algebra, Joint AMS-MAA Mathematical Meetings
    • Place of Presentation
      New Orleans (USA)
    • Year and Date
      2011-01-07
    • Related Report
      2010 Annual Research Report
  • [Presentation] Applications of arc spaces to birational geometry I, II2011

    • Author(s)
      S.Ishii
    • Organizer
      Workshop Artin Approximation and Arcs
    • Place of Presentation
      Ervin Schlessinger Institut Vienna(オーストリア)
    • Related Report
      2010 Annual Research Report
  • [Presentation] A positive characteristic approach to Wang's theorem2010

    • Author(s)
      K.Watanabe, K.Yoshida
    • Organizer
      32nd Commutative Algebra Symposium, 6th Japan-Vietnam Joint Seminar on Commutative Algebra
    • Place of Presentation
      葉山
    • Year and Date
      2010-12-06
    • Related Report
      2010 Annual Research Report
  • [Presentation] A variant of Wang's Theorem in positive characteristic2010

    • Author(s)
      K.Watanabe
    • Organizer
      Commutative Algebra and its Interactions with Algebraic Geometry
    • Place of Presentation
      C.I.R.M, Luminy (France)
    • Year and Date
      2010-11-05
    • Related Report
      2010 Annual Research Report
  • [Presentation] Usual discrepancy versus Mather discrepancy2010

    • Author(s)
      S.Ishii
    • Organizer
      特異点と多様体の幾何学
    • Place of Presentation
      山形大学
    • Year and Date
      2010-09-17
    • Related Report
      2010 Annual Research Report
  • [Presentation] 特異点の問題2010

    • Author(s)
      S.Ishii
    • Organizer
      複素幾何学の諸問題
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2010-09-07
    • Related Report
      2010 Annual Research Report
  • [Presentation] Mather discrepancy and arc spaces2010

    • Author(s)
      S.Ishii
    • Organizer
      Algebraic Geometry and its Applications Abhyankar's 80th birthday Conference
    • Place of Presentation
      Purdue University (USA)
    • Year and Date
      2010-07-21
    • Related Report
      2010 Annual Research Report
  • [Presentation] Some topics on F-thresholds2010

    • Author(s)
      K.Watanabe
    • Organizer
      Workshop on Local Rings and Local Study of Algebraic Varieties
    • Place of Presentation
      ICTP Trieste, Itajy
    • Year and Date
      2010-06-07
    • Related Report
      2010 Annual Research Report
  • [Presentation] Some topics on F-thresholds2010

    • Author(s)
      K.Watanabe
    • Organizer
      Frobenius splitting in algebraic geometry, commutative algebra, and representation theory
    • Place of Presentation
      University of Michigan (USA)
    • Year and Date
      2010-05-18
    • Related Report
      2010 Annual Research Report
  • [Presentation] Introduction to F-singularities2010

    • Author(s)
      S.Takagi
    • Organizer
      Frobenius splitting in algebraic geometry, commutative algebra, and representation theory
    • Place of Presentation
      University of Michigan (USA)
    • Year and Date
      2010-05-17
    • Related Report
      2010 Annual Research Report
  • [Presentation] On J-canonical singularities

    • Author(s)
      Shihoko Ishii
    • Organizer
      4th Workshop on Higher Dimensional Algebraic Geometry
    • Place of Presentation
      台湾大学,(台湾)
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] Singularities with respect to Mather-Jacobian discrepancy,

    • Author(s)
      Shihoko Ishii
    • Organizer
      Workshop,The Commutative Algebra of Singularities in Birational Geometry:
    • Place of Presentation
      MSRI (アメリカ,バークレイ)
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] MJ-discrepancy and Shokurov's conjecture,

    • Author(s)
      Shihoko Ishii
    • Organizer
      Workshop, Complex Algebraic Geometry,
    • Place of Presentation
      Oberwolfach(ドイツ)
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] Singularities with respect to Mather-Jacobian discrepancies

    • Author(s)
      Shihoko Ishii
    • Organizer
      Geometry and Topolocy of Singular Varieties
    • Place of Presentation
      Math. Institute, Hanoi(ベトナム)
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] Commutative Algebra and its interaction to Algebraic Geometry and Combinatorics,

    • Author(s)
      Shihoko Ishii
    • Organizer
      Conference of Commutative Algebra
    • Place of Presentation
      VIASM, Hanoi(ベトナム)
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] Arc spaces now

    • Author(s)
      S.Ishii
    • Organizer
      特異点とそのひろがり
    • Place of Presentation
      京都大学
    • Related Report
      2011 Annual Research Report
    • Invited
  • [Presentation] The arc space of a variety

    • Author(s)
      S.Ishii
    • Organizer
      幾何学シンポジウム
    • Place of Presentation
      山口大学
    • Related Report
      2011 Annual Research Report 2010 Annual Research Report
    • Invited
  • [Presentation] Multiplier ideal via Mather discrepancy

    • Author(s)
      S.Ishii
    • Organizer
      6th Franco-Japanese symposium on Singularities
    • Place of Presentation
      九州大学
    • Related Report
      2011 Annual Research Report 2010 Annual Research Report
    • Invited
  • [Presentation] Geometry of arc space and algebraic geometry

    • Author(s)
      S.Ishii
    • Organizer
      2011年度代数学賞受賞特別講演
    • Place of Presentation
      信州大学
    • Related Report
      2011 Annual Research Report 2010 Annual Research Report
    • Invited
  • [Presentation] Applications of arc spaces to birational geometry I, II

    • Author(s)
      S.Ishii
    • Organizer
      Workshop Artin Approximation and Arcs
    • Place of Presentation
      Ervin Schlessinger Institut Vienna
    • Related Report
      2011 Annual Research Report
    • Invited
  • [Presentation] Jet closures and local isomorphism problem

    • Author(s)
      S.Ishii
    • Organizer
      Arithmetic and Algebraic Geometry
    • Place of Presentation
      東京大学
    • Related Report
      2011 Annual Research Report 2010 Annual Research Report
    • Invited
  • [Presentation] Jet closures and local isomorphism problem

    • Author(s)
      S.Ishii
    • Organizer
      Topology of Singularities in Dalat
    • Place of Presentation
      Dalat University (Vietnam)
    • Related Report
      2011 Annual Research Report
    • Invited
  • [Presentation] On J-canonical singularities

    • Author(s)
      S.Ishii
    • Organizer
      4th Workshop on Higher Dimensional Algebraic Geometry
    • Place of Presentation
      台湾大学
    • Related Report
      2011 Annual Research Report
    • Invited
  • [Presentation] Existence of good ideals in 2-dimensional normal Gorenstein rings

    • Author(s)
      K.-i. Watanabe
    • Organizer
      Commutative Algebra Seminar
    • Place of Presentation
      MSRI, UC Berkeley
    • Related Report
      2011 Annual Research Report
    • Invited
  • [Presentation] On a correspondence between log canonicity and F-purity

    • Author(s)
      S.Takagi
    • Organizer
      特異点とそのひろがり
    • Place of Presentation
      京都大学
    • Related Report
      2011 Annual Research Report
    • Invited
  • [Presentation] On a correspondence between log canonicity and F-purity

    • Author(s)
      S.Takagi
    • Organizer
      代数幾何学城崎シンポジウム
    • Place of Presentation
      城崎大会議館
    • Related Report
      2011 Annual Research Report
    • Invited
  • [Presentation] F-purity of isolated log canonical singularities

    • Author(s)
      S.Takagi
    • Organizer
      第33回可換環論シンポジウム
    • Place of Presentation
      浜名湖カリアック
    • Related Report
      2011 Annual Research Report
    • Invited
  • [Presentation] F-purity of isolated log canonical singularities

    • Author(s)
      S.Takagi
    • Organizer
      Algebraic Geometry in East Asia 2011
    • Place of Presentation
      台湾大学
    • Related Report
      2011 Annual Research Report
    • Invited
  • [Presentation] A characterization of log Fano varieties

    • Author(s)
      S.Takagi
    • Organizer
      Arithmetic and Algebraic Geometry 2012
    • Place of Presentation
      東京大学
    • Related Report
      2011 Annual Research Report
    • Invited
  • [Presentation] A characterization of log Fano varieties via Cox rings

    • Author(s)
      S.Takagi
    • Organizer
      Special Session on Singularities in Commutative Algebra and Algebraic Geometry
    • Place of Presentation
      University of Kansas
    • Related Report
      2011 Annual Research Report
    • Invited
  • [Presentation] C*-equivariant degenerations of curves and normal surface singularities with C*-action

    • Author(s)
      T.Tomaru
    • Organizer
      Topology of singularities and related topics, III
    • Place of Presentation
      Dalat (Vietnam)
    • Related Report
      2011 Annual Research Report
    • Invited
  • [Book] Introduction to Singularities2014

    • Author(s)
      Shihoko Ishii
    • Total Pages
      219
    • Publisher
      Springer Verlag
    • Related Report
      2013 Annual Research Report 2012 Annual Research Report
  • [Book] 数学の道しるべ - 研究者の道とは何か2011

    • Author(s)
      石井 志保子(共著者19名)
    • Total Pages
      202
    • Publisher
      サイエンス社
    • Related Report
      2011 Annual Research Report
  • [Book] 「キュリー夫人伝」 科学者の本棚2011

    • Author(s)
      石井 志保子(共著者64名)
    • Total Pages
      256
    • Publisher
      岩波書店
    • Related Report
      2011 Annual Research Report
  • [Book] 数学の道しるべ-研究者の道とは何か2011

    • Author(s)
      石井志保子(共著者19名)
    • Total Pages
      202
    • Publisher
      サイエンス社
    • Related Report
      2010 Annual Research Report
  • [Book] 「キュリー夫人伝」科学者の本棚2011

    • Author(s)
      石井志保子(共著者64名)
    • Total Pages
      256
    • Publisher
      岩波書店
    • Related Report
      2010 Annual Research Report

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Published: 2010-08-23   Modified: 2019-07-29  

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