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Unipotent structure of higher dimensional algebraic varieties and automorphism groups

Research Project

Project/Area Number 16K05115
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Algebra
Research InstitutionKwansei Gakuin University

Principal Investigator

Miyanishi Masayoshi  関西学院大学, 特定プロジェクト研究センター, 客員研究員 (80025311)

Co-Investigator(Kenkyū-buntansha) 増田 佳代  関西学院大学, 理工学部, 教授 (40280416)
Project Period (FY) 2016-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywordsアフィン空間 / ファイブレーション / 加法群 / ユニポテント群 / 正標数 / 代数曲面 / 特異点 / 商射 / 商多様体 / ジャコビアン予想 / 多項式環 / 商多様体と商射 / 特異ファイバー / 一般ジャコビアン予想 / ユニポテント幾何 / 正標数代数曲面 / アフィン代数多様体 / 不分岐自己準同型射 / 代数学 / 代数幾何
Outline of Final Research Achievements

Description of structures of higher-dimensional algebraic varieties via affine space fibrations. In particular, description of the quotient morphisms of affine algebraic varieties via unipotent group actions. These studies will be published as a book (June, 2021).
Description of phenomena which occur for algebraic surfaces in positive characteristic. The results were published as a book (June, 2020).

Academic Significance and Societal Importance of the Research Achievements

本研究は空間の,代数的に記述できる,幾何学的性質や認識方法と関係している.幾何学的性質は複素数体上で記述されるが,正標数pの場合には,幾何学的性質の標数pによる退化(reduction)に関係する.代数的記述とは,多項式を使ってなされるもので,数学の枠を超えて,数学的手法を用いる科学分野全般に関わる.

Report

(6 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (30 results)

All 2020 2019 2018 2017 2016 Other

All Int'l Joint Research (1 results) Journal Article (9 results) (of which Int'l Joint Research: 8 results,  Peer Reviewed: 8 results,  Open Access: 4 results,  Acknowledgement Compliant: 2 results) Presentation (16 results) (of which Int'l Joint Research: 14 results,  Invited: 16 results) Book (4 results)

  • [Int'l Joint Research] Indian Institute of Technology Bombay(インド)

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Triviality of affine space fibrations2020

    • Author(s)
      R.V. Gurjar, K. Masuda, M. Miyanishi
    • Journal Title

      Springer Proceedingson PRAAG 2018

      Volume: ー Pages: 16-42

    • DOI

      10.1007/978-3-030-42136-6_6

    • ISBN
      9783030421359, 9783030421366
    • Related Report
      2020 Annual Research Report 2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Factorial affine G_a-varieties isomorphic to hypersurfaces of Danielewski type2020

    • Author(s)
      Kayo Masuda
    • Journal Title

      Transformation Groups

      Volume: ー Issue: 4 Pages: 1-19

    • DOI

      10.1007/s00031-020-09631-y

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Affine threefolds with G_a actions2019

    • Author(s)
      R.V. Gurjar, M. koras, K. Masuda, M. Miyanishi, P. Russell
    • Journal Title

      Mathematische Annalen

      Volume: 373 Pages: 1211-1236

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Affine threefolds admitting Ga-actions2018

    • Author(s)
      Gurjar R. V.、Koras M.、Masuda K.、Miyanishi M.、Russell P.
    • Journal Title

      Mathematische Annallen

      Volume: - Issue: 3-4 Pages: 1-26

    • DOI

      10.1007/s00208-017-1622-3

    • Related Report
      2018 Research-status Report 2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Affine space fibrations2018

    • Author(s)
      R.V. Gurjar, K. Masuda, M. Miyanishi
    • Journal Title

      Oberwolfach Preprints

      Volume: separate volume Pages: 1-51

    • DOI

      10.14760/OWP-2018-19

    • Related Report
      2018 Research-status Report
    • Open Access / Int'l Joint Research
  • [Journal Article] Unipotent group actions on projective varieties2017

    • Author(s)
      Rajendra V. Gurjar, Kayo Masuda, Masayoshi Miyanishi
    • Journal Title

      Advanced Studies in Pure Mathematics

      Volume: 75 Pages: 119-162

    • Related Report
      2017 Research-status Report 2016 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Wild Z/pZ-actions on algebraic surfaces2017

    • Author(s)
      宮西正宜
    • Journal Title

      Journal of Algebras

      Volume: 477 Pages: 360-389

    • DOI

      10.1016/j.jalgebra.2016.12.025

    • Related Report
      2017 Research-status Report 2016 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Pure subrings of commutative rings2016

    • Author(s)
      宮西正宜
    • Journal Title

      Nagoya Mathematical Journal

      Volume: 221 Issue: 1 Pages: 33-68

    • DOI

      10.1017/nmj.2016.2

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Affine threefolds with A^2-fibrations2016

    • Author(s)
      宮西正宜
    • Journal Title

      Transformation Groups

      Volume: 22 Issue: 1 Pages: 187-205

    • DOI

      10.1007/s00031-016-9379-4

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Presentation] Triviality of affine space fibration2019

    • Author(s)
      M. Miyanishi
    • Organizer
      Conference in geometry and representations
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Triviality of affine space fibrations2019

    • Author(s)
      M. Miyanishi
    • Organizer
      The 17th meeting of affine algebraic geometry
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Triviality of affine space fibrations2019

    • Author(s)
      M. Miyanishi
    • Organizer
      Conference in geometry and representations
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Hypersurfaces with Ga-actions2019

    • Author(s)
      K. Masuda
    • Organizer
      The 17th Meeting of Affine Algebraic Geometry
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Singular fibers of A^1-fibrations2018

    • Author(s)
      M. Miyanishi
    • Organizer
      Polynomial rings and Affine algebraic geometry (PRAAG 2018)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Geometry of Artin-Schreier coverings2018

    • Author(s)
      M. Miyanishi
    • Organizer
      The 16th Meeting of Affina Algebraic Geometry
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Affine space fibration2018

    • Author(s)
      M. Miyanishi
    • Organizer
      Algebraic Geometry-Mariusz Koras in memoriam
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Singular fibers of A^1-fibrations2018

    • Author(s)
      Masayoshi Miyanishi
    • Organizer
      Polynomial rings and Affine algebraic geometry (PRAAG 2018)
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] G_a-actions in positive characteristic2018

    • Author(s)
      宮西正宜
    • Organizer
      野田代数幾何学シンポジウム
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] Forms of A^3 with unipotent group actions2018

    • Author(s)
      Kayo Masuda
    • Organizer
      Polynomial rings and Affine algebraic geometry (PRAAG 2018)
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Some applications of Jacobson's Galois theory for purely inseparable extension of exponent 12017

    • Author(s)
      宮西正宜
    • Organizer
      Noda Algebraic Geometry Symposium 2017
    • Place of Presentation
      東京理科大学理工学部(千葉県・野田市)
    • Year and Date
      2017-03-23
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] A remark on the generalized Jacobian conjecture for A^2/G2017

    • Author(s)
      宮西正宜
    • Organizer
      The 15th Meeting of Affine Algebraic Geometry
    • Place of Presentation
      関西学院大学大阪梅田キャンパス(大阪府・大阪市北区)
    • Year and Date
      2017-03-03
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] A remark on the generalized Jacobian conjecture for A^2/G2017

    • Author(s)
      宮西正宜
    • Organizer
      Higher-dimensional birational geometry, holomorphic dynamics and their interactions
    • Place of Presentation
      Singapore (Singapore)
    • Year and Date
      2017-01-12
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] A remark on the generalized Jacobian conjecture for A^2/G2017

    • Author(s)
      Masayoshi Miyanishi
    • Organizer
      Higher-dimensional birational geometry, holomorphic dynamics
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Geometry of Artin-Schreier coverings2017

    • Author(s)
      Masayoshi Miyanishi
    • Organizer
      The 16th Meeting of Affina Algebraic Geometry
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Affine threefolds with G_a-actions2016

    • Author(s)
      宮西正宜
    • Organizer
      Complex affine geometry, hyperbolicity and complex analysis
    • Place of Presentation
      Grenoble (France)
    • Year and Date
      2016-10-28
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Book] Algebraic surfaces in positive characteristics2020

    • Author(s)
      Masayoshi Miyanishi, Hiroyuki Ito
    • Total Pages
      441
    • Publisher
      World Scientifics Publishing Co. Pte. Ltd.
    • ISBN
      9789811215223
    • Related Report
      2020 Annual Research Report
  • [Book] Algebraic surfaces in positive characteristics2020

    • Author(s)
      M. Miyanishi, H. Ito
    • Total Pages
      450
    • Publisher
      World Scientific
    • ISBN
      9789811215209
    • Related Report
      2019 Research-status Report
  • [Book] Algebraic surfaces in positive characteristic2019

    • Author(s)
      M. Miyanishi, H. Ito
    • Total Pages
      400
    • Publisher
      World Scientific
    • Related Report
      2018 Research-status Report
  • [Book] 代数曲線入門2016

    • Author(s)
      宮西正宜・増田佳代
    • Total Pages
      161
    • Publisher
      共立出版
    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2022-01-27  

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