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Developments and applications of geometric singularity theory

Research Project

Project/Area Number 15H03615
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Geometry
Research InstitutionHokkaido University

Principal Investigator

Goo Ishikawa  北海道大学, 理学研究院, 教授 (50176161)

Co-Investigator(Kenkyū-buntansha) 澁谷 一博  広島大学, 理学研究科, 准教授 (00569832)
齋藤 幸子  北海道教育大学, 教育学部, 准教授 (40260400)
佐治 健太郎  神戸大学, 理学研究科, 准教授 (70451432)
高橋 雅朋  室蘭工業大学, 大学院工学研究科, 准教授 (80431302)
大本 亨  北海道大学, 理学研究院, 教授 (20264400)
三松 佳彦  中央大学, 理工学部, 教授 (70190725)
Research Collaborator Machida Yoshinori  
Kitagawa Yumiko  
Janeczko Stanislaw  
Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥16,120,000 (Direct Cost: ¥12,400,000、Indirect Cost: ¥3,720,000)
Fiscal Year 2018: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2017: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2016: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Keywordsフロンタル / ラグランジュ錐構造 / 接線曲面 / 特異点の安定性 / 特異点のロバスト性 / 開化 / 分岐加群 / (2,3,5)分布 / コフロンタル / G2接触構造 / 特異点の認識問題 / フロンタル安定性 / 写像の特異点 / 幾何学的制御理論 / 錐構造 / 特異点の実形 / ジェネリック幾何 / 双対性 / 接触構造 / 幾何構造 / 拘束ハミルトン系 / ニュートラル計量 / 幾何学的解 / 特異制御
Outline of Final Research Achievements

In a space with symmetry, we study the geometric solutions of naturally appeared equations, regarding the characteristic singularities associated to the geometric structure. Under geometric motivations, we analyse and classify singularities and clarify their geometric meanings. Thus we present new methods in geometry and apply them. By this project, we have completed the generic classification of singularities in tangent surfaces under a far general framework. Moreover we have established the classification of tangent surfaces to null curves in any 3-dimensional Lorentz manifold, relating Engel pseudo-product structures, projective contact structures and the geometric theory of third order OED. Furthermore we have succeeded the clarification of the general framework on the G2 duality of (2,3,5)-distributions.

Academic Significance and Societal Importance of the Research Achievements

本研究により,特異点の特徴付けを応用することで,一般空間の空間曲線や不定値計量空間のナル曲線の接線曲面の特異性が,空間の幾何構造を変化させても安定に出現すること,すなわち特異点分類のロバスト(robust, 鈍感) 性を証明することができた.この成果は,様々な幾何構造に関して,クライン幾何学における特異点の分類結果に基づいて,特異性の出現・分類が幾何構造の変形に関してロバスト性を持つかどうかを検証する道を作り,幾何学全般に対して新たな問題提起を促し,幾何構造の特性,幾何構造の間の関係性を改めて問い直す機会も与える.したがって,本研究は人類の空間認識に関する本質的な学術的寄与をしたと考えられる.

Report

(5 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Annual Research Report
  • 2016 Annual Research Report
  • 2015 Annual Research Report
  • Research Products

    (32 results)

All 2019 2018 2017 2016 2015 Other

All Int'l Joint Research (4 results) Journal Article (10 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 10 results,  Open Access: 5 results,  Acknowledgement Compliant: 3 results) Presentation (15 results) (of which Int'l Joint Research: 8 results,  Invited: 8 results) Book (2 results) Remarks (1 results)

  • [Int'l Joint Research] ワルシャワ工科大学(ポーランド)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] ポーランド科学アカデミー/ワルシャワ工科大学(ポーランド)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] ワルシャワ工科大学(ポーランド)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] Warsaw University of Technology(Poland)

    • Related Report
      2015 Annual Research Report
  • [Journal Article] Leibniz complexity of Nash functions on differentiations2019

    • Author(s)
      Goo Ishikawa, Tatsuya Yamashita
    • Journal Title

      Journal of the Mathematical Society of Japan

      Volume: 印刷中

    • NAID

      130007682982

    • Related Report
      2018 Annual Research Report 2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Singularities of tangent surfaces to directed curves2018

    • Author(s)
      Ishikawa G.、Yamashita T.
    • Journal Title

      Topology and its Applications

      Volume: 234 Pages: 198-208

    • DOI

      10.1016/j.topol.2017.11.018

    • Related Report
      2018 Annual Research Report 2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Singularities of frontals2018

    • Author(s)
      Goo Ishikawa
    • Journal Title

      Advanced Studies in Pure Mathematics

      Volume: 78

    • Related Report
      2018 Annual Research Report 2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Residual Algebraic Restrictions of Differential Forms2017

    • Author(s)
      Goo Ishikawa, Stanislaw Janeczko
    • Journal Title

      Methods and Applications of Analysis

      Volume: 24-1 Pages: 045-062

    • Related Report
      2017 Annual Research Report 2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Singularities of tangent surfaces to space curves2017

    • Author(s)
      Goo Ishikawa, Tatsuya Yamashita
    • Journal Title

      Journal of Geometry

      Volume: 108 Issue: 1 Pages: 301-318

    • DOI

      10.1007/s00022-016-0341-3

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Singularities of tangent surfaces in Cartan's split G2-geometry2016

    • Author(s)
      Goo Ishikawa, Yoshinori Machida, Masatomo Takahashi
    • Journal Title

      Asian Journal of Mathematics

      Volume: 20 Issue: 2 Pages: 353-382

    • DOI

      10.4310/ajm.2016.v20.n2.a6

    • NAID

      120006459711

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] D_n-geometry and singularities of tangent surfaces2016

    • Author(s)
      G. Ishikawa, Y. Machida, M. Takahashi
    • Journal Title

      RIMS Kokyuroku Bessatsu

      Volume: 未定

    • NAID

      120006459747

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Monge-Ampere systems with Lagrangian pair2015

    • Author(s)
      G. Ishikawa, Y. Machida
    • Journal Title

      Symmetry, Integrability and Geometry: Methods and Applications (SIGMA)

      Volume: 11

    • DOI

      10.3842/sigma.2015.081

    • NAID

      120005672373

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Geometry of D4 conformal triality and singularities of tangent surfaces2015

    • Author(s)
      Goo Ishikawa, Yoshinori Machida, Masatomo Takahashi
    • Journal Title

      Journal of Singularities

      Volume: 12 Pages: 27-52

    • DOI

      10.5427/jsing.2015.12c

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Classification problems on singularities of mappings and their applications2015

    • Author(s)
      Goo Ishikawa
    • Journal Title

      Sugaku Exposition

      Volume: 28-2 Pages: 189-214

    • NAID

      10030740955

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed
  • [Presentation] Topology of complements to real affine space line arrangements.2019

    • Author(s)
      Goo Ishikawa, Motoki Oyama
    • Organizer
      Spring Central and Western Joint Sectional Meeting, American Mathematical Society.
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Leibniz complexity of Nash functions on differentiations2018

    • Author(s)
      Goo Ishikawa
    • Organizer
      Real Algebraic Geometry and Singularity Theory Symposium
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Topics on frontal singularities2018

    • Author(s)
      Goo Ishikawa
    • Organizer
      15th International Workshop on Real and Complex Singularities, Sao Carlos, Brazil, 22 - 28 July 2018.
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Cofrontals2018

    • Author(s)
      Goo Ishikawa
    • Organizer
      Research on topology and differential geometry using singularity theory of differentiable maps
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Duality of (2,3,5)-distributions and Lagrangian cone structures2018

    • Author(s)
      Goo Ishikawa
    • Organizer
      Contact structure, Singularities, Differential equations and related area
    • Related Report
      2017 Annual Research Report
    • Invited
  • [Presentation] Stability of parametric Lagrangian and Legendrian varieties2017

    • Author(s)
      Goo Ishikawa
    • Organizer
      International Conference on Singularity Theory and Dynamical Systems
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Duality-singularity of indefinite metrics and contact structures2017

    • Author(s)
      Goo Ishikawa
    • Organizer
      Singularities in Generic Geometry and its Applications
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Duality-singularity of indefinite metrics and contact structures2017

    • Author(s)
      Goo Ishikawa
    • Organizer
      24th Numazu conference
    • Place of Presentation
      沼津高専(静岡県・沼津市)
    • Related Report
      2016 Annual Research Report
    • Invited
  • [Presentation] Duality-singularity of indefinite metrics and contact structures2017

    • Author(s)
      Goo Ishikawa
    • Organizer
      Contact structure, Singularities, Differential equations and related area
    • Place of Presentation
      金沢大学サテライト(石川県・金沢市)
    • Related Report
      2016 Annual Research Report
  • [Presentation] Null frontal singular surfaces in Lorentzian 3-spaces2016

    • Author(s)
      Goo Ishikawa
    • Organizer
      VIII International Meeting on Lorentzian Geometry
    • Place of Presentation
      マラガ(スペイン)
    • Year and Date
      2016-09-20
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] アフィン接続と空間曲線の接線曲面の特異点2016

    • Author(s)
      石川剛郎,山下達也
    • Organizer
      日本数学会2016年度年会
    • Place of Presentation
      筑波大学(茨城県・つくば市)
    • Year and Date
      2016-03-18
    • Related Report
      2015 Annual Research Report
  • [Presentation] Nash 関数の微分に関する Leibniz 複雑性2016

    • Author(s)
      石川剛郎,山下達也
    • Organizer
      日本数学会2016年度年会
    • Place of Presentation
      筑波大学(茨城県・つくば市)
    • Year and Date
      2016-03-16
    • Related Report
      2015 Annual Research Report
  • [Presentation] 特異点論の地図2016

    • Author(s)
      石川剛郎
    • Organizer
      Encounter with Mathematics
    • Place of Presentation
      中央大学理工学部(東京都・文京区)
    • Year and Date
      2016-03-12
    • Related Report
      2015 Annual Research Report
    • Invited
  • [Presentation] ニュートラル計量,ローリング・ボディ,そしてケプラー問題2016

    • Author(s)
      石川剛郎
    • Organizer
      第23回沼津研究会
    • Place of Presentation
      沼津工業高等専門学校(静岡県・沼津市)
    • Year and Date
      2016-03-08
    • Related Report
      2015 Annual Research Report
    • Invited
  • [Presentation] Leibniz complexity of Nash functions on differentiations2015

    • Author(s)
      Goo Ishikawa
    • Organizer
      Geometric Singularity Theory, Polish-Japanese Singularity Theory Working Days
    • Place of Presentation
      Warsaw (Poland)
    • Year and Date
      2015-09-09
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research / Invited
  • [Book] Singularities of Curves and Surfaces in Various Geometric Problems2015

    • Author(s)
      Goo Ishikawa
    • Total Pages
      94
    • Publisher
      Center for Advanced Studies, Warsaw University of Technology, Warsaw
    • Related Report
      2015 Annual Research Report
  • [Book] 論理・集合・数学語2015

    • Author(s)
      石川剛郎
    • Total Pages
      190
    • Publisher
      共立出版
    • Related Report
      2015 Annual Research Report
  • [Remarks] http://www.math.sci.hokudai.ac.jp/~ishikawa

    • Related Report
      2015 Annual Research Report

URL: 

Published: 2015-04-16   Modified: 2020-03-30  

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