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Theory of transformations of charts

Research Project

Project/Area Number 18K03309
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 11020:Geometry-related
Research InstitutionTokai University

Principal Investigator

Shima Akiko  東海大学, 理学部, 教授 (50317765)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords曲面結び目 / チャート / surface link / chart / white vertex / crossing
Outline of Final Research Achievements

Kamada developed a display of a surface-knot in the 4-dimensinal space by drawing a graph in the plane called a chart. We want to make a table of surface-knots by using charts. We almost classify 4-charts with 2 crossings (having edges of labels 1, 2 or 3). To classify completely, we calculate the fundamental groups of the complements of surface-knots, and we calculate colorings for quandles. Then there are at least 10 surface-knots for the 4-charts. However we do not understand there are infinity many surface-knots for the 4-charts.
We research charts with 8 white vertices. We show that there do not exist any lens in minimal 6-charts of type (2,2,2,2).

Academic Significance and Societal Importance of the Research Achievements

幾何学の分野で、図形を分類するのは大きな目標である。その中の4次元空間内の曲面(曲面結び目)の分類に貢献した研究である。曲面結び目は実際に描くことが難しいようであるが、鎌田氏により、平面のグラフ(チャートという)で描くことが可能になった。そのため、大まかな分類が可能になり、詳細な分類のためにコンピューターを使って、彩色数を計算することが出来た。完全な分類にはまだまだ道半ばであるが、2個の交差をもつ4-チャートの中に10種類以上の何か未知の曲面結び目が見つかり、私としては興味深い研究であった。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (10 results)

All 2020 2019 2018

All Journal Article (6 results) (of which Peer Reviewed: 6 results) Presentation (4 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Properties of minimal charts and their applications VII: Charts of type (2,3,2)2020

    • Author(s)
      Nagase Teruo、Shima Akiko
    • Journal Title

      Topology and its Applications

      Volume: 284 Pages: 107365-107365

    • DOI

      10.1016/j.topol.2020.107365

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Properties of minimal charts and their applications VI: the graph Γm+1 in a chart Γ of type (m; 2; 3; 2)2020

    • Author(s)
      Nagase Teruo、Shima Akiko
    • Journal Title

      J. Math. Sci. Univ. Tokyo

      Volume: 27

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Properties of minimal charts and their applications V: Charts of type (3,2,2)2019

    • Author(s)
      Nagase Teruo、Shima Akiko
    • Journal Title

      Journal of Knot Theory and Its Ramifications

      Volume: 28 Issue: 14 Pages: 1950084-1950084

    • DOI

      10.1142/s0218216519500846

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] The structure of a minimal n-chart with two crossings II2019

    • Author(s)
      Nagase Teruo、Shima Akiko
    • Journal Title

      Revista de la Real Academia de Ciencias Exactas, Fisicas y Naturales. Serie A. Matematicas

      Volume: 113 Issue: 3 Pages: 1693-1738

    • DOI

      10.1007/s13398-018-0573-1

    • Related Report
      2019 Research-status Report 2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] The structure of a minimal n-chart with two crossings I: Complementary domains of Γ1 ∪ Γn-12018

    • Author(s)
      Nagase Teruo、Shima Akiko
    • Journal Title

      Journal of Knot Theory and Its Ramifications

      Volume: 27 Issue: 14 Pages: 1850078-1850078

    • DOI

      10.1142/s0218216518500785

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Minimal charts2018

    • Author(s)
      Nagase Teruo、Shima Akiko
    • Journal Title

      Topology and its Applications

      Volume: 241 Pages: 291-332

    • DOI

      10.1016/j.topol.2018.04.001

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] There is no minimal chart of type (2,3,2)2020

    • Author(s)
      志摩亜希子
    • Organizer
      ひねる代数~Hurwitz action とその周辺~
    • Related Report
      2019 Research-status Report
  • [Presentation] There is no minimal chart of type (2,3,2)2019

    • Author(s)
      志摩亜希子
    • Organizer
      五箇山トポロジー・幾何セミナー2019
    • Related Report
      2019 Research-status Report
  • [Presentation] Minimal 4-charts with two crossings2018

    • Author(s)
      志摩亜希子
    • Organizer
      玉原トポロジー・幾何セミナー2018
    • Related Report
      2018 Research-status Report
  • [Presentation] The structure of a minimal n-chart with two crossings2018

    • Author(s)
      Akiko Shima
    • Organizer
      Four Dimensional Topology
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research

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Published: 2018-04-23   Modified: 2022-01-27  

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