• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Surface-knots and 2-dimensional braids

Research Project

Project/Area Number 15K17532
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Geometry
Research InstitutionKanazawa University (2018)
The University of Tokyo (2015-2017)

Principal Investigator

Nakamura Inasa  金沢大学, 電子情報通信学系, 准教授 (60568161)

Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Keywords曲面結び目 / 2次元ブレイド / チャート / 結び目 / 1-ハンドル / 結び目理論 / トポロジー
Outline of Final Research Achievements

I studied surface-knots in a 4-dimensional space, in particular “branched covering surface-knots” (2-dimensional braids over a surface-knot). I showed that a branched covering surface-knot can be deformed to a “simplified form” by an addition of 1-handles with chart loops, and I defined an invariant called the simplifying number. Further I obtained several upper bounds of simplifying numbers.

Academic Significance and Societal Importance of the Research Achievements

新しい不変量である「単純化数」を導入し、上からの評価という点において、その性質をいくらか明らかにすることができた。また、分岐被覆曲面結び目は曲面図式上に描かれるある種のグラフ「曲面図式上のチャート」で表されるが、単純化数の評価を得る過程において、「チャート付き曲面図式」の変形方法を発展させることができた。この変形方法の発展により、分岐被覆曲面結び目の図式を用いた扱いにおいて、従来より複雑な変形を用いる研究が可能になった。

Report

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

    (29 results)

All 2019 2018 2017 2016 2015 Other

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Acknowledgement Compliant: 1 results) Presentation (21 results) (of which Int'l Joint Research: 6 results,  Invited: 4 results) Remarks (4 results)

  • [Journal Article] Transformations of partial matchings2019

    • Author(s)
      Inasa Nakamura
    • Journal Title

      Kyungpook Math. J

      Volume: 印刷中

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Branched covering surface-knots with degree three have the simplifying numbers less than three2019

    • Author(s)
      Inasa Nakamura
    • Journal Title

      Topology and its Applications

      Volume: 256 Pages: 26-45

    • DOI

      10.1016/j.topol.2019.01.011

    • NAID

      120006602139

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Simplifying branched covering surface-knots by an addition of 1-handles with chart loops2018

    • Author(s)
      Inasa Nakamura
    • Journal Title

      Journal of Knot Theory and Its Ramifications

      Volume: 27 Issue: 05 Pages: 1850031-1850031

    • DOI

      10.1142/s0218216518500311

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] On addition of 1-handles with chart loops to 2-dimensional braids2016

    • Author(s)
      Inasa Nakamura
    • Journal Title

      Journal of Knot Theory and Its Ramifications

      Volume: 26 Issue: 11 Pages: 1650061-1650061

    • DOI

      10.1142/s0218216516500619

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] Transformations of partial matchings2018

    • Author(s)
      中村伊南沙
    • Organizer
      葉層構造と微分同相群2018研究集会 Foliations and Diffeomorphism Groups 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ブランチ点をもつ分岐被覆曲面結び目の単純化数2018

    • Author(s)
      中村伊南沙
    • Organizer
      日本数学会秋季総合分科会・トポロジー分科会一般講演
    • Related Report
      2018 Annual Research Report
  • [Presentation] Simplifying numbers of branched covering surface-knots2018

    • Author(s)
      中村伊南沙
    • Organizer
      Four Dimensional Topology
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 分岐被覆曲面結び目の単純化数の評価2018

    • Author(s)
      中村伊南沙
    • Organizer
      玉原トポロジー・幾何セミナー2018
    • Related Report
      2018 Annual Research Report
  • [Presentation] 分岐被覆曲面結び目、特にトーラス被覆結び目について2018

    • Author(s)
      中村伊南沙
    • Organizer
      数理学談話会
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Simplifying branched covering surface-knots by chart moves involving black vertices2018

    • Author(s)
      中村伊南沙
    • Organizer
      第41回伊豆トポロジーセミナー
    • Related Report
      2017 Research-status Report
  • [Presentation] Simplifying branched covering surface-knots by chart moves involving black vertices2018

    • Author(s)
      Inasa Nakamura
    • Organizer
      The 13th East Asian School of Knots and Related Topics
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 曲面結び目のチャート表示について2017

    • Author(s)
      中村伊南沙
    • Organizer
      琵琶湖特異点論ワークショップ
    • Related Report
      2017 Research-status Report
  • [Presentation] Simplifying covering surface-knots by an addition of 1-handles with chart loops2017

    • Author(s)
      中村伊南沙
    • Organizer
      葉層構造と微分同相群2017研究集会
    • Related Report
      2017 Research-status Report
  • [Presentation] Simplifying covering surface-knots by an addition of 1-handles with chart loops2017

    • Author(s)
      中村伊南沙
    • Organizer
      ハンドル体結び目とその周辺10・Hurwitz action 7
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] 1-ハンドル付加による被覆曲面結び目の単純化2017

    • Author(s)
      中村伊南沙
    • Organizer
      日本数学会秋季総合分科会・トポロジー分科会一般講演
    • Related Report
      2017 Research-status Report
  • [Presentation] 被覆曲面結び目のチャートループ付き1-ハンドル付加による単純化2017

    • Author(s)
      中村伊南沙
    • Organizer
      玉原トポロジー・幾何セミナー
    • Related Report
      2017 Research-status Report
  • [Presentation] Simplifying covering torus-knots by an addition of 1-handles with chart loops2017

    • Author(s)
      Inasa Nakamura
    • Organizer
      The 12th East Asian School of Knots and Related Topics
    • Place of Presentation
      東京大学(東京都目黒区)
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] On addition of 1-handles with chart loops to 2-dimensional braids2016

    • Author(s)
      中村 伊南沙
    • Organizer
      第39回トポロジーセミナー
    • Place of Presentation
      ホテル伊東ガーデン(静岡県伊東市)
    • Year and Date
      2016-03-22
    • Related Report
      2015 Research-status Report
  • [Presentation] On addition of 1-handles with chart loops to 2-dimensional braids2016

    • Author(s)
      Inasa Nakamura
    • Organizer
      The 11th East Asian School of Knots and Related Topics
    • Place of Presentation
      大阪市立大学(大阪府大阪市)
    • Year and Date
      2016-01-26
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research
  • [Presentation] Unbraiding 2-dimensional braids by an addition of 1-handles with chart loops2016

    • Author(s)
      中村伊南沙
    • Organizer
      4次元トポロジー
    • Place of Presentation
      大阪市立大学(大阪府大阪市)
    • Related Report
      2016 Research-status Report
  • [Presentation] Showing distinctness of surface links by taking 2-dimensional braids2016

    • Author(s)
      中村伊南沙
    • Organizer
      葉層構造と微分同相群2016
    • Place of Presentation
      東京大学玉原国際セミナーハウス(群馬県沼田市)
    • Related Report
      2016 Research-status Report
  • [Presentation] 1-ハンドル付加による2次元ブレイドのブレイド解消操作2016

    • Author(s)
      中村伊南沙
    • Organizer
      日本数学会秋季総合分科会・トポロジー分科会
    • Place of Presentation
      関西大学(大阪府吹田市)
    • Related Report
      2016 Research-status Report
  • [Presentation] Unbraiding 2-dimensional braids by an addition of 1-handles with chart loops2016

    • Author(s)
      Inasa Nakamura
    • Organizer
      KOOK-TAPU Workshop of Knots in Tsushima Island
    • Place of Presentation
      対馬市交流センター(長崎県対馬市)
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] 曲面絡み目上の2次元ブレイド(ポスター発表)2015

    • Author(s)
      中村 伊南沙
    • Organizer
      数学協働プログラム「生命ダイナミクスの数理とその応用:理論からのさらなる深化」
    • Place of Presentation
      東京大学(東京都目黒区)
    • Year and Date
      2015-12-10
    • Related Report
      2015 Research-status Report
  • [Presentation] チャート付き1-ハンドルを付加して得られる2次元ブレイド2015

    • Author(s)
      中村 伊南沙
    • Organizer
      日本数学会秋季総合分科会 トポロジー分科会
    • Place of Presentation
      京都産業大学(京都府京都市)
    • Year and Date
      2015-09-13
    • Related Report
      2015 Research-status Report
  • [Remarks] 金沢大学理工研究域電子情報通信学系 中村伊南沙研究室ホームページ

    • URL

      http://inasa.w3.kanazawa-u.ac.jp/

    • Related Report
      2018 Annual Research Report
  • [Remarks] 金沢大学理工研究域電子情報通信学系 中村伊南沙研究室ホームページ

    • URL

      http://inasa.w3.kanazawa-u.ac.jp

    • Related Report
      2017 Research-status Report
  • [Remarks] 東京大学大学院数理科学研究科 中村伊南沙研究室ホームページ

    • URL

      http://www.ms.u-tokyo.ac.jp/~inasa/index.html

    • Related Report
      2016 Research-status Report
  • [Remarks] 東京大学大学院数理科学研究科中村伊南沙研究室ホームページ

    • URL

      http://www.ms.u-tokyo.ac.jp/~inasa/

    • Related Report
      2015 Research-status Report

URL: 

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

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi