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

Extended knots and their invariants

Research Project

Project/Area Number 19K03496
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

Kamada Naoko  名古屋市立大学, 大学院理学研究科, 教授 (60419687)

Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords結び目 / 拡張結び目 / 不変量 / 仮想結び目 / 溶接結び目
Outline of Research at the Start

拡張結び目とは結び目の概念を拡張した研究対象で、結び目図式を表す Gauss 図式から実現される仮想交点を許した結び目図式のある種の同値類である仮想結び目が代表的な例である。その他に溶接結び目、twisted knotなどがある。これらと4次元内のリボン曲面、結び目の不変量との関係が知られており、結び目の分類にも応用される.また国内外で活発に研究されている。本研究では、これらの拡張結び目を様々な観点から解析することにより広い概念からの結び目理論における解析手法の発展を目指す。

Outline of Final Research Achievements

Extended knots are extensions of knots, but they exhibit various differences in geometric properties, which can sometimes prevent the natural utilization or extension of conventional research methods for knots, including knot invariants. In this study, we investigated the geometric properties of extended knots (virtual knots, twisted knots, and welded knots), and obtained results. Furthermore, we introduced invariants and classification methods for virtual knots, twisted knots, and others, and showed examples of their applications.

Academic Significance and Societal Importance of the Research Achievements

結び目理論はトポロジーの一分野であり、拡張結び目は結び目を様々な視点で拡張した概念であり、その視点には幾何学的特徴や結び目不変量などがある。幾何学的特徴や結び目不変量を広い視点で調べることはその構造や性質の理解につながる。結び目不変量は代数系への写像であり代数学への応用が考えられる。本研究での拡張結び目の幾何学的側面や不変量に関する成果は、トポロジーや代数学への寄与が期待できる。

Report

(6 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (25 results)

All 2023 2022 2021 2020 2019

All Journal Article (6 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 6 results,  Open Access: 3 results) Presentation (19 results) (of which Int'l Joint Research: 10 results,  Invited: 14 results)

  • [Journal Article] Diagrams realizing prescribed sublink diagrams for virtual links and welded links2023

    • Author(s)
      Naoko Kamada
    • Journal Title

      Diagrams realizing prescribed sublink diagrams for virtual links and welded links 鎌田直子 The KOBE JOURNAL of MATHEMATICS

      Volume: 40 Pages: 57-68

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A table of twisted knots with crossing number 32023

    • Author(s)
      Naoko Kamada, Shigeto Kawata, Kaori Okubo, Akinobu Shimizu
    • Journal Title

      Osaka Journal of Mathematics

      Volume: 60 Pages: 239-266

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Conversion to almost classical virtual links and pseudo Goeritz matrices2022

    • Author(s)
      Kamada Naoko
    • Journal Title

      Journal of Knot Theory and Its Ramifications

      Volume: 31 Issue: 14

    • DOI

      10.1142/s0218216522500985

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Doodles and commutator identities2022

    • Author(s)
      Bartholomew Andrew、Fenn Roger、Kamada Naoko、Kamada Seiichi
    • Journal Title

      Journal of Knot Theory and Its Ramifications

      Volume: 31 Issue: 08

    • DOI

      10.1142/s0218216522400016

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A multivariable polynomial invariant of virtual links and cut systems2021

    • Author(s)
      Naoko Kamada
    • Journal Title

      Topology and its Applications

      Volume: 301 Pages: 1075181-13

    • DOI

      10.1016/j.topol.2020.107518

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Virtual links which are equivalent as twisted links2020

    • Author(s)
      Kamada Naoko、Kamada Seiichi
    • Journal Title

      Proceedings of the American Mathematical Society

      Volume: 148 Issue: 5 Pages: 2273-2285

    • DOI

      10.1090/proc/14899

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Oriented cut systems and invariants of virtual and twisted links2023

    • Author(s)
      Naoko Kamada
    • Organizer
      Iberoamerican and Pan Pacific International Conference on Topology and its Applications
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Cut points and virtual link diagrams2023

    • Author(s)
      Naoko Kamada
    • Organizer
      The 14th KOOK-TAPU Joint Seminar on Knots and Related Topics
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Virtual and twisted link diagrams and their sublink diagrams2023

    • Author(s)
      Naoko Kamada
    • Organizer
      The 18th East Asian Conference on Geometric Topology
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Virtual link diagram とその sublink diagram2022

    • Author(s)
      鎌田直子
    • Organizer
      日本数学会 秋季分科会 2022
    • Related Report
      2022 Research-status Report
  • [Presentation] 仮想絡み目ダイアグラムの変形2022

    • Author(s)
      鎌田直子
    • Organizer
      拡大KOOKセミナー 2022
    • Related Report
      2022 Research-status Report
  • [Presentation] 仮想絡み目ダイアグラムとその部分ダイアグラム2022

    • Author(s)
      鎌田直子
    • Organizer
      東京女子大学トポロジーセミナー
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Virtual and welded link diagrams and their sublink diagrams2022

    • Author(s)
      Naoko Kamada
    • Organizer
      Knot theory and Applications
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Cut systems and the n writhes of virtual knots2022

    • Author(s)
      鎌田直子
    • Organizer
      The 17th East Asian Conference on Geometric Topology
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] virtual link diagramの変換とその応用2021

    • Author(s)
      鎌田直子
    • Organizer
      研究集会「結び目理論」
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Pseudo Goeritz invariants of virtual link diagrams2021

    • Author(s)
      Naoko Kamada
    • Organizer
      The 12th TAPU-KOOK Joint Seminar on Knots and Related Topics
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Pseudo Goeritz matrices for virtual link diagrams2021

    • Author(s)
      Naoko Kamada
    • Organizer
      The 16th East Asian Conference on Geometric Topology
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Pseudo Goeritz matrices for virtual links2020

    • Author(s)
      Naoko Kamada
    • Organizer
      First Korean-Russian Conference on Knot theory and Related Topics
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] virtual linkとtwisted link2020

    • Author(s)
      鎌田直子
    • Organizer
      N-KOOKセミナー 10月会合
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] virtual knotのpseudo Goeritz行列2020

    • Author(s)
      鎌田直子
    • Organizer
      拡大KOOKセミナー 2020
    • Related Report
      2020 Research-status Report
  • [Presentation] On almost classical virtual links2020

    • Author(s)
      Naoko Kamada
    • Organizer
      The 15th East Asian Conference on Geometric Topology
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Constructing almost classical virtual links from virtual links2020

    • Author(s)
      Naoko Kamada
    • Organizer
      The JMM special session on Self-Distributive Structures, Knot Theory and the Yang-Baxter Equation
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] A multivariable polynomial invariant of virtual links and cut systems2019

    • Author(s)
      Naoko Kamada
    • Organizer
      Third Pan-Pacific International Conference on Topology and Applications
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Converting virtual knots to almost classical virtual knots2019

    • Author(s)
      Naoko Kamada
    • Organizer
      International Workshop Knots in Tsushima
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Almost classical virtual knot について2019

    • Author(s)
      鎌田直子
    • Organizer
      拡大 KOOK セミナー
    • Related Report
      2019 Research-status Report

URL: 

Published: 2019-04-18   Modified: 2025-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi