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

Complementary study on dynamical systems and foliations using methods of partially ordered set and general topology

Research Project

Project/Area Number 20K03583
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 11020:Geometry-related
Research InstitutionSaitama University (2023)
Gifu University (2021-2022)
Kyoto University of Education (2020)

Principal Investigator

Yokoyama Tomoo  埼玉大学, 理工学研究科, 教授 (30613179)

Project Period (FY) 2020-04-01 – 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 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Keywords力学系 / トポロジー / 葉層構造 / 位相不変量 / 半順序 / 遷移グラフ / 一般位相空間論
Outline of Research at the Start

力学系理論は,微分方程式の解の定性的な研究として始まり,どのような流れがジェネリックかという問題などを扱い発展してきた.一方,葉層構造理論は,微分方程式の解曲線の集まりからなる多様体上の1次元構造や,一般の高次元構造の大域的な研究として発展してきた.このように力学系と葉層構造は関連する対象を異なる角度から研究が行われてきた.本研究では,これら2つの関連深い理論の手法を融合することにより,既存の研究をより精度の高い解析に発展させる.

Outline of Final Research Achievements

We refined the existing representation of the topological invariant of Hamiltonian flows on surfaces, constructed an expression for flows of finite type on surfaces, and constructed a framework for analyzing a broader class of fluid phenomena. We have constructed new topological invariants, which generalize Morse graphs of flows on metric spaces, CW complex structures associated with Morse-Smale flows, and Reeb graphs for generic Hamiltonian flows on surfaces. We have demonstrated that some recurrent concepts (e.g. Poisson stable, recurrent) for the orbit class spaces can be characterized using the separation axiom and partial order.

Academic Significance and Societal Importance of the Research Achievements

曲面上の微分方程式の解などの流れを記述できる有限位相不変量を構成したことにより,トポロジーの意味で情報を失わずに,ある種の微分方程式の解を遷移グラフ上のウォークに変換できることを示した.これにより,対称性の高い流れなどのトポロジーを表現し解析することができるようになった.
Morseグラフ・Morse-Smale流の付随するCW複体構造・曲面上のジェネリックなHamilton流のReeb graphの一般化となるような新しい高次元の流れの位相不変量の構成したことは,これまで別々に扱われていた研究を統合的に扱う枠組みを提供している.よって,異なる分野の手法の融合による新しい解析が期待される.

Report

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

    (43 results)

All 2024 2023 2022 2021 2020 Other

All Int'l Joint Research (6 results) Journal Article (8 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 8 results,  Open Access: 1 results) Presentation (26 results) (of which Int'l Joint Research: 9 results,  Invited: 2 results) Remarks (2 results) Patent(Industrial Property Rights) (1 results) (of which Overseas: 1 results)

  • [Int'l Joint Research] University of Porto(ポルトガル)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] Moscow State University(ロシア連邦)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] University of Porto(ポルトガル)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] Moscow State University(ロシア連邦)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] University of Porto(ポルトガル)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Moscow State University(ロシア連邦)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Topological characterizations of recurrence, Poisson stability, and isometric property of flows on surfaces2023

    • Author(s)
      Yokoyama Tomoo
    • Journal Title

      Israel Journal of Mathematics

      Volume: - Issue: 2 Pages: 951-975

    • DOI

      10.1007/s11856-023-2601-x

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Dependency of the positive and negative long-time behaviors of flows on surfaces2023

    • Author(s)
      Yokoyama Tomoo
    • Journal Title

      Journal of Differential Equations

      Volume: 368 Pages: 376-393

    • DOI

      10.1016/j.jde.2023.06.008

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Topological characterizations of Morse-Smale flows on surfaces and generic non-Morse-Smale flows2022

    • Author(s)
      Kibkalo Vladislav、Yokoyama Tomoo
    • Journal Title

      Discrete and Continuous Dynamical Systems

      Volume: 42 Issue: 10 Pages: 4787-4787

    • DOI

      10.3934/dcds.2022072

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Discrete representations of orbit structures of flows for topological data analysis2022

    • Author(s)
      Sakajo Takashi、Yokoyama Tomoo
    • Journal Title

      Discrete Mathematics, Algorithms and Applications

      Volume: 2250143 Issue: 06 Pages: 1-38

    • DOI

      10.1142/s1793830922501439

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Flows with time-reversal symmetric limit sets on surfaces2022

    • Author(s)
      Yokoyama Tomoo
    • Journal Title

      Proceedings of the American Mathematical Society

      Volume: 151 Issue: 1 Pages: 161-176

    • DOI

      10.1090/proc/16113

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Refinements of topological invariants of flows2022

    • Author(s)
      Yokoyama Tomoo
    • Journal Title

      Discrete & Continuous Dynamical Systems

      Volume: 42 Issue: 5 Pages: 2295-2295

    • DOI

      10.3934/dcds.2021191

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Topological bifurcation structure of one-parameter families of C 1 unimodal maps2021

    • Author(s)
      Sannami Atsuro、Yokoyama Tomoo
    • Journal Title

      Nonlinearity

      Volume: 34 Issue: 11 Pages: 7991-8016

    • DOI

      10.1088/1361-6544/ac2a4c

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Complete transition diagrams of generic Hamiltonian flows with a few heteroclinic orbits2020

    • Author(s)
      Yokoyama Tetsuo、Yokoyama Tomoo
    • Journal Title

      Discrete Mathematics, Algorithms and Applications

      Volume: 13 Issue: 02 Pages: 2150023-2150023

    • DOI

      10.1142/s1793830921500233

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Topological study of 2D flows and its application2024

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      The Grad Conjecture in Fluid Mechanics and Magnetohydrodynamics: Theory and Applications
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Topological Data Analysis for line fields and its relative topics2024

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      力学系に対する相空間全構造解析と分岐解析の統合による新たなアプローチ
    • Related Report
      2023 Annual Research Report
  • [Presentation] Irregular behavior in foliations2023

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      Dynamics of Foliations
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Generic transitions for flows on surfaces with or without constraints2023

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      ICIAM 2023 Tokyo Minisymposium Topological data analysis and machine learning
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Existence and Non-existence of Length Averages for Foliations2023

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      Geometry and Probability 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 曲面上の流れの正方向と負方向の極限の振る舞いの依存性2023

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      トポロジー火曜セミナー
    • Related Report
      2023 Annual Research Report
  • [Presentation] Dependency of the positive and negative long-time behaviors of flows on surfaces2023

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      力学系理論の展開と応用
    • Related Report
      2023 Annual Research Report
  • [Presentation] 曲面上の流れの極限集合について2023

    • Author(s)
      横山知郎
    • Organizer
      埼玉大学幾何セミナー
    • Related Report
      2023 Annual Research Report
  • [Presentation] 曲面上の流れの正方向と負方向の極限の振る舞いの依存性2023

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      岐阜数理科学セミナー, 岐阜大学
    • Related Report
      2022 Research-status Report
  • [Presentation] Topological invariants for flows on surfaces and metric spaces2022

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      The 2nd POSTECH MINDS Workshop on Topological Data Analysis and Machine Learning
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Existence and Non-existence of Length Averages for Foliations2022

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      Dynamical Systems Seminars, Centro de Matematica da Universidade do Porto, Portugal
    • Related Report
      2022 Research-status Report
  • [Presentation] Cell complex structure of the space of Hamiltonian vector fields on compact surfaces2022

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      力学系セミナーとトポロジー金曜セミナーの合同開催, 九州大学
    • Related Report
      2022 Research-status Report
  • [Presentation] Flows on surfaces and calculations on the related studie2022

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      トポロジーとコンピュータ 2022, 広島大学
    • Related Report
      2022 Research-status Report
  • [Presentation] Cell complex structure of the space of Hamiltonian vector fields on compact surfaces2022

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      2021年度冬の力学系研究集会
    • Related Report
      2021 Research-status Report
  • [Presentation] Topological invariants of 2D and 3D flows and their applications2021

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      RIMS Workshop, Mathematical methods for the studies of flow, shape, and dynamics
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Topological flow data analysis2021

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      セミナーシリーズ「データ科学と計算科学の融合」
    • Related Report
      2021 Research-status Report
  • [Presentation] On codimension-two-like foliations2021

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      葉層構造論シンポジウム
    • Related Report
      2021 Research-status Report
  • [Presentation] トポロジカルな流れの解析とその応用について2021

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      日本数学会
    • Related Report
      2021 Research-status Report
  • [Presentation] Topological characterizations of 2D gradient flows and 2D Morse-Smale flows and their generic intermediate flows2021

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      Seminar cathedral on Monday, Moscow State University, Moscow, Russia
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] A generalizations of Morse graphs of flows and Reeb graph of surface Hamiltonian flows2021

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      Algebraic Topology: Computation, Methods, and Science(ATMCS) + Applied Algebraic Topology Research Network(AATRN) Talk Series
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Topological fluid data analysis: COT representations of surface flows and their implementations2020

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      Asia Pacific Seminar on Applied Topology and Geometry
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] トポロジカルな流れのデータ解析のための位相不変量2020

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      工学と数学の接点を求めて
    • Related Report
      2020 Research-status Report
  • [Presentation] Hamiltonian flows on punctured surfaces2020

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      2020年度冬の力学系研究集会
    • Related Report
      2020 Research-status Report
  • [Presentation] Generalizations of topological invariants of flows and topological reconstructions of flows from their time-one maps2020

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      京都力学系セミナー
    • Related Report
      2020 Research-status Report
  • [Presentation] Refinement of Morse graphs of flows2020

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      数理科学の諸問題と力学系理論の新展開,
    • Related Report
      2020 Research-status Report
  • [Presentation] Generalizations of Morse graphs of flows2020

    • Author(s)
      Tomoo Yokoyama
    • Organizer
      日本応用数理学会 2020年度 年会
    • Related Report
      2020 Research-status Report
  • [Remarks] ホームページ

    • URL

      http://www.rimath.saitama-u.ac.jp/lab.jp/yokoyama/

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
  • [Remarks] ホームページ

    • URL

      https://www1.gifu-u.ac.jp/~tomoo/

    • Related Report
      2021 Research-status Report
  • [Patent(Industrial Property Rights)] 1.発明の名称:有限型の流れパターンの語表現装置、語表現方法、プログラム、構造物形状の学習方法および構造物設計方法2020

    • Inventor(s)
      横山知郎,坂上貴之
    • Industrial Property Rights Holder
      横山知郎,坂上貴之
    • Industrial Property Rights Type
      特許
    • Filing Date
      2020
    • Related Report
      2021 Research-status Report
    • Overseas

URL: 

Published: 2020-04-28   Modified: 2025-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi