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The study of algebraic topology by the combinatorial method

Research Project

Project/Area Number 16K05150
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Geometry
Research InstitutionKochi University

Principal Investigator

Hemmi Yutaka  高知大学, その他部局等(名誉教授), 名誉教授 (70181477)

Co-Investigator(Kenkyū-buntansha) 山口 俊博  高知大学, 教育研究部自然科学系理工学部門, 教授 (90346700)
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords有限位相空間 / 順序複体 / 有限位相空間の圏の拡張 / ホモトピー / 強ホモトピー / ホモトピー関手 / 極小有限空間 / 有限位相空間のホモトピー群 / 有限位相空間のループ空間 / 極小有限位相空間 / 幾何学 / ホモトピー論 / 組合せ論 / グラフ理論
Outline of Final Research Achievements

The results are following: (1) Natural definition of homotopy between maps preserving comparable pairs (CP-maps) of finite T_0-spaces considered as posets, (2) by this definition of homotopy, the homotopy theory of the extended category Ftopex of finite T_0-spaces and the homotopy theory of the category of simplicial complexes by strong homotopy corespond via the functor defined by the order complex, (3) the minimal complexes have good properties in the category Ftopex, (4) any homotopy invariant functor defined in the usual category of topological spaces can be extended on the extended category Ftopex, and (5) a definition of the homotopy groups on the category of Ftopex and the fact that the CP-maps induce homomorphisms on the homotopy groups.

Academic Significance and Societal Importance of the Research Achievements

有限T_0空間と有限posetを同一視したとき,poset間の比較可能対を比較可能対に写す写像に対応する有限T_0空間に自然にhomotopyが定義され,それにより,拡張された有限T_0空間の圏から単体複体の圏への順序複体関手が定義されるが,それがホモトピー圏の充満かつ忠実な関手になることが分かっており,この対応を用いたホモトピー論的研究は興味深い.今回得られた結果により,通常の連続写像を射とした有限T_0空間の圏で行える様々な議論が,この拡張された圏でも可能になり,それにより単体複体の組合せ論に新たな手段が開ける可能性を与えるものである.

Report

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

    (6 results)

All 2019 2018 2016

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Open Access: 1 results,  Acknowledgement Compliant: 1 results) Presentation (1 results)

  • [Journal Article] Poset-stratified space structures of homotopy sets2019

    • Author(s)
      T. Yamaguchi and S. Yokura
    • Journal Title

      Homology, Homotopy and Applications

      Volume: 21 Issue: 2 Pages: 1-22

    • DOI

      10.4310/hha.2019.v21.n2.a1

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Self-maps of spaces in fibrations2018

    • Author(s)
      N. Oda and T. Yamaguchi
    • Journal Title

      Homology, homotopy and applications

      Volume: 20 Issue: 2 Pages: 289-313

    • DOI

      10.4310/hha.2018.v20.n2.a15

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Review on higher homotopies in the theory of $H$-spaces2018

    • Author(s)
      Yutaka HEMMI
    • Journal Title

      Math. J. Okayama Univ.

      Volume: 60 Pages: 1-36

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Stable extendibility of some complex vector bundles over lens spaces and Schwarzenberger's theorem2016

    • Author(s)
      Yutaka Hemmi and Teiichi Kobayashi
    • Journal Title

      Hiroshima Mathematical Journal

      Volume: 46 Pages: 333-341

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Mod $p$ decomposition of $H$-spaces of low rank2016

    • Author(s)
      Yutaka Hemmi and Hirokazu Nishinobu
    • Journal Title

      Publ. RIMS

      Volume: 52 Issue: 2 Pages: 207-221

    • DOI

      10.4171/prims/178

    • Related Report
      2016 Research-status Report
    • Peer Reviewed
  • [Presentation] On self-closeness numbers2019

    • Author(s)
      山口俊博
    • Organizer
      福岡ホモトピー論セミナー
    • Related Report
      2018 Annual Research Report

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Published: 2016-04-21   Modified: 2020-03-30  

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