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Study on the preserver problem and the problem on gyro structures on Banach algebras

Research Project

Project/Area Number 19K03536
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 12010:Basic analysis-related
Research InstitutionNiigata University

Principal Investigator

HATORI Osamu  新潟大学, 自然科学系, フェロー (70156363)

Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords保存問題 / 等距離写像 / GGV / C*環の正凸錐 / Tingley問題 / バナッハ環 / ジャイロ構造 / Tingley 問題
Outline of Research at the Start

連続関数全体,連続的微分可能関数全体,解析関数からなる空間,あるいはLipschitz関数からなるバナッハ環など各種の関数空間やバナッハ環,またはヒルベルト空間やバナッハ空間上の有界線形作用素からなるバナッハ環やその部分構造における各種写像と特に等距離写像の研究を行う。さらにこれらの空間上の全射等距離写像全体からなる群の大域的な構造がlocal actionによりどのように記述できるかを,このような群のlocal回帰性,2-local回帰性などを調べることを通して研究を行う。さらにジャイロ構造ほか他の各種構造とその関係について保存問題を通した研究を行う。

Outline of Final Research Achievements

The Tingley problem is one of the important challenges in the study of the preserver problem, and through this research, several new results have been obtained. We introduced the concept of the complex Mazur-Ulam property and proved that function algebras including the disk algebra have this property, which was subsequently announced. Furthermore, we demonstrated that Banach spaces satisfying certain separation conditions also possess this property. It is known that the convex cone of a unital C*-algebra is a generalized gyrovector space (GGV), a concept introduced by the representative of this study and the other. New insights into mappings on convex cones were also obtained and published. We completed the necessary modified proofs concerning the Mazur-Ulam theorem on GGVs.

Academic Significance and Societal Importance of the Research Achievements

保存問題において等距離写像については多くの数学者により研究が進められている。その中でTingley問題に関して新たな知見を得られたことは大きな成果である。その中である種の分離条件に着目する方法はこの分野に新しい方法を提示しその意味で学術的な意義がある。GGVの重要な例である単位的C*環の正凸錐上の乗法的にスペクトルあるいはノルム等を保存する写像についてのMolnarの問いに肯定的に答えることができたことは、この方面に新たな研究の方向性を見出した点においても学術的意義が認められる。また、GGV上のgyrometric保存写像に関する定理の証明を改善することができた点も評価できる。

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

    (27 results)

All 2024 2023 2022 2021 2020 2019

All Journal Article (9 results) (of which Peer Reviewed: 7 results,  Open Access: 2 results) Presentation (18 results) (of which Int'l Joint Research: 3 results,  Invited: 7 results)

  • [Journal Article] Non-linear characterization of Jordan *-isomorphisms via maps on positive cones of C*-algebras2024

    • Author(s)
      Osamu Hatori and Shiho Oi
    • Journal Title

      Acta Scientiarum Mathematicarum

      Volume: - Issue: 1-2 Pages: 313-336

    • DOI

      10.1007/s44146-024-00140-y

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The Mazur-Ulam property for a Banach space which satisfies a separation condition2023

    • Author(s)
      Osamu Hatori
    • Journal Title

      数理解析研究所講究録別冊

      Volume: B93 Pages: 2982-2982

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] The Mazur-Ulam property for uniform algebras2022

    • Author(s)
      Osamu Hatori
    • Journal Title

      Studia Mathematica 265 (2022), 227-239

      Volume: 265 Issue: 2 Pages: 227-239

    • DOI

      10.4064/sm210703-11-9

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Tingley's problems on uniform algebras2021

    • Author(s)
      Hatori Osamu、Oi Shiho、Shindo Togashi Rumi
    • Journal Title

      Journal of Mathematical Analysis and Applications

      Volume: 503 Issue: 2 Pages: 125346-125346

    • DOI

      10.1016/j.jmaa.2021.125346

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] A Gyrogeometric Mean in the Einstein Gyrogroup2020

    • Author(s)
      Takuro Honma and Osamu Hatori
    • Journal Title

      Symmetry2020

      Volume: 12(8) Issue: 8 Pages: 1333-1333

    • DOI

      10.3390/sym12081333

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Note on the proof of the existence of D(p) of a theorem of Jarosz2019

    • Author(s)
      Osamu Hatori and Kyohei Tanabe
    • Journal Title

      Nihonkai Math. J.

      Volume: 30

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] 2-local isometries on function spaces2019

    • Author(s)
      Osamu Hatori and Shiho Oi
    • Journal Title

      Contemp. Math.

      Volume: 737 Pages: 89-106

    • DOI

      10.1090/conm/737/14860

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Isometries on Banach algebras of C(Y)-valued maps2019

    • Author(s)
      Osamu Hatori
    • Journal Title

      京都大学数理解析研究所講究録

      Volume: 2118

    • Related Report
      2019 Research-status Report
  • [Journal Article] 2-local isometries on spaces of continuous functions2019

    • Author(s)
      Osamu Hatori
    • Journal Title

      京都大学数理解析研究所講究録

      Volume: 2125

    • Related Report
      2019 Research-status Report
  • [Presentation] A Mazur-Ulam theorem on a GGV and its application2024

    • Author(s)
      羽鳥 理 阿部 敏一
    • Organizer
      日本数学会2024年度年会
    • Related Report
      2023 Annual Research Report
  • [Presentation] The Mazur-Ulam property for Banach spaces with a certain separation condition2023

    • Author(s)
      Osamu Hatori
    • Organizer
      6th Niigata Seminar
    • Related Report
      2023 Annual Research Report
  • [Presentation] The Mazur-Ulam property for spaces of harmonic functions2023

    • Author(s)
      羽鳥 理
    • Organizer
      日本数学会2023年度秋期総合分科会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Tingley's problem on function spaces2023

    • Author(s)
      Osamu Hatori
    • Organizer
      京都大学数理解析研究所 共同研究(公開型)Research on Real, Complex and Functional Analysis from the perspective of function spaces
    • Related Report
      2023 Annual Research Report
  • [Presentation] 関数環と鶴のおんがえし2023

    • Author(s)
      羽鳥 理
    • Organizer
      関数環研究集会
    • Related Report
      2023 Annual Research Report
  • [Presentation] The Mazur-Ulam property for spaces of continuous functions2022

    • Author(s)
      Osamu Hatori
    • Organizer
      International conference on Banach algebras and related topics
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] The Mazur-Ulam property for some Banach spaces2022

    • Author(s)
      Osamu Hatori
    • Organizer
      Operator theory workshop, Memphis University
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] The complex Mazur-Ulam property for C-regular spaces2022

    • Author(s)
      羽鳥 理
    • Organizer
      日本数学会秋期総合分科会
    • Related Report
      2022 Research-status Report
  • [Presentation] GG V revisited2022

    • Author(s)
      羽鳥 理
    • Organizer
      関数環研究集会
    • Related Report
      2022 Research-status Report
  • [Presentation] ときどきみかけるこんな証明2022

    • Author(s)
      羽鳥 理
    • Organizer
      第8回山陰基礎論と数学およびその周辺の研究集会
    • Related Report
      2022 Research-status Report
  • [Presentation] The Mazur-Ulam peoperty for uniform algebras2021

    • Author(s)
      Osamu Hatori
    • Organizer
      Research on preserver problems on Banach algebras and related topics (RIMS Symposia (Open))
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] When does an isometry on a Banach algebra preserve the multiplicative structure?2020

    • Author(s)
      Osamu Hatori
    • Organizer
      Preserver Webinar
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] バナッハ環上の等距離写像2020

    • Author(s)
      羽鳥 理
    • Organizer
      日本数学会秋季総合分科会 企画特別講演
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] 関数上のTingley問題2020

    • Author(s)
      羽鳥 理
    • Organizer
      2020年度関数環研究集会
    • Related Report
      2020 Research-status Report
  • [Presentation] When is a linear map Jordan?2020

    • Author(s)
      羽鳥 理
    • Organizer
      RIMS共同研究(公開型)様々な関数空間上の等距離写像
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] 2-local surjective isometries on some spaces of continuous functions2019

    • Author(s)
      羽鳥 理 大井 志穂
    • Organizer
      日本数学会2019年度年会
    • Related Report
      2019 Research-status Report
  • [Presentation] バナッハ環上の等距離写像について2019

    • Author(s)
      羽鳥 理
    • Organizer
      RIMS共同研究(公開型)一般位相幾何学の発展と諸分野との連携
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Banach algebra isometries revisited2019

    • Author(s)
      Osamu Hatori
    • Organizer
      Conference on Function Algebras 2019
    • Related Report
      2019 Research-status Report

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

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