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New Developments in the Philosophy of Formalism: Through the Elucidation of Gaisi Takeuti's Logical Philosophy

Research Project

Project/Area Number 19K00022
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 01010:Philosophy and ethics-related
Research InstitutionWaseda University

Principal Investigator

Akiyoshi Ryota  早稲田大学, 高等研究所, その他(招聘研究員) (20587852)

Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords数学の哲学 / 論理学 / 証明論 / 京都学派 / 西田幾多郎 / 自己 / デジタルツイン / 志向性 / フッサール / 哲学 / 形式主義 / 証明論的意味論
Outline of Research at the Start

本研究は,戦後に活躍した論理学者の竹内外史の論理哲学を学際的・国際的なアプローチで解明することで,形式主義の新たな展開を切り開くことを目指す.特に,竹内外史の哲学的基盤(とりわけ無矛盾性プログラムの基盤である有限の立場)を,その論理学的内容の正確な理解や分析を伴いつつ,ヒルベルトの有限の立場との比較検討を通じて,竹内が独自のプログラムを構想していたことを明らかにする.そして,この論理学的プログラムを,竹内が言及している西田幾多郎などの「京都学派の哲学」の観点からも吟味したい.必要に応じて国際共同研究を行うことで,日本から世界に「証明に関する数理哲学」を発信することを目指す.

Outline of Final Research Achievements

The purpose of this study is to shed light on and elucidate new aspects of formalism by approaching Gaisi Takeuti's logical philosophy, the greatest postwar logician produced in Japan. Until now, Takeuti has been treated exclusively as a mathematician, but this study has revealed the connection with the Kyoto School philosophy represented by Nishida Kitaro. In addition, a mathematical result was obtained by reconstructing Takeuti's proof of the well-foundedness of ordinal numbers. Relatedly, we were able to advance a comparative study with Feferman, who represents the postwar proof theory in the West. As an unexpected byproduct, we were also able to advance research on the application of the philosophy of the self in Eastern philosophy to the philosophy and logic of the digital twin.

Academic Significance and Societal Importance of the Research Achievements

本研究によって、戦後最大の論理学者である竹内外史の論理哲学と西田幾多郎に代表される京都学派の哲学の繋がりが明らかになってきたことで、形式主義の新たな側面に光を当てることができた。これは、数学・論理学の哲学の新たな方向性を指ししており、西洋哲学と東洋哲学の新たな接点を提供する意義ももっている。また、デジタルツインの研究は、東洋的な自己観の応用哲学へのさらなる適用可能性を意味している。

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

    (22 results)

All 2024 2023 2022 2021 2020 2019 Other

All Int'l Joint Research (6 results) Journal Article (7 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 5 results,  Open Access: 5 results) Presentation (8 results) (of which Int'l Joint Research: 8 results,  Invited: 6 results) Remarks (1 results)

  • [Int'l Joint Research] ロレーヌ大学/パリ第一大学/科学史科学哲学研究所(IHPST)(フランス)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] パリ第一大学/ロレーヌ大学(フランス)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] ロレーヌ大学/パリ第一大学(フランス)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] パリ第一大学/科学史科学哲学研究所(IHPST)/ロレーヌ大学(フランス)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] パリ第一大学哲学科/科学史科学哲学研究所(IHPST)(フランス)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] ミュンヘン大学数学科(ドイツ)

    • Related Report
      2019 Research-status Report
  • [Journal Article] A Note on Feferman and Takeuti: Their Thoughts on Predicativity and Finitism2024

    • Author(s)
      Ryota Akiyoshi
    • Journal Title

      哲學(三田哲学会)

      Volume: 153 Pages: 1-27

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Foundations of Mathematics a la Kyoto School: from Nishida to Takeuti via Suetsuna2023

    • Author(s)
      Ryota Akiyoshi
    • Journal Title

      哲學(三田哲学会)

      Volume: 151

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Logic of Alternative-I2022

    • Author(s)
      Yasuo Deguchi, Takuro Onishi, Ryota Akiyoshi, Takashi Yagisawa, Maiko Yamamori
    • Journal Title

      Asian Journal of Philosophy

      Volume: 1 Issue: 2 Pages: 1-16

    • DOI

      10.1007/s44204-022-00050-2

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] 竹内の整礎性証明再訪2021

    • Author(s)
      Ryota Akiyoshi and Andrew Arana
    • Journal Title

      哲學(三田哲学会)

      Volume: 146

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] On Gaisi Takeuti's Philosophy of Mathematics (abstract)2020

    • Author(s)
      Ryota Akiyoshi and Andrew Arana
    • Journal Title

      The Bulletin of Symbolic Logic

      Volume: -

    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Journal Article] Takeuti’s proof-theory in the context of the Kyoto school2019

    • Author(s)
      Ryota Akiyoshi and Andrew Arana
    • Journal Title

      哲学論叢

      Volume: 46

    • NAID

      120006731562

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Proofs as Programs" Revisited” (abstract)2019

    • Author(s)
      Ryota Akiyoshi
    • Journal Title

      The Bulletin of Symbolic Logic

      Volume: 25

    • Related Report
      2019 Research-status Report
  • [Presentation] Towards Proof-Theoretic Semantics for Second-Order Logic2023

    • Author(s)
      Ryota Akiyoshi
    • Organizer
      Mini-WS (L'Institut d'histoire et de philosophie des sciences et des techniques, Paris)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Takeuti on finite and infinite sets2023

    • Author(s)
      Ryota Akiyoshi, Andrew Arana
    • Organizer
      Workshop: “Self and Infinity” (Husserl Archive)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Takeuti’s finitism in the context of the Kyoto school2020

    • Author(s)
      Ryota Akiyoshi
    • Organizer
      Axiomes et definitions (Paris, IHPST)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Takeuti’s argument of the well-foundedness of ordinals up to the epsilon_02020

    • Author(s)
      Ryota Akiyoshi
    • Organizer
      Munich Center for Mathematical Philosophy
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Takeuti’s finitism in the context of the Kyoto school2020

    • Author(s)
      Ryota Akiyoshi
    • Organizer
      Munich Center for Mathematical Philosophy
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Takeuti’s Finitism Revisited2020

    • Author(s)
      Ryota Akiyoshi
    • Organizer
      Mathematical and logical understanding and formalization ―Workshop in honor of Pr. Mitsuhiro Okada― (Paris, IHPST)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On Gaisi Takeuti's philosophy of mathematics2019

    • Author(s)
      Ryota Akiyoshi
    • Organizer
      Logic Colloquium 2019 (Prague, The Czech Republic)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] On Gaisi Takeuti's philosophy of mathematics2019

    • Author(s)
      Ryota Akiyoshi
    • Organizer
      Oberseminar Mathematische Logik (LMU Muenchen, Mathematisces Institut)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Remarks]

    • URL

      https://researchmap.jp/georg_logic

    • Related Report
      2019 Research-status Report

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

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