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Research of formal provability by means of the investigation of incompleteness theorems

Research Project

Project/Area Number 19K14586
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 12030:Basic mathematics-related
Research InstitutionKobe University (2020-2023)
Kisarazu National College of Technology (2019)

Principal Investigator

Kurahashi Taishi  神戸大学, システム情報学研究科, 准教授 (10738446)

Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords数学基礎論 / 数理論理学 / 不完全性定理 / 様相論理 / 証明可能性論理 / 形式的算術 / 算術のモデル / 形式的証明可能性 / 証明可能性 / 証明可能性述語 / 部分的な保存性 / クリプキ意味論 / 決定不可能命題
Outline of Research at the Start

本研究は,第一不完全性定理,第二不完全性定理にそれぞれ対応する,(1) 形式的体系における決定不可能な文,(2) 形式的体系の証明可能性を表す論理式(証明可能性述語),という二つの対象の構造や性質の分析を主軸におき,形式的証明および形式的証明可能性の構造及び性質を解明することを試みるものである.
(1)様々な決定不可能な命題の振る舞いを分析することによって,理論の証明可能性の構造のもつ性質を明らかにすることを目指す.
(2) 理論の証明可能性が持つ性質のうち本質的なものは何か,そして証明可能性述語が本質的に満たすべき性質とは何かを分析することで,「数学的証明とは何か」という問いの技術的理解を行う.

Outline of Final Research Achievements

The notion of provability in formal systems is studied through the analysis of various aspects of the incompleteness theorems. The main purpose of this research is to explore the essence of the nature of the notion of formalized provability, and to understand its structure. By studying the first incompleteness theorem, the second incompleteness theorem, provability predicates through modal logic, and basic properties of modal arithmetic and semi-classical arithmetic, I could derive several results about the situation surrounding the incompleteness theorems.

Academic Significance and Societal Importance of the Research Achievements

不完全性定理の周辺に関する分析を行うことで形式的証明の構造を理解するという研究は,これまでにも様々な角度から行われている.こうした先行研究を踏まえながらも,独自の視点を常に持ち,内容的にも,また技術的にもそれなりに意義のある研究成果を得ることができたと感じている.本研究により,形式的証明可能性の概念の理解に向けた,いくつかの本質的な前進ができたといえる.

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

    (55 results)

All 2024 2023 2022 2021 2020 2019 Other

All Int'l Joint Research (3 results) Journal Article (23 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 22 results,  Open Access: 3 results) Presentation (29 results) (of which Int'l Joint Research: 3 results,  Invited: 4 results)

  • [Int'l Joint Research] ユトレヒト大学(オランダ)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] ユトレヒト大学(オランダ)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] ユトレヒト大学(オランダ)

    • Related Report
      2021 Research-status Report
  • [Journal Article] On the conservation results for local reflection principles2024

    • Author(s)
      Kogure Haruka、Kurahashi Taishi
    • Journal Title

      Journal of Logic and Computation

      Volume: - Issue: 2

    • DOI

      10.1093/logcom/exad076

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The fixed point and the Craig interpolation properties for sublogics of $$\textbf{IL}$$2023

    • Author(s)
      Iwata Sohei、Kurahashi Taishi、Okawa Yuya
    • Journal Title

      Archive for Mathematical Logic

      Volume: 63 Issue: 1-2 Pages: 1-37

    • DOI

      10.1007/s00153-023-00882-6

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Prenex normalization and the hierarchical classification of formulas2023

    • Author(s)
      Fujiwara Makoto、Kurahashi Taishi
    • Journal Title

      Archive for Mathematical Logic

      Volume: 63 Issue: 3-4 Pages: 391-403

    • DOI

      10.1007/s00153-023-00899-x

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The provability logic of all provability predicates2023

    • Author(s)
      Kurahashi Taishi
    • Journal Title

      Journal of Logic and Computation

      Volume: - Issue: 6 Pages: 1108-1135

    • DOI

      10.1093/logcom/exad060

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The persistence principle over weak interpretability logic2023

    • Author(s)
      Iwata Sohei、Kurahashi Taishi、Okawa Yuya
    • Journal Title

      Mathematical Logic Quarterly

      Volume: - Issue: 1 Pages: 37-63

    • DOI

      10.1002/malq.202200020

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Some observations on the FGH theorem2023

    • Author(s)
      Taishi Kurahashi
    • Journal Title

      Studia Logica

      Volume: - Issue: 5 Pages: 1-30

    • DOI

      10.1007/s11225-023-10045-6

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Arithmetical completeness theorems for monotonic modal logics2023

    • Author(s)
      Haruka Kogure Haruka and Taishi Kurahashi
    • Journal Title

      Annals of Pure and Applied Logic

      Volume: 174 Issue: 7 Pages: 103271-103271

    • DOI

      10.1016/j.apal.2023.103271

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Refining the arithmetical hierarchy of classical principles2022

    • Author(s)
      Makoto Fujiwara and Taishi Kurahashi
    • Journal Title

      Mathematical Logic Quarterly

      Volume: 68 Issue: 3 Pages: 318-345

    • DOI

      10.1002/malq.202000077

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] DISJUNCTION AND EXISTENCE PROPERTIES IN MODAL ARITHMETIC2022

    • Author(s)
      Taishi Kurahashi and Motoki Okuda
    • Journal Title

      The Review of Symbolic Logic

      Volume: - Issue: 1 Pages: 1-28

    • DOI

      10.1017/s1755020322000363

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] 証明可能性述語の様相論理2022

    • Author(s)
      倉橋太志
    • Journal Title

      京都大学数理解析研究所講究録

      Volume: 2233 Pages: 1-18

    • Related Report
      2022 Research-status Report
    • Open Access
  • [Journal Article] On inclusions between quantified provability logics2022

    • Author(s)
      Taishi Kurahashi
    • Journal Title

      Studia Logica

      Volume: 110 Issue: 1 Pages: 165-188

    • DOI

      10.1007/s11225-021-09957-y

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effectively constructible fixed points in Sacchetti's modal logics of provability2022

    • Author(s)
      Taishi Kurahashi and Yuya Okawa
    • Journal Title

      Notre Dame Journal of Formal Logic

      Volume: 63 Issue: 1

    • DOI

      10.1215/00294527-2022-0003

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] On Guaspari's problem about partially conservative sentences2022

    • Author(s)
      Taishi Kurahashi, Yuya Okawa, V. Yu. Shavrukov and Albert Visser
    • Journal Title

      Annals of Pure and Applied Logic

      Volume: 173 Issue: 5 Pages: 103087-103087

    • DOI

      10.1016/j.apal.2022.103087

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Conservation theorems on semi-classical arithmetic2022

    • Author(s)
      Makoto Fujiwara and Taishi Kurahashi
    • Journal Title

      The Journal of Symbolic Logic

      Volume: To appear Issue: 4 Pages: 1469-1496

    • DOI

      10.1017/jsl.2022.25

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Prenex normal form theorems in semi-classical arithmetic2021

    • Author(s)
      Makoto Fujiwara and Taishi Kurahashi
    • Journal Title

      The Journal of Symbolic Logic

      Volume: 86 Issue: 3 Pages: 1124-1153

    • DOI

      10.1017/jsl.2021.47

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Topological semantics of conservativity and interpretability logics2021

    • Author(s)
      Sohei Iwata and Taishi Kurahashi
    • Journal Title

      Journal of Logic and Computation

      Volume: 31 Issue: 7 Pages: 1716-1739

    • DOI

      10.1093/logcom/exab046

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Modal completeness of sublogics of the interpretability logic IL2021

    • Author(s)
      Taishi Kurahashi and Yuya Okawa
    • Journal Title

      Mathematical Logic Quarterly

      Volume: -

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] 不完全性定理の数学的発展2021

    • Author(s)
      倉橋太志
    • Journal Title

      数学

      Volume: 73 Pages: 60-87

    • NAID

      40022471614

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] A note on derivability conditions2020

    • Author(s)
      Taishi Kurahashi
    • Journal Title

      The Journal of Symbolic Logic

      Volume: 85 Issue: 3 Pages: 1224-1253

    • DOI

      10.1017/jsl.2020.33

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Uniform Lyndon interpolation property in propositional modal logics2020

    • Author(s)
      Taishi Kurahashi
    • Journal Title

      Archive for Mathematical Logic

      Volume: - Issue: 5-6 Pages: 659-678

    • DOI

      10.1007/s00153-020-00713-y

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Rosser provability and the second incompleteness theorem2019

    • Author(s)
      Taishi Kurahashi
    • Journal Title

      Symposium on Advances in Mathematical Logic 2018 proceedings

      Volume: -

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Rosser provability and normal modal logics2019

    • Author(s)
      Taishi Kurahashi
    • Journal Title

      Studia Logica

      Volume: - Issue: 3 Pages: 597-617

    • DOI

      10.1007/s11225-019-09865-2

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Fixed-point properties for predicate modal logics2019

    • Author(s)
      Sohei Iwata and Taishi Kurahashi
    • Journal Title

      Annals of the Japan Association for Philosophy of Science

      Volume: -

    • NAID

      130007940567

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] 証明可能性-強制様相論理 PF について2024

    • Author(s)
      倉橋太志、高瀬理人
    • Organizer
      第58回MLG数理論理学研究集会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 必然化の論理 N の拡張論理の有限フレーム性と補間定理2024

    • Author(s)
      佐藤雄太、倉橋太志
    • Organizer
      第58回MLG数理論理学研究集会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 証明可能性論理 GR の補間定理2024

    • Author(s)
      小暮晏佳、倉橋太志
    • Organizer
      第58回MLG数理論理学研究集会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 局所反映原理に関する保存性について2024

    • Author(s)
      小暮晏佳、倉橋太志
    • Organizer
      日本数学会 2024年度年会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 必然化の論理 N の拡張論理の有限フレーム性2024

    • Author(s)
      佐藤雄太、倉橋太志
    • Organizer
      日本数学会 2024年度年会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 証明可能性-強制様相論理2024

    • Author(s)
      高瀬理人、倉橋太志
    • Organizer
      日本数学会 2024年度年会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 理論の不完全性,決定不能性,分離不能性2024

    • Author(s)
      倉橋太志、Albert Visser
    • Organizer
      日本数学会 2024年度年会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 証明可能性論理 D のカット無しシークエント計算2023

    • Author(s)
      鹿島亮、倉橋太志、岩田荘平
    • Organizer
      日本数学会 2023年度秋季総合分科会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 局所反映原理における保存性2023

    • Author(s)
      小暮晏佳、倉橋太志
    • Organizer
      証明論研究集会2023 証明論と計算論の最前線
    • Related Report
      2023 Annual Research Report
  • [Presentation] 理論の不完全性,決定不能性,分離不能性2023

    • Author(s)
      倉橋太志
    • Organizer
      第2回 ロジック・ウィンタースクール
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Friedman--Goldfarb--Harrington の定理の拡張2023

    • Author(s)
      倉橋太志
    • Organizer
      日本数学会 2023年度年会
    • Related Report
      2022 Research-status Report
  • [Presentation] 単調性を満たす証明可能性述語の様相論理2023

    • Author(s)
      倉橋太志・小暮晏佳
    • Organizer
      日本数学会 2023年度年会
    • Related Report
      2022 Research-status Report
  • [Presentation] 様相論理 IL-(P) について2023

    • Author(s)
      岩田荘平・大川裕矢・倉橋太志
    • Organizer
      日本数学会 2023年度年会
    • Related Report
      2022 Research-status Report
  • [Presentation] 証明可能性述語の様相論理2022

    • Author(s)
      倉橋太志
    • Organizer
      SAML2022: Symposium on Advances in Mathematical Logic 2022
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] R と無矛盾な理論の不完全性と決定不可能性2022

    • Author(s)
      倉橋太志
    • Organizer
      証明論シンポジウム 2022
    • Related Report
      2022 Research-status Report
  • [Presentation] 保存性の論理 CL およびその拡大の位相的意味論について2021

    • Author(s)
      岩田荘平・倉橋太志
    • Organizer
      日本数学会 2021年度秋季総合分科会
    • Related Report
      2021 Research-status Report
  • [Presentation] 様相算術における選言特性と存在特性2021

    • Author(s)
      倉橋太志
    • Organizer
      日本数学会 2021年度秋季総合分科会
    • Related Report
      2021 Research-status Report
  • [Presentation] 述語証明可能性論理の包含関係について2021

    • Author(s)
      倉橋太志
    • Organizer
      日本数学会 2021年度秋季総合分科会
    • Related Report
      2021 Research-status Report
  • [Presentation] On the second incompleteness theorem and provability predicates2021

    • Author(s)
      倉橋太志
    • Organizer
      Celebrating 90 Years of Godel’s Incompleteness Theorems
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Inclusions between quantified provability logics2021

    • Author(s)
      倉橋太志
    • Organizer
      International Workshop on Godel's Incompleteness Theorems
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 解釈可能性論理 IL の部分論理に対する Craig の補間定理及び不動点定理について2021

    • Author(s)
      大川裕矢, 倉橋太志, 岩田荘平
    • Organizer
      日本数学会2021年度年会
    • Related Report
      2020 Research-status Report
  • [Presentation] 部分保存的な文に対する Bennet の結果の一般化2020

    • Author(s)
      大川裕矢, 倉橋太志
    • Organizer
      日本数学会2020年度秋季総合分科会
    • Related Report
      2020 Research-status Report
  • [Presentation] 解釈可能性論理ILの部分論理2020

    • Author(s)
      倉橋太志, 大川裕矢
    • Organizer
      日本数学会2020年度秋季総合分科会
    • Related Report
      2020 Research-status Report
  • [Presentation] 述語証明可能性論理の包含関係について2020

    • Author(s)
      倉橋太志
    • Organizer
      証明論研究集会2020
    • Related Report
      2020 Research-status Report
  • [Presentation] Derivability conditions and the second incompleteness theorem2019

    • Author(s)
      Taishi Kurahashi
    • Organizer
      Logic Colloquium 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 述語様相論理における不動点の性質について2019

    • Author(s)
      岩田荘平・倉橋太志
    • Organizer
      日本数学会 2019年度秋季総合分科会
    • Related Report
      2019 Research-status Report
  • [Presentation] 部分保存的な文に関する Guaspari の問題について2019

    • Author(s)
      大川裕矢・倉橋太志
    • Organizer
      日本数学会 2019年度秋季総合分科会
    • Related Report
      2019 Research-status Report
  • [Presentation] 第二不完全性定理について2019

    • Author(s)
      倉橋太志
    • Organizer
      日本数学会 2019年度秋季総合分科会
    • Related Report
      2019 Research-status Report
  • [Presentation] ゲーデルの第二不完全性定理について2019

    • Author(s)
      倉橋太志
    • Organizer
      科学基礎論学会2019年度研究例会
    • Related Report
      2019 Research-status Report

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

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