Expanding reverse mathematics with multiple viewpoints
Project/Area Number |
16K17640
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Research Category |
Grant-in-Aid for Young Scientists (B)
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Allocation Type | Multi-year Fund |
Research Field |
Foundations of mathematics/Applied mathematics
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Research Institution | Japan Advanced Institute of Science and Technology |
Principal Investigator |
Yokoyama Keita 北陸先端科学技術大学院大学, 先端科学技術研究科, 講師 (10534430)
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Project Period (FY) |
2016-04-01 – 2020-03-31
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Project Status |
Completed (Fiscal Year 2019)
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Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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Keywords | 数理論理学 / 証明論 / 逆数学 / 算術 / 数学基礎論 / ラムゼイの定理 / 組み合わせ論 / 計算可能性理論 / 計算量理論 / 証明の長さ / 組み合わせ命題 / Ekelandの定理 / クリプキモデル / 指標関数 / 原始再帰的関数 / 組み合わせ理論 / 計算可能性 / 超準モデル |
Outline of Final Research Achievements |
In this project, we investigated the complexity and difficulty of mathematical theorems from the view point of reverse mathematics. Especially, we developed some new techniques to analyze the strength of combinatorial principles such as Ramsey's theorem, and solved a long-standing open problem on the proof-theoretic strength of Ramsey's theorem for pairs. Besides the above, we introduced some arguments to apply the above result and related techniques to the termination analysis, the study of sizes of proofs, found a new phenomenon on the reverse mathematical study of functional analysis, and expanded the field of reverse mathematics with those new points of view.
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Academic Significance and Societal Importance of the Research Achievements |
2次元ラムゼイの定理の証明論的強さにおける長年の問題の解決とそのための手法の導入は逆数学研究におけるマイルストーンとなり、逆数学や証明論分野の国際会議で関連する多くの話題が取り上げられたほか、ウエブジャーナル Quanta Magazine でも取り上げられた。また、上の結果により、2次元ラムゼイの定理の強さがヒルベルトの還元主義プログラムの視点で十分弱いということが解明されたため、この結果の哲学的意味についても議論がなされた。
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Report
(5 results)
Research Products
(50 results)
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[Journal Article] The strength of SCT soundness2018
Author(s)
Emanuele Frittaion, Florian Pelupessy, Silvia Steila and Keita Yokoyama
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Journal Title
Journal of Logic and Computation
Volume: 印刷中
Issue: 6
Pages: 1217-1242
DOI
NAID
Related Report
Peer Reviewed / Int'l Joint Research
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