Updated on 2026/05/29

写真a

 
KODAMA Yuya
 
Organization
Research Field in Science, Science and Engineering Area Graduate School of Science and Engineering (Science) Department of Informatics Informatics Program Assistant Professor
Title
Assistant Professor

Research Interests

  • 幾何学的群論

Research Areas

Geometry

Education

  • 2021.4 - 2024.3    Tokyo Metropolitan University

  • 2019.4 - 2021.3    Tokyo Metropolitan University

Research History

  • 2024.4    Kagoshima University   Assistant Professor

 

Papers

  • Kohei Iwamoto, Ryoya Kai, Yuya Kodama .  Metrics For Quandles .  International Journal of Mathematics   2026.5Reviewed

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:World Scientific Pub Co Pte Ltd  

    A quandle is an algebraic system originating in knot theory, which can be regarded as a generalization of the operation of conjugation of groups. This structure naturally defines two subgroups of its automorphism group, which are called the inner automorphism group and the displacement group, and they act on the quandle from the right. For a quandle with such groups being finitely generated, we investigate the graph structures induced from the actions, and the corresponding metric spaces. The graph structures are defined by the notion of the Schreier graph, which is a natural generalization of the Cayley graph for a group. In particular, the metric associated with the displacement group of an important class of quandles, namely, generalized Alexander quandles, had been studied in detail. We show that this metric space is quasi-isometric to the displacement group equipped with a word metric. Finally, we provide some examples that are quasi-isometric to typical metric spaces.

    DOI: 10.1142/s0129167x26500539

  • Yuya KODAMA, Akihiro TAKANO .  Virtual Thompson's group .  Journal of the Mathematical Society of Japan77 ( 1 ) 301 - 323   2025.1Reviewed

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Mathematical Society of Japan (Project Euclid)  

    DOI: 10.2969/jmsj/91339133

  • Yuya Kodama, Akihiro Takano .  Alexander's theorem for stabilizer subgroups of Thompson's group .  Topology and its Applications   109576 - 109576   2025Reviewed

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.topol.2025.109576

  • Yuya Kodama .  Divergence functions of higher-dimensional Thompson’s groups .  Pacific Journal of Mathematics333 ( 2 ) 309 - 329   2024.12Reviewed

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    Publishing type:Research paper (scientific journal)   Publisher:Mathematical Sciences Publishers  

    DOI: 10.2140/pjm.2024.333.309

  • Yuya Kodama, Akihiro Takano .  The $p$-colorable subgroup of Thompson’s group .  Groups, Geometry, and Dynamics   2024.10Reviewed

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.4171/ggd/841

  • Yuya Kodama, Akihiro Takano .  The 3-colorable subgroup of Thompson's group and tricolorability of links .  Journal of Algebra634   336 - 344   2023.11Reviewed

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.jalgebra.2023.07.014

  • Yuya Kodama .  An <i>n</i>-adic generalization of the Lodha–Moore group .  Communications in Algebra51 ( 12 ) 4997 - 5018   2023.6Reviewed

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    Publishing type:Research paper (scientific journal)   Publisher:Taylor & Francis  

    DOI: 10.1080/00927872.2023.2223716

  • Yuya Kodama .  Divergence function of the braided Thompson group .  Kyoto Journal of Mathematics63 ( 2 )   2023.5Reviewed

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    Publishing type:Research paper (scientific journal)   Publisher:Duke University Press  

    DOI: 10.1215/21562261-10428532

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Research Projects

  • Thompson群Fの非正曲率性

    Grant number:26K16986  2026.4 - 2030.3

    日本学術振興会  科学研究費助成事業  若手研究

    兒玉 悠弥

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    Grant amount:\4420000 ( Direct Cost: \3400000 、 Indirect Cost:\1020000 )

  • 結び目の不変量を用いたThompson群Fの部分群の擬等長類の研究

    Grant number:24K22836  2024.7 - 2026.3

    日本学術振興会  科学研究費助成事業  研究活動スタート支援

    兒玉 悠弥

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    Grant amount:\2860000 ( Direct Cost: \2200000 、 Indirect Cost:\660000 )