OSHIMA Toshio

写真a

Title

Director in General

Research Fields, Keywords

Algebraic Analysis

Homepage URL

https://www.ms.u-tokyo.ac.jp/~oshima/index.html

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Graduating School 【 display / non-display 】

  • 1967.04
    -
    1971.06

    The University of Tokyo   Faculty of Science   Graduated

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Graduate School 【 display / non-display 】

  • 1971.07
    -
    1973.03

    The University of Tokyo  Graduate School, Division of Science  Master's Course  Completed

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Campus Career 【 display / non-display 】

  • 2021.04
    -
    Now

    Josai UniversityCenter of Mathematical and Data Sciences   Director in General  

  • 2013.04
    -
    2021.03

    Josai UniversityFaculty of Science   Department of Mathematics   Professor  

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External Career 【 display / non-display 】

  • 2013.06
    　
    　

    The University of Tokyo   Professor Emeritus  

  • 1992.04
    -
    2013.03

    The University of Tokyo   Graduate School of Mathematical Sciences   Professor  

  • 1987.04
    -
    1992.03

    The University of Tokyo   Faculty of Science   Professor  

  • 1983.10
    -
    1987.03

    The University of Tokyo   Faculty of Science   Associate Professor (as old post name)  

  • 1978.09
    -
    1980.05

    Institute for Advances Study, Princeton   Researcher  

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Field of expertise (Grants-in-aid for Scientific Research classification) 【 display / non-display 】

  • Algebraic Analysis

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Papers 【 display / non-display 】

  • Versal unfolding of irregular singularities of a linear differential equation on the Riemann sphere

    Toshio Oshima

    Publ. RIMS Kyoto Uinv. ( 京都大学数理解析研究所 )     [Refereed]  [Invited]

    Single Author

    For a linear ordinary differential equation with unramified irregular singularities we examine a realization of the equation as a confluence of singularities of a Fuchsian differential equation with the same index of rigidity as the original equation. The Fuchsian equation has the singular points as holomorphic parameters.

    DOI

  • A characterization of the monodromy group of Gauss hypergeometric equation

    Toshio Oshima, Kouhei Shimizu

    Josai Mathematical Monographs ( 城西大学 )     [Refereed]

    Single Author

    DOI

  • Confluence and versal unfolding of Pfaffian systems

    Toshio Oshima

    Josai Mathematical Monographs ( 城西大学 )     [Refereed]

    Single Author

    DOI

  • Semilocal monodromy of rigid local systems

    Toshio Oshima

    Formal and Analytic Solutions of Diff. Equations, Springer Proceedings in Mathematics and Statistics      [Refereed]  [Invited]

    Single Author

  • Transformation of KZ type equations

    Toshio Oshima

    Microlocal Analysis and Singular Perterbation Theory, RIMS Kokyuroku Bessatsu      [Refereed]

    Single Author

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Books 【 display / non-display 】

  • MSJ Memoirs 28, Fractional calculus of Weyl algebra and Fuchsian differential equations

    Toshio Oshima (Part： Single Author )

    Mathematical Society of Japan  ISBN: 978-4864970167

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Grant-in-Aid for Scientific Research 【 display / non-display 】

  • Grant-in-Aid for Scientific Research(C)

    Project Year： 2018.04  -  2023.03 

  • Grant-in-Aid for Scientific Research(C)

    Project Year： 2018.04  -  2021.03 

  • Grant-in-Aid for Scientific Research(C)

    Project Year： 2015.04  -  2018.03 

  • Grant-in-Aid for Scientific Research(S)

    Project Year： 2015.04  -  2017.03  Investigator(s): Takashi Tsuboi

  • Grant-in-Aid for Scientific Research(B)

    Project Year： 2013.04  -  2018.03 

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Presentations 【 display / non-display 】

  • Singularities of first order nonlinear partial differential equations and contact geometry

     [Invited]

    Global Study of Differential Equations in the Complex Domain  2013.09  -  2013.09 

  • Some fundamental lemmas for linear ordinary differential equations

     [Invited]

    Global Study of Differential Equations in the Complex Domain  2013.09  -  2013.09 

  • Linear differential equations on the Riemann sphere

    Formal and Analytic Differential, Difference and Discrete Equations  2013.08  -  2013.08 

  • Linear differential equations on the Riemann sphere

    Various Aspects on the Painleve Equations  2012.11  -  2012.11 

  • Linear differential equations on the Riemann sphere and special functions

    Representation Seminar  2012.10  -  2012.10 

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Social Contribution 【 display / non-display 】

  • 2021.08
    　
    　

  • 2020.09
    　
    　

  • 2019.07
    　
    　

  • 2019.07
    　
    　

  • 2018.05
    　
    　

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