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On generalized Lens equations and geometry of mixed singularities

Research Project

Project/Area Number 16K05108
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Algebra
Research InstitutionTokyo University of Science

Principal Investigator

Oka Mutsuo  東京理科大学, 理学部第一部数学科, 教授 (40011697)

Research Collaborator Eyral Christophe  
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Keywords一般レンズ方程式 / 混合斉次多項式 / ミルナー束 / 基本群 / 混合擬斉次多項式 / ミルナー束の連結性 / 補空間の基本群 / レンズ方程式 / モジュライ空間 / 根の個数 / 巡回型混合多項式 / Lojasiewicz 不等式 / 利便多項式 / 一般化Lens多項式 / Minor束の連結性 / 混合多項式 / 馴れた特異点 / Lojasiewicz不等式 / Whitney Stratification / 代数学 / 幾何学
Outline of Final Research Achievements

I gave a estimation of the number of roots of mixed polynomial of generalized Lens eqaution and applied this result for the study of the moduli space of mixed homogeneous polynomials of two variables. In a joint paper wit Inaba-Kawashima, we proved the last unsolved conjecture: Cyclic simplicialmixed polynomial link is isotopic to the contracted holomorphic link. I have also proved that the Milnor fiber of mixed polynomial is 0-connected and gave a conjecture:For 3 variable mixed homogeneous polynomial $f$, the coreespondinh projective curve in P^2, has a commutative fundamental group for the complement. I also gave several examples which support this conjecture.

Academic Significance and Societal Importance of the Research Achievements

一般化されたレンズ方程式は天文学やその他の分野で重要な関係があるようで、その意味でも我々の結果は意味深いようである。また実代数幾何学への応用もみこまれている。稲葉―川島との共同研究の成果は、私が2010年に「単体的混合多項式のリンクは縮約した複素多項式のリンクとイソトーピック」という結果の最後に残された場合:巡回型単体的混合多項式に関して肯定的に示したもので、応用上じゅうようである。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (22 results)

All 2019 2018 2017 2016

All Journal Article (11 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 10 results,  Open Access: 6 results) Presentation (9 results) (of which Int'l Joint Research: 7 results,  Invited: 9 results) Book (2 results)

  • [Journal Article] Łojasiewicz exponents of non-degenerate holomorohic and mixed functions2018

    • Author(s)
      M. Oka
    • Journal Title

      Kodai Mathematical Journal

      Volume: 41 Issue: 3 Pages: 620-651

    • DOI

      10.2996/kmj/1540951257

    • NAID

      130007506528

    • ISSN
      0386-5991, 1881-5472
    • Year and Date
      2018-10-31
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Topology of mixed hypersurfaces of cyclic type2018

    • Author(s)
      K. Inaba, M. Kawashima and M. Oka
    • Journal Title

      Journal of the Mathematical Society of Japan

      Volume: 70 Issue: 1 Pages: 387-402

    • DOI

      10.2969/jmsj/07017538

    • NAID

      130006334148

    • ISSN
      0025-5645, 1881-1167, 1881-2333
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] On the roots of an extended lens equation and an application2018

    • Author(s)
      M. Oka
    • Journal Title

      Springer Proc.Math. Stat.

      Volume: 222 Pages: 489-511

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Whitney regularity and Thom condition for families of non-isolated mixed singularities2018

    • Author(s)
      C. Eyral and M. Oka
    • Journal Title

      Journal of the Mathematical Society of Japan

      Volume: 70 Issue: 4 Pages: 1305-1336

    • DOI

      10.2969/jmsj/77437743

    • NAID

      130007501061

    • ISSN
      0025-5645, 1881-1167, 1881-2333
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Smooth mixed projective curves and a conjecture2018

    • Author(s)
      M. Oka
    • Journal Title

      J. Singul.

      Volume: 18 Pages: 329-349

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Topology of mixed hyper surfaces of cyclic type2018

    • Author(s)
      Ina, K*, Kawashima, M* and Oka, M*
    • Journal Title

      J.Math.Soc. Japan

      Volume: 70 Pages: 387-402

    • NAID

      130006334148

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] On the fundamental groups of non-generic R-join type curves II2018

    • Author(s)
      Eyral, C* and Oka, M*
    • Journal Title

      J. Math. Soc. Japan

      Volume: 69 Pages: 387-402

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] On the roots of extended Lens equation and an Application2018

    • Author(s)
      Oka, M*
    • Journal Title

      Singularities and Foliations. Geometry, Topology and Applications

      Volume: 222 Pages: 489-512

    • DOI

      10.1007/978-3-319-73639-6_16

    • ISBN
      9783319736389, 9783319736396
    • Related Report
      2017 Research-status Report
  • [Journal Article] Non-compact Newton boundary and Whitney equisingularity2017

    • Author(s)
      Eyral, C* and Oka, M*
    • Journal Title

      Adv. Math.

      Volume: 316 Pages: 94-113

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Topology of Mixed hypersurface of cyclic type2017

    • Author(s)
      K.Inaba, M. Kawashima and M. Oka
    • Journal Title

      J.Math. Soc. Japan

      Volume: 69

    • NAID

      130006334148

    • Related Report
      2016 Research-status Report
    • Peer Reviewed
  • [Journal Article] On the fundamental groups of non-generic R-join type curves, II2017

    • Author(s)
      C. Eyral and M. Oka
    • Journal Title

      J. Math. Soc. Japan

      Volume: 69 Pages: 241-262

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] On the Milnor fibration of $f \bar g$2019

    • Author(s)
      岡 睦雄
    • Organizer
      International workshop on Geometry, Analysis and Algebra
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Introduction of mixed singularities2018

    • Author(s)
      Mutsuo Oka
    • Organizer
      日仏越3か国特異点会議
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] On the connectivity of Milnor fiber of mixed function2018

    • Author(s)
      Mutsuo Oka
    • Organizer
      Papadima memorial Conference
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Smooth projective mixed curves and a conjecture2018

    • Author(s)
      Mutsuo Oka
    • Organizer
      The 13th Kagoshima Algebra-Analysis-Geometry Seminar
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On the connectivity of Milnor fiber of a mixed polynomial2018

    • Author(s)
      Mutsuo Oka
    • Organizer
      Singularity workshop at Sendai
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] Lojasiewicz inequality and its application2017

    • Author(s)
      Mutsuo Oka
    • Organizer
      Geometry of Singularities
    • Place of Presentation
      VISMA, Vietnam
    • Year and Date
      2017-02-21
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Lojasiewicz exponents for a non-degenerate holomorphic and mixed function2017

    • Author(s)
      Mutsuo Oka
    • Organizer
      Singularity theory Conference
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Geometry of weighted homogeneous mixed polynomials2017

    • Author(s)
      Mutsuo Oka
    • Organizer
      Panorama of Singularities
    • Place of Presentation
      Seville, Spain
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On the generalized Lens equations and its application2016

    • Author(s)
      Mutsuo Oka
    • Organizer
      Geometry of analytic functions
    • Place of Presentation
      Bedlevo, Poland
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Book] 複素および混合超曲面特異点入門2018

    • Author(s)
      岡 睦雄
    • Total Pages
      246
    • Publisher
      丸善出版
    • ISBN
      9784621301081
    • Related Report
      2018 Annual Research Report 2017 Research-status Report
  • [Book] Singularities in Geometry,Topology,Foliations and Dynamics2017

    • Author(s)
      J. L.Cisneros-Molina,D.T. Le,M. Oka, J. Snousi(編集者)
    • Total Pages
      231
    • Publisher
      Birkhauser
    • Related Report
      2016 Research-status Report

URL: 

Published: 2016-04-21   Modified: 2023-03-16  

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