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2008 Fiscal Year Final Research Report

Generalizations of Weierstrass-type representation formula and their applications to theory of surface with singularities

Research Project

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Project/Area Number 18340019
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Geometry
Research InstitutionKyushu University

Principal Investigator

YAMADA Kotaro  Kyushu University -> 九州大学, 大学院・数理学研究院, 教授 (10221657)

Co-Investigator(Kenkyū-buntansha) MIYAOKA Reiko  東北大学, 大学院・理学研究科, 教授 (70108182)
SAEKI Osamu  九州大学, 大学院・数理学研究院, 教授 (30201510)
OTSU Yukio  九州大学, 大学院・数理学研究院, 准教授 (80233170)
NAGATOMO Yasuyuki  九州大学, 大学院・数理学研究院, 准教授 (10266075)
TAKAYAMA Haruko  九州大学, 大学院・数理学研究院, 助教 (90274430)
UMEHARA Masaaki  大阪大学, 大学院・理学研究科, 教授 (90193945)
KUROSE Takashi  福岡大学, 理学部, 教授 (30215107)
KOKUBU Masatoshi  東京電機大学, 工学部, 准教授 (50287439)
Co-Investigator(Renkei-kenkyūsha) FUJIMORI Shoichi  福岡教育大学, 教育学部, 准教授 (00452706)
SHODA Toshihiro  佐賀大学, 文化教育学部, 准教授 (10432957)
TAKAHASHI Masaro  久留米工業高等専門学校, 准教授 (70311107)
Project Period (FY) 2006 – 2008
Keywords微分幾何 / ワイエルストラス表現 / フロント / 特異点
Research Abstract

Properties of certain classes of surfaces with singularities are investigated with Weirstrass-type representation formula. For example, global behavior of flat fronts, and behavior of singularities of maximal surfaces in Lorentz-Minkowski 3-space and mean curvature one surfaces in de Sitter 3-space are investigated.
On the other hand, as a general theory of differential geometry of singularities, a notion of singular curvature of the singular points of wave fronts is defined, and Gauss-Bonnet type formulas are obtained.

Research Products

(17 results)

All 2009 2008 2007 2006 Other

All Journal Article Presentation Remarks

  • [Journal Article] The geometry of fronts2009

    • Author(s)
      K. Saji, M. Umehara, K. Yamada
    • Journal Title

      Annals of Mathematics vol.169

      Pages: 491-529

    • Peer Reviewed
  • [Journal Article] Hyperbolic Schwarz map for the hypergeometric differential equation2008

    • Author(s)
      T. Sasaki, K. Yamada, M. Yoshida
    • Journal Title

      Experimental Mathematics vol.17

      Pages: 269-282

    • Peer Reviewed
  • [Journal Article] Derived Schwarz map of the hypergeometric differential equation and a parallel family of flat fronts2008

    • Author(s)
      T. Sasaki, K. Yamada, M. Yoshida
    • Journal Title

      International Journal of Mathematics vol.19

      Pages: 847-863

    • Peer Reviewed
  • [Journal Article] Confluence of swallowtail singularities of the hyperboic Schwarz map defined by the hypergeometric differential equation2008

    • Author(s)
      M. Noro, T. Sasaki, K. Yamada, M. Yoshida
    • Journal Title

      Experimental Mathematics vol.17

      Pages: 191-204

    • Peer Reviewed
  • [Journal Article] Singularities of maximal surfaces2008

    • Author(s)
      S. Fujimori, K. Saji, M. Umehara, K. Yamada
    • Journal Title

      Mathematische Zeitschrift vol.259

      Pages: 1827-848

    • Peer Reviewed
  • [Journal Article] Flat fronts in hyperbolic 3-space and their caustics2007

    • Author(s)
      M. Kokubu, M. Umehara, K. Yamada
    • Journal Title

      Journal of Mathematical Society of Japan vol.59(1)

      Pages: 265-299

    • Peer Reviewed
  • [Journal Article] Maximal surfaces with singularities in Minkowski space2006

    • Author(s)
      M. Umehara, K. Yamada
    • Journal Title

      Hokkaido Mathematical Journal vol.35(1)

      Pages: 13-40

    • Peer Reviewed
  • [Journal Article] Behavior of corank one singular points on wave front

    • Author(s)
      K. Saji, M. Umehara, K. Yamada
    • Journal Title

      Kyushu Journal of Mathematics vol.62(1)

      Pages: 259-280

    • Peer Reviewed
  • [Presentation] Asymptotic behavior of flat surfaces in hyperbolic 3-space2008

    • Author(s)
      K. Yamada
    • Place of Presentation
      Unversidad de Granada, Spain.
    • Year and Date
      2008-06-06
  • [Presentation] Spacelike mean curvature one surface in de Sitter 3-space2007

    • Author(s)
      K. Yamada
    • Place of Presentation
      Geometry Seminar, Northeastern University, Shenyang, China.
    • Year and Date
      2007-10-11
  • [Presentation] Spacelike mean curvature one surfaces in de Sitter 3-space2007

    • Author(s)
      山田光太郎
    • Organizer
      部分多様体論と可積分系および幾何解析とのつながり
    • Place of Presentation
      京都大学数理解析研究所.
    • Year and Date
      2007-07-11
  • [Presentation] Spacelike mean curvature one surfaces in de Sitter 3-space2007

    • Author(s)
      K. Yamada
    • Place of Presentation
      Universidad de Granada
    • Year and Date
      2007-05-10
  • [Presentation] Spacelike mean curvature 1 surfaces in de Sitter 3-space2007

    • Author(s)
      K. Yamada
    • Place of Presentation
      Mathematische Forschungsinstitut Oberwolfach, Germany
    • Year and Date
      2007-05-02
  • [Presentation] Global properties of flat fronts in hyperbolic 3-space2006

    • Author(s)
      山田光太郎
    • Organizer
      特異点論セミナー
    • Place of Presentation
      北海道大学
    • Year and Date
      2006-11-17
  • [Presentation] Flat fronts in hyperbolic 3-space2006

    • Author(s)
      山田光太郎
    • Organizer
      北海道大学集中講義オーバーヴュー
    • Place of Presentation
      北海道大学
    • Year and Date
      2006-11-13
  • [Presentation] Flat fronts in hyperbolic 3-space-behavior of ends2006

    • Author(s)
      山田光太郎
    • Organizer
      幾何学阿蘇研究集会
    • Place of Presentation
      休暇村南阿蘇
    • Year and Date
      2006-09-12
  • [Remarks] ホームページ等

    • URL
      http://www.math.titech.ac.jp/~kotaro/

URL: 

Published: 2011-06-18   Modified: 2012-08-22  

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