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J-GLOBAL ID:200901085966644943   Update date: Dec. 18, 2024

Umehara Masaaki

ウメハラ マサアキ | Umehara Masaaki
Affiliation and department:
Job title: Professor
Homepage URL  (1): http://m-umehara.g.dgdg.jp
Research field  (1): Geometry
Research keywords  (1): Differential Geometry
Research theme for competitive and other funds  (44):
  • 2022 - 2027 ワイエルストラス表現公式の類似と特異点における延長問題
  • 2021 - 2026 Differential geometrey of singularities and its applications
  • 2017 - 2022 Singularities of surfaces and hypersurfaces in Lorentzian space forms
  • 2015 - 2018 Studies on diameter conjecture on flat tori in the unit sphere
  • 2014 - 2018 Surfaces with singularities in space-times and Weierstrass-type representation formulas
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Papers (57):
  • Naoya Ando, Masaaki Umehara. Umbilics of Surfaces in the Lorentz-Minkowski 3-Space. Results in Mathematics. 2023. 78. 6
  • A. Honda, K. Naokawa, K. Saji, M. Umehara, K. Yamada. On the existence of four or more curved foldings with common creases and crease patterns. Beiträge zur Algebra und Geometrie / Contributions to Algebra and Geometry. 2022. 63. 4. 723-761
  • S. Fujimori, Y. Kawakami, M. Kokubu, W. Rossman, M. Umehara, K. Yamada, S.-D. Yang. Analytic extensions of constant mean curvature one geometric catenoids in de Sitter 3-space. Differential Geometry and its Applications. 2022. 84. 101924-101924
  • Masaaki Umehara, Kotaro Yamada. Hypersurfaces with light-like points in a lorentzian manifold ii. Kodai Mathematical Journal. 2021. 44. 1. 69-76
  • Atsufumi Honda, Kosuke Naokawa, Masaaki Umehara, Kotaro Yamada. Isometric deformations of wave fronts at non-degenerate singular points. Hiroshima Mathematical Journal. 2020. 50. 3
more...
MISC (54):
  • Shintaro Akamine, Atsufumi Honda, Masaaki Umehara, Kotaro Yamada. Null hypersurfaces in Lorentzian manifolds with the null energy condition. 2019
  • Shintaro Akamine, Atsufumi Honda, Masaaki Umehara, Kotaro Yamada. Bernstein-type theorem for zero mean curvature hypersurfaces without time-like points in Lorentz-Minkowski space. Bulletin of the Brazilian Mathematical Society, New Series (2020). 2019. 52. 1. 175-181
  • Atsufumi Honda, Kosuke Naokawa, Masaaki Umehara, Kotaro Yamada. Isometric deformations of wave fronts at non-degenerate singular points. to appear in Hiroshima Mathematical Journal. 2017
  • S. Fujimori, Y. W. Kim, S. -E. Koh, W. Rossman, H. Shin, M. Umehara, K. Yamada, S. -D. Yang. ZERO MEAN CURVATURE SURFACES IN LORENTZ-MINKOWKI 3-SPACE WHICH CHANGE TYPE ACROSS A LIGHT-LIKE LINE (vol 52, pg 285, 2015). OSAKA JOURNAL OF MATHEMATICS. 2016. 53. 1. 289-292
  • Francisco Martin, Masaaki Umehara, Kotaro Yamada. Complete bounded null curves immersed in C-3 and SL(2, C) (vol 36, pg 119, 2009). CALCULUS OF VARIATIONS AND PARTIAL DIFFERENTIAL EQUATIONS. 2013. 46. 1-2. 439-440
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Books (4):
  • 特異点をもつ曲線と曲面の微分幾何学
    丸善 2017
  • 曲線と曲面 : 微分幾何的アプローチ
    裳華房 2002 ISBN:9784785315313
  • Differential and Symplectic Topology of Knots and Curves (American Mathematical Society Translations: Series 2, vol.190)
    American Mathematical Society 1999 ISBN:9780821813546
  • Differential and Symplectic Topology of Knots and Curves (American Mathematical Society Translations: Series 2, vol.190)
    American Mathematical Society 1999 ISBN:9780821813546
Lectures and oral presentations  (6):
  • Hypersurfaces with light-like points in Lorentzian manifolds
    (15th International Workshop on Real and Complex Singularities, Brail 2018)
  • Surfaces with light-like points in Lorentz-Minkowski 3-space
    (International workshop "Geometry of Submanifolds and Integrable System",大阪市立大学理学部 2018)
  • 特異点の微分幾何学- 3次元時空の極大曲面をテーマにして-
    (日本応用数理学会2017年度 年会・総合講演 2017)
  • 特異点をもつ曲面の幾何学
    (第63回幾何学シンポジウム@岡山大学 2016)
  • Indices of isolated umbilics on surfaces
    (Geometric Analysis in Geometery and Topology 2015)
more...
Education (3):
  • 1984 - 1987 筑波大学数学研究科博士課程で修士号取得後に退学
  • - 1984 Keio University Faculty of Engineering
  • - 1984 Keio University
Professional career (1):
  • Ph. D (University of Tsukuba)
Work history (7):
  • 2011/04 - 現在 東京工業大学・情報理工学研究院 教授
  • 2003/04 - 2011/03 大阪大学理学研究科 教授
  • 1998/04 - 2003/03 広島大学理学研究科 教授
  • 1996/04 - 1998/03 Osaka University School of Science
  • 1994/04 - 1996/03 Osaka University School of Science
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Awards (2):
  • 1995 - 幾何学賞(日本数学会)
  • 日本数学会 日本数学会秋季賞 特異点をもつ曲面およびローレンツ-ミンコフスキー空間内の曲面の微分幾何学
Association Membership(s) (1):
Math. Soc. Japan
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