Torus

Symmetric space

Harmonic maps

Minimal surface theory

Integrable systems

Harmonic map theory

Global analysis

Riemannian geometry

Natural sciences, Mathematical analysis, Global Analysis

Natural sciences, Geometry, Differential Geometry

Natural sciences, Mathematical analysis, Harmonic maps, Integrable Systems

Natural sciences, Geometry, Geometry

Nov. 2012 - Present
日本大学教授

Apr. 2007 - Oct. 2012
日本大学医学部准教授

Aug. 2004 - Mar. 2007
日本大学医学部助教授

May 1988 - Jul. 2004
日本大学医学部専任講師

Apr. 1987 - Apr. 1988
日本大学医学部助手

31 Mar. 1987
Tokyo Metropolitan University, Graduate School, Division of Natural Science, Differential Geometry

Mar. 1987
Tokyo Metropolitan University, Graduate School, Division of Natural Science, Differential Geometry

1983
Waseda University, Faculty of Science and Engineering, 数学

Jul. 2001 - Jun. 2003
和文専門誌“数学”常任編集委員, 日本数学会

A characterization of a hyperplane in two-phase heat conductors
Shigeru Sakaguchi; Lorenzo Cavallina and Seiichi Udagawa
Communications in Analysis and Geometry, Sep. 2024, Refereed, Not invited
Corresponding

Simple and explicit constructions of semi-discrete surfaces and discrete surfaces
Kenji Kajiwara; Shota Shigetomi; Seiichi Udagawa
arXiv, May 2024, Not refereed, Not invited

Generating Curves of Minimal Ruled Real Hypersurfaces in a Nonflat Complex Space Form
Sadahiro Maeda; Hiromasa Tanabe; Seiichi Udagawa
Canadian Mathematical Bulletin, Dec. 2018, Refereed, Not invited
Corresponding

Affine spheres and finite gap solutions of Tzitzeica equation
Jun-ichi Inoguchi; Seiichi Udagawa
Journal of Physics Communications, Nov. 2018, Refereed, Not invited
Corresponding

Finite gap solutions for horizontal minimal surfaces of finite type in 5-sphere
Jun-ichi Inoguchi; Tetsuya Taniguchi and Seiichi Udagawa
Journal of Integrable Systems, Dec. 2016, Refereed, Not invited
Corresponding

Effects of increased use of information communication technology on a first-year medical English course.
Eric H. Jego; Seiichi Udagawa; Tetsuya Taniguchi; Hiroaki Nemoto
Journal of Medical English Education, Oct. 2016, Refereed, Not invited

CHARACTERIZATIONS OF RICCI FLAT METRICS AND LAGRANGIAN SUBMANIFOLDS IN TERMS OF THE VARIATIONAL PROBLEM
Tetsuya Taniguchi; Seiichi Udagawa
GLASGOW MATHEMATICAL JOURNAL, Sep. 2015, Refereed, Not invited

Geometry of linear and angular momenta of N-particles in the Riemannian space forms and de Sitter space
Tetsuya Taniguchi; Seiichi Udagawa
JOURNAL OF GEOMETRY AND PHYSICS, Dec. 2014, Refereed, Not invited

Some kind of stabilities and instabilities of energies of maps between Kähler manifolds
Tetsuya Taniguchi; Seiichi Udagawa
Springer Proceedings in Mathematics and Statistics, 2014, Refereed, Not invited

MINIMAL SURFACES IN THE ANTI-DE SITTER SPACETIME
Toshiyuki Ichiyama; Seiichi Udagawa
DIFFERENTIAL GEOMETRY OF SUBMANIFOLDS AND ITS RELATED TOPICS, 2014, Refereed, Invited

1st and 2nd variational formulaes for new variational problem
Tetsuya Taniguchi
Bulletin of Liberal Arts & Sciences NIhon University School of Medicine, Dec. 2012, Not refereed, Not invited
Corresponding

A homogeneous submanifold with nonzero parallel mean curvature vector in a Euclidean sphere
Sadahiro Maeda; Seiichi Udagawa
Journal of Geometry, Dec. 2011, Refereed, Not invited

Why do the circumcenter, inner center, centroid, orthocenter and excenter of triangles exist ?
Tetsuya TANIGUCHI
Bulletin of Liberal Arts & Sciences, Nihon University School of Medicine, Dec. 2009, Not refereed, Not invited
Corresponding

Characterization of Parallel Isometric Immersions of Space Forms into Space Forms in the Class of Isotropic Immersions
Sadahiro Maeda; Seiichi Udagawa
CANADIAN JOURNAL OF MATHEMATICS-JOURNAL CANADIEN DE MATHEMATIQUES, Jun. 2009, Refereed, Not invited

Pluriharmonic maps from tori into projective unitary groups and configurations of points on rational or elliptic curves
Tetsuya TANIGUCHI
Bulletin of Liberal Arts & Sciences NIhon University School of Medicine, Dec. 2008, Not refereed, Not invited
Corresponding

Generalized Veronese manifolds and isotropic immersions
Sadahiro MAEDA and Seiichi UDAGAWA
Differentail Geometry and its Applications (Proceedings of the 10th International Conference DGA2007), Apr. 2008, Refereed, Not invited
Corresponding

Schur's lemma for Kaehler manifolds
Toshiaki ADACHI; Sadahiro MAEDA and Seiichi UDAGAWA
Archiv der Mathematik, Apr. 2008, Refereed, Not invited
Corresponding

6次元球面内の(III)型の慨複素曲線の楕円関数および Riemann θ関数による表示公式
宇田川 誠一
日本大学医学部一般教育研究紀要, Dec. 2007, Not refereed, Not invited
Lead

Moduli spaces of complex Fermi curves and the Willmore functional(For further advance of the submanifold theory)
Yoshihiro OHNITA; Takashi OTOFUJI and Seiichi UDAGAWA
京都大学数理解析研究所講究録, Jan. 2007, Not refereed, Not invited
Corresponding

Ruled real hypersurfaces in a nonflat quaternionic space form
Seiichi UDAGAWA; Toshiaki ADACHI; Sadahiro MAEDA
Monatshefte fur Mathematik, Aug. 2005, Refereed, Not invited
Lead

Constructions of almost complex 2-tori of type(III) in the nearly Kahler 6-sphere
H Hashimoto; T Taniguchi; S Udagawa
DIFFERENTIAL GEOMETRY AND ITS APPLICATIONS, Sep. 2004, Refereed, Not invited

Geometry of ordinary helices in a complex projective space
Toshiaki Adachi; Sadahiro Maeda; Udagawa Seiichi
Hokkaido Mathematical Journal, 2004, Refereed, Not invited

On the construction and classification of almost complex curves in a nearly Kaehler 6-sphere
Seiichi UDAGAWA
京都大学数理解析研究所講究録, Nov. 2003, Not refereed, Not invited
Lead

Almost complex curves of type (III) in the nearly Kaehler 6-sphere
Seiichi UDAGAWA
Mem. FAc. Sci. Eng. Shimane Univ. Series B : Mathematical Science, Mar. 2002, Not refereed, Not invited
Lead

Harmonic maps of finite type into generalized flag manifolds, and twistor fibrations
Seiichi UDAGAWA and Yoshihiro OHNITA
Contemporary Mathematics(American Mathematical Society), 2002, Refereed, Not invited
Lead

Spectral curves, Dressing actions and harmonic maps of R^2 into complex Grassmann manifolds
Seiichi UDAGAWA
Mem. Fac. Sci. Eng. Shimane Univ. Series B :Mathematical Science, 2001, Not refereed, Not invited
Lead

SIMPLENESS AND CLOSEDNESS OF CIRCLES IN COMPACT HERMITIAN SYMMETRIC SPACES
Toshiaki Adachi; Sadahiro Maeda and Seiichi Udagawa
Tsukuba Journal of Mathematics, Jun. 2000, Refereed, Not invited
Corresponding

Classification problems of harmonic maps from Riemann spheres and torus to symmetric spaces (exposition and unsolved problems)
Seiichi UDAGAWA and Yoshihiro OHNITA
京都大学数理解析研究所講究録, 1999, Not refereed, Not invited
Lead

Harmonic tori in quaternionic projective 3-spaces
S Udagawa
PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, Jan. 1997, Refereed, Not invited

Circles in a complex projective space
T Adachi; S Maeda; S Udagawa
OSAKA JOURNAL OF MATHEMATICS, Sep. 1995, Refereed, Not invited

HARMONIC MAPS FROM A 2-TORUS INTO A COMPLEX GRASSMANN MANIFOLD
S UDAGAWA
INTERNATIONAL JOURNAL OF MATHEMATICS, Jun. 1995, Refereed, Not invited

Harmonic tori in complex Grassmann manifolds and quarternionic projective spaces
Seiichi UDAGAWA
京都大学数理解析研究所講究録, Mar. 1995, Not refereed, Not invited
Lead

Harmonic tori in complex Grassmann manifolds and quarternionic projective spaces
Seiichi UDAGAWA
京都大学数理解析研究所講究録, Mar. 1995, Not refereed, Not invited

On Teichmuller Theory in Riemanrian Geometry
Bulletin of Liberal avts & sciences, Nihon University School of Medicine, 1995, Not refereed, Not invited
Lead

CLASSIFICATION OF PLURIHARMONIC MAPS FROM COMPACT COMPLEX-MANIFOLDS WITH POSITIVE 1ST CHERN CLASS INTO COMPLEX GRASSMANN MANIFOLDS
S UDAGAWA
TOHOKU MATHEMATICAL JOURNAL, Sep. 1994, Refereed, Not invited

Harmonic tori in complex Grassmann manifolds and quaternionic projective spaces
Bulletin of the Liberal Arts and Science Course Nihon University School of Medicine, 1994, Not refereed, Not invited
Lead

Harmonic maps from a two-torus into a complex projective space
Bulletin of Liberal Arts and Sciences Nihon University School of Medicine, 1993, Not refereed, Not invited

On slant immersions into kÄhler manifolds
Sadahiro Maeda; Yoshihiro Ohnita; Seiichi Udagawa
Kodai Mathematical Journal, 1993, Refereed, Not invited

COMPLEX-ANALYTICITY OF PLURIHARMONIC MAPS AND THEIR CONSTRUCTIONS
Y OHNITA; S UDAGAWA
LECTURE NOTES IN MATHEMATICS, 1991, Refereed, Not invited

REAL HYPERSURFACES OF A COMPLEX PROJECTIVE SPACE IN TERMS OF HOLOMORPHIC DISTRIBUTION
Sadahiro Maeda and Seiichi Udagawa
Tsukuba Journal of Mathematics, Jun. 1990, Refereed, Not invited
Corresponding

Surfaces with constant Kaehler angle all of whose geodesics are circles in a complex space form
Sadahiro Maeda; Seiichi Udagawa
Tokyo Journal of Mathematics, 1990, Refereed, Not invited

STABILITY, COMPLEX-ANALYTICITY AND CONSTANCY OF PLURIHARMONIC MAPS FROM COMPACT KAEHLER MANIFOLDS
Y OHNITA; S UDAGAWA
MATHEMATISCHE ZEITSCHRIFT, 1990, Refereed, Not invited

HOLOMORPHICITY OF CERTAIN STABLE HARMONIC MAPS AND MINIMAL IMMERSIONS
S UDAGAWA
PROCEEDINGS OF THE LONDON MATHEMATICAL SOCIETY, Nov. 1988, Refereed, Not invited

PLURIHARMONIC MAPS AND MINIMAL IMMERSIONS OF KAHLER-MANIFOLDS
S UDAGAWA
JOURNAL OF THE LONDON MATHEMATICAL SOCIETY-SECOND SERIES, Apr. 1988, Refereed, Not invited

Minimal immersions of kaehler manifolds into complex space forms
Seiichi Udagawa
Tokyo Journal of Mathematics, 1987, Refereed, Not invited

Bi-Order real hypersurfaces in a complex projective space
Seiichi Udagawa
Kodai Mathematical Journal, 1987, Refereed, Not invited

Stable harmonic maps from riemann surfaces to compact hermitian symmetric spaces
Yoshihiro Ohnita; Seiichi Udagawa
Tokyo Journal of Mathematics, 1987, Refereed, Not invited

SPECTRAL GEOMETRY OF KAEHLER SUBMANIFOLDS OF A COMPLEX PROJECTIVE-SPACE
S UDAGAWA
JOURNAL OF THE MATHEMATICAL SOCIETY OF JAPAN, Jul. 1986, Refereed, Not invited

SPECTRAL GEOMETRY OF COMPACT HERMITIAN SYMMETRICAL SUBMANIFOLDS
S UDAGAWA
MATHEMATISCHE ZEITSCHRIFT, 1986, Refereed, Not invited

Einstein parallel kaehler submanifolds in a complex projective space
Seiichi Udagawa
Tokyo Journal of Mathematics, 1986, Refereed, Not invited

Sine-Gordon方程式の解法とその離散化
宇田川 誠一; 井ノ口 順一; 梶原 健司
日本大学医学部一般教育研究紀要 / 日本大学医学部一般教育 編, Dec. 2022

Elementary Encyclopedia of Geometry
宇田川; 砂田 利一; 加藤 文元, Contributor, 34. From Gauss-Bonnet Theorem to Index Theorem
朝倉書店, Jun. 2023
9784254111583

数学/統計学
Joint work, 第４章～１１章
医歯薬出版株式会社, Feb. 2019
9784263223161

エクセル統計学
柳沢幸雄; 宇田川誠一; 谷口哲也; 山下俊恵, Joint work, 柳沢幸雄,宇田川誠一,谷口哲也,山下俊恵
アイ・ケイ コーポレーション, Jan. 2018, Not refereed

Tzitzeica 方程式の有限間隙解に付随した極小曲面の構成理論 -Tzitzeica 方程式の楕円関数解を出発点として-
Single work, すべて, Seiichi Udagawa
Institute of Mathematics for industry, Aug. 2017

Solving the sine-Gordon equation and its descretization
Seiichi Udagawa
The 3rd Shot of The 13th MSJ-SI,"Differential Geometry and Integrable Systems", Mar. 2023, Osaka Metropolitan University Advanced Mathematical Institute, Invited

sine-Gordon方程式の解法と離散化
Seiichi Udagawa
ミニワークショップ「微分幾何・可積分系・形状生成」, Feb. 2023, 九州大学マス・フォア・インダストリ研究所, Invited

Spacelike CMC-surface in 3-dimensional anti-de Sitter space and Hill equation
Seiichi Udagawa
RIMS The 4-th International Workshop ,”Geometry of Submanifolds and Integrable Systems", Feb. 2022, Osaka City University Advanced Mathematical Institute, Invited

2次元の球面, 双曲型空間または de Sitter 空間上のN個の測地線の交点定理について
Tetsuya Taniguchi
日本数学会秋季分科会, Sep. 2010, 日本数学会, Not invited

球面内の平均曲率ベクトルが平行な等質部分多様体のある構成法
Sadahiro Maeda
日本数学会秋季分科会, Sep. 2010, 日本数学会, Not invited

N粒子の運動のN接線定理とN法線定理について
谷口 哲也 氏(北里大学一般教育部)
日本数学会秋季分科会, Sep. 2009, 日本数学会, Not invited

The DPW-method for affine spheres and the Tzitzeica equation
Seiichi UDAGAWA
New Aspects of SUrface Theory : Workshop at Tokyo Metropolitan University, May 2009, Not invited

Affine spheres of finite type and Symes method
Seiichi Udagawa
Fusion of Integrable Systems and Geometry, Apr. 2009, Not invited

一般化されたベロネーゼ多様体と等方はめ込み
前田 定広 / 宇田川 誠一
日本数学会春季分科会, Mar. 2009, Not invited

空間形から空間形への平行はめ込みの等方性による特徴付け
前田 定広 / 宇田川 誠一
日本数学会秋季分科会, Sep. 2006, Not invited

コンパクト対称空間への有限型調和写像のツイスター構成とその応用
日本数学会春季総合分科会, Mar. 2000, Not invited

種数が２以上のコンパクト・リーマン面からｋ-対称空間へのプリミティブ調和写像について
日本数学会春季総合分科会, Mar. 2000, Not invited

Harmonic tori in complex Grassmann manifolds
日本数学会春季総合分科会, Mar. 1999, Not invited

複素グラスマン多様体の円のclosed性とsimple性について
日本数学会春季総合分科会, Mar. 1997, Not invited

複素射影空間内の円（circle）について
日本数学会春季総合分科会, Mar. 1994, Not invited

コンパクト・リーマン surface からの安定調和写像について
日本数学会秋季総合分科会, Sep. 1988, Not invited

安定調和写像の正則性について
日本数学会秋季総合分科会, Sep. 1988, Not invited

Pluriharmonic map の定値性、正則性及び安定性
日本数学会秋季総合分科会, Sep. 1988, Not invited

複素射影空間のケーラー部分多様体とスペクトル幾何について
日本数学会秋季総合分科会, Sep. 1986, Not invited

ケーラー多様体から複素空間形への minimal immersionについて
日本数学会秋季総合分科会, Sep. 1986, Not invited

日本数学会

微分幾何学に現れる可積分系とその離散化
日本学術振興会, 科学研究費助成事業, 01 Apr. 2021 - 31 Mar. 2025
宇田川 誠一

The construcion of a general self study system of the basic study for the medicine and veterinary medicin by using e--Learning system
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, 01 Apr. 2015 - 31 Mar. 2018
NEMOTO Hiroaki

Designing a laboratory lesson plan for medical students based on a multidisciplinary perspective from physics, biology and mathematics
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, 01 Apr. 2012 - 31 Mar. 2015
ITOI Miho; UDAGAWA Seiichi; TAJIKA Kenichi; TASHIRO Kenji; OTAKE Shinich; ABE Takeyuki

定曲率空間における不変な等温面と一様分離曲面
広島大学大学院工学研究科, 科学研究費補助金（文部科学省）萌芽研究, 2008 - 2008

Research on Submanifold Theory via Infinite Dimensional Methods
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, 2005 - 2008
OHNITA Yoshihiro; KATO Shin; KOMORI Yohei; SAKAI Takashi; HASHIMOTO Yoshitake

Ruled real surfaces formed by Kaehler magnetic fields
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, 2005 - 2007
ADACHI Toshiaki; MAEDA Sadahiro; UDAGAWA Seiichi; YAMAGISHI Masakazu; SAEKI Akihiro; EJIRI Norio

Cayley algebra and Grassmann geometry
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, 2004 - 2006
MASHIMO Katsuya; HASHIMOTO Hideya; UDAGAWA Seiichi; TASAKI Hiroyuki; KODA Takashi

Various geometric structures and Grassmann Geometry
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, 2003 - 2005
HASHIMOTO Hideya; OZAWA Tetuya; SEKIGAWA Kouei; MASHIMO Kastuya; TSUKADA Kaxumi; UDAGAWA Seiichi

Comparison on bow-shapes for Kaehler magnetic fields
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, 2002 - 2004
ADACHI Toshiaki; MAEDA Sadahiro; EJIRI Norio; UDAGAWA Seiichi; YAMAGISHI Masakazu; SAEKI Akihiro

Differential geometry of harmonic maps, minimal submanifolds and Yang-Mills-Higgs equations
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, 2001 - 2003
OHNITA Yoshihiro; MARTIN Guest; MIYAOKA Reiko; KOIKE Naoyuki; UDAGAWA Seiichi; MORIYA Katsuhiro

Applications of integrable systems in geometry and topology
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, 2000 - 2001
GUEST Martin; KAMISHIMA Yoshinobu; OKA Mutsuo; OHNITA Yoshihiro; INOGUCHI Junichi; UDAGAWA Seiichi

Constructions of puriharmonic maps from torus into symmetric spaces and applications of theory of integrable systems
Japan Society for the Promotion of Science, 基盤研究C(2)（科学研究費）, 1997 - 1999
UDAGAWA Seiichi

Geometry related to harmonic maps
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, 1997 - 1998
MIYOOKA Reiko; TSUJI Hajime; KOTANI Motoko; OHNITA Yoshihiro; ITO Hidekazu; FUTAKI Akito

DIFFERENTIAL GEOMETRIC RESEARCH ON SUBMANIFOLDS AND STUDY OF SYSTEMS FOR THE EFFECTIVE DISSEMINATION OF RESEARCH
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, 1997 - 1998
OGIUE Koichi; MAEDA Sadahiro; NAKAMULA Ken; OHNITA Yoshihiro; KENMOTSU Katsuei; UDAGAWA Seiichi

対称空間への調和写像と可積分系理論の応用
文部科学省, 基盤研究C(2)（科学研究費）, 1994 - 1996

部分多様体と調和写像の微分幾何学
日本学術振興会, 科学研究費助成事業, 1995 - 1995
大仁田 義裕; 前田 定広; 宇田川 誠一; 武藤 秀夫; 宮岡 礼子; 荻上 紘一

複素トーラスから対称空間への調和写像の研究
奨励研究(A)（科学研究費）, 1993 - 1993

ケーラー多様体からの多重調和写像の安定性、正則性及び、それらの構成と分解について
一般研究(C)（科学研究費）, 1989 - 1991

A trial for understanding McIntosh's work with many examples
1997 - 1997