オオツカ フミコ大塚 富美子准教授Fumiko OHTSUKA
■研究者基本情報
■研究活動情報
論文
- Classification of non-degenerate regular polyhedral complexes of positive curvature
Fumiko Ohtsuka, Department of Mathematics, Faculty of Science
Mathematical Journal of Ibaraki University, 2024年, ［査読有り］ - 〔主要な業績〕Some geometric properties of regular polyhedral complexes
Fumiko Ohtsuka
Math. J. Ibaraki Univ., 2022年08月, ［査読有り］ - Structure of 2-skeletons of higher dimensional regular polytopes
Fumiko Ohtsuka
Math. J. Ibaraki Univ., 2018年, ［査読有り］ - A natural generalization of regular convex polyhedra
Jin-ichi Itoh; Fumiko Ohtsuka, 筆頭著者
TOPOLOGY AND ITS APPLICATIONS, 2017年03月, ［査読有り］ - Some remarks on simple closed geodesics of surfaces with ends
Jin-ichi Itoh; Fumiko Ohtsuka and Tudor Zamfirescu, 筆頭著者
Bull. Math. Soc. Sci. Math. Roumanie, 2009年, ［査読有り］ - Total curvature of noncompact piecewise Riemannian 2-polyhedra
Jin-ichi Itoh; Fumiko Ohtsuka, 筆頭著者, Institute of Mathematics, University of Tsukuba
Tsukuba J. Math., 2005年, ［査読有り］ - Erratum to: "Structure of flat piecewise Riemannian 2-polyhedra"
Fumiko Ohtsuka, The object of our research is a piecewise Riemannian 2-polyhedron which is a combinatorial 2-polyhedron such that each 2-simplex is isometric to a triangle bounded by three smooth curves on some Riemannian 2-manifold. In the previous paper [4], which is a joint work with J. Itoh, we have introduced the concept of total curvature for piecewise Riemannian 2-polyhedra and proved a generalized Gauss-Bonnet theorem and a generalized Cohn-Vossen theorem. In this paper, we shall give a definition of flatness of piecewise Riemannian 2-polyhedra and characterize them., イバラキ ダイガク リガクブ スウガク キョウシツ
Math. J. Ibaraki Univ., 2005年 - Structure of flat piecewise Riemannian 2-polyhedra
Fumiko Ohtsuka, The object of our research is a piecewise Riemannian 2-polyhedron which is a combinatorial 2-polyhedron such that each 2-simplex is isometric to a triangle bounded by three smooth curves on some Riemannian 2-manifold. In the previous paper [4], which is a joint work with J. Itoh, we have introduced the concept of total curvature for piecewise Riemannian 2-polyhedra and proved a generalized Gauss-Bonnet theorem and a generalized Cohn-Vossen theorem. In this paper, we shall give a definition of flatness of piecewise Riemannian 2-polyhedra and characterize them., イバラキ ダイガク リガクブ スウガク キョウシツ
Math. J. Ibaraki Univ., 2004年, ［査読有り］ - Total excess on length surfaces
Yoshiroh Machigashira; Fumiko Ohtsuka, 責任著者
Mathematische Annalen, 2001年, ［査読有り］ - Total excess and Tits metric for piecewise Riemannian 2-manifolds
Kazuhiro Kawamura; Fumiko Ohtsuka, 筆頭著者
Topology and its Applications, 1999年, ［査読有り］ - The existence of a straight line of piecewise Riemannian 2-manifolds
Kazuhiro Kawamura; Fumiko Ohtsuka, 筆頭著者
Note di Matematica, 1998年, ［査読有り］ - Hausdorff approximations on Hadamard manifolds and their ideal boundaries
Fumiko Ohtsuka
Tsukuba Journal of Mathematics, 1996年, ［査読有り］ - Rigidity of compact ideal boundaries of manifolds joined by Hausdorff approximations
Fumiko Ohtsuka, The concept of ideal boundary of Hadamard monifolds was introduced by Eberlein and O'Neill [3] in 1973, which had marked a millestone is the study of the geometry of noncompact Reimannian manifolds. Since then, it has been utilized in various fields of research on Hadamard manifolds. ..., 筑波大学
Tsukuba Journal of Mathematics, 1994年, ［査読有り］ - The Euclidean factor of a Hadamard manifold
Toshiaki Adachi; Fumiko Ohtsuka
Proceedings of the American mathematical Society, 1991年, ［査読有り］ - On manifolds having some restricted ideal boundaries
Fumiko Ohtsuka
Geometriae Dedicata, 1991年, ［査読有り］ - On a relation between the total curvature and Tits metric
Fumiko Ohtsuka, イバラキ ダイガク リガクブ スウガク キョウシツ
Bulletin of the Faculity of Science, Ibaraki University, Series A, 1988年, ［査読有り］ - On the existence of a straight line
Fumiko Ohtsuka, 筑波大学
Tsukuba Journal of Mathematics, 1988年, ［査読有り］ - Complete 2-transnormal hypersurfaces in a kaehler manifold of negative constant holomorphic sectional curvature
Fumiko Ohtsuka, 筑波大学
Tsukuba Journal of Mathematics, 1987年, ［査読有り］ - Compact 2-transnormal hypersurface in a kaehler manifold of constant holomorphic sectional curvature
Fumiko Ohtsuka, 筑波大学
Tsukuba Journal of Mathematics, 1986年, ［査読有り］
