Ibaraki University's
College of Science
Department of Science (Mathematics and Informatics Course)

Associate Professor


Other affiliation / position

  1. Office of Institutional Research and Planning

Academic background

  1. Saitama University Faculty of Science 数学科 1983 Graduated
  2. Ochanomizu University Graduate School, Division of Natural Science 数学専攻 Master course 1985 Completed
  3. University of Tsukuba Graduate School, Division of Mathematics 数学専攻 Doctor course 1987 Withdrawn before completion

Academic degrees

  1. Doctor of Mathematics University of Tsukuba
  2. Master of Science Ochanomizu University

Research Areas

  1. Geometry

Research keywords

  1. manifold, polyhedron, total curvature

Subject of research

  1. Geometry of Total Curvature


  1. Research paper (scientific journal) Joint A natural generalization of regular convex polyhedra Jin-ichi Itoh and Fumiko Ohtsuka Topology and its Applications elsevier 219, 43-54 2017
  2. Research paper (scientific journal) Joint Some remarks on simple closed geodesics of surfaces with ends Jin-ichi Itoh, Fumiko Ohtsuka and Tudor Zamfirescu Bull. Math. Soc. Sci. Math. Roumanie 52(100), 311-319 2009
  3. Research paper (scientific journal) Only Erratum to: "Structure of flat piecewise Riemannian 2-polyhedra" Fumiko Ohtsuka Math. J. Ibaraki Univ. 37, 107-114 2005
  4. Research paper (scientific journal) Joint Total curvature of noncompact piecewise Riemannian 2-polyhedra Jin-ichi Itoh, Fumiko Ohtsuka Tsukuba J. Math. 29, 471-493 2005
  5. Research paper (scientific journal) Only Structure of flat piecewise Riemannian 2-polyhedra Fumiko Ohtsuka Math. J. Ibaraki Univ. 36, 57-64 2004

Memberships of academic societies

  1. The Mathematical Society of Japan