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Research on the structure of polyhedra from the viewpoint of total curvature

Research Project

Project/Area Number 17540060
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

OHTSUKA Fumiko  Ibaraki University, 理学部, 准教授 (90194208)

Co-Investigator(Kenkyū-buntansha) 伊藤 仁一  熊本大学, 教育学部, 教授 (20193493)
大嶋 秀明  茨城大学, 理学部, 教授 (70047372)
卜部 東介  茨城大学, 理学部, 教授 (70145655)
Co-Investigator(Renkei-kenkyūsha) ITOH Jin-ich  熊本大学, 教育学部, 教授 (20193493)
OSHIMA Hideaki  茨城大学, 理学部, 教授 (70047372)
Project Period (FY) 2005 – 2008
Project Status Completed (Fiscal Year 2008)
Budget Amount *help
¥3,840,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥540,000)
Fiscal Year 2008: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2007: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2006: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2005: ¥800,000 (Direct Cost: ¥800,000)
Keywords多面体 / 全曲率 / 定曲率
Research Abstract

2次元非コンパクトな piecewise Riemannian polyhedron 上に全曲率を定義し、その定義の下でのCohn-Vossen 型の定理(全曲率の上からの評価)について研究を行った。実際には、強い意味と弱い意味での2種類の定義を与え、上記の定理は強い意味の曲率のもとで成立し、弱い意味の曲率のもとでは成立しないことを示した。更に、定曲率多面体の分類を研究するための手始めとして、平坦性を定義し、平坦な多面体を分類した。

Report

(5 results)
  • 2008 Annual Research Report   Final Research Report ( PDF )
  • 2007 Annual Research Report
  • 2006 Annual Research Report
  • 2005 Annual Research Report
  • Research Products

    (24 results)

All 2009 2008 2007 2006 2005 Other

All Journal Article (22 results) (of which Peer Reviewed: 13 results) Remarks (2 results)

  • [Journal Article] Acute triangulations of flat tori2009

    • Author(s)
      J. Itoh and L. Yuan
    • Journal Title

      European J. Combin 30

      Pages: 1-4

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Acute triangulations of flat tori2009

    • Author(s)
      J, Itoh and, et.al.
    • Journal Title

      European J. Combin 30

      Pages: 1-4

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A quotient group of the group of self homotopy equivalences of SO(4)2008

    • Author(s)
      H. Oshima
    • Journal Title

      Kodai Mathematical Journal 31

      Pages: 82-91

    • Related Report
      2008 Final Research Report 2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Acute triangulations of the regular dodecahedral surface2007

    • Author(s)
      J. Itoh & T. Zamfirescu
    • Journal Title

      Europian J. of Combinatorics 28

      Pages: 1072-1082

    • Related Report
      2008 Final Research Report 2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Cut loci and distance functions2007

    • Author(s)
      J. Itoh & T. Sakai
    • Journal Title

      Math. J. Okayama Univ. 49

      Pages: 65-92

    • Related Report
      2008 Final Research Report 2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Homotopy classes of self-maps and induced homomorphisms of homotopy groups2006

    • Author(s)
      M. Arkowitz, H. Oshima and J. Strom
    • Journal Title

      J. Math. Soc. Japan 58

      Pages: 401-418

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Tightness of Graphs : Realizations with the two-piece-property2006

    • Author(s)
      J. Itoh and W. K\"{u}hnel
    • Journal Title

      Review Roumaine Mathematique Pures et Appliques 51

      Pages: 1-19

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Tetrahedra passing through a circular or square hole2006

    • Author(s)
      J.Itoh, Y.Tanoue and, T.Zamfirescu
    • Journal Title

      Rendiconti del Circolo Matematico di Palermo 77

      Pages: 349-354

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] On the length of simple closed quasigeodesics on convex surfaces2006

    • Author(s)
      J. Itoh and C. V\^\i lcu
    • Journal Title

      Comptes Rendus Math. 343

      Pages: 259-264

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Tightness of Graphs : Realization with the two-piece-property2006

    • Author(s)
      J.Itoh, W.K"{u}hnel
    • Journal Title

      Review Roumaine Mathematique Pures et Appliques 51

      Pages: 1-19

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Tetrahedra passing through a circular or square hole2006

    • Author(s)
      J.Itoh, Y.Tanoue, T.Zamfirescu
    • Journal Title

      Rendiconti del Circolo Matematico di Palermo 77

      Pages: 349-354

    • Related Report
      2006 Annual Research Report
  • [Journal Article] On the length of simple quasigeodesics on convex surfaces2006

    • Author(s)
      J.Itoh, C.V^i Icu
    • Journal Title

      Comptes Rendus Math. 343

      Pages: 259-264

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Homotopy classes of self-maps and induced homomorphisms of homotopy groups2006

    • Author(s)
      M.Arkovitz, H.Oshima, J.Strom
    • Journal Title

      J.Math.Soc.Japan 58

      Pages: 401-418

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Total curvature of noncompact piecewise Riemannian 2-polyhedra2005

    • Author(s)
      J. Itoh and F. Ohtsuka
    • Journal Title

      Tsukuba J. Math. 29

      Pages: 471-493

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Erratum to : "Structure of flat piecewise Riemannian 2-polyhedra"2005

    • Author(s)
      F. Ohtsuka
    • Journal Title

      Math. J. Ibaraki Univ. 37

      Pages: 107-114

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] On the length of the cut locus for finitely many points2005

    • Author(s)
      J. Itoh and T. Zamfirescu
    • Journal Title

      Advanced Geometry 5

      Pages: 97-106

    • Related Report
      2008 Final Research Report
  • [Journal Article] Gauss-type curvatures and tubes for polyhedral surfaces2005

    • Author(s)
      J. Itoh
    • Journal Title

      Kumamoto J. Math 18

      Pages: 51-56

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Simplicies passing through a hole2005

    • Author(s)
      J. Itoh and T. Zamfirescu
    • Journal Title

      J. of Geometry 83

      Pages: 65-70

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Total curvature of noncompact piecewise Rieman 2-Polyhedra2005

    • Author(s)
      J.Itoh, F.Ohtsuka
    • Journal Title

      Tsukuba J.Math 29

      Pages: 471-493

    • Related Report
      2005 Annual Research Report
  • [Journal Article] On the length of the cut locus for finitely many points2005

    • Author(s)
      J.Itoh, T.Zamfirescu
    • Journal Title

      Advanced Geometry 5

      Pages: 97-106

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Gauss-type curvatures and tubes for polyhedral surfaces2005

    • Author(s)
      J.Itoh
    • Journal Title

      Kumamoto J.Math. 18

      Pages: 51-56

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Simplicies passing through a hole2005

    • Author(s)
      J.Itoh, T.Zamfirescu
    • Journal Title

      J.of Geometry 83

      Pages: 65-70

    • Related Report
      2005 Annual Research Report
  • [Remarks]

    • URL

      http://info.ibaraki.ac.jp/scripts/websearch/index.htm

    • Related Report
      2008 Annual Research Report
  • [Remarks] 茨城大学研究者情報総覧

    • URL

      http://info.ibaraki.ac.jp/scripts/websearch/index.htm

    • Related Report
      2007 Annual Research Report

URL: 

Published: 2005-04-01   Modified: 2016-04-21  

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