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2011 Fiscal Year Final Research Report

Hurwitz' problem on Weierstrass points on algebraic curves

Research Project

  • PDF
Project/Area Number 21540052
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Algebra
Research InstitutionKanagawa Institute of Technology

Principal Investigator

KOMEDA Jiryo  神奈川工科大学, 基礎・教養教育センター, 教授 (90162065)

Co-Investigator(Renkei-kenkyūsha) OHBUCHI Akira  徳島大学, 大学院・ソシオアーツアンドサイエンス研究部, 教授 (10211111)
Project Period (FY) 2009 – 2011
Keywords非特異代数曲線 / ワイエルシュトラス点 / ワイエルシュトラス半群 / 二重被覆 / 有理線織面 / 平面代数曲線 / 数値半群
Research Abstract

We are interested in Hurwitz' Problem which is the following : Find a necessary and sufficient computable condition on a numerical semigroup to be attained by a pointed curve, i. e., to be Weierstrass. This problem is not solved yet. But we got the following results : (1) Not every numerical semigroup whose minimum integer is eight(resp. twelve) is Weierstrass. (2) For a numerical semigroup H we denote by d(H) the numerical semigroup consisting of h/2 for even integer h in H. If the genus of d(H) is either 3 or 4 and the genus of H is larger than or equal to three times the genus of d(H), then H is Weierstrass. (3) We showed the following : If the genus of d(H) is larger than or equal to 5, the statement like(2) does not hold.

  • Research Products

    (22 results)

All 2012 2011 2010 2009 Other

All Journal Article (12 results) (of which Peer Reviewed: 8 results) Presentation (9 results) Remarks (1 results)

  • [Journal Article] Symmetric Weierstrass numerical semigroups whose quotients by two are also symmetric and Weierstrass2012

    • Author(s)
      J. Komeda
    • Journal Title

      神奈川工科大学研究報告

      Volume: B-36 Pages: 35-39

    • Peer Reviewed
  • [Journal Article] On Weierstrass semigroups of double coverings of genus three curves2011

    • Author(s)
      J. Komeda
    • Journal Title

      Semigroup Forum

      Volume: 83 Pages: 479-488

    • Peer Reviewed
  • [Journal Article] Numerical semigroups of double covering type and Hurwitz' problem2011

    • Author(s)
      J. Komeda
    • Journal Title

      数理解析研究所講究録

      Volume: 1769 Pages: 60-65

  • [Journal Article] On quasi-symmetric numerical semigroups2011

    • Author(s)
      J. Komeda
    • Journal Title

      神奈川工科大学研究報告

      Volume: B-35 Pages: 17-21

    • Peer Reviewed
  • [Journal Article] The Parents and the Children of Non-Weierstrass Semigroups2010

    • Author(s)
      J. Komeda
    • Journal Title

      数理解析研究所講究録

      Volume: 1712 Pages: 58-63

  • [Journal Article] Quotient curves of smooth plane curves with automorphisms2010

    • Author(s)
      G. Harui, T. Kato, J. Komeda, A. Ohbuchi
    • Journal Title

      Kodai Mathematical Journal

      Volume: 33 Pages: 164-172

    • Peer Reviewed
  • [Journal Article] The numerical semigroup of toric type at a ramification point on a double covering of a curve2010

    • Author(s)
      J. Komeda
    • Journal Title

      神奈川工科大学研究報告

      Volume: B-34 Pages: 57-62

    • Peer Reviewed
  • [Journal Article] The Weierstrass semigroups on the quotient curve of a plane curve of degree<=7 by an involution2009

    • Author(s)
      J. Komeda, S. J. Kim
    • Journal Title

      J. Algebra

      Volume: 322 Pages: 137-152

    • Peer Reviewed
  • [Journal Article] A generalization of Weierstrass semigroups on a double covering of a curve2009

    • Author(s)
      J. Komeda
    • Journal Title

      数理解析研究所講究録

      Volume: 1655 Pages: 124-131

  • [Journal Article] Weierstrass semigroups on a double covering of a curve of lower genus2009

    • Author(s)
      J. Komeda
    • Journal Title

      電子報告集代数幾何ミニ研究集会(埼玉大学)

  • [Journal Article] Weierstrass gap sequences at points of curves on some rational surfaces

    • Author(s)
      J. Komeda, A. Ohbuchi
    • Journal Title

      Tsukuba J. of Math

    • Peer Reviewed
  • [Journal Article] Double coverings of curves and non-Weierstrass semigroups

    • Author(s)
      J. Komeda
    • Journal Title

      Communications in Algebra

    • Peer Reviewed
  • [Presentation] Diagrams of Weierstrass semigroups constructed from the parent map and the quotient map by two2012

    • Author(s)
      J. Komeda
    • Organizer
      Algebraic Geometry Seminar in Seoul National University
    • Place of Presentation
      韓国・ソウル大学
    • Year and Date
      2012-03-22
  • [Presentation] The Fractional Map by Two and the Parent Map of Numerical Semigroups2012

    • Author(s)
      J. Komeda
    • Organizer
      RIMS研究集会「代数系および計算機科学基礎」
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2012-02-22
  • [Presentation] Numerical semigroups which are the double covering type and Hurwitz' problem2011

    • Author(s)
      J. Komeda
    • Organizer
      RIMS研究集会「代数と言語のアルゴリズムと計算理論」
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2011-02-21
  • [Presentation] Weierstrass semigroups on double coverings of non-singular plane curves of degree 52010

    • Author(s)
      J. Komeda
    • Organizer
      代数幾何講演会
    • Place of Presentation
      埼玉大学
    • Year and Date
      2010-12-14
  • [Presentation] Non-Weierstrass numerical semigroups' genealogy2010

    • Author(s)
      J. Komeda
    • Organizer
      Algebraic Geometry Seminar in Seoul National University
    • Place of Presentation
      韓国・ソウル大学
    • Year and Date
      2010-09-01
  • [Presentation] Weierstrass semigroups on double coverings of curves of genus 3 or 42010

    • Author(s)
      J. Komeda
    • Organizer
      Workshop on Galois point and related topics
    • Place of Presentation
      神奈川大学富士見高原研修所
    • Year and Date
      2010-06-05
  • [Presentation] Weierstrass semigroups on double coverings of curves2010

    • Author(s)
      J. Komeda
    • Organizer
      Mini Festival on Algebraic Curves
    • Place of Presentation
      韓国・ソウル大学
    • Year and Date
      2010-03-23
  • [Presentation] The parents and the children of non-Weierstrass semigroups2010

    • Author(s)
      J. Komeda
    • Organizer
      京都大学数理解析研究所研究集会「代数と言語のアルゴリズムと計算理論」
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2010-02-17
  • [Presentation] On Weierstrass pairs on a curve and Weierstrass semigroups on a double covering of the curve2009

    • Author(s)
      J. Komeda
    • Organizer
      Workshop on Galois points and related topics
    • Place of Presentation
      神奈川大学富士見高原研修所
    • Year and Date
      2009-06-06
  • [Remarks]

    • URL

      http://www.gen.kanagawa-it.ac.jp/~komeda/komeda_labo.html

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Published: 2013-07-31   Modified: 2015-06-09  

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