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2022 Fiscal Year Annual Research Report

Commutative Ring Theory via Resolution of Singularities

Research Project

Project/Area Number 20K03522
Research InstitutionMeiji University

Principal Investigator

渡辺 敬一  明治大学, 研究・知財戦略機構(生田), 研究推進員(客員研究員) (10087083)

Project Period (FY) 2020-04-01 – 2023-03-31
Keywordselliptic singularity / reduction numbers / Hilbert-Kubz 重複度 / F-signature / Inverse polynomial
Outline of Annual Research Achievements

今回の成果として次が挙げられる
1. 2次元の整閉イデアルに関し.渡辺は山形大の奥間智弘教授,日本大学の吉田健一教授,Grnova 大学の Evelina Rossi 教授との共同研究で,「楕円イデアル」の概念を定義した.楕円イデアルは大変有用な概念で,「Pg イデアル」以外の整閉イデアルの性質を研究するのに,大変有用である.研究成果が "Normal Hilbert coefficients and elliptic ideals in normal 2-dimensional local domains", Nagoya Math. J.,vol. 248 (2022), 779-800; が,奥間教授,吉田教授と Genova 大学の M.E. Rossi 教授との共著で出版された.
2. 正標数の手法を用いた研究については,特に Hilbert-Kunz (以下 HK と省略) 重複度の概念を研究し,次数付き環に対する Hilbert-Kunz density function の研究を インド Tata 研究所の Trivedi 教授と行なった.また Hilbert-Kunz 重複度と F-signature の上限を与える論文" Lower bounds on Hilbert-Kunz multiplicities and maximal F-signatures, Math. Proc. Cambridge Phil. Soc., vol. 174 (2023), 247-271 Ilya Smirnov, Basque Center for Alpplied Math.), Jack Jeffries (Nebraska 大), 吉田健一教授との共著).
このように,本研究は多数の共同研究を含めた,大変成果の多いものであった.

  • Research Products

    (5 results)

All 2022

All Journal Article (3 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 3 results) Presentation (2 results)

  • [Journal Article] NORMAL HILBERT COEFFICIENTS AND ELLIPTIC IDEALS IN NORMAL TWO-DIMENSIONAL SINGULARITIES2022

    • Author(s)
      OKUMA TOMOHIRO、ROSSI MARIA EVELINA、WATANABE KEI-ICHI、YOSHIDA KEN-ICHI
    • Journal Title

      Nagoya Mathematical Journal

      Volume: 248 Pages: 779~800

    • DOI

      10.1017/nmj.2022.5

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Hilbert-Kunz density function for graded domains2022

    • Author(s)
      Trivedi Vijaylaxmi、Watanabe Kei-Ichi
    • Journal Title

      Journal of Pure and Applied Algebra

      Volume: 226 Pages: 106835~106835

    • DOI

      10.1016/j.jpaa.2021.106835

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Lower bounds on Hilbert?Kunz multiplicities and maximal <i>F</i>-signatures2022

    • Author(s)
      JEFFRIES JACK、NAKAJIMA YUSUKE、SMIRNOV ILYA、WATANABE KEI?ICHI、YOSHIDA KEN?ICHI
    • Journal Title

      Mathematical Proceedings of the Cambridge Philosophical Society

      Volume: 174 Pages: 247~271

    • DOI

      10.1017/S0305004122000238

    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Inverse Polynomials of numerical semigroup rings2022

    • Author(s)
      Kei-ichi Watanabe
    • Organizer
      International Meeting on Numerical Semigroups, Roma, 2022,
  • [Presentation] Elliptic ideals in 2 dimensional normal local rings2022

    • Author(s)
      Kei-ichi Watanabe
    • Organizer
      Commutative Algebra Seminar, University of Utah.

URL: 

Published: 2023-12-25  

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