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Study on Durfee-type inequalities of complete intersection singularities

Research Project

Project/Area Number 19K23407
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0201:Algebra, geometry, analysis, applied mathematics,and related fields
Research InstitutionTokyo University of Science

Principal Investigator

Enokizono Makoto  東京理科大学, 理工学部数学科, 助教 (30843461)

Project Period (FY) 2019-08-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords特異点 / ファイバー多様体 / 代数曲面 / 消滅定理 / モジュライ / スロープ不等式 / ファイバー曲面 / 正標数曲面 / Reider型定理 / 有理点 / Zariski分解 / 拡張定理 / ゴナリティー
Outline of Research at the Start

本研究の目的は、孤立完全交叉特異点に対し、そのミルナー数、幾何種数、埋込次元や標準サイクルの自己交点数などの不変量の間の不等式や関係式を導出することである。本研究では、このような特異点の問題に対し、ファイバー多様体の不変量の地誌学的研究の観点からアプローチする。
まず一般ファイバーが射影空間の中で完全交叉であるようなファイバー多様体に対し、そのスロープの下限を、一般ファイバーの定義多項式の個数や次数、全空間の次元を用いて求め、特異点とその解消空間をファイバー多様体にコンパクト化し、特異点とファイバー多様体を関連させ、特異点の不変量の関係式を導く。

Outline of Final Research Achievements

In this study, we aimed to derive inequalities and equations between the Milnor number, the geometric genus, the embedding dimension, and the self-intersection numbers of canonical cycles for isolated complete intersection singularities. By embedding the resolution space of the singularities into certain types of fibered varieties, we reduced the problem to numerical invariants of fibered varieties. We first examined this problem in the case where the fiber is two dimensional, and also addressed the problem of factorization of divisors on surfaces and derived the cohomology vanishing theorem for surfaces in positive characteristic.

Academic Significance and Societal Importance of the Research Achievements

本研究は特異点の問題とファイバー多様体の問題を結びつけるものである。本研究の意義の一つは、代数多様体やファイバー多様体の数値的不変量の地誌学的研究を特異点の研究に応用できることである。また、本研究で行った代数曲面の因子の分解やコホモロジーの消滅定理に関する研究は、平面曲線の有理点の特徴付けなど整数論的な応用もあり、応用数学など他の分野への意外な応用なども将来的に期待される。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (23 results)

All 2023 2021 2020 2019

All Journal Article (6 results) (of which Peer Reviewed: 1 results,  Open Access: 2 results) Presentation (17 results) (of which Int'l Joint Research: 5 results,  Invited: 15 results)

  • [Journal Article] Vanishing theorems and adjoint linear systems on normal surfaces in positive characteristic2021

    • Author(s)
      Makoto Enokizono
    • Journal Title

      arXiv

      Volume: -

    • Related Report
      2021 Research-status Report
  • [Journal Article] Durfee-type inequality for complete intersection surface singularities2021

    • Author(s)
      Makoto Enokizono
    • Journal Title

      Duke Mathematical Journal

      Volume: 170

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] An integral version of Zariski decompositions on normal surfaces2020

    • Author(s)
      Makoto Enokizono
    • Journal Title

      arXiv

      Volume: -

    • Related Report
      2020 Research-status Report
  • [Journal Article] On local invariants for fibered surfaces2020

    • Author(s)
      榎園 誠
    • Journal Title

      代数曲線論2019報告集

      Volume: 1 Pages: 13-25

    • Related Report
      2019 Research-status Report
  • [Journal Article] Uniform Bases for ideal arrangements2020

    • Author(s)
      Makoto Enokizono, Tatsuya Horiguchi, Takahiro Nagaoka, Akiyoshi Tsuchiya
    • Journal Title

      arXiv

      Volume: - Pages: 1-56

    • Related Report
      2019 Research-status Report
    • Open Access
  • [Journal Article] An additive basis for the cohomology rings of regular nilpotent Hessenberg varieties2020

    • Author(s)
      Makoto Enokizono, Tatsuya Horiguchi, Takahiro Nagaoka, Akiyoshi Tsuchiya
    • Journal Title

      arXiv

      Volume: - Pages: 1-41

    • Related Report
      2019 Research-status Report
    • Open Access
  • [Presentation] Slope inequality of fibered surfaces and moduli of curves2023

    • Author(s)
      榎園 誠
    • Organizer
      第27 回代数曲面ワークショッ プat 高知
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Slope inequality of fibered surfaces and moduli of curves2023

    • Author(s)
      榎園 誠
    • Organizer
      Various aspects of singularities
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Vanishing theorem on normal surfaces in positive characteristic2021

    • Author(s)
      榎園 誠
    • Organizer
      阪大オンライン代数幾何学セミナー
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Vanishing theorems and adjoint linear systems on normal surfaces in positive characteristic2021

    • Author(s)
      榎園 誠
    • Organizer
      特異点論セミナー
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Adjoint linear systems on normal surfaces2021

    • Author(s)
      榎園 誠
    • Organizer
      野田代数幾何学ワークショップ
    • Related Report
      2021 Research-status Report
  • [Presentation] On vanishing theorems for normal surfaces in positive characteristic2021

    • Author(s)
      榎園 誠
    • Organizer
      東大京大代数幾何学セミナー
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Extension theorem of morphisms from divisors on normal surfaces2021

    • Author(s)
      榎園 誠
    • Organizer
      Degenerations and models of algebraic varieties and related topics
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] An integral version of Zariski decompositions on normal surfaces2020

    • Author(s)
      榎園 誠
    • Organizer
      第22回代数曲面ワークショップZoom
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] Integral Zariski decomposition on normal surfaces and its applications2020

    • Author(s)
      榎園 誠
    • Organizer
      Kinosaki algebraic geometry symposium 2020
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] Durfee-type inequality for complete intersection surface singularities2020

    • Author(s)
      榎園 誠
    • Organizer
      特異点論月曜セミナー
    • Related Report
      2019 Research-status Report
  • [Presentation] On local signatures for holomorphic fibrations2019

    • Author(s)
      榎園 誠
    • Organizer
      Lefschetz Pencils and Low dimensional Topology
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Durfee-type inequality for complete intersection surface singularities2019

    • Author(s)
      榎園 誠
    • Organizer
      東大代数幾何学セミナー
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Slope inequality for fibered surfaces and Durfee's conjecture for surface singularities2019

    • Author(s)
      榎園 誠
    • Organizer
      第20回代数曲面ワークショップ at 秋葉原
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Durfee-type inequality for complete intersection surface singularities2019

    • Author(s)
      榎園 誠
    • Organizer
      Younger generations in Algebraic and Complex geometry VI
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Durfee-type inequality for complete intersection surface singularities2019

    • Author(s)
      榎園 誠
    • Organizer
      代数曲面論とその周辺
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Uniform bases for ideal arrangements2019

    • Author(s)
      榎園 誠
    • Organizer
      Hessenberg集会2019 in Osaka
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On local invariants for fibered surfaces2019

    • Author(s)
      榎園 誠
    • Organizer
      第17回代数曲線論シンポジウム
    • Related Report
      2019 Research-status Report
    • Invited

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Published: 2019-09-03   Modified: 2024-01-30  

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