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On embedded resolution of singularities for three dimensional algebraic varieties

Research Project

Project/Area Number 20K03546
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 11010:Algebra-related
Research InstitutionChubu University

Principal Investigator

Kawanoue Hiraku  中部大学, 理工学部, 准教授 (50467445)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2023: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords特異点解消 / IFP / 代数幾何学 / 正標数
Outline of Research at the Start

本研究の主題は特異点解消である. これは代数幾何学における最重要問題の一つであるが, 正標数の場合は未だに3次元非埋め込みの場合までしか解明されておらず任意次元の解決は積年の懸案である. 本研究はその第一歩である正標数3次元埋め込み特異点解消の解決を目標とする.
本研究は応募者が提唱しパーデュー大学の松木氏と共同で発展させている Idealistic Filtration Program (IFP) に沿って進める. 既に曲面の場合はIFPを使った埋め込み特異点解消が得られているので, その際の解析や観察を一般化してIFPを発展させる形での3次元の場合の解決を目指す.

Outline of Final Research Achievements

Resolution of singularities is one of the very important problems in algebraic geometry. Existence of resolution in characteristic zero was established by Hironaka in any dimension, while that in positive characteristic is known only for low dimensional cases. To settle this problem, I introduced the approach called IFP, and work on it jointly with Kenji Matsuki in Purdue university. The theme of this project is to establish the existence of embedded resolution of three dimensional varieties, which is still open. We analyzed so-called "monomial cases", which comes as the most essential case after some reduction argument, and obtained some partial results such as giving the invariants in some cases and observing the transitional behavior of them. We also have some results in the area related to the main topic of our project, such as the theory of hyperplane arrangement or the theory of differential equations in positive characteristic.

Academic Significance and Societal Importance of the Research Achievements

代表者が提案し推進しているIFPというアプローチを用いて3次元多様体の埋め込み特異点解消について解析した.幾つかの場合の解析が終わるなど部分的成果が得られた.IFPの一定の有効性が示された一方で,3次元抽象特異点解消(解決済)と3次元埋め込み特異点解消(未解決)の差が想像以上に大きいことも明らかになった.曲面の埋め込み特異点解消についてはこの間の研究でより良い理解を得られたと言える.近縁の問題についての幾つかの成果も意義がある.B_2型拡大カタラン配置に関する予想の解決はB_n型一般の場合に道を拓く結果である.また正標数の線形微分方程式の解の記述はかなり発展性のある話題であると感じている.

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (5 results)

All 2024 2023

All Presentation (4 results) (of which Int'l Joint Research: 2 results,  Invited: 3 results) Funded Workshop (1 results)

  • [Presentation] Exponential in characteristic $p>0$2024

    • Author(s)
      Hiraku Kawanoue
    • Organizer
      Differential Equations in Zero and Positive Characteristic
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A basis for the logarithmic vector field of the extended Catalan arrangement of type B_22024

    • Author(s)
      川ノ上 帆
    • Organizer
      Multiarrangements of type $B_2$ and related topics
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] An exponential function in positive characteristic2023

    • Author(s)
      Hiraku Kawanoue
    • Organizer
      Algebraicity Problems in Geometry, Analysis and Number Theory
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] A basis for the logarithmic vector field of the extended Catalan arrangement of type B_22023

    • Author(s)
      川ノ上 帆
    • Organizer
      湯布院代数幾何学ワークショップ
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Funded Workshop] Algebraicity Problems in Geometry, Analysis and Number Theory2023

    • Related Report
      2023 Annual Research Report

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Published: 2020-04-28   Modified: 2025-01-30  

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