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Study on projective varieties with Frobenius maps

Research Project

Project/Area Number 16K17581
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Algebra
Research InstitutionInstitute of Physical and Chemical Research (2017-2018)
Kyoto University (2016)

Principal Investigator

Sannai Akiyoshi  国立研究開発法人理化学研究所, 革新知能統合研究センター, 研究員 (10610595)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsアーベル多様体 / フロベニウス写像 / シンボリックリース環 / 深層学習 / 対称群 / 多項式 / 多目的最適化 / ベジェ曲線 / グラフ理論 / 普遍近似定理 / globally F-regular / Fano type
Outline of Final Research Achievements

Two research papers have been published or accepted, and three papers have been published as preprints. The contents are advanced researches on the characterization of Abelian varieties in Sannai-Tanaka. In the previous result, the part which needed to check the infinite number of Frobenius pushforward. It was possible to improve to a sharper result (once or twice (characteristic 2)) . We also constructed a counterexample of the commutative ring theory problem called the Cowsik problem using algebraic geometric methods. Other than that, I did research on deep learning with algebraic methods. As a result, a kind of theorem called universal approximation theorem is proved in the case with group operation.

Academic Significance and Societal Importance of the Research Achievements

アーベル多様体は古くから研究されてきた重要な数学的対象物であり、その特徴付けを新たな視点で行えたことには学術的な意義がある。またCowsikの問題も古くから考えられてきた未解決問題でありその解決は意味は疑いようもない。最後に近年社会的に有用であることが証明されつつある深層学習において群論や代数幾何、表現論を用いて成果をあげられたことはその結果自体のみならず数学という学問や、日本の国際社会での存在感を高めることに貢献できたと考えている。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (10 results)

All 2019 2018 2017 2016 Other

All Int'l Joint Research (1 results) Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 1 results,  Acknowledgement Compliant: 1 results) Presentation (7 results) (of which Int'l Joint Research: 2 results,  Invited: 4 results)

  • [Int'l Joint Research] ENS Paris-Saclay(フランス)

    • Related Report
      2018 Annual Research Report
  • [Journal Article] A Characterization of Ordinary Abelian Varieties by the Frobenius Push-Forward of the Structure Sheaf II2018

    • Author(s)
      Sho Ejiri, Akiyoshi Sannai
    • Journal Title

      International Mathematics Research Notices

      Volume: 288

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] A characterization of ordinary abelian varieties by the Frobenius push-forward of the structure sheaf2016

    • Author(s)
      Sannai Akiyoshi, Tanaka Hiromu
    • Journal Title

      Mathematische Annalen

      Volume: 366 Issue: 3-4 Pages: 1067-1087

    • DOI

      10.1007/s00208-015-1352-3

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Presentation] Bezier Simplex Fitting: Describing Pareto Fronts of Simplicial Problems with Small Samples in Multi-objective Optimization2019

    • Author(s)
      Ken Kobayashi, Naoki Hamada, Akiyoshi Sannai, Akinori Tanaka, Kenichi Bannai, Masashi Sugiyama
    • Organizer
      The Thirty-Third AAAI Conference on Artificial Intelligence
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Asymptotic Risk of Bezier Simplex Fitting2019

    • Author(s)
      Akinori Tanaka, Akiyoshi Sannai, Ken Kobayashi, Naoki Hamada
    • Organizer
      International Conference on Compute and Data Analysis
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 正標数のアーベル多様体の特徴付けについて2017

    • Author(s)
      三内顕義
    • Organizer
      農工大数学セミナー2017
    • Place of Presentation
      東京農工大学
    • Year and Date
      2017-03-21
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] Abelian varieties in positive characteristic2017

    • Author(s)
      三内顕義
    • Organizer
      The 2nd Higher dimensional algebraic geometry Echigo Yuzawa sympos ium
    • Place of Presentation
      越後湯沢公民館
    • Year and Date
      2017-02-14
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] Frobenius maps and algebraic varieties2017

    • Author(s)
      三内顕義
    • Organizer
      代数幾何学シンポジウム
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] decomposability of Frobenius push-forward of structure sheaves2016

    • Author(s)
      三内顕義
    • Organizer
      都の西北代数幾何学シンポジウム
    • Place of Presentation
      早稲田大学
    • Year and Date
      2016-11-16
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] Frobenius methods in algebraic geometry2016

    • Author(s)
      三内顕義
    • Organizer
      京都大学代数幾何学セミナー
    • Place of Presentation
      京都大学
    • Year and Date
      2016-07-08
    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2020-03-30  

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