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Research on topological models for combinatorial Hopf algebras

Research Project

Project/Area Number 18K03303
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 11020:Geometry-related
Research InstitutionOkayama University

Principal Investigator

Nakagawa Masaki  岡山大学, 教育学研究科, 准教授 (50370036)

Co-Investigator(Kenkyū-buntansha) 成瀬 弘  山梨大学, 大学院総合研究部, 教授 (20172596)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywordsトポロジー / 幾何 / 複素コボルディズム / シューベルト・カルキュラス / Schur S-, P, Q-関数 / Hall--Littlewood関数 / Gysin写像 / Schur S-, P-, Q-関数 / Hall-Littlewood関数 / Schubert Calculus / Schubert calculus / 旗多様体 / 一般コホモロジー / 対称関数 / 組合せ論
Outline of Final Research Achievements

(1) We generalized the Gysin formulas for flag bundles in the ordinary cohomology theory, which are due to Darondeau-Pragacz, to the complex cobordism theory. Then, we introduced the universal quadratic Schur functions, which are a generalization of the quadratic Schur functions introduced by Darondeau-Pragacz, and established some Gysin formulas for them as an application of our Gysin formulas. (2) We introduced a generalization of the ordinary Hall-Littlewood P- and Q-polynomials, which we called the universal factorial Hall-Littlewood P- and Q-functions, and characterized them in terms of our Gysin formulas in complex cobordism. As an application of our Gysin formulas in complex cobordism, we gave generating functions for the universal factorial Hall-Littlewood P- and Q-functions. Using our generating functions, classical determinantal and Pfaffian formulas for Schur S- and Q-polyomials, and their K-theoretic or factorial analogues can be obtained in a simple and unified manner.

Academic Significance and Societal Importance of the Research Achievements

通常のHall-Littlewood多項式はSchur S-多項式とSchur P, Q-多項式を補間する対称多項式であり,表現論や組合せ論において重要な役割を演じるものである。本研究の特色は,これを旗束のGysin写像を通して幾何的に捉えた点にある。幾何的・位相的な観点に立つことで,形式群を利用した幾何的にも意味のある拡張が可能となった。また,Darondeau-Pragaczの公式の複素コボルディズム版を利用することにより,拡張されたHall-Littlewood関数の母関数表示が得られ,Schur S, Q-多項式等の行列式公式やパフィアン公式を統一的な方法により導出することができる。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (5 results)

All 2019 2018

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (3 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Journal Article] On the mod 2 cohomology of the classifying space of the exceptional Lie group $E_{6}$2019

    • Author(s)
      Kameko Masaki、Nakagawa Masaki、Nishimoto Tetsu
    • Journal Title

      Proceedings of the Japan Academy, Series A, Mathematical Sciences

      Volume: 95 Issue: 9 Pages: 91-96

    • DOI

      10.3792/pjaa.95.91

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Universal Gysin formulas for the universal Hall-Littlewood functions2018

    • Author(s)
      Masaki Nakagawa and Hiroshi Naruse
    • Journal Title

      Contemporary Mathematics

      Volume: 708

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] Higher orientability of the Rosenfeld planes2019

    • Author(s)
      中川 征樹
    • Organizer
      香川セミナー
    • Related Report
      2019 Research-status Report
  • [Presentation] Gysin formulas for generalized Hall-Littlewood functions and related topics2019

    • Author(s)
      Masaki Nakagawa
    • Organizer
      New interactions between Geometry and Combinatorics (幾何学と組合せ論の新しい融合)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 複素コボルディズムにおけるDarondeau-Pragaczの公式2019

    • Author(s)
      中川 征樹, 成瀬 弘
    • Organizer
      2019年度日本数学会年会
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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