Updated on 2026/09/16

写真a

 
HAYASAKA Futoshi
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Professor
Position
Professor
External link

Degree

  • 博士(理学) ( 明治大学 )

Research Interests

  • local ring

  • graded ring

  • multiplicity

  • integral closure

  • module

  • Commutative Algebra

Research Areas

  • Natural Science / Algebra  / commutative ring theory

Education

  • Meiji University   理工学研究科   基礎理工学専攻

    2000.4 - 2005.3

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    Country: Japan

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Research History

  • 岡山大学環境生命自然科学学域 教授

    2023.4

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    Country:Japan

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  • 岡山大学環境生命科学学域 准教授

    2021.4 - 2023.3

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  • 岡山大学環境生命科学研究科 准教授

    2017.4 - 2021.3

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  • Hokkaido University of Education

    2013.4 - 2017.3

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  • Kagoshima National College of Technology

    2012.4 - 2013.3

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  • Kagoshima National College of Technology

    2010.4 - 2012.3

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Professional Memberships

 

Papers

  • Note on length and multiplicity of modules over two-dimensional regular local rings Reviewed International coauthorship International journal

    Futoshi Hayasaka, Vijay Kodiyalam

    Proceedings of the American Mathematical Society   154 ( 4 )   1421 - 1432   2026.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Mathematical Society (AMS)  

    We give lower and upper bounds on the Buchsbaum-Rim multiplicity of finitely generated torsion-free modules over two-dimensional regular local rings, and conditions for them to attain the bounds. As consequences, we have formulae on the multiplicity of integrally closed modules.

    DOI: 10.1090/proc/17552

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  • Indecomposable integrally closed modules of rank 3 over two-dimensional regular local rings Reviewed International coauthorship International journal

    Futoshi Hayasaka, Vijay Kodiyalam

    Journal of Pure and Applied Algebra   228 ( 6 )   Paper No. 107612, 18 pp.   2024.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.jpaa.2024.107612

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  • Note on indecomposable integrally closed modules of rank 2 over two-dimensional regular local rings Reviewed International coauthorship International journal

    Futoshi Hayasaka, Vijay Kodiyalam

    Journal of Commutative Algebra   15 ( 4 )   513 - 518   2023.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Rocky Mountain Mathematics Consortium  

    DOI: 10.1216/jca.2023.15.513

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  • Indecomposable integrally closed modules of arbitrary rank over a two-dimensional regular local ring Reviewed International journal

    Futoshi Hayasaka

    Journal of Pure and Applied Algebra   226 ( 8 )   Paper No. 107026, 26 pp.   2022.8

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.jpaa.2022.107026

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  • Constructing indecomposable integrally closed modules over a two-dimensional regular local ring Reviewed

    Futoshi Hayasaka

    Journal of Algebra   556   879 - 907   2020.8

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.jalgebra.2020.03.029

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  • A formula for the associated Buchsbaum-Rim multiplicities of a direct sum of cyclic modules II Reviewed

    Futoshi Hayasaka

    Communications in Algebra   47 ( 8 )   3250 - 3263   2019

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    Language:English   Publishing type:Research paper (scientific journal)  

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  • A formula for the associated Buchsbaum–Rim multiplicities of a direct sum of cyclic modules Reviewed

    Futoshi Hayasaka

    Journal of Pure and Applied Algebra   222 ( 11 )   3774 - 3783   2018.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier B.V.  

    DOI: 10.1016/j.jpaa.2018.02.006

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  • Asymptotic vanishing of homogeneous components of multigraded modules and its applications Reviewed

    Futoshi Hayasaka

    Journal of Algebra   513   1 - 26   2018

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  • A COMPUTATION OF BUCHSBAUM-RIM FUNCTIONS OF TWO VARIABLES IN A SPECIAL CASE Reviewed

    Futoshi Hayasaka

    ROCKY MOUNTAIN JOURNAL OF MATHEMATICS   46 ( 5 )   1547 - 1557   2016

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1216/RMJ-2016-46-5-1547

    Web of Science

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  • ASYMPTOTIC PERIODICITY OF PRIMES ASSOCIATED TO MULTIGRADED MODULES Reviewed

    Futoshi Hayasaka

    COMMUNICATIONS IN ALGEBRA   42 ( 6 )   2769 - 2778   2014.6

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1080/00927872.2013.774407

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  • ASYMPTOTIC PERIODICITY OF GRADE ASSOCIATED TO MULTIGRADED MODULES Reviewed

    Futoshi Hayasaka

    PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY   140 ( 7 )   2279 - 2284   2012.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1090/S0002-9939-2011-11370-4

    Web of Science

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  • On the Buchsbaum-Rim function of a parameter module Reviewed

    Futoshi Hayasaka, Eero Hyry

    JOURNAL OF ALGEBRA   327 ( 1 )   307 - 315   2011.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jalgebra.2010.09.035

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  • A NOTE ON THE BUCHSBAUM-RIM MULTIPLICITY OF A PARAMETER MODULE Reviewed

    Futoshi Hayasaka, Eero Hyry

    PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY   138 ( 2 )   545 - 551   2010.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1090/S0002-9939-09-10119-3

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  • On vanishing of certain Ext modules Reviewed

    Shiro Goto, Futoshi Hayasaka, Ryo Takahashi

    JOURNAL OF THE MATHEMATICAL SOCIETY OF JAPAN   60 ( 4 )   1045 - 1064   2008.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.2969/jmsj/06041045

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  • A Family of Graded Modules Associated to a Module Reviewed

    Futoshi Hayasaka, Eero Hyry

    COMMUNICATIONS IN ALGEBRA   36 ( 11 )   4201 - 4217   2008

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1080/00927870802177291

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  • Asymptotic stability of primes associated to homogeneous components of multigraded modules Reviewed

    Futoshi Hayasaka

    JOURNAL OF ALGEBRA   306 ( 2 )   535 - 543   2006.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jalgebra.2006.03.020

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  • Rees algebras of the second syzygy module of the residue field of a regular local ring Reviewed

    S. Goto, F. Hayasaka, K. Kurano, Y. Nakamura

    Contemporary Mathematics   390   97 - 108   2005

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    Language:English   Publishing type:Research paper (international conference proceedings)  

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  • The a-invariant and Gorensteinness of graded rings associated to filtrations of ideals in regular local rings Reviewed

    Shiro Goto, Futoshi Hayasaka, Shin-Ichiro Iai

    Proceedings of the American Mathematical Society   131 ( 1 )   87 - 94   2003.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1090/S0002-9939-02-06635-2

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  • Towards a theory of Gorenstein m-primary integrally closed ideals Reviewed

    S. Goto, F. Hayasaka, S. Kasuga

    COMMUTATIVE ALGEBRA, SINGULARITIES AND COMPUTER ALGEBRA   115   159 - 177   2003

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    Language:English   Publishing type:Research paper (international conference proceedings)  

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  • Finite homological dimension and primes associated to integrally closed ideals II Reviewed

    Shiro Goto, Futoshi Hayasaka

    J. Math. Kyoto Univ.   42 ( 4 )   631 - 639   2002

  • Finite homological dimension and primes associated to integrally closed ideals Reviewed

    S. Goto, F. Hayasaka

    PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY   130 ( 11 )   3159 - 3164   2002

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1090/S0002-9939-02-06436-5

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MISC

  • Modules of reduction number one

    Futoshi Hayasaka

    Preprint (math.AC/0612741)   2006

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    Language:English   Publishing type:Internal/External technical report, pre-print, etc.  

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Presentations

  • Towards a classification of integrally closed modules over two-dimensional regular local rings Invited International conference

    Futoshi Hayasaka

    The 12th Japan-Vietnam Joint Seminar on Commutative Algebra  2026.9.10 

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    Event date: 2026.9.8 - 2026.9.12

    Language:English   Presentation type:Oral presentation (general)  

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  • 2次元正則局所環上の位数2の整閉イデアルに付随する整閉加群について Invited

    早坂太

    東京可換環論セミナー  2025.3.28 

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    Event date: 2025.3.28

    Language:Japanese  

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  • Topics in integral closure of modules Invited International conference

    Futoshi Hayasaka

    2024.10.31 

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    Event date: 2024.10.29 - 2024.11.1

    Language:English   Presentation type:Oral presentation (invited, special)  

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  • 2次元正則局所環上の整閉加群(代数学特別講義III) Invited

    早坂太

    名古屋大学大学院多元数理科学研究科集中講義  2024.7.1 

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    Event date: 2024.7.5

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

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  • 位数2の整閉イデアルに付随する階数2の整閉加群

    早坂太

    第35回可換環論セミナー(徳島大)  2024.6.11 

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    Event date: 2024.6.10 - 2024.6.13

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 2次元正則局所環上の整閉加群の分類に向けて

    早坂太

    第2回札幌可換環論セミナー  2024.3.7 

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    Event date: 2024.3.7

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

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  • On ideals of indecomposable integrally closed modules over two-dimensional regular local rings

    Futoshi Hayasaka

    2022.11.18 

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    Event date: 2022.11.14 - 2022.11.18

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  • A note on the Buchsbaum-Rim multiplicity of modules over a two-dimensional regular local ring

    早坂太

    第42回可換環論シンポジウム  2021.11.21 

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    Event date: 2021.11.20 - 2021.11.22

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  • 単項式イデアルに付随する高階数直既約整閉加群 Invited

    早坂太

    可換環論オンラインワークショップ  2020.11.23 

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    Event date: 2020.11.21 - 2020.11.23

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  • 加群の重複度と長さに関する一注意

    早坂太

    霧島ミニシンポジウム  2025.10.31 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:国分パークプラザ  

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  • 多項式の割り算 -1変数から多変数へ- Invited

    早坂太

    令和7年度岡山県高教研数学部会美作支部研究会  2025.5.19 

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    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:岡山県立林野高等学校  

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  • 2次元正則局所環上の階数2の整閉加群の分類について Invited

    早坂太

    明治大学可換環論セミナー  2024.7.27 

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    Language:Japanese  

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  • On a question of Ratliff on the associated primes of powers of an ideal Invited

    早坂太

    OCAMI 可換環論・不変式論セミナー III  2024.1.12 

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  • An example to a question of Ratliff on asymptotic prime divisors

    Futoshi Hayasaka, Haruto Imamura

    2023.11.25 

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  • 直既約整閉加群に付随する行列式イデアルについて

    早坂太

    岡山可換代数表現セミナー  2023.4.24 

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    Language:Japanese  

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  • Ideals of indecomposable integrally closed modules over two-dimensional regular local rings Invited

    Futoshi Hayasaka

    The 11th Japan-Vietnam Joint seminar on Commutative Algebra, by and for young mathematicians  2023.3.30 

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  • 2次元正則局所環上の直既約整閉加群について Invited

    早坂太

    特異点セミナー  2022.7.25 

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  • 2次元正則局所環上の階数2の直既約整閉加群

    早坂太

    第33回可換環論セミナー  2022.6.16 

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  • 正則局所環上の加群の整閉包 Invited

    早坂 太

    日本数学会秋季分科会  2019.9.18 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

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  • Indecomposable integrally closed modules associated to complete monomial ideals Invited International conference

    早坂 太

    Special Session on Commutative Algebra and its Environs, 1147th AMS MEETING  2019.3.23 

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    Language:English   Presentation type:Oral presentation (invited, special)  

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  • 整閉単項式イデアルに付随する直既約整閉加群について Invited

    東大可換環論セミナー  2018.12.10 

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    Language:Japanese  

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  • Construction of indecomposable integrally closed modules over a two-dimensional regular local ring

    HAYASAKA Futoshi

    The 40th symposium on commutative algebra in Japan  2018.11.25 

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  • On constructiong integrally closed modules over a two-dimensional regular local ring Invited International conference

    Futoshi Hayasaka

    The 10th Japan-Vietnam Joint Seminar on Commutative Algebra  2018.9.14 

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    Language:English   Presentation type:Oral presentation (invited, special)  

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  • 2次元正則局所環の整閉イデアルに付随する整閉加群の構成

    第20回岡山可換代数表現セミナー  2018.6.11 

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    Language:Japanese  

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  • A note on constructing integrally closed modules over a two-dimensional regular local ring

    Mini-workshop on Commutative Algebra  2018.3.27 

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  • 多重次数付き加群の節減と単項式イデアルの整閉性

    日本数学会  2018.3.20 

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  • On the associated Buchsbaum-Rim multiplicities of a direct sum of cyclic modules

    第39回可換環論シンポジウム  2017.11.17 

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  • Existence of complete reductions and normality of monomial ideals

    第16回岡山可換代数表現セミナー  2017.4.20 

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  • On existence of complete and joint reductions of multigraded modules Invited International conference

    International Workshop on Commutative Algebra  2017.1.7 

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    Language:English   Presentation type:Oral presentation (invited, special)  

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  • Vanishing of homogeneous components and spread of multigraded modules

    第38回可換環論シンポジウム  2016.11.19 

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  • 巡回加群の直和の随伴ブックスバウム・リム重複度公式

    日本数学会  2016.9.16 

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  • Serre's conditions (S2) and (R1) Invited International conference

    The 2nd international school on commutative algebra at Thai Nguyen University  2016.6.9 

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  • The associated graded rings of ideals generated by regular sequences Invited International conference

    The 2nd international school on commutative algebra at Thai Nguyen University  2016.6.7 

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  • A formula for the associated Buchsbaum-Rim multiplicity of a direct sum of cyclic modules Invited International conference

    International conference and the 8th Japan-Vietnam Joint Seminar on Commutative Algebra  2016.3.25 

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    Language:English   Presentation type:Oral presentation (invited, special)  

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  • Computations of the associated Buchsbaum-Rim multiplicities of a direct sum of cyclic modules

    第37回可換環論シンポジウム  2015.11.20 

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  • Buchsbaum-Rim multiplicities of a direct sum of cyclic modules Invited

    第60回代数学シンポジウム  2015.8.31 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

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  • 加群の重複度と整閉包 Invited

    早坂 太

    明治大学大学院集中講義  2013.9 

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  • Buchsbaum-Rim multiplicity and its generalization Invited

    南九州代数系集会  2013.8 

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  • Asymptotic behavior of primes associated to multigraded modules Invited International conference

    The 7th Japan-Vitenam Joint Seminar on Commutative Algebra  2011.12 

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    Language:English   Presentation type:Oral presentation (invited, special)  

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  • 加群のブックスバウム・リム関数 Invited

    第141回数理情報科学談話会(鹿児島大学)  2010.7 

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    Language:Japanese  

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  • The Buchsbaum-Rim function of a parameter module Invited International conference

    The 5th Japan-Vietnam Joint Seminar on Commutative Algebra  2010.1 

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  • The Buchsbaum-Rim function of a parameter module

    早坂 太

    第42回環論および表現論シンポジウム  2009.10 

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  • The Buchsbaum-Rim function of a parameter module Invited

    早坂 太

    Summer seminar on ring theory  2009.6 

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  • On the Buchsbaum-Rim multiplicity of a parameter module Invited International conference

    The 4th Japan-Vietnam Joint Seminar on Commutative Algebra  2009.2 

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    Language:English   Presentation type:Oral presentation (invited, special)  

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  • A family of graded modules associated to a module Invited International conference

    International Conference in Commutative Algebra  2008.1 

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  • On certain graded modules associated to a module Invited International conference

    早坂 太

    The 3rd Japan-Vietnam Joint Seminar on Commutative Algebra  2007.12 

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    Language:English   Presentation type:Oral presentation (invited, special)  

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  • On modules of reduction number one International conference

    The 2nd Japan-Vietnam Joint Seminar on Commutative Algebra  2006.3 

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    Language:English  

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  • Modules of reduction number one International conference

    Nebraska Commutative Algebra Conference: WiegandFest  2005.5 

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  • 加群のRees環入門

    早坂 太

    第1回可換環論サマースクール  2004.1 

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  • Rees algebras of modules over a regular local ring Invited International conference

    Session for Young Researchers in Commutative Algebra and Algebraic Geometry  2003.12 

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    Language:English   Presentation type:Oral presentation (invited, special)  

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  • Rees algebras of the second syzygy modules Invited International conference

    Commutative Algebra and its Interaction with Algebraic Geometry  2003.6 

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    Language:English   Presentation type:Oral presentation (invited, special)  

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  • Finite homological dimension and primes associated to integrally closed ideals International conference

    Conference on Commutative Algebra 2001  2001.8 

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Research Projects

  • 局所環論への応用に向けた整閉加群の探究

    Grant number:23K03054  2023.04 - 2026.03

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    早坂 太

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    Grant amount:\3380000 ( Direct expense: \2600000 、 Indirect expense:\780000 )

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  • 整閉包の理論の新展開と局所環論への応用

    Grant number:20K03535  2020.04 - 2023.03

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    早坂 太

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    Grant amount:\3380000 ( Direct expense: \2600000 、 Indirect expense:\780000 )

    昨年度に引き続き、2次元正則局所環上の直既約整閉加群の遍在性に関する研究を行った。これまでの研究で、整閉な単項式イデアルに付随する直既約整閉加群の具体的構成法は得られていた。この構成法を手掛かりに、一般の(単項式イデアルとは限らない)整閉イデアルに付随する直既約整閉加群の構成に取り組んだ。単項式イデアルの場合の結果から、与えられた整閉イデアルに付随する直既約整閉加群で、階数がイデアルの位数よりも小さいものの存在を予想していたが、これを肯定的に証明した。証明(構成法)は、単項式イデアルの場合に得られていた方法を大幅に拡張するものである。昨年度の研究で得られていた「整閉加群とその行列式イデアルのcolengthの差の下限」に着目し、この下限をみたす整閉加群について詳しく調べた結果、与えられた一般の整閉イデアルに付随する整閉加群で、colengthの差が下限に一致するものが同型を除いて一意的に存在することがわかった。この加群を用いることで、上記予想を肯定的に解決したばかりでなく、階数がイデアルの位数に等しい直既約整閉加群の新しいクラスを得た。一方、整閉イデアルに付随する直既約整閉加群で、階数がイデアルの位数に一致するものの存在は一般には言えない。例えば、極大イデアルの2乗を行列式イデアルにもつ整閉加群は、極大イデアル2つの直和に限られる。この例の考察を大幅に一般化することで、階数2または3の直既約整閉加群の行列式イデアルとして現れる整閉イデアルの特徴付けを得た。これらの成果は全てKodiyalam氏と開始した共同研究の中で得られたものである。

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  • 次数付き環拡大に付随する関数と重複度の研究

    2012.04 - 2015.03

    科学技術研究費補助金  若手研究(B) 

    早坂 太

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    Authorship:Principal investigator  Grant type:Competitive

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  • A basic theory of the multiplicity of parameter modules over a local ring

    Grant number:22740027  2010.04 - 2012.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)

    HAYASAKA Futoshi

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    Authorship:Principal investigator  Grant type:Competitive

    We studied a basic theory of the multiplicity of parameter modules over a local ring, and clarified where the parts of the technical difficulty of the study, compared with the case of ideals, are. We also investigated the asymptotic property of the grade and the set of primes associated to homogeneous components of a nonstandard multigraded ring extension, and proved that the asymptotic periodicity occurs in a cone.

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