Shinya Kumashiro

Email:
shinya.kumashiro  "at"  oit.ac.jp
shinyakumashiro  "at"  gmail.com
Affiliation:
Osaka Institute of Technology

Talks

2026

  1. On partial trace ideals Mini-Workshop on Commutative Algebra (Thai Nguyen, Vietnam), 26 August
  2. 擬フロベニウス数のある加法的性質について 岡山可換代数表現セミナー (OSCAR) (Okayama, Japan), 18 August
  3. Canonical traces of graded fiber products: applications to disconnected Stanley--Reisner rings MSJ Spring Meeting 2026 at Tokyo University of Science (Tokyo, Japan), 23-26 March

2025

  1. Canonical traces of graded fiber products: applications to disconnected Stanley-Reisner rings 第２回新潟若手代数・幾何シンポジウム (Niigata, Japan), 26-29 November
  2. A note on modules with minimal multiplicity The 46th Japan Symposium on Commutative Algebra (Osaka, Japan), 20-24 November
  3. On partial trace ideals 東京可換環論セミナー (online), 30 October
  4. 局所環のHilbert関数解析 第29回代数学若手研究会 (Osaka, Japan), 11 March - 14 March

2024

  1. Traces of semi-invariants Interactions of Commutative algebra, Representation theory, and Combinatorics in Bangkok (Bangkok, Thailand), 29 October - 1 November
  2. fiber coneのHilbert関数について 東京可換環論セミナー (online), 4 October
  3. When are trace ideals finite? 日本数学会2024年度秋季総合分科会 (Osaka, Japan), 3-6 September

2023

  1. Graded filtrations and ideals of reduction number two Mini workshop on commutative algebra (Thai Nguyen, Vietnam), 21 September
  2. Rings having a finite number of trace ideals The 28th National School on Algebra (Bucharest, Romania), 24-28 June
  3. Study on Z_2 graded rings Workshop The 11th Japan-Vietnam Joint seminar on Commutative Algebra, by and for young mathematicians (Hanoi, Vietnam), 28-30 March

2022

  1. 正準加群のトレースのcolengthの上限 日本数学会2022年度秋季総合分科会 (Hokkaido, Japan), 13-16 September
  2. Certain monomial ideals whose numbers of generators of powers descend 第3回情報数理セミナー (Ibaraki, Japan), 17-19 August
  3. 次数付フィルトレーションと節減数2のイデアル 日本数学会2022年度年会 (online), 28 March
  4. When are trace ideals finite? 第2回情報数理セミナー (Tochigi, Japan), 5-7 March
  5. Graded Bourbaki ideals of graded modules and Ideals of reduction number two Virtual Commutative Algebra Seminars (online), 28 January

2021

  1. Graded filtrations and ideals of reduction number two 第42回可換環論シンポジウム (online), 20-23 November
  2. Graded filtrations and ideals of reduction number two 第1回情報数理セミナー (Tochigi, Japan), 23-24 October
  3. Graded Bourbaki ideals of graded modules オンライン可換環論セミナー2021 (online), 26-27 June and 10-11 July
  4. 節減数２のイデアルのHilbert関数挙動 日本数学会2021年度年会 (online), 15-18 March
  5. 節減数２のイデアルのHilbert関数挙動 The 17th Mathematics Conference for Young Researchers (online), 2-5 March

2020

  1. Ideals of reduction number two 可換環論オンラインワークショップ (online), 21-23 November
  2. The Auslander-Reiten conjecture for certain non-Gorenstein Cohen-Macaulay rings 2020 AMS Fall Virtual Sectional Meetings, Special Session on Homological Methods in Algebra (online), 3-4 October
  3. The Auslander-Reiten conjecture for certain non-Gorenstein Cohen-Macaulay rings (research talk) WVU Algebra Seminar via Zoom (online), 12 September
  4. The Auslander-Reiten conjecture for certain non-Gorenstein Cohen-Macaulay rings (introductory talk) WVU Algebra Seminar via Zoom (online), 5 September
  5. Graded Bourbaki ideals of graded modules 東京可換環論セミナー (online), 22 June
  6. Hilbert coefficients of ideals whose reduction numbers are two Seminarul de Algebră Comutativă Nicolae Radu (Bucharest, Romania), 4 February

2019

  1. 非Gorenstein環におけるAuslander-Reiten予想 MSJ Autumn Meeting 2019, at Kanazawa University (Ishikawa, Japan), 17-20 September
  2. The Auslander-Reiten conjecture for non-Gorenstein rings The 8th China - Japan - Korea International Symposium on Ring Theory (Aichi, Japan), 26-31 August
  3. Local cohomology of affine semigroup rings, part 2 第16回可換環論サマースクール (Chiba, Japan), 5-8 August
  4. Local cohomology of affine semigroup rings, part 1 第16回可換環論サマースクール (Chiba, Japan), 5-8 August
  5. Auslander-Reiten予想とUlrichイデアル 第32回可換環論セミナー (Aomori, Japan), 27-30 June
  6. The Auslander-Reiten conjecture for non-Gorenstein Cohen-Macaulay rings Conference on Commutative Algebra and its Interaction with Algebraic Geometry In Honor of Bernd Ulrich (Indiana, USA), 16-21 June
  7. イデアル化のCohen-Macaulay型とresidually faithful加群について The 15th Mathematics Conference for Young Researchers (Hokkaido, Japan), 4-7 March
  8. Residually faithful modules and the Cohen-Macaulay type of idealizations 第24回代数学若手研究会 (Tokyo, Japan), 18-21 February
  9. Residually faithful modules and the Cohen-Macaulay type of idealizations A Mini-Workshop on Commutative Algebra (Thai Nguyen, Vietnam), 6 January

2018

  1. The structure of chains of Ulrich ideals in Cohen-Macaulay local rings of dimension one The 40th Japan Symposium on Commutative Algebra (Kanagawa, Japan), 22-26 November
  2. Residually faithful modules and the Cohen-Macaulay type of idealizations The 40th Japan Symposium on Commutative Algebra (Kanagawa, Japan), 22-26 November
  3. トレース加群からみたGorenstein性の解析 MSJ Autumn Meeting 2018, at Okayama University (Okayama, Japan), 24-27 September
  4. The structure of chains of Ulrich ideals in Cohen-Macaulay local rings of dimension one MSJ Autumn Meeting 2018, at Okayama University (Okayama, Japan), 24-27 September
  5. Some categories of maximal Cohen-Macaulay modules and idealizations The 10th Japan-Vietnam joint seminar on commutative algebra (Hue, Vietnam), 10-14 September
  6. Infinite free resolutions, part 2 第15回可換環論サマースクール (Aichi, Japan), 27-30 August
  7. Infinite free resolutions, part 1 第15回可換環論サマースクール (Aichi, Japan), 27-30 August
  8. トレースイデアルを用いたゴレンシュタイン性の解析 Ⅱ 第25回大和郡山セミナー (Nara, Japan), 2-3 July
  9. トレースイデアルを用いたゴレンシュタイン性の解析 Ⅰ 第25回大和郡山セミナー (Nara, Japan), 2-3 July
  10. Residually faithful modules and the Cohen-Macaulay type of idealizations 第31回可換環論セミナー (Kyoto, Japan), 27-30 June
  11. On GGL rings Mini-workshop on Commutative Algebra –by and for young mathematicians- (Hokkaido, Japan), 26-28 March
  12. Characterization of generalized Gorenstein rings MSJ Spring Meeting 2018 at The University of Tokyo (Tokyo, Japan), 18-21 March
  13. イデアル化R⋉Iのalmost Gorenstein性 MSJ Spring Meeting 2018 at The University of Tokyo (Tokyo, Japan), 18-21 March
  14. A characterization of the Gorenstein property in terms of trace ideals 第23回代数学若手研究会 (Osaka, Japan), 5-8 March
  15. A characterization of the Gorenstein property in terms of trace ideals 第30回可換環論セミナー (Hokkaido, Japan), 31 January -2 February
  16. A characterization of the Gorenstein property in terms of trace ideals International workshop on commutative algebra by and for young mathematicians (Thai Nguyen, Vietnam), 17-21 January

2017

  1. Ubiquity of Ulrich ideals in dimension one The 39th Japan Symposium on Commutative Algebra (Kyoto, Japan), 13-17 November
  2. Ulrich ideals and G-regular rings The 39th Japan Symposium on Commutative Algebra (Kyoto, Japan), 13-17 November
  3. Ulrich ideals and GGL rings in dimension one International Conference on Commutative Algebra and its Interaction to Combinatorics, Discrete Geometry and Singularity Theory (Hanoi and Ha Long, Vietnam), 11-15 September
  4. Ulrich ideals and GGL rings in dimension one International School and workshop on commutative algebra (Ho Chi Minh, Vietnam), 5-8 September
  5. Sally modules of rank one 第14回可換環論サマースクール (Kanagawa, Japan), 21-24 August
  6. Gorenstein property of Rees algebras 第14回可換環論サマースクール (Kanagawa, Japan), 21-24 August
  7. On generalized Gorenstein local rings 明治大学可換環論セミナー (Kanagawa, Japan), 8 April
  8. First Hilbert coefficients International workshop on commutative algebra (Thai Nguyen, Vietnam), 4-7 January

2016

  1. A minimal free resolution and type The 2nd International School on Commutative Algebra at Thai Nguyen University (Thai Nguyen, Vietnam), 5-11 June
  2. Numerical semigroup rings The 2nd International School on Commutative Algebra at Thai Nguyen University (Thai Nguyen, Vietnam), 5-11 June