Talks

1. Normality of monomial ideals in three variables , 明治大学可換環論セミナー, 神奈川, 20 Jun 2026.
2. 数値半群環の定義イデアルとその応用 , 可換代数と組合せ論セミナー, 千葉, 6 Jun 2026.
3. Stretched semigroup rings and 2-minor generation in defining ideals (joint with Kazufumi Eto, Takahiro Numata, Kei-ichi Watanabe) , 第46回可換環論シンポジウム, 大阪, 21 Nov 2025.
4. 3変数多項式環の単項式イデアルの正規性について , Commutative Algebra Days in Kirishima, 鹿児島, 31 Oct 2025.
5. An upper bound for the Frobenius number and stretched numerical semigroups (joint with Kazufumi Eto, Takahiro Numata, Kei-ichi Watanabe) , 第45回可換環論シンポジウム, 京都, 21 Nov 2024.
6. Numerical semigroup rings -- A foundation of combinatorial perspective on commutative algebra , Interactions of Commutative Algebra, Representation Theory, and Combinatorics in Bangkok, Bangkok (Thailand), 30 Oct 2024.
7. Nearly Gorenstein local rings defined by maximal minors of a $2 \times n$ matrix , International Meeting on Numerical Semigroups 2024, Jerez de la Frontera (Spain), 11 Jul 2024.
8. 1次元解析を基盤とした局所環論 , 第68回代数学シンポジウム, 名古屋, 30 Aug 2023.
9. Numerical semigroup rings with determinantal defining ideals , One day workshop on Commutative Algebra, Tokyo (Japan), 6 Feb 2023.
10. Ulrich ideals in numerical semigroup rings , 東京可換環論セミナー, オンライン, 12 Oct 2021.
11. Efficient generation of ideals in core subalgebras of the polynomial ring k[t] over a field k , The 8th China–Japan–Korea International Symposium on Ring Theory, Nagoya (Japan), 27 Aug 2019.
12. The GGL property of numerical semigroup rings obtained by gluing , The 10th Japan-Vietnam Joint Seminar on Commutative Algebra, Hanoi (Vietnam), 11 Sep 2018.
13. The generalized Gorenstein property and numerical semigroup rings obtained by gluing , INdAM Meeting: International Meeting on Numerical Semigroups, Cortona (Italy), 6 Sep 2018.
14. Pseudo-Frobenius numbers versus defining ideals in numerical semigroup rings , 第39回可換環論シンポジウム, 京都, Nov 2017.
15. Pseudo-Frobenius numbers versus defining ideals in numerical semigroup rings , International Conference on Commutative Algebra and its Interactions to Combinatorics, Discrete Geometry and Singularity Theory, Hanoi (Vietnam), Sep 2017.
16. Pseudo-Frobenius numbers and the generation of the defining ideal , 第28回可換環論セミナー, 山口, Feb 2017.
17. The minimal free resolution of a numerical semigroup ring with arithmetic pseudo-Frobenius numbers of type 3 , Japan-Vietnam Workshop on Commutative Algebra 2016 - by and for young mathematicians -, Kawasaki (Japan), Sep 2016.
18. On the almost Gorenstein property in Rees algebras of contracted ideals , The 8th Japan-Vietnam Joint Seminar on Commutative Algebra, Hanoi (Vietnam), Mar 2016.
19. The almost Gorenstein Rees algebras of contracted ideals (joint with Shiro Goto, Naoki Taniguchi, Ken-ichi Yoshida) , 2016年日本数学会年会, つくば, Mar 2016.
20. Minimal free resolutions of certain almost Gorenstein numerical semigroup rings , Workshop on Commutative Algebra, Ha Long (Vietnam), Jan 2016.
21. The almost Gorenstenness of Rees algebras of contracted ideals in 2-dimensional regular local rings , The JV Seminar on Commutative Algebra - by and for young mathematicians -, Kawasaki (Japan), Sep 2015.
22. The almost Gorenstein Rees algebras of socle ideals (joint with Shiro Goto, Naoki Taniguchi, Ken-ichi Yoshida) , 2015年日本数学会秋季年会, 京都, Sep 2015.
23. 2次元正規特異点のpg-idealのRees代数のAlmost Gorenstein性 (joint with Shiro Goto, Naoki Taniguchi, Ken-ichi Yoshida) , 2015年日本数学会秋季年会, 京都, Sep 2015.
24. Almost Gorenstein rings , INdAM Meeting: International Meeting on Numerical Semigroups, Cortona (Italy), Sep 2014.
25. Applications of one-dimensional almost Gorenstein rings , 第8回大和郡山セミナー, 大和郡山, Jan 2012.
26. Basic properties of one-dimensional almost Gorenstein rings , 第8回大和郡山セミナー, 大和郡山, Jan 2012.
27. Almost Gorenstein rings — One dimensional case , The 7th Japan-Vietnam Joint Seminar on Commutative Algebra, Quy Nhon (Vietnam), Dec 2011.
28. Almost Gorenstein rings (joint with Shiro Goto, Tran Thi Phuong) , 第33回可換環論シンポジウム, 浜松, Nov 2011.
29. Almost Gorenstein rings , 第6回大和郡山セミナー, 大和郡山, Aug 2011.
30. 2変数単項式イデアルのRatliff-Rush閉包について , 第2回大和郡山セミナー, 大和郡山, Oct 2010.
31. Divisor class groups of algebras of minors , 第7回可換環論サマースクール, 東京, Aug 2010.
32. ASL structure and determinantal ideals , 第7回可換環論サマースクール, 東京, Aug 2010.
33. Quasi-socle ideals in Gorenstein numerical semigroup rings (joint with Shiro Goto, Satoru Kimura) , 2008年日本数学会年会, 東京, Mar 2008.
34. Quasi-socle ideals in local rings with Gorenstein tangent cones (joint with Shiro Goto, Satoru Kimura) , 2008年日本数学会年会, 東京, Mar 2008.
35. Quasi-socle ideals in a Gorenstein local ring , The 3rd Japan-Vietnam Joint Seminar on Commutative Algebra, Hanoi (Vietnam), Dec 2007.
36. Quasi-socle ideals in local rings with Gorenstein tangent cones (joint with Shiro Goto, Satoru Kimura, Tran Thi Phuong) , 第29回可換環論シンポジウム, 名古屋, Nov 2007.
37. Quasi-socle ideals in a Gorenstein local ring (joint with Shiro Goto, Ryo Takahashi) , 2007年日本数学会秋季年会, 仙台, Sep 2007.
38. Quasi-socle ideals in a Gorenstein local ring , 第19回可換環論セミナー, 福岡, Jan 2007.
39. Macaulay2によるfree resolutionの計算 , 第3回可換環論サマースクール, 東京, Sep 2006.
40. The Rees algebras of ideals in two dimensional regular local rings (joint with Shiro Goto) , 2006年日本数学会年会, 東京, Mar 2006.
41. The Rees algebras of ideals in two dimensional regular local rings , The 2nd Japan-Vietnam Joint Seminar on Commutative Algebra, 川崎, Mar 2006.
42. The Rees algebras of ideals in two dimensional regular local rings, II , 第18回可換環論セミナー, 札幌, Jan 2006.
43. The Rees algebras of ideals in two dimensional regular local ring (joint with Shiro Goto) , 第27回可換環論シンポジウム, 富山, Nov 2005.
44. 2次元単項式イデアルのRatliff-Rush閉包とRees代数のBuchsbaum性について , 2005年日本数学会秋季年会, 岡山, Sep 2005.
45. Ratliff-Rush closures of certain 2-dimensional monomial ideals and Buchsbaumness of its Rees algebras , Nebraska Commutative Algebra Conference: WiegandFest, Nebraska (USA), May 2005.
46. 2次元単項式イデアルのRatliff-Rush閉包とRees代数のBuchsbaum性について , 第10回代数学若手研究集会, 松本, Mar 2005.
47. 単項式イデアルのRatliff-Rush閉包について , 第17回可換環論セミナー, 京都, Jan 2005.
48. 単項式イデアルのRatliff-Rush閉包について , 第26回可換環論シンポジウム, 倉敷, Nov 2004.
49. 巴系イデアルの冪の整閉性と局所環の正則性について , 第16回可換環論セミナー, 東京, Jan 2004.