Talks

*: English translation (the original title is in Japanese)
**: Speaker

[ plan ]

Norm one tori and Hasse norm principle, III: Degree 16 case,
Niigata Algebra Seminar (Prof. Hideo Kojima and Takeshi Takahashi), Niigata Univ., Nov. 18, 2024 Web (Japanese)
Norm one tori and Hasse norm principle, III: Degree 16 case,
The 8th Workshop on Algebraic Geometry -Ube-, National Institute of Technology, Ube College, Jan. 11-12, 2025 Web

[ 2024 ]

Rationality problem of two-dimensional quasi-monomial group actions,
The 22nd Affine Algebraic Geometry Meeting (Prof. Takashi Kishimoto, Hideo Kojima and Adrien Dubouloz), Niigata Univ., Mar. 2, 2024 Web
(with Aiichi Yamasaki**) Birational classification for algebraic tori (II),
Spring Meeting of the Mathematical Society of Japan, Osaka Metropolitan Univ., Mar. 19, 2024 Web
(with Hidetaka Kitayama**) Rationality problem of two-dimensional quasi-monomial group actions,
Spring Meeting of the Mathematical Society of Japan, Osaka Metropolitan Univ., Mar. 19, 2024 Web
(with Aiichi Yamasaki) Rationality problem for norm one tori for dihedral extensions,
Spring Meeting of the Mathematical Society of Japan, Osaka Metropolitan Univ., Mar. 19, 2024 Web
(with Aiichi Yamasaki) Rationality problem for norm one tori for $A_5$ and $PSL_2(F_8)$ extensions,
Spring Meeting of the Mathematical Society of Japan, Osaka Metropolitan Univ., Mar. 19, 2024 Web
(with Kazuki Kanai, Aiichi Yamasaki) Norm one tori and Hasse norm principle, III: Degree 16 case,
Autumn Meeting of the Mathematical Society of Japan, Osaka Univ., Sep. 5, 2024 Web
Birational classification for algebraic tori,
Kinosaki algebraic geometry symposium 2024 (Prof. Yohsuke Matsuzawa, Yusuke Nakamura, Kazuhiko Yamaki), Kyoto Univeristy, Oct. 2024 Web
Norm one tori and Hasse norm principle,
Bath Arithmetic Geometry Seminar (Prof. Daniel Loughran, Elyes Boughattas, Julian Demeio, Harry Shaw), University of Bath, the United Kingdom, Nov. 5, 2024 Web
Norm one tori and Hasse norm principle,
London Number Theory Seminar (Prof. Ana Caraiani, George Boxer, Kalyani Kansal), Imperial College London, the United Kingdom, Nov. 6, 2024 Web

[ 2023 ]

Birational classification for algebraic tori,
Yufuin Workshop on Algebraic Geometry (Prof. Masamichi Kuroda, Taketo Shirane, Kentaro Mitsui and Kazuhiko Yamaki), Nippon Bunri Univ., Feb. 16, 2023 Web (Japanese)
(with Aiichi Yamasaki) Birational classification for algebraic tori (I),
Spring Meeting of the Mathematical Society of Japan, Chuo Univ., Mar. 17, 2023 Web
(with Kazuki Kanai**, Aiichi Yamasaki) Hasse norm principle for $M_{11}$ extensions,
Spring Meeting of the Mathematical Society of Japan, Chuo Univ., Mar. 18, 2023 Web
Rationality problem for norm one tori for dihedral extensions,
Niigata Algebra Seminar (Prof. Hideo Kojima and Takeshi Takahashi), Niigata Univ., Jun. 30, 2023 Web (Japanese)
Norm one tori and Hasse norm principle,
The 68th Algebra Symposium (Prof. Tomokazu Kashio and Yoshinori Yamasaki), Nagoya Univ., Sep. 1, 2023 Web (Japanese)
Norm one tori and Hasse norm principle,
Ehime University Algebra Seminar (Prof. Miki Hirano), Ehime Univ., Dec. 1, 2023 Web (Japanese)
Birational classification for algebraic tori,
Niigata Algebra Symposium (Prof. Kenta Hashizume, Hideo Kojima, Takuzo Okada and Kazuhiko Yamaki), Niigata Univ., Dec. 6, 2023 Web

[ 2022 ]

Birational classification for algebraic tori (I),
Niigata Algebra Seminar (Prof. Hideo Kojima and Takeshi Takahashi), Niigata Univ., Apr. 22, 2022 Web (Japanese)
Birational classification for algebraic tori (III),
Niigata Algebra Seminar (Prof. Hideo Kojima and Takeshi Takahashi), Niigata Univ., May 27, 2022 Web (Japanese)
Hasse norm principle for $M_{11}$ extensions,
Niigata Algebra Seminar (Prof. Hideo Kojima and Takeshi Takahashi), Niigata Univ., Nov. 25, 2022 Web (Japanese)

[ 2021 ]

Rationality problem for fields of invariants,
Degenerations and models of algebraic varieties and related topics (Prof. Kentaro Mitsui, Ryo Ohkawa, Masa-Hiko Saito and Taro Sano), Zoom (Kobe), Feb. 16, 2021 Web
Rationality problem for fields of invariants,
Homotopic and Geometric Galois Theory (Prof. Benjamin Collas, Pierre Debes, Hiroaki Nakamura and Jakob Stix), Zoom (Oberwolfach), Mar. 9, 2021 Web
(with Kazuki Kanai**) Davenport and Hasse's theorems and lifts of multiplication matrices of Gaussian periods,
Autumn Meeting of the Mathematical Society of Japan, Zoom (Chiba), Sep. 17, 2021 Web (Japanese)
Rationality problem for fields of invariants,
Colloquium of Dept. of Math., Meijo Univ. (Prof. Yoshihiro Onishi and Tetsuya Uematsu), Zoom (Meijo), Dec. 22, 2021

[ 2020 ]

Degree three unramified cohomology groups and Noether's problem for groups of order 243,
The 15th Polynomial Ring Theory Seminar (Prof. Shigeru Kuroda and Ryuji Tanimoto), Shizuoka Univ., Feb. 14, 2020
(with Kazuki Kanai, Aiichi Yamasaki) Norm one tori and Hasse norm principle,
Spring Meeting of the Mathematical Society of Japan, Nihon Univ., Mar. 19, 2020 Web (Japanese)
(with Kazuki Kanai, Aiichi Yamasaki**) Norm one tori and Hasse norm principle, II,
Spring Meeting of the Mathematical Society of Japan, Nihon Univ,, Mar. 19, 2020 Web (Japanese)
Rationality problem for fields of invariants,
The 18th Symposium on Algebraic Curves (Prof. Akira Ohbuchi), Zoom (Tokushima), Dec. 18, 2020 Web (Japanese)

[ 2019 ]

(with Ming-chang Kang, Aiichi Yamasaki) Noether's problem for $N\rtimes A_6$,
Spring Meeting of the Mathematical Society of Japan, Tokyo Institute of Technology, Mar. 20, 2019 Web (Japanese)
(with Aiichi Yamasaki) Rationality problem for norm one tori,
Spring Meeting of the Mathematical Society of Japan, Tokyo Institute of Technology, Mar. 20, 2019 Web (Japanese)
(with Sumito Hasegawa, Aiichi Yamasaki**) Rationality problem for norm one tori, II,
Spring Meeting of the Mathematical Society of Japan, Tokyo Institute of Technology, Mar. 20, 2019 Web (Japanese)
Rationality problem for algebraic tori,
Niigata Algebra Seminar (Prof. Hideo Kojima and Takeshi Takahashi), Niigata Univ., Jun. 21, 2019 Web (Japanese)
Degree three unramified cohomology groups and Noether's problem for groups of order 243,
Conference: Commutative Banach Algebra and Related Topics (the 93th Yonezawa Sugaku Seminar) (Prof. Takeshi Miura and Takahiro Hayata), Yamagata Univ., Jun. 29, 2019
Degree three unramified cohomology groups and Noether's problem for groups of order 243,
NCTS Seminar on Algebra (Prof. Ming-chang Kang), NCTS, National Taiwan Univ., Taiwan, Aug. 12, 2019 Web
Quasi-monomial actions and rationality problem*,
The 27th Summer School on Number Theory (Prof. Toru Komatsu and Hidetaka Kitayama), Tohoku University of Community Service and Science, Koeki Hall, Sep. 7, 2019 Web (Japanese)
Degree three unramified cohomology groups and Noether's problem*,
The 27th Summer School on Number Theory (Prof. Toru Komatsu and Hidetaka Kitayama), Tohoku University of Community Service and Science, Koeki Hall, Sep. 10, 2019 Web (Japanese)
Norm one tori and Hasse norm principle (II),
Niigata Algebra Seminar (Prof. Hideo Kojima and Takeshi Takahashi), Niigata Univ., Oct. 18, 2019 Web (Japanese)
Degree three unramified cohomology groups and Noether's problem for groups of order 243,
Geometry of Projective Varieties and Related Topics 2019 (Prof. Yoshiaki Fukuma, Hideo Kojima and Takeshi Harui), Kochi Univ., Nov. 3, 2019 Web (Japanese)
Norm one tori and Hasse norm principle (III),
Niigata Algebra Seminar (Prof. Hideo Kojima and Takeshi Takahashi), Niigata Univ., Nov. 15, 2019 Web (Japanese)
Rationality problem for fields of invariants,
The 41st Symposium on Commutative Algebra (Prof. Tokuji Araya, Mitsuyasu Hashimoto and Futoshi Hayasaka), Kurashiki Seaside Hotel, Nov. 28, 2019 Web

[ 2018 ]

(with Ming-chang Kang, Aiichi Yamasaki) Degree three unramified cohomology groups and Noether's problem for groups of order 243,
Spring Meeting of the Mathematical Society of Japan, The University of Tokyo, Mar. 18, 2018 Web (Japanese)
(with Ming-chang Kang, Aiichi Yamasaki**) Computation of degree three unramified cohomology groups using GAP,
Spring Meeting of the Mathematical Society of Japan, The University of Tokyo, Mar. 18, 2018 Web (Japanese)
Degree three unramified cohomology groups and Noether's problem for groups of order 243 (II),
Niigata Algebra Seminar (Prof. Hideo Kojima and Takeshi Takahashi), Niigata Univ., May 18, 2018 Web (Japanese)
Rationality problem for fields of invariants and unramified cohomology groups,
International Workshop on Algebra (Prof. Jungkai Alfred Chen and Chia-Fu Yu), NCTS, National Taiwan Univ., Taiwan, Jun. 9, 2018 Web
Degree three unramified cohomology groups and Noether's problem for groups of order 243,
Séminaire "Variétés Rationnelles" (Prof. Jean-Louis Colliot-Thélène, Cyril Demarche and Mathieu Florence), Université Pierre-et-Marie-Curie (Paris VI), France, Jun. 22, 2018 Web

[ 2017 ]

Rationality problem for fields of invariants,
The 15th Affine Algebraic Geometry Meeting (Prof. Hideo Kojima, Takashi Kishimoto, Adrien Dubouloz and Kayo Masuda), Kwansei Gakuin Univ., Mar. 5, 2017 Web
(with Ming-chang Kang, Aiichi Yamasaki**) Relation modules of dihedral groups,
Spring Meeting of the Mathematical Society of Japan, Tokyo Metropolitan Univ., Mar. 24, 2017 Web (Japanese)
(with Ming-chang Kang, Aiichi Yamasaki) Degree three unramifed cohomology groups (II),
Spring Meeting of the Mathematical Society of Japan, Tokyo Metropolitan Univ., Mar. 24, 2017 Web (Japanese)
(with Ming-chang Kang, Aiichi Yamasaki) Multiplicative invariant fields of dimension n ≤ 6,
Spring Meeting of the Mathematical Society of Japan, Tokyo Metropolitan Univ., Mar. 24, 2017 Web (Japanese)
Rationality problem for fields of invariants,
Algebraic Geometry Seminar (Prof. Takehiko Yasuda), Osaka Univ., May 15, 2017 Web (Japanese)
Cubic Thue equations and simplest cubic fields,
Journées Algophantiennes Bordelaises 2017 (Prof. Yuri Bilu), Institut de Mathématiques de Bordeaux, Université Bordeaux, France, Jun. 8, 2017 Web
Rationality problem for fields of invariants*,
Conference: Commutative Banach Algebra and Related Topics (the 91th Yonezawa Sugaku Seminar) (Prof. Takeshi Miura and Takahiro Hayata), Yamagata Univ., Jul. 1, 2017
Rationality problem for fields of invariants,
Algebra Seminar (Prof. Masanobu Kaneko, Shinichi Kobayashi and Shun'ichi Yokoyama), Kyushu Univ., Jul. 7, 2017 Web (Japanese)
Rationality problem for fields of invariants,
Kagurazaka Algebra Seminar (Prof. Masanari Kida), Tokyo University of Science, Jul. 18, 2017 Web (Japanese)
Unramified Brauer group of multiplicative invariant fields of dimension ≤ 6 (I),
NCTS Seminar on Algebra (Prof. Ming-chang Kang), NCTS, National Taiwan Univ., Taiwan, Sep. 20, 2017
Rationality problem for fields of invariants,
Kinosaki algebraic geometry symposium 2017 (Prof. Taro Fujisawa, Takuzo Okada and Taro Sano), Kinosaki International Arts Center, Oct. 25, 2017 Web
Degree three unramified cohomology groups and Noether's problem for groups of order 243,
Niigata Algebra Seminar (Prof. Hideo Kojima and Takeshi Takahashi), Niigata Univ., Dec. 15, 2017 Web (Japanese)

[ 2016 ]

(with Ming-chang Kang, Aiichi Yamasaki**) Degree three unramified cohomology groups,
Spring Meeting of the Mathematical Society of Japan, Tsukuba Univ., Mar. 16, 2016 Web (Japanese)
(with Aiichi Yamasaki**) Bravais group of dimension n ≤ 6 and corresponding quadratic forms,
Spring Meeting of the Mathematical Society of Japan, Tsukuba Univ., Mar. 16, 2016 Web (Japanese)
On Noether's problem for cyclic groups of prime order,
Spring Meeting of the Mathematical Society of Japan, Tsukuba Univ., Mar. 16, 2016 Web (Japanese)
(with Hidetaka Kitayama) Three-dimensional purely quasi-monomial actions,
Spring Meeting of the Mathematical Society of Japan, Tsukuba Univ., Mar. 16, 2016 Web (Japanese)
Rationality problem for fields of invariants*,
Colloquium of Dept. of Math., Tokyo University of Science, May 12, 2016 Web (Japanese)
Birational classification of fields of invariants for groups of order 128,
Workshop on Galois point and related topics (Prof. Kei Miura, Takeshi Takahashi and Satoru Fukasawa), Niigata Univ., Satellite campus, Jun. 3, 2016 Web (Japanese)
On the simplest cubic fields and related Thue equations,
Conference: Commutative Banach Algebra and Related Topics (the 90th Yonezawa Sugaku Seminar) (Prof. Takeshi Miura and Takahiro Hayata), Yamagata Univ., Jul. 3, 2016
Rationality problem for fields of invariants*,
Aichi Number Theory Seminar (Prof. Yasuhiro Kishi and Yasushi Mizusawa), Aichi Institute of Technology, Motoyama Campus, Jul. 16, 2016 Web (Japanese)
Rationality problem for fields of invariants,
Workshop: Rationality and selfmaps of algebraic varieties (Prof. Shigeru Mukai and Keiji Oguiso), RIMS, Kyoto Univ., Jul. 21, 2016 Web
On the simplest cubic fields and related Thue equations,
Matsue Seminar (Prof. Miho Aoki), Shimane Univ., Jul. 26, 2016 Web (Japanese)
Rationality problem for fields of invariants,
Matsue Seminar (Prof. Miho Aoki), Shimane Univ., Jul. 26, 2016 Web (Japanese)
Rationality problem for fields of invariants,
Japan-Taiwan Joint conference on Number theory 2016 (Prof. Ming-Lun Hsieh and Masataka Chida), NCTS, National Taiwan Univ., Taiwan, Sep. 9, 2016 Web
Rationality problem for fields of invariants,
Workshop: Researches on isometries from various viewpoints (Prof. Takeshi Miura), RIMS, Kyoto Univ., Oct. 31, 2016
Rationality problem for fields of invariants,
Workshop: Algebraic Number Theory and Related Topics (Prof. Yasuo Ohno and Hiroshi Tsunogai), RIMS, Kyoto Univ., Nov. 29, 2016 Web
Rationality problem for fields of invariants*,
Niigata Algebra Seminar (Prof. Hideo Kojima and Takeshi Takahashi), Niigata Univ., Dec. 23, 2016 Web (Japanese)

[ 2015 ]

On the simplest cubic fields and related Thue equations
Joint Seminar and Reseach Camp (JSRC2015) CNiigata Univ., Mar. 4, 2015 Web
Birational classification of fields of invariants for groups of order 128,
Spring Meeting of the Mathematical Society of Japan, Meiji Univ., Mar. 23, 2015 Web (Japanese)
Rationality problem for algebraic tori,
Conference: Commutative Banach Algebra and Related Topics (the 88th Yonezawa Sugaku Seminar) (Prof. Takeshi Miura and Takahiro Hayata), Yamagata Univ., Jun. 27, 2015
On the simplest number fields and related Thue equations,
29th Journées Arithmétiques (JA2015), Univ. of Debrecen, Hungary, Jul. 9, 2015 Web
On the simplest number fields and related Thue equations,
The 4th International Congress on Natural Sciences (ICNS2015), National Changhua Univ. of Education, Taiwan, Sep. 10, 2015 Web
On Noether's problem for cyclic groups of prime order,
Wokshop: Towards new development of mathematics via computational algebra system (Prof. Shun'ichi Yokoyama, Manabu Oura, Masanari Kida and Akihiro Munemasa), RIMS, Kyoto Univ., Japan, Sep. 30, 2015 RIMS Proceedings (Japanese)
Birational classification of fields of invariants for groups of order 128,
The 11th workshop on algebraic surfaces at Akihabara* (Prof. Kazuhiro Konno and Hiro-o Tokunaga), Tokyo Metropolitan Univ., Akihabara Satellite Campus, Oct. 24, 2015 Web (Japanese)
On the simplest number fields and related Thue equations,
Analytic Number Theory Seminar (Prof. Koji Matsumoto), Nagoya Univ., Dec. 7, 2015

[ 2014 ]

(with Ming-chang Kang, Aiichi Yamasaki**) Class numbers and algebraic tori,
Spring Meeting of the Mathematical Society of Japan, Gakushuin Univ., Mar. 18, 2014 Web (Japanese)
Rationality problem for fields of invariants C
Conference: Commutative Banach Algebra and Related Topics (the 87th Yonezawa Sugaku Seminar) (Prof. Takeshi Miura and Takahiro Hayata), Yamagata Univ., Jun. 28, 2014
(with Aiichi Yamasaki) Rationality problem for algebraic tori,
SEOUL ICM 2014, Short Communications, Coex, Seoul, Korea, Aug. 19, 2014 Web
Birational classification of fields of invariants for groups of order 128,
New Developments in Algebraic Geometry (Prof. Caucher Birkar, Jungkai Alfred Chen, Wu-Yen Chuang and Jeng-Daw Yu), NCTS/TPE, National Taiwan Univ., Taiwan, Sep. 5, 2014 Web
Rationality problem for fields of invariants,
Geometry of Projective Varieties and Related Topics 2014 (Prof. Yoshiaki Fukuma and Hideo Kojima), Kochi Univ., Nov. 3, 2014 Web (Japanese)

[ 2013 ]

Rationality problem for fields of invariants --from the viewpoint of inverse Galois problem--*,
Colloquium of Dept. of Math., Rikkyo Univ., Jan. 16, 2013
(with Aiichi Yamasaki) Krull-Schmidt theorem fails for dimension 5,
Spring Meeting of the Mathematical Society of Japan, Kyoto Univ., Mar. 23, 2013 Web (Japanese)
Noether's problem and unramified Brauer groups (joint work with M. Kang and B. E. Kunyavskii) C
Algebraic Geometry Seminar (Prof. Shigeyuki Kondo and Shohei Ma), Nagoya Univ., Jun. 3, 2013
Rationality problem for fields of invariants: a survey,
One-day workshop of algebra (Prof. Ming-chang Kang), NCTS/TPE, National Taiwan Univ., Taiwan, Aug. 19, 2013 Web
Noether's problem and unramified Brauer groups*,
Nishi-Waseda Seminar on Number Theory (Prof. Yumiko Hironaka), Waseda Univ., Sep. 11, 2013
Rationality problem for fields of invariants*,
Workshop on Galois point and related topics (Prof. Kei Miura, Takeshi Takahashi and Satoru Fukasawa), Yamagata Univ., Sep. 14, 2013 Web

[ 2012 ]

On the simplest cubic fields and related Thue equations,
Colloquium of Dept. of Math., Rikkyo Univ., Jan. 25, 2012
Quasi-monomial actions and some 4-dimensional rationality problems (joint work with M. Kang and H. Kitayama),
The 9th Affine Algebraic Geometry Meeting (Prof. Takashi Kishimoto, Hideo Kojima and Shigeru Kuroda), Kwansei Gakuin Univ., Mar. 3, 2012 Web
Unramified Brauer groups for groups of order p⁵ (joint work with M. Kang and B. E. Kunyavskii),
Mini-Conference on Algebraic Geometry (Prof. Fumio Sakai), Saitama Univ., Mar. 7, 2012 Web
(with Ming-chang Kang) Unramified Brauer groups for groups of order p⁵,
Spring Meeting of the Mathematical Society of Japan, Tokyo Univ. of Science, Mar. 26, 2012 Web (Japanese)
(with Ming-chang Kang and Hidetaka Kitayama) Quasi-monomial actions and some 4-dimensional rationality problems,
Spring Meeting of the Mathematical Society of Japan, Tokyo Univ. of Science, Mar. 26, 2012 Web (Japanese)
Noether's problem and unramified Brauer groups (joint work with M. Kang and B. E. Kunyavskii),
Singularity Theory Monday Seminar (Prof. Kei-Ichi Watanabe), Nihon Univ., May 21, 2012
Noether's problem and unramified Brauer groups (joint work with M. Kang and B. E. Kunyavskii) C
Conference: Commutative Banach Algebra and Related Topics (Prof. Sin-Ei Takahasi and Takeshi Miura), (the 86th Yonezawa Sugaku Seminar), Yamagata Univ., Jun. 27, 2012
Noether's problem and unramified Brauer groups (joint work with M. Kang and B. E. Kunyavskii) C
The 11th conference of Sendai-Hiroshima number theory (Prof. Toshiro Hiranouchi, Makoto Matsumoto, Hiroki Sumida-Takahashi, Nobuo Tsuzuki and Akihiko Yukie), Tohoku Univ., July 18, 2012 Web (Japanese)
On the simplest cubic fields and related Thue equations,
The 2nd conference on MAGMA (Prof. Manabu Oura, Masanari Kida, Masaaki Harada, Akihiro Munemasa and Shun'ichi Yokoyama), Kochi Univ., July 21, 2012 Web (Japanese)
Noether's problem and unramified Brauer groups (joint work with M. Kang and B. E. Kunyavskii) C
The 7th Fukuoka Number Theory Conference (Prof. Masanobu Kaneko, Yasuro Gon and Yasuhiro Kishi), Kyushu Univ., Aug. 10, 2012 Web (Japanese)
Rationality problem of algebraic tori (I) (joint work with A. Yamasaki),
One-day workshop of algebra (Prof. Ming-chang Kang), NCTS/TPE, National Taiwan Univ., Taiwan, Aug. 16, 2012 Web
Noether's problem and unramified Brauer groups (joint work with M. Kang and B. E. Kunyavskii) C
Workshop on Galois point and related topics (Prof. Kei Miura, Takeshi Takahashi and Satoru Fukasawa), Yamagata Univ., Sep. 15, 2012 Web
(with Ming-chang Kang and Boris E. Kunyavskii) Noether's problem and unramified Brauer groups C
Autumn Meeting of the Mathematical Society of Japan, Kyushu Univ., Sep. 19, 2012 Web (Japanese)
(with Aiichi Yasamaki) Rationality problem for algebraic tori,
Autumn Meeting of the Mathematical Society of Japan, Kyushu Univ., Sep. 19, 2012 Web (Japanese)
Rationality problem for fields of invariants --from the viewpoint of inverse Galois problem--*,
Joint seminar: The 108th 7th-Floor Seminar (Colloquium), Nishi-Waseda Seminar on Number Theory, Waseda Univ., Nov. 30, 2012 Web (Japanese)
Rationality problem of quasi-monomial actions,
Workshop: Algebraic Number Theory and Related Topics (Prof. Atsushi Shiho and Tadashi Ochiai), RIMS, Kyoto Univ., Dec. 5, 2012 Web

[ 2011 ]

On the simplest sextic fields and related Thue equations,
One-day workshop of algebra (Prof. Ming-chang Kang), NCTS/TPE, National Taiwan Univ., Taiwan, Aug. 16, 2011 Web

[ 2010 ]

Rationality problem of three-dimensional monomial group actions (joint work with H. Kitayama and A. Yamasaki),
The 5th Affine Algebraic Geometry Meeting (Prof. Kayo Masuda, Hideo Kojima and Takashi Kishimoto), Kwansei Gakuin Univ., Mar. 5, 2010 Web
Rationality problem of twisted symmetric group actions,
Spring Meeting of the Mathematical Society of Japan, Keio Univ., Mar. 27, 2010 Web (Japanese)
On the simplest cubic fields and related Thue equations,
Autumn Meeting of the Mathematical Society of Japan, Nagoya Univ., Sep. 25, 2010 Web (Japanese)
On the simplest sextic fields and related Thue equations,
Autumn Meeting of the Mathematical Society of Japan, Nagoya Univ., Sep. 25, 2010 Web (Japanese)
Three-dimensional monomial group actions (joint work with H. Kitayama and A. Yamasaki),
TIMS Lecture (Prof. Ming-chang Kang), Taida Institute for Mathematical Sciences (TIMS), National Taiwan Univ., Taiwan, Oct. 22, 2010 Web
Three-dimensional monomial group actions (joint work with H. Kitayama and A. Yamasaki),
Seminar of Algebra (Prof. Ming-chang Kang), Taida Institute for Mathematical Sciences (TIMS), National Taiwan Univ., Taiwan, Oct. 29, 2010

[ 2009 ]

On correspondence between solutions of a parametric family of cubic Thue equations and isomorphism classes of simplest cubic fields,
Conference: Diophantine Analysis and Related Fields 2009 (DARF2009) (Prof. Noriko Hirata-Kohno, Masaaki Amou, Ryotaro Okazaki, Takao Komatsu and Isao Wakabayashi), Nihon Univ., March 2, 2009 Web
(with Katsuya Miyake) On the field isomorphism problem of X^3+sX+s and related cubic Thue equations,
Autumn Meeting of the Mathematical Society of Japan, Osaka Univ., Sep. 25, 2009 Web (Japanese)
(with Hidetaka Kitayama** and Aiichi Yamasaki) Three-dimensional monomial group actions,
Autumn Meeting of the Mathematical Society of Japan, Osaka Univ., Sep. 25, 2009 Web (Japanese)
On the simplest quartic fields and related Thue equations,
The Joint Conference of ASCM2009 and MACIS2009, ASCM2009 Special Session on Computational Algebraic Number Theory (Prof. Guenael Renault and Kazuhiro Yokoyama), JAL Resort Sea Hawk Hotel Fukuoka, Dec. 16, 2009 Web
Simple families of cyclic polynomials and related problems,
Joint Conference: Hokuriku Number Theory Conference and Galois theory and related topics (Prof. Ki-ichiro Hashimoto and Akito Nomura), Kanazawa Univ., Dec. 26, 2009
(with Hidetaka Kitayama** and Aiichi Yamasaki**) Rationality problem for three-dimensional monomial group actions,
Joint Conference: Hokuriku Number Theory Conference and Galois theory and related topics (Prof. Ki-ichiro Hashimoto and Akito Nomura), Kanazawa Univ., Dec. 27, 2009

[ 2008 ]

On the field intersection problem of generic polynomials via resolvent polynomials,
Foundations of Computational Mathematics (FoCM'08) WORKSHOP C4 Computational number theory (Prof. Hendrik Lenstra, Takakazu Satoh and Peter Stevenhagen), City Univ. of Hong Kong, China, Jun. 24, 2008 Web
Note on the field intersection problem of generic polynomials*,
Conference: Commutative Banach Algebra and Related Topics (Prof. Sin-Ei Takahasi and Takeshi Miura), (the 77th Yonezawa Sugaku Seminar), Yamagata Univ., July 2, 2008
(with Katsuya Miyake) Some Diophantine problems arising from the isomorphism problem of generic polynomials,
The 5th Japan-China Seminar on Number Theory (Prof. Shigeru Kanemitsu), Kinki Univ., Aug. 27, 2008
(with Katsuya Miyake) On the field isomorphism problem of generic polynomials via formal Tschirnhausen transformation,
Conference: Galois theory and related topics Tokushima 2008 (Prof. Ki-ichiro Hashimoto, Shin-ichi Katayama, Hiroaki Nakamura, Hiroki Sumida-Takahashi and Masanari Kida), Tokushima Univ., Sep. 9, 2008 Web (Japanese)
(with Katsuya Miyake) Note on the field isomorphism problem of generic polynomials*,
Autumn Meeting of the Mathematical Society of Japan, Tokyo Institute of Technology, Sep. 27, 2008 Web (Japanese)
(with Katsuya Miyake) On the field isomorphism problem of generic polynomials via formal Tschirnhausen transformation,
The Japan-Korea Joint Seminar on Number Theory and Related Topics 2008 (Prof. Hisao Taya), Tohoku Univ., Nov. 12, 2008 Web

[ 2007 ]

Tschirnhausen transformation of a cubic generic polynomial and a 2-dimensional involutive Cremona transformation, as a part of NCTS Short Course on Number Theory (Prof. K. Miyake)
National Center for Theoretical Sciences (Prof. Wen-Ching Winnie Li and Jing Yu), Math. Division in National Tsing Hua Univ., Taiwan, Jun. 27, 2007
Constructive Study in Inverse Galois Problem (Survey Talk) -Generic polynomial and Noether's problem-*,
Workshop on Galois point and related topics (Prof. Masaaki Homma and Hisao Yoshihara), Kanagawa Univ. Fujimi-kogen kenshujyo, July 1, 2007 Web
On Tschirnhausen transformations and the field isomorphism problem of cubic generic polynomials*,
Conference: Commutative Banach Algebra and Related Topics (Prof. Sin-Ei Takahasi and Takeshi Miura), (the 74th Yonezawa Sugaku Seminar), Yamagata Univ., July 11, 2007
Cubic generic polynomials and some Cremona transformations (joint work with Prof. K. Miyake),
Seminar of Algebra (Prof. Ming-chang Kang), National Center for Theoretical Sciences, Math. Division (Taipei Office) in National Taiwan Univ., Taiwan, July 26, 2007 Web
A geometric framework for the subfield problem of generic polynomials via Tschirnhausen transformation (joint work with K. Miyake)
Number Theory Seminar at Waseda Univ. (Prof. Ki-ichiro Hashimoto and Keiichi Komatsu), Waseda Univ., Oct. 5, 2007 Web (Japanese)
(with Katsuya Miyake) A geometric framework for the subfield problem of generic polynomials via Tschirnhausen transformation,
Conference: Galois theory and related topics (Prof. Ki-ichiro Hashimoto, Naoki Murabayashi and Masanari Kida), Yamagata Univ., Nov. 4, 2007 Web (Japanese)
Note on the field isomorphism problem of generic polynomials (joint work with K. Miyake),
The 7th Symposium on Algebra and Computation (AC2007) (Prof. Ken Nakamula, Michio Ozeki, Nobuki Takayama, Katsushi Waki, Hirofumi Tsumura and Shigenori Uchiyama), Tokyo Metropolitan Univ., Dec. 6, 2007 Web
A geometric framework for the subfield problem of generic polynomials via Tschirnhausen transformation (joint work with K. Miyake),
Conference: Algebraic Number Theory and Related Topics (Prof. Mamoru Asada and Hiroaki Nakamura), Research Institute for Mathematical Science (RIMS), Kyoto Univ., Dec. 14, 2007 Web

[ 2006 ]

Generic Polynomials in Inverse Galois Problem (Survey Talk)*,
The 69th 7th-Floor Seminar (Colloquium), Waseda Univ., Jun. 19, 2006 Web (Japanese)
Noether's problem and generic polynomial -from the view point of Inverse Galois Problem-*,
Conference: Commutative Banach Algebra and Related Topics (Prof. Sin-Ei Takahasi and Takeshi Miura), (the 69th Yonezawa Sugaku Seminar), Yamagata Univ., July 5, 2006
An involution of the Cremona group derived from Tschirnhausen transformations of generic cubic polynomials and the rationality of its fixed field*,
The 1st Fukuoka Number Theory Conference (Prof. Toru Komatsu), Kyushu Univ., Aug. 24, 2006 Web (Japanese)
(with Katsuya Miyake) An involution of the Cremona group derived from Tschirnhausen transformations of generic cubic polynomials and the rationality of its fixed field*,
Autumn Meeting of the Mathematical Society of Japan, Osaka City Univ. Sep. 22, 2006 Web (Japanese)
(with Katsuya Miyake) Tschirnhausen Transformation of a Cubic Generic Polynomial and a 2-dimensional Involutive Cremona Transformation,
International Conference on Number Theory (Prof. Balakrishnan Ramakrishnan and Kalyan Chakraborty), Harish-Chandra Research Institute, India, Dec. 1, 2006 Web

[ 2005 ]

Explicit construction of some multiplicative quadratic forms on algebraic varieties,
Oberseminar über Reelle Algebra (Prof. Manfred Knebusch), Universität Regensburg, Germany, Apr. 26, 2005
Noether's problem and Q-generic polynomials,
Kolloquium in Universität des Saarlandes (Prof. Rainer Schulze-Pillot), Universität des Saarlandes, Germany, May 27, 2005 Web
Noether Problems and Q-Generic Polynomials for the Normalizer of the 8-Cycle in S₈,
Oberseminar Algebra-Zahlentheorie (Prof. B. Heinrich Matzat), Ruprecht-Karls-Universität Heidelberg, Germany , May 30, 2005
Noether's problem and Q-generic polynomials for the normalizer of the 8-cycle in S₈ and its subgroups,
Vortrag in der Arbeitsgemeinschaft über Algebra (Prof. Gregor Kemper), Technische Universität München, Germany, July 5, 2005
Noether's problem for Frobenius groups of prime degree up to 23,
Conference: Galois groups and algebraic equations (Prof. Ki-ichiro Hashimoto, Masanari Kida and Nobuhiro Terai), Kagoshima Univ., Sep. 5, 2005 Web

[ 2004 ]

On the structure of the C₈-fixed field of Q(x₁,...,x₈),
Workshop: Inverse Galois Problem and Galois Coverings III (Prof. Hirotada Naito, Hiroki Sumida-Takahashi and Hiro-o Tokunaga), Kagawa Univ., Jan. 5, 2004
Noether's Problem for meta-abelian groups,
Workshop on Number Theory at Waseda Univ. (Prof. Ki-ichiro Hashimoto and Keiichi Komatsu), Waseda Univ., Mar. 17, 2004 Web (Japanese)
Noether's Problem for Frobenius groups of degree 7 and its generic dimension*,
Spring Meeting of the Mathematical Society of Japan, Tsukuba Univ., Mar. 30, 2004 Web (Japanese)
Noether's Problem for meta-abelian groups,
Number Theory Seminar at Tokyo Metropolitan Univ. (Prof. Toru Komatsu and Yuichi Rikuna), Tokyo Metropolitan Univ., Apr. 27, 2004
Multiplicative quadratic forms on algebraic varieties,
Oberseminar über Reelle Algebra (Prof. Manfred Knebusch), Universität Regensburg, Germany, Nov. 2, 2004
Multiplicative quadratic forms on algebraic varieties II,
Oberseminar über Reelle Algebra (Prof. Manfred Knebusch), Universität Regensburg, Germany, Nov. 9, 2004
A remark on rational bioctic reciprocity law,
Oberseminar über Reelle Algebra (Prof. Manfred Knebusch), Universität Regensburg, Germany, Nov. 30, 2004

[ 2003 ]

(with Ki-ichiro Hashimoto) Construction of families of cyclic polynomials with Gaussian period polynomials II*,
Spring Meeting of the Mathematical Society of Japan, Tokyo Univ., Mar. 25, 2003
Quintic Jacobi sums and period polynomials for finite fields,
Spring Meeting of the Mathematical Society of Japan, Tokyo Univ., Mar. 25, 2003
Noether's Problem for D₅, F₂₀ and D₆,
Number Theory Seminar at Tokyo Metropolitan Univ. (Prof. Yasuhiro Kishi and Toru Komatsu), Tokyo Metropolitan Univ., May 20, 2003
Noether's Problem for D₅, F₂₀ and D₆,
Number Theory Seminar at Waseda Univ. (Prof. Ki-ichiro Hashimoto and Keiichi Komatsu), Waseda Univ., Jun. 6, 2003 Web (Japanese)
(with Ki-ichiro Hashimoto) Geometric generalization of Gaussian period relations with application to Noether's problem for meta-cyclic groups,
Autumn Meeting of the Mathematical Society of Japan, Chiba Univ. Sep. 25, 2003 Web (Japanese)

[ 2002 ]

(with Ki-ichiro Hashimoto) Construction of families of cyclic polynomials with Gaussian period polynomials*,
Workshop on Number Theory at Waseda Univ. (Prof. Ki-ichiro Hashimoto and Keiichi Komatsu), Waseda Univ., Mar. 18, 2002 Web (Japanese)
(with Ki-ichiro Hashimoto) Construction of families of cyclic polynomials with Gaussian period polynomials*,
Spring Meeting of the Mathematical Society of Japan, Meiji Univ., Mar. 28, 2002
Irreducible polynomials of Gaussian periods and constructions of cyclic polynomials*,
Number Theory Seminar at Waseda Univ. (Prof. Ki-ichiro Hashimoto and Keiichi Komatsu), Waseda Univ., May 17, 2002 Web (Japanese)
Families of cyclic polynomials obtained from geometric generalization of Gaussian period relations*,
Workshop: Inverse Galois Problem and Galois Coverings (Prof. Hiro-o Tokunaga), Tokyo Metropolitan Univ., Aug. 24, 2002
Multiplicative quadratic forms on algebraic varieties,
Autumn Meeting of the Mathematical Society of Japan, Shimane Univ., Sep. 27, 2002
Multiplicative quadratic forms on algebraic varieties,
Number Theory Seminar at Waseda Univ. (Prof. Ki-ichiro Hashimoto and Keiichi Komatsu), Waseda Univ., Oct. 4, 2002 Web (Japanese)
Multiplicative quadratic forms on algebraic varieties,
Number Theory Seminar at Tokyo Metropolitan Univ. (Prof. Kazuo Matsuno), Tokyo Metropolitan Univ., Oct. 29, 2002
Construction of simple cyclic polynomials of small degree,
Workshop: Inverse Galois Problem and Galois Coverings II (Prof. Hirotada Naito and Hiro-o Tokunaga), Kagawa Univ., Dec. 26, 2002

Slides

Talks