ねじれアレキサンダー多項式を用いた結び目(群)の分類について
キーワード:2次元リボン2結び目、ねじれアレキサンダー多項式
2018.02.
角 俊雄(すみ としお) | データ更新日:2024.05.07 |
主な研究テーマ
Borsuk-Ulam 群について
キーワード:表現空間
2017.10.
キーワード:表現空間
2017.10.
高次元テンソルの複数典型ランクと正則多重線形写像の存在の関係について
キーワード:典型ランク
2014.01.
キーワード:典型ランク
2014.01.
高次元テンソルの階数について
キーワード:テンソル、階数、典型階数
2008.07.
キーワード:テンソル、階数、典型階数
2008.07.
2固定点作用をもつ球面上の有限群作用と群の表現の関係について
キーワード:群作用、球面、接表現
2006.08.
キーワード:群作用、球面、接表現
2006.08.
研究業績
主要著書
主要原著論文
1. | Taizo Kanenobu, Toshio Sumi, Extension of Takahashi’s ribbon 2knots with isomorphic groups, Journal of Knot Theory and Its Ramifications, 10.1142/S021821652350013X, 32, 2, 2350013 (12 pages), 2023.03, We give infinitely many pairs of ribbon 2-knots of 1-fusion in S4 with isomorphic knot groups, which extend Takahashi’s examples. They are distinguished by the trace sets, which are calculated by using SL(2, C)-representations of the knot groups.. |
2. | Taizo Kanenobu, Toshio Sumi, Twisted Alexander polynomial of a ribbon 2-knot of 1-fusion, Osaka Journal of Mathematics, 57, 4, 789-803, 2020.10, [URL]. |
3. | Taizo Kanenobu, Toshio Sumi, Suciu's ribbon 2-knots with isomorphic group, Journal of Knot Theory and Its Ramifications, https://doi.org/10.1142/S0218216520500534, 29, 7, 2050053 (9 pages), 2020.09. |
4. | Taizo Kanenobu, Toshio Sumi, Classification of ribbon 2-knots presented by virtual arcs with up to four crossings, Journal of Knot Theory and Its Ramifications, http://dx.doi.org/10.1142/S0218216519500676, 28, 10, 1950067 (18 pages), 2019.10. |
5. | Toshio Sumi, Mitsuhiro Miyazaki, Toshio Sakata, Typical ranks of semi-tall real 3-tensors, Linear and Multilinear Algebra, 10.1080/03081087.2019.1637811, 2019.07. |
6. | Taizo Kanenobu, Toshio Sumi, Classification of a family of ribbon 2-knots with trivial Alexander polynomial, Communications of the Korean Mathematical Society, http://doi.org/10.4134/CKMS.c170222, 33, 2, 591-604, 2018.04. |
7. | Mitsuhiro Miyazaki, Toshio Sumi, Toshio Sakata, Typical ranks of certain 3-tensors and absolutely full column rank tensors, Linear and Multilinear Algebra, http://www.tandfonline.com/doi/abs/10.1080/03081087.2017.1292994, 66, 1, 193-205, 2017.03, In this paper, we study typical ranks of 3-tensors and show that there are plural typical ranks for m x n x p tensors over the real number field in the following cases: (1) 3≦m≦h(n) and (m-1)(n-1)+1≦p≦(m-1)n, where h is the Hurwitz-Radon function, (2) m=3, n=3 (mod 4) and p=2n-1, (3) m=4, n=2 (mod 4), n≧6 and p=3n-2, (4) m=6, n=4 (mod 8), n≧12 and p=5n-4, (5) m=10, n=24 (mod 32) and p=9n-8.. |
8. | Toshio Sumi, Mitsuhiro Miyazaki, Toshio Sakata, Typical ranks for 3-tensors, nonsingular bilinear maps and determinantal ideals, Journal of Algebra, http://dx.doi.org/10.1016/j.jalgebra.2016.09.028, 471, 1, 409-453, 2017.02, Let m,n≥3, (m−1)(n−1)+2≤p≤mn, and u=mn−p. The set Ru×n×m of all real tensors with size u×n×m is one to one corresponding to the set of bilinear maps Rm×Rn→Ru. We show that Rm×n×p has plural typical ranks p and p+1 if and only if there exists a nonsingular bilinear map Rm×Rn→Ru. We show that there is a dense open subset O of Ru×n×m such that for any Y∈O, the ideal of maximal minors of a matrix defined by Y in a certain way is a prime ideal and the real radical of that is the irrelevant maximal ideal if that is not a real prime ideal. Further, we show that there is a dense open subset T of Rn×p×m and continuous surjective open maps ν:O→Ru×p and σ:T→Ru×p, where Ru×p is the set of u×p matrices with entries in R, such that if ν(Y)=σ(T), then rank T=p if and only if the ideal of maximal minors of the matrix defined by Y is a real prime ideal.. |
9. | Toshio Sumi, Richness of Smith equivalent modules for finite gap Oliver groups, Tohoku Journal of Mathematics, doi:10.2748/tmj/1474652268, 68, 3, 457-469, 2016.09. |
10. | Toshio Sumi, Mitsuhiro Miyazaki, Toshio Sakata, Typical rank of mxnx(m-1)n tensors with 3Linear and Multilinear Algebra, http://dx.doi.org/10.1080/03081087.2014.910206, 63, 5, 940-955, 2015.07, Let 3\rho(n), then the set of m x n x (m-1)n tensors has only one typical rank (m-1)n.. |
11. | Toshio Sumi, Centralizers of gap groups, Fundamenta Mathematicae, 10.4064/fm226-2-1, 226, 101-121, 2014.06, A finite group G is called a gap group if there exists an RG-module which has no large isotropy groups except at zero and satisfies the gap condition. The gap condition facilitates the process of equivariant surgery. Many groups are gap groups and also many groups are not. In this paper, we clarify the relation between a gap group and the structures of its centralizers. We show that a nonsolvable group which has a normal, odd prime power index proper subgroup is a gap group.. |
12. | 角 俊雄, Smith sets of non-solvable groups whose nilquotients are cyclic groups of order 1,2, or 3, RIMS Kokyuroku Bessatsu, B39, 149-165, 2013.06, Let $G$ be a finite group. Two real $G$-modules $U$ and $V$ are called Smith equivalent if there exists a smooth action of $G$ on a sphere with two fixed points at which tangential representations are isomorphic to $U$ and $V$ respectively. The Smith set of $G$ is the subset of the real representation ring of $G$ consisting differences of Smith equivalent $G$-modules. We discuss when the Smith set of an Oliver group becomes an abelian group and give several examples of non-solvable groups of which the Smith sets are groups. . |
13. | Krzysztof Pawalowski, Toshio Sumi, The Laitinen Conjecture for finite non-solvable groups, Proceedings of the Edinburgh Mathematical Society , http://dx.doi.org/10.1017/S0013091512000223, 56, 1, 303-336, 2013.02, For any finite group G, we impose an algebraic condition, the G^{nil}-coset condition, and prove that any finite Oliver group G satisfying the G^{nil}-coset condition has a smooth action on some sphere with isolated fixed points at which the tangent G-modules are not isomorphic to each other. Moreover, we prove that, for any finite non-solvable group G not isomorphic to Aut(A_{6}) or PΣL(2, 27), the G\sup{nil}-coset condition holds if and only if r_{G} ≥ 2, where r_{G} is the number of real conjugacy classes of elements of G not of prime power order. As a conclusion, the Laitinen Conjecture holds for any finite non-solvable group not isomorphic to Aut(A_{6}).. |
14. | Toshio Sumi, Mitsuhiro Miyazaki, Toshio Sakata, Typical ranks for m x n x (m-1)n tensors with mLinear Algebra and its Applications, 10.1016/j.laa.2011.08.009, 438, 2, 953-958, 2013.01, In various application fields, tensor type data are used recently and then a typical rank is important. There may be more than one typical ranks over the real number field. It is well known that the set of 2 × n × n tensors has two typical ranks n, n + 1 for n>=2, that the set of 3 × 4 × 8 tensors has two typical ranks 8, 9, and that the set of 4×4×12 tensors has two typical ranks 12, 13. In this paper, we show that the set of m×n×(m−1)n tensors with mtypical ranks (m − 1)n, (m − 1)n + 1 if mHurwitz–Radon function.. |
15. | Toshio Sumi, The gap hypothesis for finite groups which have an abelian quotient group not of order a power of 2, Journal of the Mathematical Society of Japan, 10.2969/jmsj/06410091, 64, 1, 91-106, 2012.01. |
16. | Toshio Sumi and Toshio Sakata, Connectivity for 3x3xK contingency tables, Journal of Algebraic Statistics, 2, 1, 54-74, 2011.08. |
17. | Toshio Sumi and Toshio Sakata, 2-neighborhood theorem for 3x3x3 contingency tables, Journal of the Indian Society for Probability and Statistics, 12, 66-84, 2010.12. |
18. | Toshio Sumi and Toshio Sakata, The Set of 3x4x4 Contingency Tables has 3-Neighborhood Property, Proceedings of COMPSTAT'2010, Electronic Supplementary Material (e-book) 19th International Conference on Computational Statistics, Paris France, August 22-27, 2010, 1629-1636, 2010.09. |
19. | Toshio Sumi, Mitsuhiro Miyazaki, and Toshio Sakata, About the maximal rank of 3-tensors over the real and the complex number field, Ann. Inst. Stat. Math., 10.1007/s10463-010-0294-5, 62, 807-822, 2010.09. |
20. | Toshio Sumi, Mitsuhiro Miyazaki, and Toshio Sakata, Rank of 3-tensors with 2 slices and Kronecker canonical forms, Linear Algebra and its Applications, vol. 431, 1858-1868, 2009.10. |
21. | Krzysztof Pawalowski and Toshio Sumi, The Laitinen Conjecture for finite solvable Oliver groups, Proceedings of American Mathematical Society, Proceedings of the American Mathematical Society 137 (6), 2147-2156, 2009, 2009.06. |
主要総説, 論評, 解説, 書評, 報告書等
1. | Toshio Sumi, Alternating groups and Borsuk-Ulam groups, RIMS講究録 2135, 2019.11. |
2. | 角 俊雄, Finite groups with Smith equivalent, nonisomorphic representations, 変換群論シンポジューム2006報告集, 2006.11. |
主要学会発表等
作品・ソフトウェア・データベース等
1. | 角 俊雄, KNOT, 2000.02 児玉氏が Linux 用に開発した、結び目・絡み目の不変量を計算するプログラムを、Windows, Mac 上に 2000年に移植した。2012年には、メンテナンスとして、OSのバージョンアップやCPU の64bit化に対応した。 . |
学会活動
学会大会・会議・シンポジウム等における役割
2019.08.08~2019.08.08, トポロジーシンポジウム, 座長.
2019.05.29~2019.05.29, RIMS共同研究(公開型)「変換群論とその応用」, 座長(Chairmanship).
2018.12.09~2018.12.09, Workshop on Geometric Discrete Mathematics II, 世話人.
2017.05.23~2017.05.23, RIMS共同研究(公開型)「変換群を核とする代数的位相幾何学」, 座長(Chairmanship).
2013.05.28~2013.05.28, RIMS研究集会「変換群のトポロジーとその周辺」, 座長(Chairmanship).
2013.09.18~2013.09.21, 日本数学会, 司会(Moderator).
2012.05.28~2012.06.01, 変換群の幾何の展開, 司会(Moderator).
2011.11.18~2011.11.20, 変換群論シンポジューム, 座長(Chairmanship).
2010.11.23~2010.11.25, 変換群論シンポジューム, 座長(Chairmanship).
2009.12.10~2009.12.12, 変換群論シンポジューム, 座長(Chairmanship).
2008.11.11~2008.11.13, 変換群論シンポジューム, 座長(Chairmanship).
2006.05~2006.05, 変換群論の手法, 司会(Moderator).
2013.03.12~2013.03.13, シンポジューム Structures and Symmetries on Manifolds, 世話人.
2012.05.28~2012.06.01, RIMS研究集会「変換群の幾何の展開」, 世話人、座長.
2010.11.23~2010.11.25, 変換群論シンポジューム, 世話人、座長.
2009.12.10~2009.12.12, 変換群論シンポジューム, 世話人、座長.
学術論文等の審査
年度 | 外国語雑誌査読論文数 | 日本語雑誌査読論文数 | 国際会議録査読論文数 | 国内会議録査読論文数 | 合計 |
---|---|---|---|---|---|
2023年度 | 1 | 1 | |||
2021年度 | 1 | 1 | |||
2020年度 | 2 | 2 | |||
2019年度 | 3 | 0 | 0 | 0 | 3 |
2018年度 | 2 | 0 | 0 | 0 | 2 |
2016年度 | 1 | 1 | |||
2015年度 | 3 | 3 | |||
2014年度 | 2 | 2 | |||
2013年度 | 3 | 3 | |||
2012年度 | 1 | 1 | |||
2011年度 | 4 | 0 | 0 | 0 | 4 |
2008年度 | 2 | 2 | |||
2007年度 | 1 | 0 | 0 | 0 | 1 |
その他の研究活動
海外渡航状況, 海外での教育研究歴
Adam Mickiewicz University, Poland, 2014.09~2014.09.
Collegium Polonicum of the Adam Mickiewicz University, Poland, 2013.09~2013.09.
Gdansk University of Technology, Adam Mickiewicz University, Poland, Poland, 2012.09~2012.09.
University of Milano-Bicocca, Italy, 2010.09~2010.09.
Conservatoire National des Arts et des Métiers, France, 2010.08~2010.08.
Andhra University, India, 2009.12~2010.01.
Comenius University, SlovakRepublic, 2009.09~2009.09.
Universidade do Porto, Portugal, 2008.08~2008.09.
the Congress Center of Holiday inn Hotel, ブルノ工科大学, CzechRepublic, 2008.06~2008.07.
Queen Mary, Mile End Campus, UnitedKingdom, 2007.09~2007.09.
Warszawa University, Poland, 2007.07~2007.08.
Press Center, Seoul, Korea, 2007.06~2007.06.
Malaga University, Spain, 2006.09~2006.09.
Jagiellonian University, Congress Centre, Poland, 2005.06~2005.07.
Jagiellonian University, Adam Mickiewicz University, Poland, Poland, 2004.06~2004.06.
Helsinki University, Adam Mickiewicz University, Finland, Poland, 2003.08~2003.08.
研究資金
科学研究費補助金の採択状況(文部科学省、日本学術振興会)
2023年度~2025年度, 基盤研究(C), 代表, 多様体上の有限群作用で得られる固定点集合の近傍の様相.
2016年度~2018年度, 基盤研究(C), 代表, 多重線形写像の実射影空間への像とテンソル階数への応用.
2012年度~2015年度, 基盤研究(C), 代表, 多様体上の有限群作用の軟性について.
2002年度~2004年度, 基盤研究(C), 代表, 有限群の表現と不動点集合を実現する有限群作用に関する研究.
2005年度~2007年度, 基盤研究(C), 代表, 多様体における有限群作用の固定点上の接空間となる表現に関する研究.
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