Publications
Publications of So Yamagata.
Paper
*Refereed Papers
[4] A classification of combinatorial types of discriminantal arrangements, Journal of Algebraic Combinatorics, 57 (4) (2023) 1007-1032.
[3] On the non-very generic intersections in discriminantal arrangements, Comptes Rendus Mathematique, Vol. 360 (G9) (2022) 1027-1038 (with S. Settepanella).
[2] Pappus’s Theorem in Grassmannian Gr(3, Cn), ARS MATHEMATICA CONTEMPORANEA, Vol 16, No 1 (2019) 257-276, (with S. Sawada, S. Settepanella).
[1] Discriminantal arrangement, 3×3 minors of Plücker matrix and hypersurfaces in Grassmannian Gr(3,n), Comptes Rendus Mathematique, Ser. I 355 (2017) 1111-1120 (with S. Sawada, S. Settepanella).
*Preprint
[5] Mapping fiber, loop and suspension graphs in naive discrete homotopy theory, arXiv: 2402.15714.
[4] A categorification for the characteristic polynomial of matroids (with T. Saito), arXiv:2402.09851.
[3] A braid monodromy presentation for the pure braid group, arXiv:2305.18697.
[2] A splitting property of the chromatic homology of the complete graph, arXiv:2301.01972.
[1] A linear condition for non-very generic discriminantal arrangements (with S. Settepanella), arXiv:2205.04664.
*Proceedings
[2] The generalization of the Braid arrangement and its combinatorics, Proceedings of the 24th Algebra Symposium for Young Researchers, (2019) pp. 38-46.
[1] Discriminantal arrangement, Plücker matrix and hypersurfaces in Grassmannian, Hokkaido University Technical Report Series in Mathematics, No. 173 (2018), 497 - 506.
Talking
[23] Presentation of the pure braid group and section of the braid arrangement, MSJ Spring Meeting 2024，Osaka Metropolitan University 2024/03/17（https://www.mathsoc.jp/activity/meeting/omu24mar/）
[22] On discrete relative homotopy groups, 9th Mexican Workshop on Applied Geometry and Topology, 2023/11/10（https://9mwgeometrytopology.eventos.cimat.mx/home_9atd）
[21] A braid monodromy presentation for the pure braid group，Polynomial Mathematics Seminar，Kyushu University．2023/11/2 （https://sites.google.com/view/mathpolynomial）
[20] A splitting property of the chromatic homology, Homotopy Okinawa 2023，Okinawa．2023/07/01（https://sites.google.com/view/homotopy-okinawa-2023/%E3%83%9B%E3%83%BC%E3%83%A0）
[19] Classification of r-sets and sufficient condition for arrangements to be non-very generic, MSJ Spring Meeting 2023，Chuo University，2023/03/15（http://www.mathsoc.jp/activity/meeting/chuo23mar/）
[18] A characteristic homology for graphic arrangements, Characteristic Polynomials of Hyperplane Arrangements and Ehrhart Polynomials of Convex Polytopes, RIMS, 2023/02/14（https://sv2-mat.ist.osaka-u.ac.jp/~higashitani/workshop202302）
[17] A classificaion of combinatorial types of discriminantal arrangements, Combinatorics, geometry and commutative algebra of hyperplane arrangements, Kyushu University，2023/01/16（https://paulmuecksch.github.io/Conference/index.html）
[16] On non very genericity of arrangements, MSJ Spring Meeting 2022, Saitama University, 2022/03/29（https://www.mathsoc.jp/en/meeting/saitama22mar/index.html）
[15] Combinatorial structure of discriminantal arrangements, The 26th Algebra Symposium for Young Researchers, 2022/03/13, online（https://sites.google.com/view/daisuuwakate2021）
[14] Combinatorics of discriminantal arrangement,apanese Conference on Combinatorics and its Applications 2021, 2021/8/19, Keio University（online）（https://sites.google.com/view/jcca-dmia-2021/）
[13] Combinatorics of discriminantal arrangement, Recent developments in Arrangements, 2021/2/16, Zoom（Hokkaido Univ. & Kyushu Univ.） (https://sites.google.com/view/recentdevelopments202102/)
[12] Combinatorics of the Discriminantal arrangement , Homotopy Theory Symposium 2019, 2019/10/29, Hokkaido (https://sites.google.com/view/homotopy-theory-symposium-2019/home?authuser=0)
[11] Categorification of a chromatic polynomial, COmbinatorics Summer school 2019 (COS 2019), 2019/09, Yamaguchi-ken (https://sites.google.com/view/cos2019 )
[10] Combinatorics of Discriminantal Arrangement, Japanese Conference on Combinatorics and its Applications (JCCA-2019), 2019/08, National Institute of Technology(KOSEN), Miyazaki College (https://sites.google.com/site/jccadmiasg2019/home )
[9] Combinatorics of the Discriminantal arrangement and Pappus' theorem, Discrete Geometric Structure Seminar, 2019/04, Hokkaido University (https://sites.google.com/view/dgs-seminar-26-yamagata )
[8] Pappus’ theorem in Grassmannian, On hyperplane arrangements, configuration spaces and related topics, 2019/02, Hokkaido University (https://sites.google.com/site/toriellimichelemaths/home/research/on-hyperplane-arrangements-configuration-spaces-and-related-topics)
[7] Generalization of braid arrangement and its combinatorics, The 24th Algebra Symposium for Young Researchers, 2019/02, University of Tokyo (https://sites.google.com/site/daisuuwakate2019/)
[6] Generalization of braid arrangement and its combinatorics, MSJ (The Mathematical Society of Japan) Autumn meeting 2018, 2018/09, Okayama University (http://mathsoc.jp/en/meeting/okayama18sept/)
[5] Combinatorics of discriminantal arrangement and Pappus' theorem, PISA-HOKKAIDO-ROMA2 Summer School on Mathematics and Its Applications, 2018/08, Centro di Ricerca Matematica Ennio De Giorgi, Scuola Normale Superiore di Pisa (http://crm.sns.it/course/5648/)
[4] Generalization of Braid arrangement and its combinatorics, COmbinatorics Summer school 2018 (COS 2018), 2018/08, Shizuoka (https://sites.google.com/view/cos2018)
[3] Discriminantal arrangement, Plucker matrix and hypersurfaces in Grassmannian, The 15th Mathematics Conference for Young Researchers, 2018/03, Hokkaido University (http://www.math.sci.hokudai.ac.jp/~wakate/mcyr/2018/index.html)
[2] Discriminantal Arrangement, 3×3 Minors of Plücker Matrix and Hypersurfaces in Grassmannian Gr(3,n), Discrete Geometric Structure Seminar, 2018/01, Hokkaido University (https://sites.google.com/view/20180125yamagata )
[1] Lattice of discriminantal arrangement and 3×3 matrices of Plücker coordinate matrix, PISA-HOKKAIDO Summer School on Mathematics and Its Applications, 2016/09, Aula Dini, Scuola Normale Superiore, Pisa (http://crm.sns.it/course/5127/).
Poster
[5] On discrete relative homotopy groups, 9th Mexican Workshop on Applied Geometry and Topology, online, 2023/11/10 (https://9mwgeometrytopology.eventos.cimat.mx/home_9atd)
[4] Combinatorics of the discriminantal arrangement, Hyperplane arrangements and Japanese Australian workshop on Real and Complex Singularities, University of Tokyo, 2019/12/05, Tokyo ,(http://www.rimath.saitama-u.ac.jp/lab.jp/Fukui/JARCS8/JARCS8.html, https://sites.google.com/umich.edu/hyper-jarcs/home)
[3] Discriminantal arrangement and quadric in Grassmannian, Hokkaido University Day, Zhejiang University, 2018/03, Hangzhou
[2] Lattice and 3×3 matrices of Plücker coordinate matrix, 3rd MD(Tohoku) × ALP(Hokkaido) Joint Symposium, 2017/05, Miyagiken, (https://ambitious-lp.sci.hokudai.ac.jp/report/event/repo_9614.html)
[1] Lattice and 3×3 matrices of Plücker coordinate matrix, The 4th International Symposium on AMBITIOUS LEADER’S PROGRAM Fostering Future Leaders to Open New Frontiers in Materials Science, 2016/11, Hokkaido (http://ambitious-lp.sci.hokudai.ac.jp/information/7650.html).
Committee Memberships
[3] The 16th Mathematics Conference for Young Researchers, Organizer (2019/04-2020/03) (http://www.math.sci.hokudai.ac.jp/~wakate/mcyr/2020/ja/index.html )
[2] The 15th Mathematics Conference for Young Researchers, Organizer (2018/04-2019/03) (https://www.math.sci.hokudai.ac.jp/~wakate/mcyr/2019/ja/index.html )
[1] The 4th ALP-MD symposium, Representative (2017/12- 2018/ 05)
Grants
[7] Topological study of hyperplane arrangements by the method of discrete homotopy theory, Grant-in-Aid for Young Scientists, 24K16926, 2024/04/01-2028/03/31
[6] Topological study of hyperplane arrangements by the method of braid monodromy, Recommended Research Projects, Fukuoka University, 237402, 2023/07/01-2024/03/31
[5] Discriminantal arrangement and its combinatorics, Grant-in-Aid for JSPS Fellows, 20J10012, 2020/04-2022/03
[4] Clarification of a structure of higher codimension of Discriminantal arrangement and its application,
Research grant for research abroad, Ambitious Leader's program (Hokkaido U.), 2020/02-2021/03
[3] Discriminantal arrangement and its combinatorics,
Competitive research grant, Ambitious Leader's program (Hokkaido U.), 2019/06-2020/03
[2] Combinatorics of Discriminantal arrangement and generalization of Pappus' theorem,
Competitive research grant, Ambitious Leader's program (Hokkaido U.), 2018/06-2019/03
[1] Hyperplanes in Discriminantal Arrangement and 3 by 3 Minors of Plücker Matrix and Grassmannian Gr(3,n),
Competitive research grant, Ambitious Leader's program (Hokkaido U.), 2017/06-2018/03
Awards
[2] Graduate School of Science, Excellent Research Encouragement Award, Graduate School of Science, Hokkaido University, 2019/04 (http://www.math.sci.hokudai.ac.jp/topics/2019-4-11.php )
[1] Poster award, 3rd MD(Tohoku University) × ALP(Hokkaido University) Joint Symposium, 2017/05
Others
[2] Discriminantal Arrangement, 3×3 Minors of Plücker Matrix and Hypersurfaces in Grassmannian Gr(3,n), master thesis, 2017
[1] COUNTING CHAMBERS IN A FLAT, graduation poster, 2016