古いお知らせ

• Talk: Algebraic Lie Theory and Representation Theory 2024 (ALTReT2024) (阿蘇休暇村 17-20 May 2024)
• Workshop: Multiarrangements of type B_2 and related topics (Osaka U, 26-27 March 2024)
• Conference: Algebraic Geometry, Topology, Combinatorics and Related Topics 2024 Osaka U, 23-25 March 2024
• Talk: 日本数学会2024年度年会 (Osaka Metropolitan Univ. 16-20 March 2024)
• Talk: Artin Groups and Arrangements - Topology, Geometry, and Combinatorics (MSRI, 11-15 March 2024)
• Talk: 第8回代数幾何学研究集会−宇部− (9-10 March 2024)
• Talk: 研究集会「パーシステントホモロジーと表現論」 Zoom (22 February 2024)
• Talk: 超幾何方程式研究会 2024 (Kobe, 5-7, Jan. 2024)
• Conference: Hyperplane Arrangements 2023 (Rikkyo Univ. 11-15, Dec. 2023)
• Conference: Magnitude 2023 (Osaka 4-8, Dec. 2023) (Colloguium talk by Tom Leinster in 4 Dec. Workshop 5-8).
• Dr. Emily Roff started postdoc in Osaka.
• Preprint: (with Misha Feigin and Zixuan Wang) Integral expressions for derivations of multiarrangements. arXiv:2309.01287
• Preprint: (with Akihiro Higashitani and Satoshi Murai) Ehrhart quasi-polynomials and parallel translations. arXiv:2307.08151
• 2023/11/13-17, 辻栄周平先生集中講義「超平面配置とグラフの代数的組合せ論」（大阪大学）
• 2023/11/06-10, 集中講義（Bologna大学）
• 2023/11/01, TBA, 名古屋大学談話会
• 2023/10/16-20, 永野中行先生集中講義「K3曲面の周期写像とモジュラー形式について」（大阪大学）
• 2023/09/11-15, Workshop "Topology of Singularities and Related Topics" (Quy Nhon, Vietnam)
• Combinatorial Hodge Theory 関係の勉強会（企画中） 2023年8月か9月
• What is -Q for a poset Q? Poset Combinatorics, Minisymposium of ICIAM 2023 Tokyo.
• Hyperplane arrangements and enumerative problems. Minisymposium of ICIAM 2023 Tokyo.
• 2023/06/21, 「形を数える〜トポロジーと組合せ論の交差点〜」 大阪大学サイエンスナイト
• Conference:
• Talk: Topological and enumerative problems of hyperplane arrangements (3 lectures, PDF File) Algebraic and topological interplay of algebraic varieties 12-17 June 2023, Jaca, Spain
• 2023/05/25 大阪府立生野高等学校の学生の皆さんに研究室見学をしていただきました。
• ときどき Order Seminar を開催しています。(2023/05/18)
• 2022/07/11 今後のスケジュールや参加するかもしれない研究集会情報 （参加しないものも含む）を 今後の予定 に まとめ始めました。（一度更新をしたら、その後はあまり確認をしないと思い ますので、不正確な情報もある可能性があります。）
• Talk: TBA, 今井淳先生還暦記念研究集会, 千葉大学 20 March 2023,
• We are organizing Various Guises of Reflection Arrangements (13 - 17 Mar 2023, Edinburgh)
• Talk: TBA Real, Complex, and Symplectic Reflection Groups March 2023, Bochum
• Preprint: (with Yu Tajima) Causal order complex and magnitude homotopy type of metric spaces. arXiv:2302.09752
• Talk: TBA 大阪大学談話会 30 Jan. 2023,
• We are organizing Combinatorics, geometry and commutative algebra of hyperplane arrangements (16 - 20 Jan. 2023, Kyushu University)
• We are organizing Workshop on Magnitude 2022 (22 - 23 Dec. 2022, Osaka)
• 雑誌数学セミナー特集記事：ホ・ジュニ. 特集「国際数学者会議2022 ――フィールズ賞業績紹介」, 数学セミナー2023年1月号.
• いろいろ(含アウトリーチ関係)更新しました(2022/09/19)
• We are organizing Various Guises of Reflection Arrangements (13 - 17 Mar 2023, Edinburgh)
• Talk: TBA Characteristic Polynomials of Hyperplane Arrangements and Ehrhart Polynomials of Convex Polytopes RIMS
• Talk: TBA, 有限群論，代数的組合せ論，頂点代数の研究 (RIMS)
• Talk: TBA, トポロジー火曜セミナー, 東京大学 (Zoom)
• Preprint: (with Suguru Ishibashi, and Sakumi Sugawara) Betti numbers and torsions in homology groups of double coverings. arXiv:2209.02236
• I join the editorial board of Order (Jul. 2022).
• Talk: Vassiliev filtration and Varchenko-Gelfand filtration (2022/09/22) Japan-Vietnam Singularity Seminar (Zoom)
• Talk: 20・12 面体配置と関連する二重被覆空間, 日本数学会2022年度秋季総合分科会 (北海道大学) 2022/09/13
• 2022/04/01 大阪大学へ引っ越しました。
• We are organizing Workshop "Singularities, arrangements, and low-dim. topology" (6 - 10 Dec. 2021, Zoom)
• We are organizing Workshop "Branched coverings, Degenerations, and Related Topics 2022" (7-8 March 2022, Zoom)
• We are organizing Arrangements in Lugano (27 June - 1 July, 2022, Lugano, Switzerland)
• Talk: 数え上げ関数から見た空間の形, 18-19 December 2021 岡シンポジウム (奈良女子大学, Zoom)
• Preprint: (with Takuro Abe, Naoya Enomoto and Misha Feigin) Free reflection multiarrangements and quasi-invariants. arXiv:2112.06738
• Preprint: (with Yu Tajima) Magnitude homology of graphs and discrete Morse theory on Asao-Izumihara complexes. arXiv:2110.02458
• Preprint: (with Christopher de Vries) Ehrhart quasi-polynomials of almost integral polytopes. arXiv:2108.11132
• Preprint: (with Akihiro Higashitani, Tan Nhat Tran) Period collapse in characteristic quasi-polynomials of hyperplane arrangements. arXiv:2105.02367
• Talk: 数え上げ準多項式の代数と幾何. 東北大学代数セミナー (Zoom), 22 October 2021.
• Talk: Geometry of arrangements and enumerative problems. RIMS x OIST Jointly-funded Workshop: "Interactions of New Trends in Algebraic Geometry and Singularities" 11, 12, October 2021 OIST 数理理論物理学ユニット
• Talk: Holonomic constants and the equality decision problem. Eighteenth International Conference on Computability and Complexity in Analysis 26 July, 2021.
• 北海道大学の学生向け連絡：2021年の前期のオフィスアワーをZoomで 毎週金曜日12:30-13:30に行う予定です。詳細はELMSの下記ページをご覧ください。（終わりました）
  https://moodle.elms.hokudai.ac.jp/course/view.php?id=102392 (2021/04/13)
• We are organizing Arrangements at Home IV (Zoom, 30 June - 2 July, 2021)
• Preprint: (with Sakumi Sugawara) Divides with cusps and Kirby diagrams for line arrangements. arXiv:2103.15262
• Preprint: (with Kyosuke Higashida) Feynman graphs and Hyperplane arrangements defined over $\mathbb{F}_1$. arXiv:2103.15661
• 北海道大学の学生向け連絡：2020年の後期のオフィスアワーは 毎週木曜日12:30-13:30の予定す、詳細はELMS の下記ページのをご覧ください。
  https://moodle.elms.hokudai.ac.jp/course/view.php?id=89660 (2020/10/17)
• Talk: A geometric realization of combinatorial reciprocity of order polynomials. 18 January 2021. OBERSEMINAR ARRANGEMENTS AND SYMMETRIES (Bochum, Germany) (Online)
• Preprint: (with T. Yoshida) What is $-Q$ for a poset $Q$? arXiv:2102.00566
• Preprint: (with M. Tsukamoto, M. Tsutaya) $G$-index, topological dynamics and marker property. arXiv:2012.15372
• Preprint: (with Daisuke Suyama) The primitive derivation and discrete integrals. arXiv:2009.13710
• Talk: A q-deformation of Aomoto complex. 11 June 2020. Arrangements at Home II (Online)
• Preprint: (with Kentaro Akasaka, Suguru Ishibashi) Finite record sets of chip-firing games. arXiv:2005.00822 (2020/05/06)
• We are organizing 2020/06/23-07/03, (2021年6月に延期→ 2022年に延期) Arrangements in Fribourg (2020/05/06)
• 2020/07/06-10, (中止) (Hokkaido Summer Institute + Workshop) Recent topics in metric spaces: magnitude and persistent homology (Lecturers: Hiraoka, Leinster, Willerton, others). (2020/05/06)
• Talk: Quantum Math, Singularities and Related Topics, OIST, 2021/02/08-12 (schedule changed). ,
• (CANCELLED) We are organizing 2020/03/06-10, Branched Coverings, Degenerations, and Related Topics 2020 (徳島大学)
• Talk: TBA 第15回代数・解析・幾何学セミナー(鹿児島大学)
• We are organizing Hyper-JARCS (Papadima Memorial Conference) 2-6, Dec 2019. Tokyo (Organizers: Alexandru Dimca, Toshizumi Fukui, Toshitake Kohno, Laurentiu Paunescu, Alexander Suciu, Masahiko Yoshinaga)
• Qiu Yu visits us. (3-15 Dec 2019)
• Preprint: Eulerian polynomials for subarrangements of Weyl arrangements by Ahmed Umer Ashraf, Tan Nhat Tran, Masahiko Yoshinaga. arXiv:1911.01650
• Talk: 20・12面体と超平面配置のミルナーファイバー, 幾何学コロキウム (北大), 2019/10/04.
• Talk: TBA 2019年度ホモトピー論シンポジウム (北大), 2019/10/27-29.
• Talk: TBA Categorical and Analytic Invariants in Algebraic Geometry VII (Osaka), 2019/11/25-29
• Preprint: Double coverings of arrangement complements and 2-torsion in Milnor fiber homology. by Masahiko Yoshinaga. arXiv:1902.06256
• Talk: Icosidodecahedron and Milnor fiber of arrangements Workshop on Hyperplane Arrangements and Reflection Groups, 2019/09/23-27
• Talk: 20・12面体と超平面配置のミルナーファイバー, JCCA 2019, 2019/08/27-29.
• Talk: Icosidodecahedron and Milnor fiber of arrangements Hyperplane Arrangements in Wakkanai, 2019/08/21-23
• Talk: A threshold of length in magnitude homology, in Magnitude 2019, 4 - 5 July, 2019, Edinburgh.
• Talk: Enumerative aspects of G-Tutte polynomials, in SIAM - Conference on Applied Algebraic Geometry, 9 - 13 July, 2019, Bern
• We are organizing Hokkaido Summer Institute "Recent progress in matroids and Tutte polynomials" (Main lecturers: Graham Denham and Luca Moci) Lectures 22-25 and Workshop 25-26, July 2019.
• Ahmed Umer Ashraf visits us with the support by The Mitacs Globalink Research Award (May-July 2019)
• Talk： CIMPA School, Hyperplane Arrangements: Recent Advances and Open Problems, Hanoi, 11-22, March 2019.
• We are organizing Branched Coverings, Degenerations, and Related Topics 2019 5-8, March 2019, Hiroshima University.
• We are organizing On hyperplane arrangements, configuration spaces and related topics 20-22, Feb. 2019. 北海道大学数学教室
• Preprint: A Hodge filtration of logarithmic vector fields for well-generated complex reflection groups. by Takuro Abe, Gerhard Rohrle, Christian Stump, Masahiko Yoshinaga. arXiv:1809.05026
• 講演：マグニチュードとポセットトポロジー, 数理経済談話会, 信州大学, 4 Feb. 2019.
• 講演：Matroids, Tutte polynomial, and generalizations. Free divisors and Hyperplane arrangements, Paris 7, 17-19 Dec. 2018.
• Talk: 超平面配置と特性準多項式 名古屋工業大学, 6 Dec. 2018.
• We are organizing Categorical and Analytic Invariants in Algebraic Geometry �Y 26-30, Nov. 2018. 北海道大学数学教室
• 講演：組合せ論的相互律とオイラー標数 東北大学　代数幾何セミナー, 2 Nov. 2018.
• Elisa Palezzato starts JSPS Postdoc (till September 2020). (Oct 2018)
• 又吉直樹のヘウレーカ！「夜の標識 光って見えるのはなぜ？」 (NHK Eテレ) 2018年5月30日22:00-22:45, (再放送：6月1日午前0:30-1:15, 6月3日午前0:00-0:45)
• Preprint: (with Tan Nhat Tran) Combinatorics of certain abelian Lie group arrangements and chromatic quasi-polynomials. arXiv:1805.03365. (May 9 2018)
• Research Activity (英語版)を 書き直しました。
• I modified Research Activity.
• We are organizing Matroids, Reflection Groups, and Free Hyperplane Arrangements 11-15 , June 2018, RIMS, Kyoto University.
• Preprint: (with Ryuki Kaneta) Magnitude homology of metric spaces and order complexes arXiv:1803.04247. (March 1 2018)
• Delphine Pol has arrived in Sapporo. She is staying here till September 2018 (JSPS Postdoc).
• 2017年10月から 離散幾何構造セミナー を不定期に開催します. 多くの方のご参加をお待ちしています.
• 「研究内容」を大幅に書き直しました。
• We are organizing 研究集会「不変式・超平面配置と平坦構造」 9--10, Nov. 2017. 北海道大学数学教室
• We are organizing Advances in Hyperplane Arrangements 16--18, Aug. 2017. Bremen, Germany.
• Preprint: (with Ye Liu and Tan Nhat Tran) G-Tutte polynomials and abelian Lie group arrangements. arXiv:1707.04551.
• 平成29年度文部科学大臣表彰若手科学者賞. 研究業績：超平面配置の研究 (2017年4月)
• Preprint: (with Pauline Bailet, Alexandru Dimca) A vanishing result for the first twisted cohomology of affine varieties and applications to line arrangements. arXiv:1705.06022 (17 May 2017)
• We are organizing series of conferences in honor of Prof. Mario Salvett's 60: Perspectives in Algebraic Topology (5. June 2017) and Arrangements and Beyond (6-9, June 2017). Both are held in Pisa, Italy.
• 「超平面配置や二次曲線配置の実構造を使った研究」(日本学術振興会 国際共同研究加速基金)の活動の一環で 一年間ドイツのBremen大学(ALTA) に滞在します(Aug 2016 - 20 Sep 2017). (I am staying in Bremen (ALTA) for one year (Aug 2016 - 20 Sep 2017).)
• We are organizing Hyperplane Arrangements and related topics 13--14, Feb. 2017.
• Preprint: (with Kazuki Iijima, Kyouhei Sasaki, and Yuuki Takahashi) Eulerian polynomials and polynomial congruences. arXiv:1611.10147 (30 Nov. 2016)
• Preprint: Characteristic polynomials of Linial arrangements for exceptional root systems. arXiv:1610.07841. (26 Oct. 2016)
• We are organizing Summer Conference on Hyperplane Arrangements in Sapporo (Poster) (8-12 Aug. 2016)
• We are organizing Workshop on Hyperplane Arrangements and Singularity Theory, Hokkaido University. 22-25, Mar. 2016.
• Preprint: Euler characteristic reciprocity for chromatic and order polynomials. (with Takahiro Hasebe) arXiv:1601.00254 (5 Jan. 2016).
• Preprint: Vanishing results for the Aomoto complex of real hyperplane arrangements via minimality. (with P. Bailet) arXiv:1512.05318 (17 Dec. 2015).
• Hokkaido-Pisa Summer Schoolが行われます。2015年7月27日〜8月7日は数理経済、微分方程式、微分幾何がテーマで、8月24日〜9月4日は超平面配置がテーマです。
• 日本学術振興会に申請していたフランスとの二国間交流事業(JSPS-MAE Sakura Program) 「超平面配置の幾何、組合せ論および関連する諸問題」が採択されました。 2014年9月から二年間の予定です。(2014.3.17)
• Our joint project "Geometry and combinatorics of hyperplane arrangements and related topics" with team in Pau (JSPS-MAE Sakura Program) is approved. (Sep. 2014--Aug. 2016).
• 村井聡先生の集中講義「凸多面体の数学入門」が後期に行われます(北大, 2015年12月21日〜25日)。
• Juan Viu Sos stays in Hokkaido Univ. (8 - 19 Dec. 2015)
• Preprint: Chromatic functors of graphs. arXiv:1507.06587 (Jul. 24, 2015).
• We are organizing a small workshop Problems Around Hyperplane Arrangements, Hokkaido University 18 June 2015.
• Daniele Faenzi stays in Hokkaido Univ. (17 June - 13 July 2015)
• 2015年6月1日〜5日に 広島大学で集中講義をします。題目は超平面配置入門です。
• We are organizing Arrangements of plane curves and related problems, Tokyo Metropolitan University. 16-18, Mar. 2015.
• Max Wakefield stays in Hokkaido Univ. (24 March - 19 June 2015)
• Preprint: Worpitzky partitions for root systems and characteristic quasi-polynomials. arXiv:1501.04955 (Jan 21, 2015).
• Primitive Forms, Mirror Symmetry and Related Topics 2014
• Pauline Bailet has arrived at Sapporo. (1 Nov 2014)
• 10月27日〜31日に 東京大学で集中講義をします。題目は超平面配置入門です。
• Michele Torielli has moved to Torino. (23 Oct 2014)
• We are organizing First Workshop of JSPS-MAE Sakura Program "Geometry and Combinatorics of Hyperplane Arrangements", Hokkaido University. 1-5, Sep. 2014.
• We are organizing The 2nd Franco-Japanese-Vietnamese Symposium on Singularities, Hokkaido University, 25-29 Aug. 2014. (Chair: Ohmoto)
• We are organizing Recent developments on geometrical and algebraic methods in Economics, Hokkaido University, 22-24 Aug. 2014. (Chair: Settepanella)
• 竹内潔先生の集中講義「代数解析の特異点理論への応用」が行われました (6月16日〜20日)
• Professor Alexandru Dimca is visiting us 6-17 May 2014.
• プレプリントをArXivに置きました（2014.4.22）
  Resonant bands, Aomoto complex, and Real 4-nets. (With M. Torielli) arXiv:1404.5014, Preprint, Apr. 22, 2014.
• プレプリントをArXivに置きました（2013.12.9）
  Degeneration of Orlik-Solomon algebras and Milnor fibers of complex line arrangements. (with P. Bailet) arXiv:1312.1771, Preprint, Dec. 9, 2013.
• プレプリントをArXivに置きました（2013.11.11）
  On the admissibility of certain local system. (by Shaheen Nazir, Michele Torielli and Masahiko Yoshinaga) arXiv:1311.1848
  
• We are organizing AMS Special Session on Hyperplane Arrangements and Applications Baltimore, USA
• I submitted a preprint (2013.11.17):
  Resonant bands, local systems and Milnor fibers of real line arrangements. PDF.
• We are organizing a conference Hyperplane Arrangements and Characteristic classes in RIMS, Kyoto University, 11-15, November.
• The file of my talk "Milnor fibers of real line arrangements" in 1st FJV Singularity is here.
• ピサ大学、ニース大学に滞在しました（2013年9月3日〜9月28日）。
• 2013年8月21日〜23日に北海道大学数学教室で 代数多様体のトポロジーとその周辺 を開催しました。予想外に多数の方に参加して頂きありがとうございました。
• Simona Settepanella さんが着任されました（2013年8月1日）。
• Mario Salvetti (5-10 July 2013), June Huh (5-9 July) and Shaheen Nazir (1 July - 7 Aug.) visited us.
• 原岡喜重氏による表現論セミナー「超平面配置の補空間に対するrigidity指数」 を2013年1月21日(16:30--18:00)に行います。
• プレプリントをArXivに置きました（2013.1.10）。
  Milnor fibers of real line arrangements. arXiv:1301.1430
  Resonant bands and local system cohomology groups for real line arrangements. arXiv:1301.1888,
• プレプリントをArXivに置きました（2012.12.17）。
  Freeness of hyperplane arrangements and related topics. arXiv:1212.3523
• ��橋篤史氏による集中講義を後期（２０１２年１２月１０日〜１４日）に 行います。初日は14:45-16:15に全体の概要をお話ししていただき、講義は 月16:30-18:00, 火水木14:45-16:15, 金8:45-10:15 の日程で行います。 (11月5日)
• サラゴサ大学に滞在しました（2012年9月2日〜10月21日）。