古いお知らせ

• 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）。