Recent and Coming Talks

• TBA. The 4th Franco-Japanese-Vietnamese Singularities, 7-11 November 2016, Chambery.
• Euler characteristics in enumerative combinatorics
  • Colloquium, Universite de Bourgogne , March 10, 2016.
  • AMC2016 Bali, July 28, 2016.
• Linial arrangements and Eulerian polynomials
  • SCHA, August 8, 2016.
  • Special Session on Topology and Combinatorics of Arrangements (in honor of Mike Falk), Spring Eastern Sectional Meeting State University of New York at Stony Brook, Stony Brook, NY. March 19-20, 2016.
• Euler characteristic reciprocity for chromatic and order polynomials (PDF File (Nice))
  • 幾何学コロキウム, July 1, 2016, 北大.
  • 特異点の大域的研究, June 22, 2016, 神戸.
  • SINGULARITIES AND TOPOLOGY, March 7-9, 2016, Nice.
• Functorizations of enumerative problems
  • 北大・KAIST合同ワークショップ, 6 Jan. 2016. Hokkaido University.
• 超平面配置とオイラー多項式
  • 代数学セミナー, 広島大学 5 June 2015.
  • 幾何学・組合せ論に現れる環と代数構造, RIMS 11 June 2015. Pisa, Italy.
• Worpitzky partition, Eulerian polynomial and Linial arrangements.
  • Seminar of the session "Algebraic topology, geometric and combinatorial group theory", 12 Feb. 2015. Pisa, Italy.
• Zero recognitions for periods and holonomic real numbers.
  • The 1st Workshop of JSPS-MAE Sakura Program "Geometry and Combinatorics of Hyperplane Arrangements and Related Problems", 5 Sep. 2014. Sapporo
• Milnor fibers and semi-algebraic stratifications for real line arrangements.
  • NCTS (South) Geometry Conference, 3 July, 2014. PDF file
  • 代数幾何学セミナー, 東北大学, 11 July 2014.
  • 城崎代数幾何学シンポジウム, 城崎, 24 Oct. 2014. PDF file
• Aomoto complex and real 4-nets.
  • 代数幾何セミナー, 北海道大学, April 14, 2014.
  • Topology of arrangement of hyperplanes and hypersurface singularity, 東京理科大学, April 26, 2014.
• Milnor fibers of real line arrangements, PDF file (for Conference at Nice).
  • NEW PERSPECTIVES IN HYPERPLANE AND REFLECTION ARRANGEMENTS, Bochum, 10 Feb., 2014
  • 離散群と双曲空間の複素解析とトポロジー, RIMS, 22 Jan., 2014 PDF File
  • The 1st Franco-Japanese-Vietnamese Symposium on Singularities, Nice, 2013年9月16〜21日
  • Combinatorial Methods in Topology and Algebra, Corotna, 2013年9月9日〜13日
  • Sapporo Pacific RIM (1 Jul., 2013), Shangai, PRIMA 2013 (27 June, 2013), Hiroshima, Algebra Seminar (7 June, 2013), Zaragoza University (12 and 21 Sep., 2012), University of Nice (10 Oct. 2012), Universidad Complutense de Madrid (19 Oct. 2012), Hokkaido University (2 Nov. 2012), Tokyo University of Agriculture and Technology (7 Nov. 2012), Kumamoto University (16 Nov. 2012).
• Computational complexity of real numbers and the zero-recognition problem for periods, 2012年11月29日, 数論幾何学セミナー 北海道大学
• Introduction to Hyperplane Arrangements, Sep. 17 , 12th Zaragoza-Pau Conference on Mathematics (Jaca, Spain)
• Freeness of hyperplane arrangements and divisors. (3 lectures) Arrangements in Pyrenees, 11 - 15, June 2012.
• 直線配置のモジュライ空間の連結性について. 北大談話会. 2012年5月10日.



• (with Takuro Abe) What makes arrangements free? Hyperplane arrangements and applications, PIMS, Vancouver, 2011年8月8日--12日.
• 直線配置のトポロジー, 京都大学談話会, 2011年6月22日.
• Minimal Stratifications for Line Arrangements. (Slide (PDF) from Pisa Talk )
  • 広島大学 トポロジー・幾何セミナー, 広島大学, Nov. 15, 2011.
  • Singularity Theory Conference, University of Science and Technology of China, Hefei, July 25--31, 2011.
  • Tuesday Seminar on Topology, The University of Tokyo, May 24, 2011.
  • The 6th Kagoshima Algebra-Analysis-Geometry Seminar, Kagoshima University. Feb 13--17, 2011.
  • Workshop on Geometry and Analysis of Discriminants, IPMU, Feb 7--8, 2011.
  • Combinatorial and Geometric aspects of Hyperplane Arrangements, Centro di Ricerca Matematica ``Ennio De Giorgi'' Pisa, May 25, 2010.
• On the irreducibility of moduli spaces of line arrangements. (Slides from talk at Northeastern, Boston. Apr. 8 2011.)
  • The Algebraic Geometry and Topology of Hyperplane Arrangements, Northeastern University, Boston, April 8, 2011.
  • Branched Coverings, Degenerations, and Related Topics, Tokyo Metropolitan Univ., Mar. 7--10, 2011. ,
  • Topology of singularities and related topics, II, Tohoku University, January 5 - 9, 2011.
• 周期と実数の計算論的複雑性について (Slide (PDF File) from Shinshu Talk Oct. 16 2009.)
  • 東京理科大学理工学部数学科談話会, January 12, 2011.
  • Workshop "Category Theory, Computer Science and Topology, 信州大学, October 18, 2009.
  • 大阪大学整数論＆保型形式セミナー, October 16, 2009.
• On the free arrangements and truncated affine Weyl arrangements.
  KAIST Discrete Math Seminar, KAIST, Daejeon, Korea, 2010年10月26日. (Video)
• Modules of logarithmic derivations and applications to enumerative problems of hyperplane arrangements.
  2010 Global KMS International Conference, POSTECH, Korea, Oct 22, 2010
• Minimal presentations for the fundamental groups of the complement of hyperplane arrangements.
  • Interplay between representation theory and geometry, Beijing, China, May 3-7, 2010. Scanned Note,
  • SEMINARIO DI GEOMETRIA, Universita di Pisa, Italy, April 15, 2010.
  • Topology of Singularities and the related geometry, Hanoi, March 23, 2010.
• 超平面配置のトポロジー：極小セル分割とその周辺 Slide PDF
  北海道大学談話会, 北海道大学, Feb 18, 2010.
• Orlik-Solomon 代数と青本複体の Chamber 基底
  超幾何方程式研究会 2010, 神戸大学, Jan 7, 2010. (MPEG files: 1(415MB), 2(91MB) )

• 巡回篩現象入門, JMO 夏期セミナー, 2013年8月25日
• 扱いやすい実数・扱いにくい実数、北海道大学オープンキャンパス, 2013年8月5日, 6日
• 観察から始まる数学---巡回篩現象入門, ガロア祭, 京都大学理学部, May 27, 2011. (講演ファイル)