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講演記録 (2000-) 


  1. Zariski pairs on a cubic surface
    日本数学会中四国支部例会
    January 21, 2024
    徳島大学

  2. Topology of a double plane branching along a real line arrangement
    Seminar talk at Dalat University
    December 8, 2023
    Dalat, Vietnam

  3. Vanishing cycles of a double plane branching along a real line arrangement
    Workshop "Topology of Singularities and Related Topics"
    September 11, 2023
    Quy Nhon, Vietnam

  4. Conway theory for algebraic geometers
    Working Workshop on Calabi--Yau Varieties and Related Topics 2023
    July 22, 2023
    Hokkaido University

  5. K3曲面の自己同型群の計算について
    杉本代数セミナー
    July 14, 2023
    大阪公立大学杉本キャンパス

  6. あるK3曲面の自己同型群について
    K3, Enriques Surfaces, and Related Topics
    March 23, 2023
    名古屋大学多元数理研究科

  7. The automorphism group of a K3 surface birational to a double plane
    Real Aspects of Geometry
    November 4, 2022
    CIRM, Luminy, France

  8. Mordell-Weil groups of a certain K3 surface
    slides
    Recent Development in Algebraic Geometry
    August 30, 2022
    National University of Singapore
  9. Lectures: Computational tools in the study of K3 surfaces
    July 11--15, 2022
    Graduate School of Mathematics, Nagoya University
    Lecture Notes

  10. Automorphism groups of Enriques surfaces (joint work with Simon Brandhorst)
    slides
    Japanese-European Symposium on Symplectic Varieties and Moduli Spaces -- Sixth Edition
    March 16, 2022
    Zoom
  11. Computation of automorphism groups of Enriques surfaces (joint work with Simon Brandhorst)
    slides
    ODTU-Bilkent Algebraic Geometry Seminar
    December 17, 2021
    Zoom
  12. Computation of the nef cone and the automorphism group of an Enriques surface (joint work with Simon Brandhorst)
    slides
    Online Workshop on Calabi-Yau Varieties and Related Topics
    October 14, 2021
    Zoom
  13. Computation of automorphism groups of K3 and Enriques surfaces
    slides
    proceedings
    代数学シンポジウム
    September 04, 2019
    東北大学
  14. The automorphism groups of Enriques surfaces covered by a Jacobian Kummer surface
    Seminar talk
    May 15, 2019
    Saarland University
  15. The automorphism groups of Enriques surfaces covered by a Jacobian Kummer surface
    Seminar talk
    May 14, 2019
    Johannes Gutenberg University Mainz
  16. The automorphism groups of Enriques surfaces
    Seminar talk
    February 21, 2019
    Vietnam National University of Science, Hanoi, Vietnam
  17. Enriques involutions on singular K3 surfaces of small discriminants (joint work with Davide Cesare Veniani)
    Arithmetic and Algebraic Geometry 2019
    January 21, 2019
    University of Tokyo
  18. The elliptic modular surface of level 4 and its reduction modulo 3
    Algebraic Geometry in Positive Characteristic and Related Topics
    December 20, 2018
    University of Tokyo
  19. The elliptic modular surface of level 4 and its reduction modulo 3
    Working Workshop on Calabi-Yau Varieties and Related Topics
    August 10, 2018
    Gakushuin University
  20. An even extremal lattice of rank 64
    組合せ論セミナー
    December 22, 2017
    東北大学情報科学研究科 Graduate School of Information Sciences, Tohoku University
  21. An Enriques involution of the Fermat quartic surface in characteristic 3
    K3 surfaces and Realted Topics
    December 21, 2017
    Nagoya University
  22. Lectures: On Zariski-van Kampen theorem
    November 29- December 2, 2017
    Tribhuvan University, Kirtipur, Nepal
  23. Rational double points on complex Enriques surfaces
    Geometry and Representation Theory Seminar
    25 September, 2017
    Queen's University, Kingston, Canada
  24. Rational double points on complex Enriques surfaces
    Workshop on Calabi-Yau manifolds: Arithmetics, Geometry and Physics
    08 August, 2017
    Gakushuin University
  25. Automorphisms of K3 surfaces and Enriques surfaces
    slides
    Hakodate workshop on arithmetic geometry 2017
    29 May, 2017
    Hakodate
  26. On an Enriques surface associated with a quartic Hessian surface
    Oberseminar Algebraische und Arithmetische Geometrie
    04 May, 2017
    Leibniz Universit"at Hannover
  27. On an Enriques surface associated with a quartic Hessian surface
    "Algebraic Geometry Conference"
    29 Mar, 2017
    Haeundae, Busan

  28. On an Enriques surface associated with a quartic Hessian surface
    "Topology of Singularities"
    21 Feb, 2017
    Vietnam Institute for Advanced Study in Mathematics, Hanoi

  29. Connected components of the moduli of elliptic K3 surfaces
    "The 10th Arithmetic and Algebraic Geometry"
    14 Dec, 2016
    The University of Tokyo

  30. Connected components of the moduli of elliptic K3 surfaces
    slides
    "The 4th Franco-Japanese-Vietnamese Singularities"
    09 Nov, 2016
    University Savoie Mont Blanc, Chambery

  31. A smooth quartic surface containing 56 lines
    slides
    "Algebra, geometry and topology of singularities"
    13 May, 2016
    Galatasaray University, Istanbul

  32. Computer-aided calculations in the study of K3 surfaces
    slides
    Colloquium talk
    17 March, 2016
    Vietnam National University, Hanoi

  33. Automorphisms of supersingular K3 surfaces and Salem polynomials
    "Conference on K3 surfaces and related topics"
    16 November, 2015
    KIAS, Seoul

  34. On the topology of projective subspaces in complex Fermat varieties
    "Geometry, Topology and Combinatorics of Hyperplane Arrangements and Related Problems"
    16 September, 2015
    Facultad de Ciencias, Universidad de Zaragoza, Spain

  35. Automorphisms of supersingular K3 surfaces and Salem polynomials
    Tsuda College Mini-Workshop "Calabi-Yau Varieties: Arithmetic, Geometry and Physics"
    07 August, 2015
    Tsuda College, Tokyo

  36. On the topology of projective subspaces in complex Fermat varieties (joint work with Alex Degtyarev)
    Workshop "Motives and Algebraic Geometry"
    29 May, 2015
    Hokkaido University, Sapporo

  37. Holes of the Leech lattice and projective models of K3 surfaces
    Arithmetic and Algebraic Geometry 2015
    28 January, 2015
    Graduate School of Mathematical Sciences, The University of Tokyo

  38. K3 Surfaces and Lattice Theory
    slides
    Seminar of Group Algebraic topology
    02 December, 2014
    Vietnam Institute for Advanced Study in Mathematics, Hanoi

  39. K3 Surfaces and Lattice Theory
    slides , アブストラクト原稿
    日本数学会 秋季総合分科会 企画特別講演
    28 September, 2014
    広島大学

  40. K3 Surfaces and Lattice Theory
    slides
    Colloquium talk
    05 August, 2014
    National University of Singapore

  41. The graphs of Hoffman-Singleton, Higman-Sims, McLaughlin, and the Hermitian curve of degree 6 in characteristic 5
    slides , 報告集原稿
    第31回代数的組合せ論シンポジウム
    20 June, 2014
    東北大学片平さくらホール

  42. On the supersingular K3 surface in characteristic 5 with Artin invariant 1
    slides
    函館数論幾何ワークショップ
    28 May, 2014
    北海道教育大学函館校

  43. On the supersingular K3 surface in characteristic 5 with Artin invariant 1
    K3 surfaces and their moduli
    07 May, 2014
    Schiermonnikoog, Netherlands

  44. On the automorphism groups of certain singular K3 surfaces
    Oberseminar Algebraische und Arithmetische Geometrie
    28 April, 2014
    Leibniz Universit"at Hannover

  45. The graphs of Hoffman-Singleton, Higman-Sims, McLaughlin, and the Fermat curve of degree 6 in characteristic 5
    11 April, 2014
    広島大学理学研究科数学専攻 代数学セミナー

  46. An algorithm to compute automorphism groups of K3 surfaces
    Branched Coverings, Degenerations, and Related Topics 2014
    10 March, 2014
    Hiroshima University

  47. On the supersingular K3 surface in characteristic 5 with Artin invariant 1
    Arithmetic and Algebraic Geometry 2014
    27 January, 2014
    Graduate School of Mathematical Sciences, The University of Tokyo

  48. Borcherds method and automorphism groups of K3 surfaces
    a note for RIMS koukyuuroku
    Complex Analysis and Topology of Discrete Groups and Hyperbolic Spaces
    21 January, 2014
    RIMS, Kyoto University

  49. An algorithm to compute automorphism groups of K3 surfaces
    slides
    The Asian Mathematical Conference 2013 (AMC 2013)
    02 July, 2013
    Busan, Korea

  50. An algorithm to compute automorphism groups of K3 surfaces
    26 April, 2013
    広島大学理学研究科数学専攻 代数学セミナー

  51. Supersingular K3 surfaces with Artin invariant 10 (joint work with S. Kondo)
    New Trends in arithmetic and geometry of algebraic surfaces
    12 March, 2013
    CIRM, Luminy, France

  52. Supersingular K3 surfaces with Artin invariant 10 (joint work with S. Kondo)
    Arithmetic and Algebraic Geometry 2013
    29 January, 2013
    Graduate School of Mathematical Sciences, The University of Tokyo

  53. Genus 1 fibrations on supersingular K3 surfaces of Artin invariant 10 (joint work with S. Kondo)
    02 November, 2012
    広島大学理学研究科数学専攻 代数学セミナー

  54. On rational normal curves totally tangent to a Hermitian variety
    (報告集原稿)
    射影多様体の幾何とその周辺2012
    08 October, 2012
    高知大学理学部

  55. The automorphism group of Fermat quartic surface in characteristic 3 (joint work with S. Kondo)
    (報告集原稿)
    特異点と多様体の幾何学
    27 August, 2012
    山形大学理学部

  56. The automorphism group of a supersingular K3 surface with Artin invariant 1 in characteristic 3 (joint work with Shigeyuki Kondo (Nagoya))
    07 June, 2012
    広島大学理学研究科数学専攻 代数学セミナー

  57. Rational normal curves totally tangent to a Hermitian variety
    18, May 2012
    広島大学理学研究科数学専攻 代数学セミナー

  58. 超特異K3 曲面の次数2の射影モデルについて
    代数幾何ワークショップ
    08 December, 2011
    東京大学大学院数理科学研究科

  59. Supersingular K3 surfaces in characteristic 5
    代数幾何学研究集会-ファノ多様体と正標数上の話題を中心として-
    21 February, 2011
    九州大学伊都キャンパス数理学研究教育棟

  60. 標数5における超特異K3曲面
    slides
    日本数学会中四国支部
    29 January, 2011
    鳴門地場産業振興センター

  61. Supersingular K3 surfaces and lattice theory
    Arithmetic and Algebraic Geometry 2011
    21 January, 2010
    The University of Tokyo

  62. 超特異代数多様体について
    slides
    日本数学会
    24 September, 2010
    名古屋大学

  63. 小さい標数における超特異K3曲面の構成
    玉原特殊多様体研究集会
    8 September, 2010
    玉原国際セミナーハウス

  64. 小さい標数における超特異K3曲面について
    代数幾何研究集会2010
    17 July, 2010
    法政大学小金井キャンパス

  65. Lattices of algebraic cycles in positive characteristics
    5th Pacific Rim Conference on Mathematics
    02 July, 2010
    Stanford University

  66. Lattices of algebraic cycles on varieties of Fermat type (joint work with Nobuyoshi Takahashi)
    slides
    Algebraic Geometry in Characteristic p and Related Topics
    19 February, 2010
    The University of Tokyo

  67. On lattice-invariants of complex algebraic surfaces and their applications
    slides
    Symposium in algebraic geometry
    28 December, 2009
    Busan, Korea

  68. 超特異K3曲面と格子理論
    slides
    代数学と計算
    04 December, 2009
    首都大学東京

  69. Transcendental lattices of complex algebraic surfaces
    slides
    Tohoku-Fudan joint symposium on algebraic geometry
    25 November, 2009
    Tohoku University, Sendai

  70. Transcendenlatl lattices of surfaces
    Workshop "Category Theory , Computer Science and Topology"
    18 October, 2009
    信州大学

  71. Remarks on Zariski pairs of surfaces in the projective space
    Seminar Talk
    24 September, 2009
    Fudan University, ShangHai, China

  72. Zariski pairs of normal surfaces in P^3
    The 5th Franco-Japanese Symposium on Singularities
    27 August, 2009
    IRMA, Strasbourg, France

  73. On lattice-theoretic invariants of curves on a surface
    slides
    The 2nd MSJ-SI Arrangements of Hyperplanes
    12 August, 2009
    Hokkaido University, Sapporo

  74. Links of hypersurface simple K3 singularities (joint work with A. Katanaga)
    Hodge theory and algebraic geometry
    3 July, 2009
    RIMS, Kyoto

  75. Zariski pairs and lattice theory
    slides
    Antalya Algebra Days XI
    24 May, 2009
    Antalya, Turk

  76. Zariski pairs and lattice theory
    General Seminar
    18 May, 2009
    Bilkent University, Ankara, Turk

  77. Splitting curves for the double covering branching along a plane curve of degree 6
    第4回代数・解析・幾何学セミナー
    18 February, 2009
    鹿児島大学

  78. Splitting curves for the double covering branching along a plane curve of degree 6, II and III
    特異点セミナー
    23 January, 2009
    東京理科大学

  79. On equisingular families of plane curves of degree 6
    slides
    Arithmetic and Algebraic Geometry Related to Moduli Spaces
    19 January, 2009
    The University of Tokyo

  80. Generalized Zariski-van Kampen theorem and its application to Grassmannian dual varieties
    Conference on Topology-Geometry-Algebra-Arithmetic
    22 December, 2008
    Dalat University, Dalat, Vietnam

  81. Splitting curves for the double covering branching along a plane curve of degree 6
    16 December, 2008
    Singularity Seminar, Tokyo University of Science 

  82. Generalized Zariski-van Kampen theorem
    13 November, 2008
    Algebraic Geometry in East Asia, KIAS, Seoul 

  83. Splitting curves for double sextic planes
    07 November, 2008
    Algebraic Geometry in Positive Characteristics and Related Topics, Nagoya University 

  84. Generalized Zariski-van Kampen theorem and its application to Grassmannian dual varieties
    27 August, 2008
    Colloquium at Department of Mathematics, National University of Singapore  

  85. Zariski-van Kampenの定理の一般化とグラスマン双対多様体
    June 17, 2008
    広島大学理学研究科数学専攻 トポロジー・幾何セミナー

  86. 正標数の代数多様体のチャーン数について
    April 25, 2008
    広島大学理学研究科数学専攻 代数学セミナー

  87. Dessins d'enfants and transcendental lattices of singular K3 surfaces
    slides
    酒井文雄先生還暦記念研究集会
    March 10, 2008
    埼玉大学理学部数学教室

  88. Topology and arithmetic of maximizing sextics
    slides
    SNU-HU 5th Joint Symposium on Mathematics
    January 25, 2008
    Seoul National University, Seoul, Korea

  89. 数論的 Zariski pairsについて 
    slides
    January 15, 2008
    広島大学理学研究科数学教室 談話会
  90. Singular K3 surfaces and non-homeomorphic conjugate varieties 
    slides
    Algebraic Geometry and Commutative Algebra Tokyo 2007 
    December 14, 2007
    Graduate School of Mathematical Sciences, The University of Tokyo
  91. 集中講義: 格子理論とK3曲面
    November 26-30, 2007
    東京大学大学院数理科学研究科
  92. Fundamental groups of complements of dual varieties in Grassmannian 
    slides
    高次元代数多様体とベクトル束の代数幾何学
    September 11, 2007
    九州大学理学部,博多
  93. Transcendental lattices and supersingular reduction lattices of a singular K3 surface
    slides
    COE seminar on algebraic geometry
    September 4, 2007
    Keio University, Hiyoshi, Tokyo
  94. Non-homeomorphic conjugate complex varieties
    slides
    Singularities in Geometry and Topology
    Fourth Franco-Japanese Symposium on Singularities
    August 30, 2007
    Tateyama Kokusai Hotel, Toyama
  95. Rational double points on K3 surfaces
    Niigata Workshop on Complex Geometry and Singularities
    August 24, 2007
    CrossPal Niigata, Niigata
  96. 数体上定義された特異 K3 曲面
    (報告集原稿)
    第52回代数学シンポジウム
    August 08, 2007
    Kobe University
  97. Fundamental groups of complements of dual varieties in Grassmannian
    slides
    Conference on Symplectic Geometry
    July 26, 2007
    RIMS, Kyoto
  98. Non-homeomorphic conjugate complex varieties
    slides
    6th Polish-Japanese Singularity Theory Working Days
    July 12, 2007
    Sopot, Poland
  99. 分岐曲線の補集合の基本群とリーマン面の単純ブレイド群
    第1回「 分岐被覆に関連する代数幾何とトポロジー」ワークショップ
    June 9, 2007
    東北学院大学工学部多賀城キャンパス
  100. Singular K3 surfaces and arithmetic Zariski pairs
    Seminar Talk
    March 8, 2007
    Vietnam National University, Hanoi
  101. Lectures: On Zariski -van Kampen theorem
    March 6-7, 2007
    Vietnam National University, Hanoi
  102. Transcendental lattices and supersingular reduction lattices of a singular K3 surface
    代数幾何学セミナー
    February 15, 2007
    名古屋大学
  103. On arithmetic Zariski pairs in degree 6
    特異点と基本群のワークショップ
    December 27, 2006
    東京理科大学
  104. On arithmetic Zariski pairs in degree 6
    Mini-workshop on hyperplane arrangements
    December 07, 2006
    Hokkaido University
  105. Singularities of dual varieties in characteristic 3
    slides
    International Symposium on singularity theory and its applications
    September 07, 2006
    Changsha, China
  106. Singularities of discriminant varieties in characteristic 2 and 3
    slides
    Algebraic Geometry in East Asia II
    October 13, 2005
    Hanoi, Vietnam
  107. Singularity theory in positive characteristics
    Department of Mathematics, National University of Singapore, Seminar Talk
    September 7, 2005

  108. Divisibility of certain Chern numbers
    5th Polish-Japanese Singularity Theory Working Days
    July 19, 2005
    Bukowina Tatrzanska, Poland
  109. Supersingular K3 surfaces as double covers of a projective plane
    Arithmetic and Algebraic Geometry 2004
    December 20, 2004
    The University of Tokyo
  110. Supersingular K3 surfaces in characteristic 2
    slides
    (報告集原稿)
    代数幾何と位相幾何の周辺
    2004年11月29日
    早稲田大学理工学部
  111. On topological fundamental groups of open algebraic varieties
    4th Polish-Japanese Singularity Theory Woking Days
    September 3, 2004
    Bedlewo, Poland
  112. Ternary codes and supersingular K3 surfaces in characteristic 3
    Tsuda College Mini-Workshop on Calabi-Yau Varieties, Mirror Symmetry and Related Topics
    2004年07月17日
    津田塾大学
  113. Moduli of supersingular K3 surfaces in characteristic 2
    slides
    Korea-Japan Conference on Algebraic Geometry, in honor of Professor Igor Dolgachev on his 60th birthday
    July 5, 2004
    Korea Institute for Advanced Study, Seoul, Korea
  114. 符号と超特異 K3 曲面のモジュライ
    (報告集原稿)
    第 21 回代数的組合せ論シンポジウム
    2004年06月29日
    信州大学理学部大会議室
  115. Moduli curves of supersingular K3 surfaces with Artin invariant 2 in characteristic 2
    代数幾何複素幾何金曜セミナー
    2004年05月21日
    大阪大学理学部数学教室
  116. 集中講義:代数多様体の基本群
    2004年01月13日-15日
    お茶の水大学
  117. Supersingular K3 surfaces
    Conference on Algebra-Geometry-Topology
    25 November, 2003
    Dalat University, Dalat, Vietnam

  118. Supersingular K3 surfaces in characteristic 2 as purely inseparable double covers of projective planes
    談話会
    2003年11月04日
    北海道教育大学函館校

  119. Supersingular K3 surfaces as double planes
    代数幾何学セミナー
    2003年10月27日
    名古屋大学多元数理研究科

  120. Supersingular K3 surfaces
    Mathematics of Nonlinear Structure
    Joint Symposium between Seoul National University and Hokkaido University
    October 18, 2003
    Seoul National University, Seoul, Korea

  121. Supersingular K3 surfaces
    3rd Japanese-Polish Singularity Theory Working Days
    September 28, 2003
    Hokkaido University

  122. Supersingular K3 surfaces as double covers of the projective plane
    (報告集原稿)
    代数曲線束の局所不変量の研究
    2003年6月18日
    京都大学数理解析研究所

  123. Variations on Zariski-van Kampen Theorem
    火曜トポロジーセミナー
    2003年6月17日
    東京大学大学院数理科学研究科

  124. 開代数多様体の基本群
    ENCOUNTER with MATHEMATICS 第27回 分岐被覆と基本群 --代数幾何とトポロジーの接点 --
    2003年4月12日
    中央大学理工学部

  125. Supersingular K3 surfaces as double covers of the projective plane
    Department of Mathematics, National University of Singapore, Seminar Talk
    March 26, 2003

  126. Rational double points on supersingular K3 surfaces
    神戸大学CAセミナー
    2002年11月19日

  127. 集中講義:代数多様体の基本群
    2002年11月18日-22日
    神戸大学
  128. Rational double points on supersingular K3 surfaces
    (報告集原稿)
    代数幾何学シンポジウム
    2002年10月23日
    兵庫県立城崎大会議館

  129. Rational double points on K3 surfaces
    Singularites franco-japonaises
    September 12, 2002
    CIRM, Luminy, France

  130. Elliptic K3 surfaces
    長沙電力学院, 湖南省, 中国
    June 6, 2002

  131. Variations of Zariski-van Kampen Theorem
    The fundamental group of algebraic varieties, Hokkaido University
    July 25, 2002

  132. 1. The fundamental groups of algebraic fiber spaces
    2. Vanishing cycles and the generalized Hodge conjecture
    Korea Institute for Advanced Study, Mathematics Seminars
    October 24, 2001

  133. Vanishing cycles and the generalized Hodge conjecture
    Polish-Japanese Singularity Theory Working Days September 20-27 , 2001
    The Mathematical Conference Center, Bedlewo, Poland

  134. Equisingular families of plane curves with many connected components
    Algebraic Geometry in East Asia August 9, 2001
    International Institute for Advanced Studies (Kyoto)

  135. The fundamental groups of algebraic fiber spaces
    Singularities and Related Subjects, Second Workshop In Changchun, July 8-10, 2001
    Northeast Normal University, Changchun, China

  136. Vanishing cycles and the generalized Hodge conjecture
    International Symposium on Singularity Theory and Its Applications, July 4-6, 2001
    Beijing University of Chemical Technology, Beijing, China

  137. Lectures on Zariski-van Kampen Theorem
    08-21 May, 2001
    Dalat University, Vietnam
  138. Lattices of algebraic cycles on Fermat varieties in positive characteristics
    Arithemetic and Algebraic Geometry, January 15-18, 2001
    Graduate School of Mathematical Sciences, The University of Tokyo

  139. 非可換基本群をもつZariski pairについて
    Branched Galois covers and related topics, 2000年12月11日-13日
    高知大学

  140. Fermat格子について
    名古屋大学多元数理研究科談話会
    2000年12月6日

  141. 集中講義:消失サイクルの幾何学と一般Hodge予想
    2000年12月4日-7日
    名古屋大学
  142. On elliptic K3 surfaces
    The mini workshop on explicit moduli in Sapporo, August 01-04, 2000
    Hokkaido University

  143. Lattices of algebraic cycles on Fermat varieties in positive characteristics
    (日本語原稿)
    有限群論と代数的組合せ論,   2000年1月17日
    京都大学 数理解析研究所

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