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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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