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List of talks given in English (2000-)


  1. The automorphism groups of Enriques surfaces
    Seminar talk
    February 21, 2019
    Vietnam National University of Science, Hanoi, Vietnam
  2. 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
  3. 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
  4. 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
  5. An Enriques involution of the Fermat quartic surface in characteristic 3
    K3 surfaces and Realted Topics
    December 21, 2017
    Nagoya University
  6. Lectures: On Zariski-van Kampen theorem
    November 29- December 2, 2017
    Tribhuvan University, Kirtipur, Nepal
  7. Rational double points on complex Enriques surfaces
    Geometry and Representation Theory Seminar
    25 September, 2017
    Queen's University, Kingston, Canada
  8. Rational double points on complex Enriques surfaces
    Workshop on Calabi-Yau manifolds: Arithmetics, Geometry and Physics
    08 August, 2017
    Gakushuin University
  9. Automorphisms of K3 surfaces and Enriques surfaces
    slides
    Hakodate workshop on arithmetic geometry 2017
    29 May, 2017
    Hakodate
  10. On an Enriques surface associated with a quartic Hessian surface
    Oberseminar Algebraische und Arithmetische Geometrie
    04 May, 2017
    Leibniz Universit"at Hannover
  11. On an Enriques surface associated with a quartic Hessian surface
    "Algebraic Geometry Conference"
    29 Mar, 2017
    Haeundae, Busan

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

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

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

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

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

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

  18. 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

  19. 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

  20. 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

  21. 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

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

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

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

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

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

  27. 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

  28. 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

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

  30. 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

  31. 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

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

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

  34. 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
    University of Tokyo

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

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

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

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

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

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

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

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

  43. Splitting curves for the double covering branching along a plane curve of degree 6
    The 4-th Algebra-Geometry-Analysis seminar
    18 February, 2009
    Kagoshima University

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

  45. 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

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

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

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

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

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

  51. Singular K3 surfaces and non-homeomorphic conjugate varieties
    Algebraic Geometry and Commutative Algebra Tokyo 2007
    December 14, 2007
    Graduate School of Mathematical Sciences, The University of Tokyo
  52. Transcendental lattices and supersingular reduction lattices of a singular K3 surface
    COE seminar on algebraic geometry
    September 4, 2007
    Keio University, Hiyoshi, Tokyo
  53. Non-homeomorphic conjugate complex varieties
    Singularities in Geometry and Topology
    Fourth Franco-Japanese Symposium on Singularities
    August 30, 2007
    Tateyama Kokusai Hotel, Toyama
  54. Rational double points on K3 surfaces
    Niigata Workshop on Complex Geometry and Singularities
    August 24, 2007
    CrossPal Niigata, Niigata
  55. Fundamental groups of complements of dual varieties in Grassmannian
    Conference on Symplectic Geometry
    July 26, 2007
    RIMS, Kyoto
  56. Non-homeomorphic conjugate complex varieties
    6th Polish-Japanese Singularity Theory Working Days
    July 12, 2007
    Sopot, Poland
  57. Singular K3 surfaces and arithmetic Zariski pairs
    Seminar Talk
    March 8, 2007
    Vietnam National University, Hanoi
  58. Lectures: On Zariski-van Kampen theorem
    March 6-7, 2007
    Vietnam National University, Hanoi
  59. On arithmetic Zariski pairs in degree 6
    Mini-workshop on hyperplane arrangements
    December 07, 2006
    Hokkaido University
  60. Singularities of dual varieties in characteristic 3
    International Symposium on singularity theory and its applications
    September 07, 2006
    Changsha, China
  61. Singularities of discriminant varieties in characteristic 2 and 3
    Algebraic Geometry in East Asia II
    October 13, 2005
    Hanoi, Vietnam
  62. Singularity theory in positive characteristics
    Department of Mathematics, National University of Singapore, Seminar Talk
    September 7, 2005

  63. Divisibility of certain Chern numbers
    5th Polish-Japanese Singularity Theory Working Days
    July 19, 2005
    Bukowina Tatrzanska, Poland
  64. Supersingular K3 surfaces as double covers of a projective plane
    Arithmetic and Algebraic Geometry 2004
    December 20, 2004
    University of Tokyo
  65. On topological fundamental groups of open algebraic varieties
    4th Polish-Japanese Singularity Theory Woking Days
    September 3, 2004
    Bedlewo, Poland
  66. Moduli of supersingular K3 surfaces in characteristic 2
    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
  67. Supersingular K3 surfaces
    Conference on Algebra-Geometry-Topology
    25 November, 2003
    Dalat University, Dalat, Vietnam

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

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

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

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

  72. Elliptic K3 surfaces
    Changsha, China
    June 6, 2002

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

  74. 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

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

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

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

  78. 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

  79. Lectures on Zariski-van Kampen Theorem
    08-21 May, 2001
    Dalat University, Vietnam
  80. 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

  81. On elliptic K3 surfaces
    The mini workshop on explicit moduli in Sapporo, August 01-04, 2000
    Hokkaido University

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