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List of talks given in English (2000-)

  1. Monodromy of families of del Pezzo surfaces
    Topological Methods and Invariants of Curves and Surfaces
    July 21, 2026
    Bayreuth University
  2. Involutions in the affine Conway group
    Oberseminar Algebraische Geometrie
    July 15, 2026
    Saarland University
  3. Del Pezzo surfaces of degree one and examples of Zariski multiples
    slides
    Singularities and Algebraic Geometry
    January 26, 2026
    University of Phan Thiet
  4. Borcherds methods for the automorphism groups of K3 surfaces
    Japanese-European Symposium on Symplectic Varieties and Moduli Spaces (the 9th edition)
    September 02 and 04, 2025
    Groesbeek, the Netherlands
  5. The automorphism group of an Apéry--Fermi K3 surface
    Calabi-Yau Varieties and Related Topics 2025
    July 05, 2025
    Tsuda University
  6. Conway Theory and K3 Surfaces
    slides
    Algebraic Geometry and Related Topics
    Mar 14, 2025
    Visiting Experts and Project Office, Hanoi University of Science
  7. The automorphism group of an Apéry–Fermi K3 surface
    slides
    Seminars: Topology & Geometry
    Sep 09, 2024
    National University of Singapore
  8. Real line arrangements and vanishing cycles
    slides
    ODTU-Bilkent Algebraic Geometry Seminars
    April 19, 2024
    Zoom
  9. Topology of a double plane branching along a real line arrangement
    Seminar talk at Dalat University
    December 8, 2023
    Dalat, Vietnam
  10. 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
  11. Conway theory for algebraic geometers
    Working Workshop on Calabi--Yau Varieties and Related Topics 2023
    July 22, 2023
    Hokkaido University
  12. The automorphism group of a K3 surface birational to a double plane
    Real Aspects of Geometry
    November 4, 2022
    CIRM, Luminy, France
  13. Mordell-Weil groups of a certain K3 surface
    slides
    Recent Development in Algebraic Geometry
    August 30, 2022
    National University of Singapore
  14. Lectures: Computational tools in the study of K3 surfaces
    July 11--15, 2022
    Graduate School of Mathematics, Nagoya University
    Lecture Notes
  15. 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
  16. Computation of automorphism groups of Enriques surfaces (joint work with Simon Brandhorst)
    slides
    ODTU-Bilkent Algebraic Geometry Seminar
    December 17, 2021
    Zoom
  17. 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
  18. Computation of automorphism groups of K3 and Enriques surfaces
    slides
    proceedings
    Algebra symposium
    September 04, 2019
    Tohoku University
  19. The automorphism groups of Enriques surfaces covered by a Jacobian Kummer surface
    Seminar talk
    May 15, 2019
    Saarland University
  20. The automorphism groups of Enriques surfaces covered by a Jacobian Kummer surface
    Seminar talk
    May 14, 2019
    Johannes Gutenberg University Mainz
  21. The automorphism groups of Enriques surfaces
    Seminar talk
    February 21, 2019
    Vietnam National University of Science, Hanoi, Vietnam
  22. 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
  23. 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
  24. 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
  25. An Enriques involution of the Fermat quartic surface in characteristic 3
    K3 surfaces and Realted Topics
    December 21, 2017
    Nagoya University
  26. Lectures: On Zariski-van Kampen theorem
    November 29- December 2, 2017
    Tribhuvan University, Kirtipur, Nepal
  27. Rational double points on complex Enriques surfaces
    Geometry and Representation Theory Seminar
    25 September, 2017
    Queen's University, Kingston, Canada
  28. Rational double points on complex Enriques surfaces
    Workshop on Calabi-Yau manifolds: Arithmetics, Geometry and Physics
    08 August, 2017
    Gakushuin University
  29. Automorphisms of K3 surfaces and Enriques surfaces
    slides
    Hakodate workshop on arithmetic geometry 2017
    29 May, 2017
    Hakodate
  30. On an Enriques surface associated with a quartic Hessian surface
    Oberseminar Algebraische und Arithmetische Geometrie
    04 May, 2017
    Leibniz Universit"at Hannover
  31. On an Enriques surface associated with a quartic Hessian surface
    "Algebraic Geometry Conference"
    29 Mar, 2017
    Haeundae, Busan
  32. On an Enriques surface associated with a quartic Hessian surface
    "Topology of Singularities"
    21 Feb, 2017
    Vietnam Institute for Advanced Study in Mathematics, Hanoi
  33. Connected components of the moduli of elliptic K3 surfaces
    "The 10th Arithmetic and Algebraic Geometry"
    14 Dec, 2016
    The University of Tokyo
  34. Connected components of the moduli of elliptic K3 surfaces
    slides
    "The 4th Franco-Japanese-Vietnamese Singularities"
    09 Nov, 2016
    University Savoie Mont Blanc, Chambery
  35. A smooth quartic surface containing 56 lines
    slides
    "Algebra, geometry and topology of singularities"
    13 May, 2016
    Galatasaray University, Istanbul
  36. Computer-aided calculations in the study of K3 surfaces
    slides
    Colloquium talk
    17 March, 2016
    Vietnam National University, Hanoi
  37. Automorphisms of supersingular K3 surfaces and Salem polynomials
    "Conference on K3 surfaces and related topics"
    16 November, 2015
    KIAS, Seoul
  38. 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
  39. 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
  40. 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
  41. 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
  42. K3 Surfaces and Lattice Theory
    slides
    Seminar of Group Algebraic topology
    02 December, 2014
    Vietnam Institute for Advanced Study in Mathematics, Hanoi
  43. K3 Surfaces and Lattice Theory
    slides
    Colloquium talk
    05 August, 2014
    National University of Singapore
  44. On the supersingular K3 surface in characteristic 5 with Artin invariant 1
    K3 surfaces and their moduli
    07 May, 2014
    Schiermonnikoog, Netherlands
  45. On the automorphism groups of certain singular K3 surfaces
    Oberseminar Algebraische und Arithmetische Geometrie
    28 April, 2014
    Leibniz Universit"at Hannover
  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. 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
  51. 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
  52. Supersingular K3 surfaces and lattice theory
    Arithmetic and Algebraic Geometry 2011
    21 January, 2011
    University of Tokyo
  53. Lattices of algebraic cycles in positive characteristics
    5th Pacific Rim Conference on Mathematics
    02 July, 2010
    Stanford University
  54. 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
  55. On lattice-invariants of complex algebraic surfaces and their applications slides
    Symposium in algebraic geometry
    28 December, 2009
    Busan, Korea
  56. Transcendental lattices of complex algebraic surfaces slides
    Tohoku-Fudan joint symposium on algebraic geometry
    25 November, 2009
    Tohoku University, Sendai
  57. Remarks on Zariski pairs of surfaces in the projective space
    Seminar Talk
    24 September, 2009
    Fudan University, ShangHai, China
  58. Zariski pairs of normal surfaces in P^3
    The 5th Franco-Japanese Symposium on Singularities
    27 August, 2009
    IRMA, Strasbourg, France
  59. On lattice-theoretic invariants of curves on a surface slides
    The 2nd MSJ-SI Arrangements of Hyperplanes
    12 August, 2009
    Hokkaido University, Sapporo
  60. Links of hypersurface simple K3 singularities (joint work with A. Katanaga)
    Hodge theory and algebraic geometry
    3 July, 2009
    RIMS, Kyoto
  61. Zariski pairs and lattice theory slides
    Antalya Algebra Days XI
    24 May, 2009
    Antalya, Turk
  62. Zariski pairs and lattice theory
    General Seminar
    18 May, 2009
    Bilkent University, Ankara, Turk
  63. 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
  64. On equisingular families of plane curves of degree 6 slides
    Arithmetic and Algebraic Geometry Related to Moduli Spaces
    19 January, 2009
    University of Tokyo
  65. 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
  66. Splitting curves for the double covering branching along a plane curve of degree 6
    16 December, 2008
    Singularity Seminar, Tokyo University of Science
  67. Generalized Zariski-van Kampen theorem
    13 November, 2008
    Algebraic Geometry in East Asia, KIAS, Seoul
  68. Splitting curves for double sextic planes
    07 November, 2008
    Algebraic Geometry in Positive Characteristics and Related Topics, Nagoya University
  69. Generalized Zariski-van Kampen theorem and its application to Grassmannian dual varieties
    27 August, 2008
    Colloquium at Department of Mathematics, National University of Singapore
  70. Topology and arithmetic of maximizing sextics
    SNU-HU 5th Joint Symposium on Mathematics
    January 25, 2008
    Seoul National University, Seoul, Korea
  71. 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
  72. Transcendental lattices and supersingular reduction lattices of a singular K3 surface
    COE seminar on algebraic geometry
    September 4, 2007
    Keio University, Hiyoshi, Tokyo
  73. Non-homeomorphic conjugate complex varieties
    Singularities in Geometry and Topology
    Fourth Franco-Japanese Symposium on Singularities
    August 30, 2007
    Tateyama Kokusai Hotel, Toyama
  74. Rational double points on K3 surfaces
    Niigata Workshop on Complex Geometry and Singularities
    August 24, 2007
    CrossPal Niigata, Niigata
  75. Fundamental groups of complements of dual varieties in Grassmannian
    Conference on Symplectic Geometry
    July 26, 2007
    RIMS, Kyoto
  76. Non-homeomorphic conjugate complex varieties
    6th Polish-Japanese Singularity Theory Working Days
    July 12, 2007
    Sopot, Poland
  77. Singular K3 surfaces and arithmetic Zariski pairs
    Seminar Talk
    March 8, 2007
    Vietnam National University, Hanoi
  78. Lectures: On Zariski-van Kampen theorem
    March 6-7, 2007
    Vietnam National University, Hanoi
  79. On arithmetic Zariski pairs in degree 6
    Mini-workshop on hyperplane arrangements
    December 07, 2006
    Hokkaido University
  80. Singularities of dual varieties in characteristic 3
    International Symposium on singularity theory and its applications
    September 07, 2006
    Changsha, China
  81. Singularities of discriminant varieties in characteristic 2 and 3
    Algebraic Geometry in East Asia II
    October 13, 2005
    Hanoi, Vietnam
  82. Singularity theory in positive characteristics
    Department of Mathematics, National University of Singapore, Seminar Talk
    September 7, 2005
  83. Divisibility of certain Chern numbers
    5th Polish-Japanese Singularity Theory Working Days
    July 19, 2005
    Bukowina Tatrzanska, Poland
  84. Supersingular K3 surfaces as double covers of a projective plane
    Arithmetic and Algebraic Geometry 2004
    December 20, 2004
    University of Tokyo
  85. On topological fundamental groups of open algebraic varieties
    4th Polish-Japanese Singularity Theory Woking Days
    September 3, 2004
    Bedlewo, Poland
  86. 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
  87. Supersingular K3 surfaces
    Conference on Algebra-Geometry-Topology
    25 November, 2003
    Dalat University, Dalat, Vietnam
  88. Supersingular K3 surfaces
    Mathematics of Nonlinear Structure
    Joint Symposium between Seoul National University and Hokkaido University
    October 18, 2003
    Seoul National University, Seoul, Korea
  89. Supersingular K3 surfaces
    3rd Japanese-Polish Singularity Theory Working Days
    September 28, 2003
    Hokkaido University
  90. Supersingular K3 surfaces as double covers of the projective plane
    Department of Mathematics, National University of Singapore, Seminar Talk
    March 26, 2003
  91. Rational double points on K3 surfaces
    Singularites franco-japonaises
    September 12, 2002
    CIRM, Luminy, France
  92. Elliptic K3 surfaces
    Changsha, China
    June 6, 2002
  93. Variations of Zariski-van Kampen Theorem
    The fundamental group of algebraic varieties, Hokkaido University
    July 25, 2002
  94. 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
  95. Vanishing cycles and the generalized Hodge conjecture
    Polish-Japanese Singularity Theory Working Days September 20-27 , 2001
    The Mathematical Conference Center, Bedlewo, Poland
  96. Equisingular families of plane curves with many connected components
    Algebraic Geometry in East Asia August 9, 2001
    International Institute for Advanced Studies (Kyoto)
  97. The fundamental groups of algebraic fiber spaces
    Singularities and Related Subjects, Second Workshop In Changchun, July 8-10, 2001
    Northeast Normal University, Changchun, China
  98. 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
  99. Lectures on Zariski-van Kampen Theorem
    08-21 May, 2001
    Dalat University, Vietnam
  100. 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
  101. On elliptic K3 surfaces
    The mini workshop on explicit moduli in Sapporo, August 01-04, 2000
    Hokkaido University

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