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List of talks given in English (2000)

The automorphism groups of Enriques surfaces
Seminar talk
February 21, 2019
Vietnam National University of Science, Hanoi, Vietnam

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

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

The elliptic modular surface of level 4 and its reduction modulo 3
Working Workshop on
CalabiYau Varieties and Related Topics
August 10, 2018
Gakushuin University

An Enriques involution of the Fermat quartic surface in characteristic 3
K3 surfaces and Realted Topics
December 21, 2017
Nagoya University

Lectures: On Zariskivan Kampen theorem
November 29 December 2, 2017
Tribhuvan University, Kirtipur, Nepal

Rational double points on complex Enriques surfaces
Geometry and Representation Theory Seminar
25 September, 2017
Queen's University, Kingston, Canada

Rational double points on complex Enriques surfaces
Workshop on CalabiYau manifolds: Arithmetics, Geometry and Physics
08 August, 2017
Gakushuin University

Automorphisms of K3 surfaces and Enriques surfaces
slides
Hakodate workshop on arithmetic geometry 2017
29 May, 2017
Hakodate

On an Enriques surface associated with a quartic Hessian surface
Oberseminar Algebraische und Arithmetische Geometrie
04 May, 2017
Leibniz Universit"at Hannover

On an Enriques surface associated with a quartic Hessian surface
"Algebraic Geometry Conference"
29 Mar, 2017
Haeundae, Busan

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

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

Connected components of the moduli of elliptic K3 surfaces
slides
"The 4th FrancoJapaneseVietnamese Singularities"
09 Nov, 2016
University Savoie Mont Blanc, Chambery

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

Computeraided calculations in the study of K3 surfaces
slides
Colloquium talk
17 March, 2016
Vietnam National University, Hanoi

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

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

Automorphisms of supersingular K3 surfaces and Salem polynomials
Tsuda College MiniWorkshop "CalabiYau Varieties: Arithmetic, Geometry and Physics"
07 August, 2015
Tsuda College, Tokyo

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

On latticeinvariants of complex algebraic surfaces and their applications
slides
Symposium in algebraic geometry
28 December, 2009
Busan, Korea

Transcendental lattices of complex algebraic surfaces
slides
TohokuFudan joint symposium on algebraic geometry
25 November, 2009
Tohoku University, Sendai

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

Zariski pairs of normal surfaces in P^3
The 5th FrancoJapanese Symposium on Singularities
27 August, 2009
IRMA, Strasbourg, France

On latticetheoretic invariants of curves on a surface
slides
The 2nd MSJSI Arrangements of Hyperplanes
12 August, 2009
Hokkaido University, Sapporo

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

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

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

Splitting curves for the double covering branching along
a plane curve of degree 6
The 4th AlgebraGeometryAnalysis seminar
18 February, 2009
Kagoshima University

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

Generalized Zariskivan Kampen theorem and its application to Grassmannian dual varieties
Conference on TopologyGeometryAlgebraArithmetic
22 December, 2008
Dalat University, Dalat, Vietnam

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

Generalized Zariskivan Kampen theorem
13 November, 2008
Algebraic Geometry in East Asia,
KIAS, Seoul

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

Generalized Zariskivan Kampen theorem and its application
to Grassmannian dual varieties
27 August, 2008
Colloquium at Department of Mathematics,
National University of Singapore

Topology and arithmetic of maximizing sextics
SNUHU 5th Joint Symposium on Mathematics
January 25, 2008
Seoul National University, Seoul, Korea

Singular K3 surfaces and nonhomeomorphic conjugate varieties
Algebraic Geometry and Commutative Algebra Tokyo 2007
December 14, 2007
Graduate School of Mathematical Sciences, The University of Tokyo

Transcendental lattices and supersingular reduction lattices of a singular K3 surface
COE seminar on algebraic geometry
September 4, 2007
Keio University, Hiyoshi, Tokyo

Nonhomeomorphic conjugate complex varieties
Singularities in Geometry and Topology
Fourth FrancoJapanese Symposium on Singularities
August 30, 2007
Tateyama Kokusai Hotel, Toyama

Rational double points on K3 surfaces
Niigata Workshop on Complex Geometry and Singularities
August 24, 2007
CrossPal Niigata, Niigata

Fundamental groups of complements of dual varieties in Grassmannian
Conference on Symplectic Geometry
July 26, 2007
RIMS, Kyoto

Nonhomeomorphic conjugate complex varieties
6th PolishJapanese Singularity Theory Working Days
July 12, 2007
Sopot, Poland

Singular K3 surfaces and arithmetic Zariski pairs
Seminar Talk
March 8, 2007
Vietnam National University, Hanoi

Lectures: On Zariskivan Kampen theorem
March 67, 2007
Vietnam National University, Hanoi

On arithmetic Zariski pairs in degree 6
Miniworkshop on hyperplane arrangements
December 07, 2006
Hokkaido University

Singularities of dual varieties in characteristic 3
International Symposium on singularity theory and its applications
September 07, 2006
Changsha, China

Singularities of discriminant varieties in characteristic 2 and 3
Algebraic Geometry in East Asia II
October 13, 2005
Hanoi, Vietnam

Singularity theory in positive characteristics
Department of Mathematics, National University of Singapore, Seminar Talk
September 7, 2005

Divisibility of certain Chern numbers
5th PolishJapanese Singularity Theory Working Days
July 19, 2005
Bukowina Tatrzanska, Poland

Supersingular K3 surfaces as double covers of a projective plane
Arithmetic and Algebraic Geometry 2004
December 20, 2004
University of Tokyo

On topological fundamental groups of open algebraic varieties
4th PolishJapanese Singularity Theory Woking Days
September 3, 2004
Bedlewo, Poland

Moduli of supersingular K3 surfaces in characteristic 2
KoreaJapan Conference on Algebraic Geometry,
in honor of Professor Igor Dolgachev on his 60th birthday
July 5, 2004
Korea Institute for Advanced Study,
Seoul, Korea

Supersingular K3 surfaces
Conference on AlgebraGeometryTopology
25 November, 2003
Dalat University, Dalat, Vietnam

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

Supersingular K3 surfaces
3rd JapanesePolish Singularity Theory Working Days
September 28, 2003
Hokkaido University

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

Rational double points on K3 surfaces
Singularites francojaponaises
September 12, 2002
CIRM, Luminy, France

Elliptic K3 surfaces
Changsha, China
June 6, 2002

Variations of Zariskivan Kampen Theorem
The fundamental group of algebraic varieties, Hokkaido University
July 25, 2002

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

Vanishing cycles and the generalized Hodge conjecture
PolishJapanese Singularity Theory Working Days
September 2027 , 2001
The Mathematical Conference Center, Bedlewo, Poland

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

The fundamental groups of algebraic fiber spaces
Singularities and Related Subjects, Second Workshop In Changchun,
July 810, 2001
Northeast Normal University, Changchun, China

Vanishing cycles and the generalized Hodge conjecture
International Symposium on Singularity Theory and Its Applications,
July 46, 2001
Beijing University of Chemical Technology, Beijing, China

Lectures on Zariskivan Kampen Theorem
0821 May, 2001
Dalat University,
Vietnam

Lattices of algebraic cycles on Fermat varieties
in positive characteristics
Arithemetic and Algebraic Geometry,
January 1518, 2001
Graduate School of Mathematical Sciences, The University of Tokyo

On elliptic K3 surfaces
The mini workshop on explicit moduli in Sapporo,
August 0104, 2000
Hokkaido University
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