2025
Motivic Gauss and Jacobi sums. March 5. Algebraic Geometry Seminar National Cheng Kung University, Taiwan.
2024
Torsion birational motives of surfaces and unramified cohomology. August 21. KAIST seminar(Korea).
2023
Torsion birational motives of surfaces and unramified cohomology. November 24. Seminar on Arithmetic Geometry and Algebraic Groups (online).
Torsion birational motives of surfaces and unramified cohomology. November 22. Number theory seminar. Tokyo University.
Torsion birational motives of surfaces and unramified cohomology. October 30. Niigata algebra seminar (hybrid).
Torsion birational motives of surfaces and unramified cohomology. August 21. Japan-Taiwan Joint Conference on Number Theory 2023, National Penghu University of Science and Technology, Taiwan.
Torsion birational motives of surfaces and unramified cohomology. June 2. Waseda number theory seminar (hybrid).
2022
Unramified cohomology and P^1-invariance. October 26. Motives, quadratic forms and arithmetic, Lens, France.
Unramified cohomology and P^1-invariance. June 20. Colloquium, Tohoku university (hybrid).
2021
Abelian covering of modular curves and non-congruence subgroups. August 21. Number theory summer school (online).
2019
Lax tensor products for reciprocity sheaves. November 11. p-adic cohomology and arithmetic geometry 2019, Tohoku University.
Arithmetic of generalized Jacobians of modular curves, I and II. July 8 and 9. HKU Number Theory Days 2019, The University of Hong Kong.
Arithmetic of generalized Jacobians of modular curves. June 17. Eisenstein ideal and Iwasawa theory, Morningside Center of Mathematics, Beijing, China.
Mixed Hodge structures with modulus and 1-motives. March 14. TIFR mathematics colloquium, India.
Arithmetic of generalized Jacobians of modular curves. January 22. Asia-Australia Algebra Conference. Western Sydney University, Australia.
2018
Motives and mixed Hodge structures with modulus. September 26. Mathematical Society of Japan meeting, algebra session, special lecture. Okayama University.
Generalized Jacobians of modular and Drinfeld modular curves. September 7. Japan-Taiwan Joint conference on Number theory 2018, Nagasaki.
Mixed Hodge structures with modulus and 1-motives. August 24. Hodge theory and algebraic geometry, Tokyo Denki University.
Mixed Hodge structures with modulus. June 28. Pan Asia Number Theory Conference. IMS, National University of Singapore.
Mixed Hodge structures with modulus. March 29. Motives in Tokyo. University of Tokyo.
Mixed Hodge structures with modulus. March 23. Seminario, L'Università degli Studi di Milano.
Mixed Hodge structures with modulus. March 15. Les Séminaires Géométrie et Systèmes Dynamiques. L'Institut de Mathématiques de Bourgogne .
2017
Generalized Jacobians of modular and Drinfeld modular curves. December 27. Hokuriku number theory conference. Toyama University.
Toward Hodge theory with modulus. November 17. TIMS Seminar in Algebraic Geometry, National Taiwan University, Taipei.
Nori motives of curves with modulus and Laumon 1-motives. September 7. Regulators in Niseko 2017.
Nori motives of curves with modulus and Laumon 1-motives. March 9. Academia Sinica colloquium, Taipei.
2016
Nori motives of curves with modulus and Laumon 1-motives. September 20. Differential forms in algebraic geometry, the University of Freiburg.
Nori motives of curves with modulus and Laumon 1-motives. September 10. Japan-Taiwan Joint conference on Number theory 2016, National Center for Theoretical Sciences, Taipei.
Motives with modulus. June 29. Algebraic K-theory and Motivic Cohomology, Mathematisches Forschungsinstitut Oberwolfach.
Rational torsion on the generalized Jacobian of a modular curve with cuspidal modulus. May 30. Hakodate workshop on arithmetic geometry 2016.
Motives with modulus, II. (Part I is delivered by Bruno Kahn.) April 5. Generalizations of A^1-Homotopy Invariance in Algebraic Geometry and Homotopy Theory, Zinnowitz/Usedom.
Motives with modulus. Feburary 23. National Center for Theoretical Sciences, Taiwan.
Motives with modulus. Feburary 15. Motives in Tokyo, 2016, Tokyo University.
2015
Motives with modulus. November 19. Algebraic geometry seminar, Rennes university.
Non-homotopy invariant motive theory. June 2. Workshop on arithmetic geometry at Tambara 2015, Numata.
2014
p-adic soliton theory and arithmetic geometry. October 10. Novel visage of arithmetic and derived geometry, Chuo University.
p-adic soliton theory and arithmetic geometry. July 7. Mini-workshop, Tohoku University.
Reciprocity sheaves. July 4. Seminar on Number Theory and Automorphic forms. Osaka University.
Reciprocity sheaves. May 27. Workshop on arithmetic geometry in Hakodate, Hokkaido.
Voevodsky's motif and Weil reciprocity. March 12. 2014 NCTS Mini-Workshop on Number Theory, NCTS, Taiwan.
p-adic soliton theory and arithmetic geometry. January 30. Arithmetic and Algebraic Geoemtry 2014, Tokyo University.
p-adic soliton theory and torsion points on Jacobian varieties. January 24. East Asia Number Theory Conference 2014, Fukuoka.
Towards non-homotopy invariant motive theory. January 8. Colloquium, Kyoto University.
2013
p-adic soliton theory and torsion points on Jacobian varieties. December 11, Algebraic Number Theory and Related Topics, Research Institute for Mathematical Sciences, Kyoto University.
Reciprocity sheaves: towards non-homotopy invariant motive theory. November 27. Motives in Tokyo, 2013, Tokyo University.
Reciprocity sheaves: towards non-homotopy invariant motive theory. October 31. Arithmetic, differential and geometry, Tohoku University.
Torsion points on Jacobian varieties via Anderson's p-adic soliton theory. September 19. Seminaire Groupes, Algebre et Geometrie, Poitiers University, France.
Reciprocity sheaves. July 31. Workshop on reciprocity sheaves, Nagano.
p-adic soliton theory and arithmetic geometry. May 30. Colloquium, Hokkaido University.
2012
Algebraic cycles on a product of curves over a p-adic field. November 21. Seminaire autour des cycles algebriques, Institut de Mathematiques de Jussieu, Paris.
Torsion points on Jacobian varieties via Anderson's p-adic soliton theory. November 19. Seminaire de theorie des nombres, Institut de Mathematiques de Jussieu, Paris.
Voevodsky's category of motives and Milnor K-groups attached to semi-abelian varieties. September 13. Number Theory Day in Keio, Keio University.
Torsion points on Jacobian varieties via Anderson's p-adic soliton theory. May 17. Tohoku-Fudan Workshop, Tohoku University.
Somekawa's K-groups and Voevodsky's Hom groups. April, 19-20. Arithmetic geometry seminar, Hokkaido University.
On Theta divisor, Jacobian, KdV and KP equations. March 14. TIMS Seminar on Arithmetic Geometry, National Taiwan University.
Torsion points on the quotient of a Fermat Jacobian via Anderson's p-adic soliton theory, I. March 7. Mini-workshop on number theory, National Tsing Hua University, Taiwan.
p-adic Sato theory and arithmetic geometry. February 18. Kagawa Seminar.
2011
p-adic Sato theory and arithmetic geometry. December 16. Algebra Seminar, Hiroshima University.
Voevodsky's motif and Weil reciprocity. December 12. International Workshop on motives in Tokyo, 2011.
Voevodsky's motif and Weil reciprocity. November 29. Algebraic Number Theory and Related Topics, Research Institute for Mathematical Sciences, Kyoto University.
Torsion on theta divisors of hyperelliptic Jacobians and p-adic tau functions. November 14. Algebra seminar, Keio University.
Torsion on theta divisors of hyperelliptic Jacobians and p-adic tau functions. September 22. Géométrie arithmétique et motivique, Luminy, France.
Class field theory for open varieties over local fields. June 14. Colloquium, Chiba University.
Class field theory for open varieties over local fields. April 19. National Center for Theoretical Sciences, Taiwan.
2010
Class field theory for open varieties over local fields. December 16. International workshop on motives in Tokyo, part 6. University of Tokyo.
Krichever correpondence / p-adic tau function and its application to arithmetic geometry. September 30. Workshop on p-adic Sato theory and arithmetic geometry, Tohoku University.
Brauer groups and 0-cycles on open varieties over a local field. September 24. Mathematical Society of Japan meeting, algebra session, special lecture. Nagoya University.
Brauer-Manin pairing for open varieties over local fields. July 6. Academia Sinica, Taiwan.
Brauer groups and 0-cycles on varieties over a local field (survey). May 20. Algebra seminar, Tohoku University.
Sato theory, p-adic tau function and arithmetic geometry. March 19. Kyushu Algebraic Number Theory 2010, Kyushu University.
Zero-cycles on a variety over a (two dimensional) local field February 17. Workshop on period integral and motif, University of Tokyo.
Higher dimensional class field theory for a product of curves. January 20. Japan-Korea Number Theory 2010 at Seoul, Korea.
2009
Higher dimensional class field theory for a product of curves. December 1. Fudan University, China.
Application of p-adic tau functions to the Manin-Mumford conjecture (after Anderson). October 30. P-adic Special Functions and Arithmetic Geometry, Zao.
Higher dimensional class field theory for a product of curves. October 13. Colloquium, Nara Women's University.
Milnor K-theory attached to semi-abelian varieties and class field theory. May 26. Workshop on arithmetic geometry in Tambara, Numata.
Counter examples to variants of the Milnor-Bloch-Kato conjecture. March 12. Industrious Number Theory, Korea Institute for Advanced Study.
2008
Degenerate fibers of the Mumford system and rational solutions to the KdV hierarchy. December 11. Combinatorics and representation seminar, Okayama University.
Topics on Milnor K-groups attached to algebraic groups. November 21. Number theory seminar, Nagoya University.
Counter examples to variants of the Milnor-Bloch-Kato conjecture. November 6. P-adic method and its applications in arithmetic geometry at Sendai, Tohoku University.
Higher dimensional class field theory and symbols on algebraic groups. October 24. Colloquium, Tokyo University of Science, Noda.
Degenerate fibers of the Mumford system and rational solutions to the KdV hierarchy. September 23. Number Theory and Physics at the Crossroads, Banff, Canada.
Higher dimensional class field theory and symbols on algebraic groups. September 19. Number theory seminar, Queen's University, Canada.
Generalized Jacobians and rational solutions for the Mumford system. June 6. Journées integrables, Université de Poitiers, France.
Milnor K-group attached to a torus and Birch-Tate conjecture. January 7. Okayama University.
2007
Recent development on the even Mumford system. November 21. Séminaire groupes, algèbres, et géométrie. Université de Poitiers, France.
Milnor K-group attached to a torus and Birch-Tate conjecture. August 28. Algebraic geometry seminar. Hokkaido University of Education, Hakodate.
Milnor K-group attached to a torus and Birch-Tate conjecture. August 7. Symposium on Algebra. Kobe University.
Milnor K-group attached to a torus and Birch-Tate conjecture. June 1. Algebra seminar. Kyushu University.
Class field theory for a product of curves over local fields. March 21. Number Theory and Algebraic Geometry Seminar. Katholieke Universiteit Leuven, Belgium.
Cohomology of affine Jacobi variety and integrable system (after Nakayashiki-Smirnov). February 21. Universität Münster, Germany.
The space of observables for classical integrable systems with algebro-geometric method. (With Rei Inoue.) February 8. Statistisches Seminar. Bereich Physik, Bergische Universität Wuppertal, Germany.
Class field theory for a product of curves over local fields. February 6. Oberseminar Algebra und Geometrie. Universität Bielefeld, Germany.
2006
Jacobian variety and integrable system --- after Mumford, Beauville and Vanhaecke (With Rei Inoue and Yukiko Konishi.) September 19. Mathematical Society of Japan meeting, infinite analysis session. Osaka City University.
Class field theory for a product of curves over local fields. August 2. Mini-workshop on modular forms, Calabi-Yau varieties and string duality. Tsuda College.
Arithmetic of a product of curves over local fields. May 1. Seminar at National Center for Theoretical Sciences (South), National Cheng Kung University, Taiwan.
Arithmetic of a product of curves over local fields. April 17. Colloquium. Tohoku University.
Arithmetic of a product of curves over local fields. February 21. Workshop on algebraic geometry. Kagoshima University.
2005
Chow motive of a product of curves and Milnor K-groups. December 20. Workshop on Motives. Tokyo University.
Mumford curves, p-adic periods and algebraic cycles. October 20. Algebra seminar. Tohoku University.
Mumford system, Noumi-Yamada system and cohomology of affine Jacobi variety. (With Rei Inoue.) September 19. Mathematical Society of Japan meeting, infinite analysis session. Okayama University.
Cohomology of affine Jacobi variety and integrable system (after Nakayashiki-Smirnov). June 12. Mini-workshop on modular forms, Calabi-Yau varieties and string duality. Tsuda College.
Brauer-Manin pairing for a product of Mumford curves. June 10. Algebra seminar. Kyushu University.
Brauer-Manin pairing for a product of Mumford curves. February 9. Mini-workshop with Yves André. Hiroshima University.
2004
On Chow and Brauer groups of varieties over local fields. July 18. Workshop on Calabi-Yau Varieties, Mirror Symmetry and Related Topics. Tsuda College.
On Chow and Brauer groups of surfaces over local fields. June 21. Canadian Number Theory Association VIII Meeting. Toronto University.
Tate duality and ramification of division algebras. February 6. Seminar on Number Theory and Automorphic forms. Osaka University.
2003
On Chow groups of surfaces over local fields. December 3. Algebraic Number Theory and Related Topics. Research Institute for Mathematical Sciences, Kyoto University.
On Chow groups of surfaces over local fields. November 21. Symposium on Arithmetic Geometry. Hokkaido University.
On Chow and Brauer groups of surfaces over local fields. October 10. Algebra seminar. Hiroshima University.
p-primary torsion zero-cycles on an abelian surface over a p-adic field. September 25. Mathematical Society of Japan meeting, algebra session. Chiba University.
2002
Formal Chow group and relative syntomic cohomology. December 5. Algebra colloquium. Bielefeld University.
On the structure of Chow groups of surfaces over local fields. October 9. London number theory seminar. London University, King's college.
2001
Tate Duality and Ramification of Division Algebras. September 27. Algemeen colloquium. Utrecht University.
On Tate duality for Jacobian varieties. September 6. The 15th Czech and Slovak international conference on number theory. Ostrava, Czech.
1999
Formal Chow groups, p-divisible groups, and syntomic cohomology. October 26. Number theory semiar. Tokyo Metropolitan University.
Formal Chow groups, p-divisible groups, and syntomic cohomology. October 5. Conference on Hodge theory and algebraic geometry. Kagoshima University.
Formal Chow groups, p-divisible groups, and syntomic cohomology. July 9. Colloquium. Tsukuba University.
Formal Chow groups, p-divisible groups, and syntomic cohomology. April 5. Algebraic and Complex Geometry Seminar. Osaka University.
Formal completion of Chow groups and syntomic cohomology. January 20. Number theory seminar. Tokyo University.
1997
Ramification of Brauer groups of curves over local fields. November 14. Number Theorey Seminar. Kanazawa University.
1996
Ramification theory for division algebras of certain type. September 3. Number Theory Symposium. Tsuda College.
Reduced norm map of division algebras over complete valuation fields of certain type. July 10. Number theory seminar. Tokyo University.