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T. Ibukiyama

Department of Mathematics
Graduate School of Science, Osaka University

Toyonaka, Osaka, 560-0043 Japan

伊吹山知義　オフィシャルサイト

Talks outside Japan  |  Talks in Japan  | 
Organization of meetings

Last modified December 25, 2023.

Talks outside Japan

  1. Tomoyoshi Ibukiyama, Differential operators on automorphic forms, special functions, and arithmetic applications, Univ. Heidelberg, Heidelberg, Germany, November 22, 2024,
  2. Tomoyoshi Ibukiyama, Genus Character L-functions of Non-maximal Quadratic Orders, Academia Sinica, Taipei, November 17, 2023,
  3. Tomoyoshi Ibukiyama, Dimensions of paramodular forms and algebraic modular forms with involution, Academia Sinica, Taipei, November 13, 2023,
  4. Tomoyoshi Ibukiyama, Dimensions of paramodular forms with Atkin-Lehner sign, Arithmetic, Geometry, Cryptography and Coding theory, CIRM, Luminy, France, June 7, 2023,
  5. Tomoyoshi Ibukiyama, Survey on quaternion hermitian lattices and its application to supersingular abelian varieties. , Arithmetic, Geometry, Cryptography and Coding theory, CIRM, Luminy, France, June 1, 2021
  6. Tomoyoshi Ibukiyama, Automorphic differential operators and special functions, Sirius Mathematics Center conference "Integrable systems and automorphic forms, February 25, 2020
  7. Tomoyoshi Ibukiyama, A new pullback formula and a half integral version of Harder's conjecture on congruences, Oberwolfach workshop "Modular forms" December 17, 2019
  8. Tomoyoshi Ibukiyama, Algebraic modular forms of symplectic groups and Ihara lifts, "Conference on the arithmetic theory of quadratic forms", Jan. 9, 2019, Seoul National University, Korea.
  9. Tomoyoshi Ibukiyama, Supersingular abelian surfaces and polarizations, November 14, 2018, Seminar of Academia Sinica, Taipei.
  10. Tomoyoshi Ibukiyama, Symplectic algebraic automorphic forms and Ihara lifts, Nov. 12, 2018, National Taiwan Univ. Colloquium, Taipei.
  11. Tomoyoshi Ibukiyama, Explicit construction of theta series for any vector-valued weight and applications. May 31, 2018, American Univ. Beirut, Beirut, Lebanon.
  12. Tomoyoshi Ibukiyama, Quaternion hermitian lattices and supersingular abelian varieties, May 9, May 16, 2018, Seminar of Wuhan Univ. Wuhan, China.
  13. Tomoyoshi Ibukiyama, Universal automorphic differential operators and a theory of special functions, May 11, 2018, Colloquium of Wuhan Univ. Wuhan, China.
  14. Tomoyoshi Ibukiyama, Universal automorphic differential operators on Siegel modular forms, July 10, 2017, "Aspects of automorphic forms and applications", University of Hong Kong, Hong Kong, China.
  15. Tomoyoshi Ibukiyama, Introduction to Siegel modular forms and automorphic differential operators, June 9, June 14, June 19, 2017, Shanghai Jiao Tong Univ. Shanghai, China.
  16. Tomoyoshi Ibukiyama, Siegel modular forms and Ihara lifts to algebraic modular forms, May 26, 2017, "Modular forms are everywhere", MPI, Bonn, Germany
  17. Tomoyoshi Ibukiyama, Universal automorphic differential operators on Siegel modular forms, March 25, 2017, JAMI 2017, Local zeta functions and the arithmetic of moduli spaces, A conference in memory of Jun-Ichi Igusa, Johns Hopkins Univ. Baltimore, USA.
  18. Tomoyoshi Ibukiyama, Introduction to Siegel modular forms and their construction. February 22, 23, 2017, Seminar at Acadmia Sinica, Taipei.
  19. Tomoyoshi Ibukiyama, Conjectures on Siegel modular forms of half-integral weight and integral weight. February 20, 2017, Lakeside Seminar, Academia Sinica, Taipei.
  20. Tomoyoshi Ibukiyama, Modular forms on the compact symplectic group, September 28, 2016, Seminar at Shanghai Jiao Tong University, Shanghai, China.
  21. Tomoyoshi Ibukiyama, Siegel modular forms and automorphic differential operators, September 22 and 27, 2016, Seminar at Shanghai Tongji University, China.
  22. Tomoyoshi Ibukiyama, Conjecture on Shimura type correspondence of degree two and Harder's conjecture, July 7, 2016, Automorphic forms on metaplectic groups and related topics, IISER(Indian Institute of Science Education and Research), Pune, India
  23. Tomoyoshi Ibukiyama, Siegel modular forms and quaternion hermitian forms. June 27, 2016, Arithmetic and low dimensional hyperbolic spaces, Galatasaray Univ. Istanbul, Turkey.
  24. Tomoyoshi Ibukiyama, Higher spherical polynomials motivated by differential operators on Siegel modular forms. February 25, 2016, Colloquium Inst. Math, Academia Sinica, Taipei, Taiwan.
  25. Tomoyoshi Ibukiyama, Quaternion hermitian forms and supersingular geometry (I) (II), February 22, 24, 2016, NCTS Number Theory Seminar, Academia Sinica, Taipei, Taiwan.
  26. Tomoyoshi Ibukiyama, The vanishing criterion of automorphic forms on tube domains, January 21, 2016, Math. Forschungsinstitut Oberwolfach, Germany.
  27. Tomoyoshi Ibukiyama, The universal higher spherical series associated with differential operators on Siegel modular forms, ASARC Workshop on Coding theory and Number Theory, January 13, 2016, Haeundae Riviera Hotel, Pusan, Korea.
  28. Tomoyoshi Ibukiyama, The universal differential operators on Siegel modular forms, Number Theory Lunch Seminar, August 19, 2015, MPIM, Germany.
  29. Tomoyoshi Ibukiyama, The universal differential operators on Siegel modular forms, July 30, 2015, Univ. Mannheim, Germany.
  30. Tomoyoshi Ibukiyama, New theorems on Jacobi forms of general degree, Automorphic forms: Advances and Applications, May 25, 2015, CIRM, Luminy, France
  31. Tomoyoshi Ibukiyama, Higher Spherical Polynomials, Algebraic Combinatorics Workshop, November 27, 2014, Univ. Science and Technology of China, Hefei, China.
  32. Tomoyoshi Ibukiyama, Differential operators on Siegel modular forms and applications, October 28, 2014, Tsinghua Univ. Seminar, Beijing, China.
  33. Tomoyoshi Ibukiyama, Construction of liftings to vector valued Siegel modular forms, April 29, 2014, workshop in Oberwolfach, "Modular forms", organized by J. Bruinier, A. Ichino, T. Ikeda, O. Immamoglu.
  34. Tomoyoshi Ibukiyama, Jacobi forms of degree two, December 18, 2013, 41st Seminar Aachen-Koeln-Lille-Siegen on Automorphic Forms at MPI in Bonn.
  35. Tomoyoshi Ibukiyama, Differential operators on Siegel modular forms and applications, November 25, 2013, Oberseminar Zahlentheorie, Univ. Koln.
  36. Tomoyoshi Ibukiyama, Differential operators on Siegel modular forms and various applications, November 8, 2013, Number Theory Seminars, ETH Zurich.
  37. Tomoyoshi Ibukiyama, A half-integral weight version of Harder's conjecture on congruences, September 25, 2013, Number Theory Lunch, Max Planck Institute fuer Mathematik, Bonn, Germany.
  38. Tomoyoshi Ibukiyama, Differential operators on Siegel modular forms and its various applications, September 16, 2013, Colloquium of Math. Department, Durham, UK
  39. Tomoyoshi Ibukiyama, Shimura type conjecture revisited, March 19, 2013, Darmstadt, Germany.
  40. Tomoyoshi Ibukiyama, Differential operators on Siegel modular forms, Seminar at Shanghai Jiao Tong Univ. November 16, 2012.
  41. Tomoyoshi Ibukiyama, Dimensions of Siegel modular forms and related theories Seminar at Shanghai Tongji University November 15, 2012.
  42. Tomoyoshi Ibukiyama, Structure of Jacobi forms of degree two, Seminar at Shanghai Tongji University, China, August 24, 2012.
  43. Tomoyoshi Ibukiyama, Higher spherical polynomials and holonomic systems, at Shanghai Jiao Tong Univ., China, Main Session of Conference on Algebraic Combinatorics Shanghai 2012, August 20, 2012.
  44. Tomoyoshi Ibukiyama, Exact critical values of a symmetric fourth L function and Zagier's conjecture, The 26-th automorphic workshop, Vancouver, University of British Columbia, Vancouver, Canada, April 28, 2012.
  45. Tomoyoshi Ibukiyama, Several conjectures on liftings between Siegel modular forms, International Workshop on Mathematics, New Developments in Modern Number Theory and Applied Mathematics & Special Contribution of Students and E-learning, GUtech, Muscut, Oman, February 19, 2012
  46. Tomoyoshi Ibukiyama, Exact critical values of a symmetric fourth L function and Zagier's conjecture, Invited talk in Arbeitstagung, Bonn, Germany, June 25, 2011.
  47. Tomoyoshi Ibukiyama, Jacobi forms of degree two of index two, Conference on "Explicit modular forms and application" in CIRM, Luminy France, May 9, 2011.
  48. Tomoyoshi Ibukiyama, Trace formula of superspecial abelian varieties with real multiplications, First Joint meeting of AMS-Somachi (Sociedad de Mathemática de Chile), Special Session: Arithmetic of Quadratic Forms and Integral Lattices, Pucon, Chile, December 15, 2010
  49. T. Ibukiyama, Type numbers of quaternion hermitian lattices, quinary lattices, and supersingular abelian varieties, December 17, 2009, Joint meeting of KMS and AMS, Ewha Women Univ. Seoul, Korea.
  50. T. Ibukiyama, Supersingular abelian varieties and modular forms, June 7, 2009, Microsoft Research Institute, Redmond, WA. USA.
  51. Tomoyoshi Ibukiyama, Supersingular abelian varieties and modular forms, March 7, 2009, HRI International Conference in Mathematics, Harish Chandra Research Institute, Allahabad, India
  52. Tomoyoshi Ibukiyama, Differential operators on Siegel modular forms and holonomic system, Conference on Codes, Invariants and Modular Forms, and Oberseminar of Max Planck Instutut f&oumul;ur Mathematik, Bonn, Germany, July 10, 2008
  53. Tomoyoshi Ibukiyama, Dimensions of Siegel Modular Forms, 22-th Annual Workshop on Automorphic Forms and Related Topics, March 10, 2008, at Blocker Hall, Texas A & M University, College Station, TX, USA.
  54. Tomoyoshi Ibukiyama, Siegel modular forms of small weight and Witt operators, International Conference on The Algebraic and Arithmetic Theory of Quadratic Forms 2007, December 13, 2007, Lake Llanquihue, Puerto Montt, Chile
  55. Tomoyoshi Ibukiyama, Siegel modular forms of weight three and supersingular abelian surfaces, Modular forms and Moduli spaces, Satellite Meeting for Festival dedicated to 300-th birthday of Leonhard EULER, organized by V. Gritsenko, D. Orlov, P. Zograf. July 9, 2007, St. Petersburg, Russia
  56. Tomoyoshi Ibukiyama, Taylor expansion of Jacobi forms of general degree, Conference "Formes de Jacobi et applications" in CIRM Luminy France, May 8, 2007
  57. Tomoyoshi Ibukiyama, Siegel modular forms of weight three and supersingular abelian surfaces, March 14, 2007, Number Theory Lunch Seminar, Max Planck Insitutut für Math.
  58. Tomoyoshi Ibukiyama, Dimension of Siegel Modular Forms, March, 2007, Univ. Rome "La Sapienza", Rome, Italy.
  59. Tomoyoshi Ibukiyama, Siegel modular forms of half-integral weight and conjectures on Shimura type correspondence and liftings, October 9, 2006, Conference "Modular Forms" at Schiermonnikoog, The Netherland, organized by Gerald van der Geer, Bas Edixhoven and Ben Moonen.
  60. Tomoyoshi Ibukiyama, Siegel modular forms of small weights and conjectural correspondence of Shimura or Langlands type, talk on September 8 in INdAM,WORKSHOP on Modular Forms, Automorphic Forms and Related Moduli Spaces from September 5 to 9, 2005, organized by R. Salvati Manni and van Geemen
  61. Tomoyoshi Ibukiyama, "Differential operators on Siegel modular forms, special functions, and applications" The 19-th annual workshop on automorphic forms and related topics, Univ. North Texas, March 16 to 21, 2005.
  62. Tomoyoshi Ibukiyama, Conjecture of a Shimura correspondence for Siegel Modular Forms of Degree Two, 14:00-14:50, January 12, 2005. Seminar AACHEN-KOELN-LILLE-SIEGEN ON AUTOMORPHIC FORMS
  63. Tomoyoshi Ibukiyama, Oberwolfach Conference, Gitter und Anwendungen, K. Saito's Conjecture on positivity of eta products and "extremal pair" of lattices, January 7, 2005, Mathematiches Forschungsinstitut Oberwolfach, Oberwolfach, Germany
  64. Tomoyoshi Ibukiyama A conjecture on Shimura correspondence between vector valued Siegel modular forms of degree two, Number Theory Conference in honour of Harold Stark, Minnesota, USA, August 7, 2004
  65. Tomoyoshi Ibukiyama, Explicit structures of Siegel modular forms and differential operators, KIAS-Postech joint workshop on number theory and modular forms, Seoul, Korea, Dec.6 , 2002.
  66. Tomoyoshi Ibukiyama, Dimensions of modular forms and zeta functions, Number Theory Seminar of University of Wisconsin, Madison, October 17, 2002
  67. Tomoyoshi Ibukiyama, Explicit structures of Siegel modular forms and differential operators, AMS regional meeting at Madison, WI USA, Special Session on Arithmetic Geometry, October 13, 2002.
  68. Tomoyoshi Ibukiyama, Explicit structures of Siegel modular forms and differential operators, Arithmetique et Combinatoire, CIRM, Luminy, France, September 26, 2002.
  69. Tomoyoshi Ibukiyama, Siegel modular forms of half integral weights and a lifting conjecture, September 24, 2001, Conference "Formes de Jacobi et applications" in CIRM Luminy France
  70. Tomoyoshi Ibukiyama, Siegel modular forms of half integral weights and a lifting conjecture, Number Theory Seminar, Max Planck Institut for Mathematics, February 21, 2001
  71. Tomoyoshi Ibukiyama, General theory of differential operators and construction of Siegel modular forms, Reseaux et formes quadratiques, conference in CIRM, France, September 25-29, 2000
  72. Tomoyoshi Ibukiyama, Modular forms of rational weights and unitary reflection groups, The 14-th annual workshop on automorphic forms and related topics, March 27, 2000, Boulder, Colorado, USA
  73. Modular forms of rational weights, Heidelberg Univ. Dec. 10, 1999
  74. On L functions of ternary zero forms, Yonsei Univ. Seoul, Korea, Jan. 6, 19
  75. Zeta functions of indefinite quadratic forms, Mini course in Number Theory, Sogang University, Jan. 5, 6, 7, 8, 1999
  76. Koecher-Maass series of Eisenstein series, Conference in Oberwolfach institut, Modulformen mehrere variablen, December 7, 1998, with H. Katsurada.
  77. Koecher-Maass series of Siegel Eisenstein series, Number Theory Lunch, Max Planck Institut für Mathematik, October 15, 1997.
  78. Differential operators on automorphic forms, harmonic polynomials, and differential equations, Max Planck Institut für Mathematik, March 1997, Germany
  79. On zeta functions of prehomogeneous vector spaces related to dimension formulae, Max Planck Institut Universität Mathematik, February 1997, Germany
  80. On Koecher Maass series of Siegel Eisenstein series and related zeta functions, Department of Math. Heidelberg Univ. December 1996, Germany
  81. On a class of easy zeta functions related with dimension formula, Department of Math. Mannheim Univ. December 1996, Germany
  82. Dimensions of automorphic forms and related zeta functions, Max Planck Arbeitsgruppe Berlin : Geometrie u. Zahlen Theorie, November 1996, Germany
  83. International conference in Schloss Ringberg on abelian varieties, Rottach-Egern, Germany (1987, July).
  84. International conference on modular forms, Göttingen, Germany, (1987, July).
  85. International conference in Oberwolfach on modular forms of several variables, organized by W. Baily Jr. and Klingen, Oberwolfach, Germany (1985, July)
  86. International conference on L2-cohomology in Max-Planck institut für Mathematik, Bonn, Germany (1984, March).

Talks in Japan

  1. Tomoyoshi Ibukiyama, Theta series with spherical functions and Hermitian modular forms, Algebra Seminar, Kanazawa Univ. December 10, 2024.
  2. Tomoyoshi Ibukiyama, Rankin-Cohen differential operators on Siegel modular forms and applications, Sendai spring conference on automorphic forms, June 21, 2024.
  3. Tomoyoshi Ibukiyama, Differential operators on automorphic forms, special functions, and arithmetic applications, The third Sendai mini-workshop on automorphic forms, "Automorphic forms, Algebraic geometry, and (automorphic) differential operators, February 4, 2024.
  4. Tomoyoshi Ibukiyama, Dimension formulas of paramodular forms with involution, RIMS workshop, January 24, 2024.
  5. Tomoyoshi Ibukiyama, Genus character L functions of non-maximal quadratic orders and adeles, Autumn meeting of MSJ(Tohoku University）, September 20, 2023.
  6. Tomoyoshi Ibukiyama, Genus character L functions of non-maximal quadratic orders and adeles, Autumn meeting of MSJ(Tohoku University）, September 20, 2023.
  7. Tomoyoshi Ibukiyama, Differential operators on Siegel modular forms and Laplace transforms, Spring meeting of MSJ(Chuo University）, March 18, 2023.
  8. Tomoyoshi Ibukiyama,, Dimensions of paramodular forms with involutions, Spring meeting of MSJ（Chuo University）, March 18, 2023.
  9. Tomoyoshi Ibukiyama, Genus character $L$ functions of quadratic order in an adelic way, Arithmetic Seminar Day in Toyonaka, March 13, 2023
  10. Tomoyoshi Ibukiyama, Differential operators on Siegel modular forms and Laplace transforms, RIMS workshop, January 27, 2023
  11. Tomoyoshi Ibukiyama, Supersingular loci of low dimensions and parahoric subgroups RIMS workshop "Theory and applications of Supersingular curves and Supersingular Abelian Varieties" October 13, 2020
  12. Tomoyoshi Ibukiyama, Pullback formulas and applications, January 24, 2020 Conference on "Analytic, geometric and p-adic aspects of automorphic forms and L-functions" RIMS, Kyoto
  13. Tomoyoshi Ibukiyama, Supersingular abelian surfaces, automorphisms, and the trace formulas October 4, 2019, Conference on "Supersingular abelian varieties and related arithmetics" at Nagoya univ.
  14. Tomoyoshi Ibukiyama, A survey on polarizations of superspecial abelian varieties and the field of definition, September 30, 2019, Conference on "Supersingular abelian varieties and related arithmetics" at Nagoya univ.
  15. Tomoyoshi Ibukiyama, A survey on quaternion hermitian lattices and algebraic modular forms, September 30, 2019, Conference on "Supersingular abelian varieties and related arithmetics" at Nagoya univ.
  16. Tomoyoshi Ibukiyama, Graded rings of modular forms of rational weight, March 11. 2019、Low dimensional topology and number theory XI, Osaka Univ.
  17. Tomoyoshi Ibukiyama, Automorphic differential operators and special polynomials, Dec. 11. 2018、Study of algebraic combinatorics and related theory of group and algebra、 RIMS, Kyoto
  18. Tomoyoshi Ibukiyama, Supersingular abelian varieties and arithmetic of quaternion hermitian forms, Dec. 6, 2018, Tohoku Algebra Seminar, Tohoku Univ.
  19. Tomoyoshi Ibukiyama, Ihara lifts and conjectural correspondences between symplectic automorphic forms of genus two. May 23, 2018, RIMS workshop, Profinite Monodromy, Galois Representations, and Complex Functions、RIMS, Kyoto.
  20. Tomoyoshi Ibukiyama, Siegel modular forms of middle parahoric subgroup and Ihara lift, January 18, 2018, RIMS workshop, Analytic and Arithmetic Theory of Automorphic Forms, RIMS, Kyoto.
  21. Tomoyoshi Ibukiyama, (1) Problem setting and first characterization by invariant harmonic polynomials.(2) Two canonical bases of spherical polynomials. (3) Inhomogeneous variables and holonomic systems. (4) (i) Universal generating series and universal automorphic differential operators. (ii) Another one-line formula for special cases September 3, 4, 5, 6, The 20-th autumn workshop on number theory at Hakuba, "Automorphic differential operators on Siegel modular forms" Hotel Abest Happo Aldea (Hakuba village in Nagano prefecture.)
  22. Tomoyoshi Ibukiyama, G-type numbers of quaternion hermitian lattices and supersingular geometry. February 9, 2017, RIMS workshop, Modular forms and related topics, RIMS, Kyoto.
  23. Tomoyoshi Ibukiyama, Siegel's zeta functions of general indefinite quadratic forms, "School of Mock Modular Forms and Related Topics" Industry-University-Government Collaboration Innovation Plaza,Kyushu University, November 24, 2016.
  24. Tomoyoshi Ibukiyama, The universal differential operators on Siegel modular forms, Workshop at RIMS, Kyoto Univ. Automorphic forms, Automorphic L-functions and related topics, February 3, 2016.
  25. Tomoyoshi Ibukiyama, The universal differential operators on Siegel modular forms, November 27, 2015, Number Theory Seminar at Waseda University
  26. T. Ibukiyama, Siegel modular forms and computer calculations: personal experience, results, and open problems, Workshop on Computational Number Theory with Implementations 2015, February 22, 2015.
  27. T. Ibukiyama, Three theorems on Jacobi forms of general degree, RIMS workshop "Modular Forms and Automorphic Representations", Kyoto Univ. February 2, 2015.
  28. T. Ibukiyama, Correspondence between symplectic automorphic forms, Workshop on number theory of automorphic forms, Kumamoto univ. January 8, 2015.
  29. T. Ibukiyama, Jacobi forms of general degree, The 17-th Autumn Workshop on Number Theory, Hakuba Highmount Hotel, November 9, 2014.
  30. T. Ibukiyama, Construction of liftings to vector valued Siegel modular forms, The 18th Joint Workshop on Number Theory, Waseda University, March 12, 2014.
  31. T. Ibukiyama, Higher Spherical Polynomials (joint work with Don Zagier) RIMS workshop, Automorphic Forms and Related Zeta Functions, January 22, 2014.
  32. T. Ibukiyama, Shimizu L function of quadratic orders, compsition and genus theory, and trace formula, Waseda University Number Theory Seminar, January 17, 2014.
  33. T. Ibukiyama, Vector values Jacobi forms of degree two of index one, Workshop on Modular Forms and Jacobi Forms, Joetsu University of Education, June 11, 2013
  34. T. Ibukiyama, Structures of Vector Valued Jacobi Forms of Degree two and Dimension Formulas, Seminar on Algebra, Ehime Univ. April 22, 2013.
  35. T. Ibukiyama, Differential operators on automorphic forms and the theory of classical groups, Graduate School of Information Sciences, Colloquium of information mathematics, February 20, 2013.
  36. T. Ibukiyama, Structures and dimensions of vector valued Jacobi forms, and conjectures of Shimura type and Harder type, RIMS conference, Automorphic representations and related topics, organized by Atsushi Ishino and Taku Ishii, January 25, 2013.
  37. T. Ibukiyama, Differential operators on automorphic forms and their application, Seminar on Number Theory in Waseda University, January 11, 2013.
  38. T. Ibukiyama, Shimura type and Harder type conjectures revisited, liftings, dimensions and examples, The 15-th Autumn Workshop on Number Theory, November 2, 2012, at Hakuba Highmount Hotel.
  39. T. Ibukiyama, A lift to vector valued Siegel modular forms of half-integral weight and Conjectures of Shimura type revisited, General talk in the Algebra Section of the Autumn Meeting of Math. Soc. Japan , September 18, 2012
  40. Differential operators on Siegel modular forms, Conference on Groups, VOAs and Related Structures in Honor of Masahiko Miyamoto, at Univ. Tsukuba, September 11, 2012.
  41. T. Ibukiyama, Conjectures on correspondence of Siegel Modular forms and Dimension Formulas, Special Lecture for receiving the Award of Algebra in the Spring Meeting of Math. Soc. Japan, March 28, 2012.
  42. T. Ibukiyama and H. Katsurada, Exact critical values of the standard L-functions of vector valued Siegel modular forms, January 19, 2012, Workshop at RIMS Kyoto, "Study of automorphic forms and automorphic L functions".
  43. T. Ibukiyama, Exercises on Jordan algebras and tube domains (A vanishing criterion on automorphic forms on symmetric tube domains) The 14-th Autumn workshop on Number theory, Hakuba Highmount hotel, Nov. 4, 2011
  44. T. Ibukiyama, Saito-Kurokawa Lift 2, The 19-th Summer School on Number Theory, "Liftings",　September 6, 2011, at FujiHakoneLand Schole Plaza Hotel,
  45. T. Ibukiyama, Exact critical values of the symmetric fourth L function and Zagier's conjecture, Seminar on Number Theory and Automorphic Forms of Osaka University, June 17, 2011
  46. T. Ibukiyama, Those days of the new discovery on zeta functions of prehomogeneous vector spaces, its past and future, "Special meeting of thinking of Hitoshi Saito". October 2, 2010.
  47. T. Ibukiyama, Eichler-Selberg Trace formula, September 7, 2010, The 18-th Summer School on Number Theory, "Introduction to Arthur-Selberg trace formula", Yamanaka-onsen Kajika-So Royal Hotel. /li>
  48. T. Ibukiyama, The Taylor expansion of Jacobi forms of general degree and some application to explicit structures of higher indices, RIMS conference at Univ. Tokyo, Automorphic Forms, automorphic representations, and related topics, January 21, 2010, organized by M. Tsuzuki
  49. T. Ibukiyama, Differential operators on Siegel modular forms as special functions and applications, September 15, 2009, Geometry and Analysis of Automorphic Forms of Several Variables (Oda kanreki), Univ. Tokyo.
  50. T. Ibukiyama, Type numbers of quaternion hermitian lattices, quinary quadratic forms and supersingular abelian varieties, Workshop at RIMS, Kyoto, "Algebraic Number Theory and Related Topics", Dec. 11, 2008
  51. T. Ibukiyama Saito-Kurokawa lifting and Jacobi forms of level N, Sep. 12, 2008, The 11-th Autumn Workshop on Number Theory,
  52. T. Ibukiyama Towards explicit trace formulas, Sep. 6, 2008, Explicit Structures in Modular Forms and Number Theory, Kinki Univ.
  53. T. Ibukiyama, Generating functions and holonomic system of orthogonal polynomials of several variables consistint of invariant harmonic polynomials; New several vaiable version of Gegenbauer polynomials", October 8, 2007 in Workshop on study of accessary parameters 2, Kumamoto Univ. Organized by Yoshishige. Haraoka.
  54. T. Ibukiyama, Dimension formulae of Siegel modular forms of weight three and supersingular abelian surfaces, The 4-th Spring Conference on Modular Forms and Related Topics, "Siegel Modular Forms and Abelian Varieties", February 6, 2007
  55. T. Ibukiyama, Paramodular Forms and Compact Twist: Dimensions and Traces, The 9-th Autumn Workshop on Number Theory, Hakuba, organized by M. Furusawa, November 10, 2006.
  56. T. Ibukiyama, Siegel modular forms of half-integral weight and conjectures on Shimura-type correspondence and liftings, Conference on Modular Forms, Schiermonnikoog in the Netherland, organized by G. van der Geer, Bas Edixhoven, Ben Moonen. October 9, 2006
  57. T. Ibukiyama, Siegel modular forms of small weights and conjectural correspondence of Shimura and Langlands type, February 20, 2006, Conference on L function at Kyushu Univ. organized by Lin Weng and Masanobu Kaneko
  58. T. Ibukiyama and N. P. Skoruppa, Jacobi forms of weight 1 and applications to Siegel modular forms of critical weight, Workshop in RIMS, Study of Automorphic Forms, L functions, Periods, January 24, 2006.
  59. T. Ibukiyama, Dimension formulas of automorphic forms, Conference in celebration of Yasuo Morita's 60-th birthday, November 22, 2005.
  60. T. Ibukiyama, Higher Spherical Polynomials and Functions, The Second COE Workshop on Sphere Packings, at Kyushu Univ. May 31, 2005
  61. T. Kuzumaki and T. Ibukiyama, Differential operators from H2n to Hn×Hn and other explicit operators, The 7-th Autumn Workshop on Number Theory, "Differential operators on Siegel modular forms and application", October 27, 2004.
  62. T. Ibukiyama, The 7-th Autumn Workshop on Number Theory, "Differential operators on Siegel modular forms and application", October 26, 2004.
  63. T. Ibukiyama, Holomorphic Differential operators on Siegel modular forms, The 7-th Autumn Workshop on Number Theory, "Differential operators on Siegel modular forms and application", October 25, 2004.
  64. T> Ibukiyama, Various lifting conjectures on Siegel modular forms of degree two and Shimura type correspondence, August 2, 2004, The 47-th Symposium on Algebra, Sendai International Center.
  65. T. Ibukiyama, K. Saito's conjecture eta products, Seminar on Complex geometry and mathematical physics, RIMS, May 29, 2004.
  66. T. Ibukiyama, Construction of vector valued Siegel modular forms and conjectures on Shimura type correspondence, Seminar on Number Theory, Department of mathematics, Faculty of Science, Hiroshima University, May 14, 2004.
  67. T. Ibukiyama, Construction of vector valued Siegel modular forms and conjectures on Shimura type correspondence, Annual meeting of Mathematical Society of Japan, March 28, 2004, General talk at Tsukuba Univ. in Algebra Section.
  68. Tomoyoshi Ibukiyama, Construction of Vector Valued Siegel Modular Forms and Shimura Correspondence, The Third Spring Conference on Modular Forms and Related Topics, Curreac, Hamamatsu, Japan, February 16, 2004.
  69. T. Ibukiyama, Formulation of conjectures on Shimura type correspondence of Siegel modular forms and examples of cubic zeta liftings. Workshop in RIMS, Construction of automorphic forms and its application, January 21, 2004.
  70. Tomoyoshi Ibukiyama, Graded rings of Siegel modular forms and differential operators, Conference on Zeta Functions, Topology and Quantum Phisics, Kinki University, 2003.3.6
  71. T. Ibukiyama, Application of modular forms to the theory of quadratic forms, The 2nd Spring Conference on Automorphic Forms and Related Topics, February 15, 2003.
  72. T. Ibukiyama, Introduction to Siegel modular forms, The 1st Spring Conference on Automorphic Forms and Related Topics, "The Ring of Modular Forms", February 16, 2002.
  73. T. Ibukiyama, Vector valued Siegel modular forms of Sym(4) and Sym(6), Workshop in RIMS, Study of Dirichlet series associated with automorphic forms, January 30, 2002.
  74. Syuichi Hayashida and Tomoyoshi Ibukiyama, A lifting conjecture on Siegel modular forms of half integral weights, September 11, 2001, Japanese-German seminar on "Explicit structures of modular forms and zeta functions" at Hakuba Highmount Hotel (The 4-th Hakuba conference), supported by JSPS and DFG.
  75. T. Ibukiyama, "Easy" zeta functions, The 9-th Summer School on Number Theory, July 19, 2001.
  76. T. Ibukiyama, Ring of modular forms of one variable of fractional weight, Seminar on Number Theory, Kyoto Univ. May 11, 2001.
  77. T. Ibukiyama, Graded rings of modular forms of rational weights of level 11 and 13, Waseda University Symposium on Number Theory, March 12, 2001, at Faculty of Science, Waseda Univ.
  78. T. Ibukiyama and S. Hayashida, A lifting conjecture on Siegel modular forms of half integral weights and Jacobi forms, January 31, 2001, Mini-conference on Number Theory, at Machikaneyama Kaikan, Osaka University.
  79. T. Ibukiyama, Structures of vector valued Siegel modular forms and differential operators, Workshop in RIMS, Algebraic Number Theory and Related Topics, December 19, 2000.
  80. Tomoyoshi Ibukiyama、A general theory of differential operators on Siegel modular forms and special polynomials, Conference on codes, lattices, modular forms and vertex operator algebras, Yamagata University October 3, 2000.
  81. T. Ibukiyama, On dimensions of automorphic forms of Tube domains, THe 3rd Hakuba Autumn Workshop on Number Theory, Hakuba Highmount Hotel, 10, September, 2000.
  82. T. Ibukiyama, Modular forms of fractional weight, The 8-th Summer School on Number Theory, Oumi-Hachiman Kokumin Kyukamura, July 12, 2000
  83. T. Ibukiyama and S. Hayashida, Siegel modular forms of half integral weights and a lifting conjecture, Workshop at RIMS, Automorphic forms on algebraic groups, automorphic representations and automorphic L functions, June 28, 2000.
  84. T. Ibukiyama, Modular forms of rational weights and modular varieties, Waseda Seminar on Number Theory, Faculty of Science, Waseda University, June 9, 2000.
  85. T. Ibukiyama, Modular forms of rational weights, Colloquium on Mathematical Sciences, Muroran Institute of Technology, March 8, 2000.
  86. T. Ibukiyama, Differential operators on automorphic forms, Mini-conference on modular forms, February 3, 2000.
  87. T. Ibukiyama, Modular forms of rational weights and unitary reflection groups, Workshop at RIMS, Finite groups and algebraic combinatorics, January 18, 2000.
  88. T. Ibukiyama, Modular forms of fractional weight, Seminar on number theory and automorphic forms, Osaka University, November 19, 1999.
  89. Tomoyoshi Ibukiyama, On dimensions of modular forms of symmetric tube domains and zeta functions of prehomogeneous vecto spaces, Japan-France seminar on prehomogenous vector space, , November 11, 1999
  90. T. Ibukiyama, Classification and construction of exceptional Lie algebra over algebraic number field. The 7-th Summer School on Number Theory, "Number Theory of Algebraic Groups", July 16, 1999.
  91. T. Ibukiyama, Concrete structres of Siegel modular forms of half-integral weight, The 7-th workshop on algebraic combinatorics, June 25, 1999.
  92. T. Ibukiyama, Classification and construction of exceptional Lie algebras, Preparatory meeting of the 7-th Summer School on number theory, March 9, 1999, Kanazawa Univ.
  93. T. Ibukiyama, Zeta functions of indefinite quadratic forms, Special Lecture on Number Theory, Kyoto University, February 19, 1999.
  94. T. Ibukiyama, Explicit description of zeta functions of indefinite quadratic forms, Conference on algebraic combinatorics and combinatorial theory of quadratic forms, November, 1998, Yamagata Univ.
  95. T. Ibukiyama, Proofs of functional equations of Koecher Maass series and indication to converse theorem, The 1st Hakuba autumn workshop on number theory "Study of Koecher Maass series" September 10, 1998, Hakuba Hightmount Hotel.
  96. T. Ibukiyama, Autumorphic forms of tube domains and symmetric cones,
  97. T. Ibukiyama, On formally real Jordan algebras, The 1st Hakuba autumn workshop on Number Theory "Study of Koecher Maass series", September 10, 1998, Hakuba Highmount Hotel.
  98. T. Ibukiyama, Existence theorem of algebraic curve of genus 3 with maximum numbers of rational points over the finite field Fp2 (p: any odd prime)、 THe 2nd conference on Algebraic Geometry, Number Theory, and Code/Cryptography, July 27, 1998. Univ. Tokyo.
  99. T. Ibukiyama and H. Katsurada, Koecher-Maass Dirichlet series for Eisenstein series of Klingen type, Workshop at RIMS, "Number Theory and Automorphic Forms" January 30, 1998.
  100. T. Ibukiyama, Explicit description of Siegel modular forms of half integral weights and dimension formula, Workshop on pre-homogeneous vector spaces and related topics, Rikkyo University, January 14, 1998.
  101. T. Ibukiyama and F. Onodera, Paramodular forms of level 2, Autumn meeting of Math. Soc. Japan, general talk, October 1, 1997, Univ. Tokyo.
  102. T. Ibukiyama, Proof of Saito-Kurokawa lifting due to Duke-Imamoglu, The 5-th Summer School on Number Theory, July, 1997, Yamanashi Prefecture Seifuso Annex, July 1997
  103. T. Ibukiyama, On Shintani's zeta functions of ternary zero forms (third approach), Workshop at RIMS "Study of prehomogeneous vector spaces", April 1996.
  104. T. Ibukiyama and H. Katsurada, An explicit form of Koecher-Maass Dirichlet series associated with Siegel Eisenstein series, Annual meeting of Math. Soc. Japan, general talk, April 1996, Niigata University
  105. T. Ibukiyama and H. Katsurada, An explicit form of Koecher-Maass Dirichlet series associated with Siegel Eisenstein series, Workshop at RIMS, Automorphic forms on algebraic groups, November 1995
  106. T. Ibukiyama, Dimension formulas of automorphic forms of symmetric domains of type IV, Workshop on automorphic forms on Sp(2;R) and SU(2; 2), January 1995.
  107. T. Ibukiyama, On dimensions of automrophic forms and zeta functions of prehomogeneous vector space, Workshop at RIMS "Study of prehomogeneous vector spaces", October 1994.
  108. T. Ibukiyama, An explicit formula for zeta functions associated with quadratic forms, Workshop at RIMS "Study of prehomogeneous vector spaces", October 1994.
  109. T. Ibukiyama, Around dimension formulas of automorphic forms and zeta functions, The 39-th Symposium on Algebra, July 1994, Ehime University
  110. T. Ibukiyama and H. Saito, On zeta functions associated to symmetric matrices、 Special Lecture in Algebra section of the annual meeting of Math. Soc. Japan, April 1994, Kobe University.
  111. T. Ibukiyama, On some elementary exponential sums, Waseda workshop on number theory, March 1994, Waseda Univ.
  112. T. Ibukiyama and H. Saito, Conjectures on dimensions of Siegel modular forms of degree n, Annual meeting of Math. Soc. Japan, general talk, March 1993, Chuo Univ.
  113. T. Ibukiyama and H. Saito, Explicit forms of Shintani zeta functions, Annual meeting of Japan Math. Soc. general talk, March 1993, Chuo Univ.
  114. T. Ibukiyama, Introduction to quadratic forms (II) (Indefinite quadratic forms and Eisenstein series) , The 1-st Summer School on Number Theory, July 1993, Waseda University Seminar House.
  115. T. Ibukiyama and H. Saito, On zeta functions of symmetric matrices and dimensions of Siegel modular forms, Workshop at RIMS " Study of automorphic forms and L functions", November 1992.
  116. T. Ibukiyama, On differential operators on automrophic forms and invariant pluri-harmonic polynomials, Workshop at RIMS "Study of automorphic forms and related zeta functions" January, 1992.
  117. T. Ibukiyama, An Arithmetic theory of supersingular abelian varieties, Workshop at RIMS "Einstein metric and Yang-Mills connection (The third period of geometry of quaternions)", March 1991.
  118. T. Ibukiyama, Arithmetic theory of supersingular abelian varieties, "Symposium on Algebraic Geometry", Osaka University, March 1991.
  119. T. Ibukiyama, Parahoric subgroups and automorphic forms, Workshop at RIMS "Algebraic groups and related topics" May 1990.
  120. T. Ibukiyama, Supersingular abelian varieties and rational points of algebraic curves, Workshop at RIMS "Number Theory and study related to automorphic forms", December 1989.
  121. T. Ibukiyama, Dimensions of automorphic forms and vanishing of contribution of unipotent conjugacy classes, Workshop at RIMS "Automorphic forms and related topics", January, 1987.
  122. T. Ibukiyama, Jacobi forms and Siegel modular forms of half integral weight, Workshop on Number Theory, Kyushu University, February 1986.
  123. T. Ibukiyama, Automorphism groups of lattices and a generalization of trace formula, Workshop at RIMS, Study of Automorphic representation, November 1985.
  124. T. Ibukiyama and K. Hashimoto, Comparison of dimensions of automorphic forms of Sp(2;R) and Sp(2), Simposium on automorphic forms, RIMS, Kyoto Univ. October 1984.
  125. T. Ibukiyama, Langlands correspondence between automorphic forms, in particular the case of symplectic groups. October 18, 1984, Special Talk at autumn meeting of Math. Soc. Japan, Tokyo University.
  126. T. Ibukiyama, Conjectures on correspondence of symplectic automorphic forms, Autumn meeting of Mathematical Society Japan, general talk, October 8, 1981, Yamaguchi Univ.
  127. T. Ibukiyama, On symplectic Euler factors of genus two, Workshop at RIMS, Kyoto, "Theta functions, Siegel modular forms and related topics", June, 1981.
  128. T. Ibukiyama, On Siegel modular forms, Overall conference, February, 1980, Nagoya University.
  129. T. Ibukiyama and K. Hashimoto, On class numbers of positive definite binary quaternion hermitian forms, The 25-th Symposium on Algebra, August, 1979 at Hokkaido Univ.
  130. T. Ibukiyama, a talk in the annual meeting of MSJ, Spring, 1979(details lost)
  131. T. Ibukiyama, Maximal orders of definite quaternion algebras, April 4, 1978, Annual meeting of Math. Soc. Japan at Nagoya Univ.
  132. T. Ibukiyama, On CM type variety of modular type, April 6, 1977, Spring meeting of Math. Soc. Japan, general talk in Algebra section at Kyoto Univ.
  133. T. Ibukiyama, Formal groups and L functions, Workshop in RIMS, March, 1973.

Organization of meetings

  1. Conference on "Supersingular Abelian Varieties and Related Arithmetics", with Shigeyuki Kondo(Nagoya) and Toshiyuki Katsura(Tokyo), September 30 to October 4, 2019, Nagoya University,
  2. The 20-th Hakuba Number Theory Workshop, "Automorphic differential operators on Siegel modular forms", September 3 to 7, 2017, Hotel Abest Happo Aldea (Hakuba Village, Nagano Prefecture),
  3. JAMI 2017 Conference, Local zeta functions and the arithmetic of moduli spaces: A conference in memory of Jun-Ichi Igusa March 22-26, 2017, Johns Hopkins University, coorganized with Margaret Robinson, David Savitt(USA) and Tatuso Kimura, Tetsuji Shioda(JAPAN), and Program committee: Valery Alexeev, Richard Hain, Francois Loeser.
  4. School on Mock Modular Forms and Related Topics, November 21 to 25, 2016, Kyushu University Industry-University-Government Collaboration Innovation Plaza, (organized with Masanobu Kaneko and Kazuhiro Hikami).
  5. Explicit Theory of Automorphic Forms, March 23, 2014 to March 28, 2014, Shanghai Tongji University, Shanghai (organized with Hongwen Lu, Nils Peter Skoruppa and Haigang Zhou).
  6. International workshop on Mathematics, New Developments in Modern Number Theory and Applied Mathematics & Special Contribution of Students and E-learning, 18 Feb. 2012 -- 22 Feb. 2012, GUtech, Muscut, Oman, (Scientific Committee member), (Main organizer is B. Heim).
  7. The 14-th Autumn Workshop on Number Theory, October 31 to November 5, 2011, Hakuba highmount hotel, Hakuba, Japan, (organized with Takao Watanabe).
  8. The 11-th Autumn Workshop on Number Theory, Hakuba highmount hotel, Hakuba, Japan, September 11 to 15, 2008 (organized with Tamotsu Ikeda)
  9. Oberwolfach Conference, Modul Formen, Mathematisches Forschungsinstitut Oberwolfach, Oberwolfach, Germany, (With Winfried Kohnen and S. Boecherer ) October 29 to November 2, 2007.
  10. The 4-th Spring Conference on modular forms and related topics, "Siegel Modular Forms and Abelian Varieties", February 5-9, 2007, Hotel Curreac, Hamana Lake, Hamamatsu, Japan.
  11. The seventh autumn workshop on number theory, "Differential operators on Siegel modular forms and application", October 24--30, 2004. Hakuba Highmount Hotel, Hakuba, Japan.
  12. Automorphic Forms and Zeta Functions, in Memory of Tsuneo Arakawa, organized by S. Boecherer, T. Ibukiyama, M. Kaneko, F. Sato, September 4-7, 2004, Rikkyo Univ. Tokyo, Japan.
  13. The third Spring conference on modular forms and related topics, 2004.2.16 -- 2004.2.20, Organizers: T. Ibukiyama(Main organizer), K. Saito, E. Bannai, M. Miyamoto, Hotel Curreac, Hamana-Lake, Hamamatsu, Japan.
  14. Mini-conference on Number Theory, April 17 to 18, 2003, Osaka University, Japan.
  15. The 2nd Spring conference on automorphic forms and related areas, February 15 to 19, Curreac Hamana Lake, Hamamatsu, Japan, (Main organizer with co-organizers Eiichi Bannai, Masahiko Miyamoto, Kyoji Saito）
  16. Oberwolfach Conference, September 15 to 21, 2002, Mathematisches Forshungsinstitut Oberwolfach, Overwolfach, Germany, （cochairman with Siegfried Boecherer, Winfried Kohnen)
  17. The 1st Spring conference on automorphic forms and related areas, "Rings of modular forms" February 16 to 20, 2002, Curreac Hamana Lake, Hamamatsu, Japan, (Main organizer with co-organizers Eiichi Bannai, Masahiko Miyamoto, Kyoji Saito).
  18. Japan German seminar supported by JSPS (The 4-th Autumn Workshop on Number Theory) September 9 to 15, 2001, Hakuba highmount hotel (coorganizer with W. Kohnen), Hakuba, Japan.
  19. Mini-conference on number theory, January 30 to 31, 2001, Osaka University, Japan, (cochairman with Takao Watanabe)
  20. The 3rd Autumn Workshop on Number Theory, "Dimension formulas of automorphic forms" September 9 to 13, 2000, Hakuba highmount hotel, Hakuba, Japan.
  21. Mini conference on automorphic forms, February 2 to 3, 2000, Osaka University, Japan.
  22. The 2nd Autumn Workshop on Number Theory, "Eisenstein series", September 10 to 14, 1999, Hakuba highmount hotel, Hakuba, Japan.
  23. Oberwolfach conference, Modulformen mehrerer variablen. Mathematisches Forschungsinstitut Oberwolfach, Oberwolfach, Germany, December 6 to 11, 1998 (cochairman with W. Kohnen and S. Boecherer)
  24. The 1st Autumn Workshop on Number Theory, "Koecher Maass series", Hakuba highmount hotel, Hakuba, Japan, September 10 to 14, 1998.
  25. Conference on Modular forms and Modular Varieties, Osaka University, Japan January 22 to 24, 1996.
  26. The 1st Summer School on Number Theory, "Eisenstein series", Seminar House of Waseda University, Shinano-Oiwake, Japan, July 18 to 21, 1993
  27. RIMS workshop, "Study of Automorphic forms and L functions", RIMS, Kyoto Univ. Japan, November 16 to 20, 1992
  28. Conference on Geometry and Automorphic Forms, February 22 to 26, 1988, Tohoku Univ. Japan

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