Symposia (open)
Intelligence of Low-dimensional Topology
Location:
Online via Zoom
Period:
2021-05-19--2021-05-21
Organizer:
OHTSUKI Tomotada(RIMS, Kyoto University)
New developments of transformation groups
Location:
Online via Zoom
Period:
2021-05-24--2021-05-26
Organizer:
KAWAKAMI Tomohiro(Faculty of Education, Wakayama University)
Postponed (new date:TBA)
Regularity and asymptotic analysis for critical case of partial differential equations
Regularity and asymptotic analysis for critical case of partial differential equations
Location:
Rm 420
Period:
2021-05-26--2021-05-28
Organizer:
OGAWA Takayoshi(Gradute Scrhool of Science/RacMAS, Tohoku University)
Geometry of discrete groups and hyperbolic spaces
Location:
Online via Zoom
Period:
2021-05-31--2021-06-04
Organizer:
FUJII Michihiko(Faculty of Science, University of the Ryukyus)
Research Trends on General Topology and its Related Fields
Location:
Online via Zoom
Period:
2021-06-02--2021-06-04
Organizer:
IMAMURA Hayato(Waseda Research Institute for Science and Engineering, Waseda University)
[Canceled]
Workshop on von Neumann algebras and related topics
Workshop on von Neumann algebras and related topics
Location:
Rm 420
Period:
2021-06-14--2021-06-18
Organizer:
OZAWA Narutaka(RIMS, Kyoto University)
Deepening and merging geometric structures related to submanifold theory
Location:
Online via Zoom
Period:
2021-06-21--2021-06-23
Organizer:
NAKATA Fuminori(Faculty of Human Development and Culture, Fukushima University)
Biofluids Symposium
Location:
Online via Zoom
Period:
2021-06-21--2021-06-24
Organizer:
IIMA Makoto(Graduate School of Integrated Sciences for Life, Hiroshima University)
Recent Developments in Dynamical Systems and their Applications
Location:
Online via Zoom
Period:
2021-06-21--2021-06-25
Organizer:
SHIBAYAMA Mitsuru(Graduate School of Informatics, Kyoto University)
Higher-dimensional algebraic varieties
Location:
Online via Zoom
Period:
2021-06-22--2021-06-24
Organizer:
FUJINO Osamu(Graduate School of Science, Kyoto University)
Geometric Aspects of Solutions to Partial Differential Equations
Location:
Online via Zoom
Period:
2021-06-28--2021-06-30
Organizer:
KOHSAKA Yoshihito(Maritime Sciences, Kobe University)
Foundations and Perspectives of Anabelian Geometry
Location:
Online via Zoom
Period:
2021-06-28--2021-07-02
Organizer:
FESENKO Ivan(School of Mathematical Sciences, University of Nottingham)
Harmonic Analysis and Nonlinear Partial Differential Equations
Location:
Online via Zoom
Period:
2021-07-05--2021-07-07
Organizer:
MASAKI Satoshi(Department of Engineering Science, Osaka University)
Mathematical Analysis in Fluid and Gas Dynamics
Location:
Online via Zoom
Period:
2021-07-07--2021-07-09
Organizer:
SUZUKI Masahiro(Graduate School of Engineering, Nagoya Institute of Technology)
[Canceled]
The Second Australia-China-Japan-Singapore-U.S. Index Theory Conference—Noncommutative Geometry and K-Theory
The Second Australia-China-Japan-Singapore-U.S. Index Theory Conference—Noncommutative Geometry and K-Theory
Location:
Rm 420
Period:
2021-07-19--2021-07-23
Organizer:
KAWAHIGASHI Yasuyuki(Graduate School of Mathematical Sciences, The University of Tokyo)
Postponed (new date:TBA)
Global nature of turbulence
Global nature of turbulence
Location:
Rm 111
Period:
2021-07-28--2021-07-30
Organizer:
TOH Sadayoshi(Faculty of Science, Kyoto University)
Lie Theory, representation theory and related areas
Location:
Online via Zoom
Period:
2021-08-10--2021-08-12
Organizer:
OKUDA Takayuki(Graduate School of Advanced Science and Engineering, Hiroshima University)
Advances in the theory and application of mathematical optimization
Location:
Online via Zoom
Period:
2021-08-19--2021-08-19
Organizer:
GOTOH Jun-ya(Faculty of Science and Engineering, Chuo University)
Various aspects of integrable systems
Location:
Online via Zoom
Period:
2021-08-25--2021-08-27
Organizer:
MAEDA Kazuki(Faculty of Informatics, The University of Fukuchiyama)
Study of Mathematical Software and Its Effective Use for Mathematics Education
Location:
Online via Zoom
Period:
2021-08-26--2021-08-28
Organizer:
KANEKO Masataka(Faculty of pharmaceutical sciences, Toho University)
Integrated Research on Random Dynamical Systems and Multi-Valued Dynamical Systems
Location:
Online via Zoom
Period:
2021-08-30--2021-09-03
Organizer:
SUMI Hiroki(Graduate School of Human and Environmental Studies, Kyoto University)
[Canceled]
Analysis, Geometry and Stochastics on Metric Spaces
Analysis, Geometry and Stochastics on Metric Spaces
Location:
Maskawa Building for Education and Research
Period:
2021-09-06--2021-09-08
Organizer:
TUSCHMANN Wilderich(Faculty of Mathematics, Karlsruhe Institute of Technology)
Open problems in complex geometry II
Location:
Online via Zoom
Period:
2021-09-06--2021-09-09
Organizer:
TAKAYAMA Shigeharu(Graduate School of Mathematical Sciences, The University of Tokyo)
International Conference on Stochastic Analysis and its Applications
Location:
Online via Zoom
Period:
2021-09-06--2021-09-10
Organizer:
HINO Masanori(Graduate School of Science, Kyoto University)
Financial Modeling and Analysis
Location:
Online via Zoom
Period:
2021-09-08--2021-09-10
Organizer:
TSUJIMURA Motoh(Graduate School of Commerce, Doshisha University)
Study of History of Mathematics
Location:
Online via Zoom
Period:
2021-09-13--2021-09-16
Organizer:
OSADA Naoki(Tokyo Woman's Christian University)
Workshop on C*-algebras and related topics
Location:
Online via Zoom
Period:
2021-09-27--2021-09-28
Organizer:
OZAWA Narutaka(RIMS, Kyoto University)
Diversity of the theory of evolution equation -- from theory to application
Location:
Online via Zoom
Period:
2021-10-06--2021-10-08
Organizer:
ISHIWATA Michinori(Graduate School of Engineering Science, Osaka University)
Exact WKB Analysis, Microlocal Analysis, Painlevé Equations and Related Topics
Location:
Online via Zoom
Period:
2021-10-11--2021-10-15
Organizer:
IWAKI Kohei(Graduate School of Mathematical Sciences, The University of Tokyo)
Analytic Number Theory and Related Topics
Location:
Online via Zoom
Period:
2021-10-12--2021-10-15
Organizer:
AKATSUKA Hirotaka(Faculty of Commerce, Otaru University of Commerce)
Recent Developments in Set Theory of the Reals
Location:
Online via Zoom
Period:
2021-10-12--2021-10-15
Organizer:
KADA Masaru(Graduate School of Science, Osaka Prefecture University)
[Canceled]
Mathematical aspects of nonlinear waves and their applications
Mathematical aspects of nonlinear waves and their applications
Location:
Maskawa Building for Education and Research
Period:
2021-10-13--2021-10-15
Organizer:
KYOTOH Harumichi(Faculty of Engineering, University of Tsukuba)
Modeling and Mathematical Analysis of Dynamics of Patterns
Location:
Online via Zoom
Period:
2021-10-18--2021-10-20
Organizer:
MONOBE Harunori(RIIS, Okayama University)
Combinatorial Representation Theory and Connections with Related Fields
Location:
Online via Zoom
Period:
2021-10-18--2021-10-22
Organizer:
MOTEGI Kohei(Faculty of Marine Technology, Tokyo University of Marine Science and Technology)
Research on preserver problems on Banach algebras and related topics
Location:
Online via Zoom
Period:
2021-10-25--2021-10-27
Organizer:
OI Shiho( Faculty of Science, Niigata University)
[Canceled]
Workshop for Industrial and Applied Mathematics
Workshop for Industrial and Applied Mathematics
Location:
Waseda University Ono Auditorium
Period:
2021-10-28--2021-10-30
Organizer:
OKAMOTO Hisashi(Faculty of Science, Gakushuin University)
Qualitative Theory on ODEs and its Applications
Location:
Online via Zoom
Period:
2021-11-10--2021-11-12
Organizer:
NAITO Yukii(Department of Mathematics, Hiroshima University)
New Developments on Mathematical Decision Making Under Uncertainty
Location:
Online via Zoom
Period:
2021-11-15--2021-11-16
Organizer:
INOUE Shinji( Faculty of Informatics, Kansai University)
Rigorous statistical mechanics and related topics
Location:
Online via Zoom
Period:
2021-11-16--2021-11-19
Organizer:
SASAMOTO Tomohiro(School of Science, Tokyo Institute of Technology)
Time-delay systems and mathematical sciences: new developments of theory and applications
Location:
Online via Zoom (partially hybrid)
Period:
2021-11-17--2021-11-19
Organizer:
NAKATA Yukihiko ( College of Science and Engineering, Aoyama Gakuin University)
Singularity theory of smooth maps and its applications
Location:
Online via Zoom
Period:
2021-11-29--2021-12-01
Organizer:
SAJI Kentaro(Graduate School of Science, Kobe University)
Arithmetic algebraic geometry and mathematical physics
Location:
Online via Zoom (partially hybrid)
Period:
2021-11-29--2021-12-03
Organizer:
NAMIKAWA Yoshinori(RIMS, Kyoto University)
Spectral and Scattering Theory and Related Topics
Location:
Online via Zoom
Period:
2021-12-01--2021-12-03
Organizer:
ANDO Kazunori(Graduated School of Science and Engineering, Ehime University)
Mathematical Analysis of Viscous Incompressible Fluid
Location:
Online via Zoom
Period:
2021-12-06--2021-12-08
Organizer:
MAEKAWA Yasunori(Graduate School of Science, Kyoto University)
Mathematical Aspects of Quantum Fields and Related Topics
Location:
Online via Zoom
Period:
2021-12-06--2021-12-08
Organizer:
HIROSHIMA Fumio (Faculty of Mathematics, Kyushu University)
Research on number theory in Asia - Pan Asian Number conference 2021-Kyoto
Location:
Online via Zoom
Period:
2021-12-06--2021-12-10
Organizer:
IKEDA Tamotsu(Graduate School of Science, Kyoto University)
Study on Nonlinear Analysis and Convex Analysis
Location:
Online via Zoom
Period:
2021-12-08--2021-12-10
Organizer:
HOSHINO Mitsuhiro(Faculty of Systems Science and Technology, Akita Prefectural University)
Model theoretic aspects of the notion of independence and dimension
Location:
Online via Zoom
Period:
2021-12-13--2021-12-15
Organizer:
KIKYO Hirotaka(Graduate School of System Informatics, Kobe University)
Algebraic Number Theory and Related Topics
Location:
Hybrid Meeting
Period:
2021-12-13--2021-12-17
Organizer:
KOBAYASHI Shinichi(Faculty of Mathematics, Kyushu University)
Aspects of Complex Dynamics
Location:
Online via Zoom
Period:
2021-12-13--2021-12-17
Organizer:
KAWAHIRA Tomoki(Graduate School of Economics, Hitotsubashi University)
Theory and Applications of Proof and Computation
Location:
Hybrid Meeting
Period:
2021-12-20--2021-12-22
Organizer:
IKEDA Kazuma(Faculty of Health Sciences, Kyorin University)
Computer Algebra-Foundations and Applications
Location:
Online via Zoom
Period:
2021-12-20--2021-12-22
Organizer:
KITAMOTO Takuya( Faculty of Education, Yamaguchi University)
[Canceled]
Operator means and related topics
Operator means and related topics
Location:
Rm 111
Period:
2022-01-05--2022-01-07
Organizer:
YANAGIDA Masahiro(Faculty of Science, Tokyo University of Science)
Theory and practice in inverse problem
Location:
Hybrid Meeting
Period:
2022-01-05--2022-01-07
Organizer:
ITO Hiroya(Graduate School of Informatics and Engineering, The University of Electro-Communications)
Workshop on free probability and related topics
Location:
Hybrid Meeting
Period:
2022-01-13--2022-01-14
Organizer:
COLLINS Benoit(Graduate School of Science, Kyoto University)
Automorphic form, automorphic L-functions and related topics
Location:
Online via Zoom
Period:
2022-01-24--2022-01-28
Organizer:
MORIMOTO Kazuki( Graduate School of Science, Kobe University)
Foundations of Computer Science Supporting the Information Society
Location:
Hybrid Meeting
Period:
2022-02-01--2022-02-03
Organizer:
KIJIMA Shuji(Faculty of Information Science and Electrical Engineering, Kyushu University)
[Canceled]
Numerical Analysis Leading Next Generation Information Society - From Edge to Fugaku -
Numerical Analysis Leading Next Generation Information Society - From Edge to Fugaku -
Location:
Rm 201,Research Building No.15
Period:
2022-02-14--2022-02-16
Organizer:
SUDA Reiji(Graduate School of Information Science and Technology, The University of Tokyo)
Logic, Algebraic system, Language and Related Areas in Computer Science
Location:
Online via Zoom
Period:
2022-02-16--2022-02-18
Organizer:
IWAMI Munehiro(Interdisciplinary Faculty of Science and Engineering, Shimane University)
Cohomology theory of finite groups and related topics
Location:
Online via Zoom
Period:
2022-02-16--2022-02-18
Organizer:
HIDA Akihiko(Faculty of Education, Saitama University)
Geometry of Submanifolds and Integrable Systems
Location:
Hybrid Meeting
Period:
2022-02-20--2022-02-23
Organizer:
OHNITA Yoshihiro(OCAMI, Osaka City University)
[Canceled]
Theory of function spaces and related topics
Theory of function spaces and related topics
Location:
Rm 420
Period:
2022-02-28--2022-03-02
Organizer:
OHWADA Tomoyoshi(Faculty of Education, Shizuoka University)
Differential Geometry and Integrable Systems(MSJ-SI)
Location:
Osaka City University
Period:
2022-03-01--2022-03-21
Organizer:
OHNITA Yoshihiro(OCAMI, Osaka City University)
[Canceled]
Aspects of Educational Mathematics -- Diversity and universality in higer education of mathematics -- (II)
Aspects of Educational Mathematics -- Diversity and universality in higer education of mathematics -- (II)
Location:
Rm 420
Period:
2022-03-07--2022-03-10
Organizer:
SHIMIZU Yuji (College of Liberal Arts, International Christian University)
Geometric Structures and Differential Equations ― Symmetry, Singularity, and Quantization ―
Period:
2022-03-14--2022-03-18
Organizer:
TARAMA Daisuke(College of Science and Engineering, Ritsumeikan University)
Japanese-European Symposium on Symplectic Varieties and Moduli Space
Location:
Waseda University
Period:
2022-03-14--2022-03-18
Organizer:
MATSUSHITA Daisuke(Faculty of Science, Hokkaido University)
[Canceled]
Characteristic Polynomials of Hyperplane Arrangements and Ehrhart Polynomials of Convex Polytopes
Characteristic Polynomials of Hyperplane Arrangements and Ehrhart Polynomials of Convex Polytopes
Location:
Rm 420
Period:
2022-03-28--2022-03-31
Organizer:
NAKASHIMA Norihiro(Faculty of Engineering, Nagoya Institute of Technology)
Workshops (Type A)
[Canceled]
Computability, Algebraic Structures, and Algorithmic Randomness
Computability, Algebraic Structures, and Algorithmic Randomness
Location:
Rm 420
Period:
2021-04-19--2021-04-23
Organizer:
KHOUSSAINOV Bakh(AffiliationComputer Science Dept, The University of Auckland)
Recent progress on researches of the linear and non-linear dispersive equations
Location:
Online via Zoom
Period:
2021-05-17--2021-05-20
Organizer:
URIYA Kota(Faculty of Science, Okayama University of Science)
Mathematics of quantum walks in finite graphs and quantum algorithm
Location:
Online via Zoom
Period:
2021-06-14--2021-06-16
Organizer:
FUNAKAWA Daiju(Faculty of Engineering, Hokkai Gakuen University)
Mathematical geographical modelling for environmental humanities
Location:
Online via Zoom
Period:
2021-06-24--2021-06-25
Organizer:
FUJIWARA Naoya( Graduate School of Information Sciences, Tohoku University)
Fluid mechanics in ecology and evolution
Location:
Online via Zoom
Period:
2021-07-05--2021-07-07
Organizer:
YAMAMICHI Masato (The University of Queensland)
Combinatorial Anabelian Geometry and Related Topics
Location:
Online via Zoom
Period:
2021-07-05--2021-07-09
Organizer:
HOSHI Yuichiro(RIMS, Kyoto University)
Studies on Mathematical Mechanobiology 2021
Location:
Online via Zoom
Period:
2021-07-14--2021-07-16
Organizer:
HIRASHIMA Tsuyoshi(The Hakubi Center/Graduate School of Biostudies, Kyoto University)
Biofluid Mehanics of Reproduction
Location:
Online via Zoom
Period:
2021-07-29--2021-07-30
Organizer:
Lisa J. Fauci(Tulane University)
Seminar on Combinatorial Optimization
Location:
Online via Zoom
Period:
2021-08-04--2021-08-06
Organizer:
MAKINO Kazuhisa(RIMS, Kyoto University)
Mathematical methods for the studies of flow, shape, and dynamics
Location:
Online via Zoom
Period:
2021-08-30--2021-08-31
Organizer:
ISHIMOTO Kenta(RIMS, Kyoto University)
Invitation to inter-universal Teichmüller Theory
Location:
Online via Zoom
Period:
2021-08-31--2021-09-03
Organizer:
HOSHI Yuichiro(RIMS, Kyoto University)
Inter-universal Teichmüller Theory Summit 2021
Location:
Online via Zoom
Period:
2021-09-07--2021-09-10
Organizer:
HOSHI Yuichiro(RIMS, Kyoto University)
Mathematics of quasiperiodic order and related topics
Location:
Hybrid Meeting
Period:
2021-11-08--2021-11-10
Organizer:
YAMAGISHI Yoshikazu(Faculty of advanced science and technology, Ryukoku University)
Scattering theory and microlocal analysis for time-dependent Hamiltonian
Location:
Hybrid Meeting
Period:
2021-11-08--2021-11-10
Organizer:
YONEYAMA Taisuke( College of Arts and Sciences, Kitasato University)
Symmetry and amenability in operator algebras
Location:
Hybrid Meeting
Period:
2022-01-24--2022-01-26
Organizer:
NAWATA Norio(Graduate School of Information Science and Technology, Osaka University)
Theoretical and numerical research on iterative methods for free boundary problems
Location:
Online via Zoom
Period:
2022-01-31--2022-02-02
Organizer:
TSUCHIYA Takuya(Graduated School of Science and Engineering, Ehime University)
Recent Progress in Ergodic Theory
Location:
Hybrid Meeting
Period:
2022-02-16--2022-02-18
Organizer:
NATSUI Rie(Faculty of Science, Japan Women’s University)
Effect of local structures of graphs on graph invariants
Location:
Hybrid Meeting
Period:
2022-02-28--2022-03-04
Organizer:
FURUYA Michitaka(College of Liberal Arts and Sciences, Kitasato University)
Bayesian approaches and statistical inference
Location:
Online via Zoom
Period:
2022-03-07--2022-03-09
Organizer:
KOIKE Ken-ichi(College of Commerce, Nihon University)
Accurate analysis of nonlinear problems
Location:
Online via Zoom
Period:
2022-03-07--2022-03-09
Organizer:
TANAKA Satoshi(Faculty of Science, Tohoku University)
Workshops (Type A) - Tandem-workshop 2021 at MFO and RIMS -
Symmetries on polynomial ideals and varieties
Location:
Online via Zoom
Period:
2021-09-06--2021-09-10
| Organizer: | MURAI Satoshi (Faculty of Education and Integrated Arts and Sciences, Waseda University) |
| CORDIAN Riener (University of Tromsø) |
Nonlocality in Analysis, Probability and Statistics – NAPS
Location:
Rm 111
Period:
2022-03-21--2022-03-25
| Organizer: | KOHATSU-HIGA Arturo (College of Science and Engineering, Ritsumeikan University) |
| BOGDAN Krzysztof (TU Wrocław) | |
| ROS-OTON Xavier (Barcelona U) | |
| SCHILLING René (Technische Universität Dresden) |
Workshops (Type B)
Postponed (new date:TBA)
Turbulent mixing in magnetohydrodynamics
Turbulent mixing in magnetohydrodynamics
Location:
Rm 110
Period:
2021-09-13--2021-09-17
Organizer:
MATSUMOTO Takeshi(Graduate School of Science, Kyoto University)
Statistical Nature of Hall MHD Turbulence
Location:
Online via Zoom
Period:
2021-11-30--2021-12-07
Organizer:
MATSUMOTO Takeshi(Graduate School of Science, Kyoto University)
Workshops (Type C)
Satellite Seminars
[Canceled]
Applications of Harmonic Maps and Higgs Bundles to Differential Geometry
Applications of Harmonic Maps and Higgs Bundles to Differential Geometry
Location:
Seapal Suma
Period:
2021-07-05--2021-07-08
Organizer:
PEDIT Franz(University of Massachusetts Amherst)
[Canceled]
Homogenization and/or non local operators
Homogenization and/or non local operators
Location:
Toyoko Inn Hokkaido Sapporo-eki Kita-guchi
Period:
2021-09-13--2021-09-17
Organizer:
MASAMUNE Jun(Faculty of Science, Hokkaido University)
Interactions of new trends in Algebraic Geometry and Singularities
Location:
Online via Zoom
Period:
2021-10-11--2021-10-15
Organizer:
KAWANOUE Hiraku(College of Engineering/Academy of Emerging Sciences, Chubu University)
[Canceled]
The hypoelliptic Laplacian and tempered unitary representations
The hypoelliptic Laplacian and tempered unitary representations
Location:
Nara Prefectural Convention Center
Period:
2021-11-22--2021-11-26
Organizer:
KATO Tsuyoshi(Graduate School of Science, Kyoto University)
[Canceled]
Kyoto-CAU Joint Meeting on Nonlinear PDEs
Kyoto-CAU Joint Meeting on Nonlinear PDEs
Location:
Hotel Kanazawa Kenrokusou
Period:
2022-03-21--2022-03-22
Organizer:
NAKANISHI Kenji(RIMS, Kyoto University)
[Canceled]
Mathematical modelling of turbulent flows in astrophysical and geophysical phenomena
Mathematical modelling of turbulent flows in astrophysical and geophysical phenomena
Location:
Kansai Seminar House
Period:
2022-03-23--2022-03-26
Organizer:
TOBIAS Steven(Department of Applied Mathematics, University of Leeds)
Review Seminars
Lectures on patterns and dynamics in biology: From basics to recent advances
Location:
Online via Zoom
Period:
2021-06-15--2021-06-18
Organizer:
ISHIMOTO Kenta(RIMS, Kyoto University)
[Canceled]
Randomness and Data Structures
Randomness and Data Structures
Location:
Rm 111
Period:
2021-08-02--2021-08-06
Organizer:
CHENG Siu-Wing(Hong Kong University of Science and Technology)
Algebraic Combinatorics
Location:
Online via Zoom
Period:
2021-10-04--2021-10-08
Organizer:
KIRILLOV Anatoli(RIMS, Kyoto University)
Generalized Hitchin Systems, Non-commutative Geometry and Special Functions
Location:
Online via Zoom
Period:
2021-11-16--2021-11-25
Organizer:
OHNITA Yoshihiro(OCAMI, Osaka City University)
Special Geometry, Mirror Symmetry and Integrable Systems
Location:
Online via Zoom
Period:
2021-11-29--2021-12-02
Organizer:
OHNITA Yoshihiro(OCAMI, Osaka City University)
[Canceled]
Fluid Dynamics of superrotation phenomena observed in the atmospheres of slowly rotating planets（FDEPS 2021）
Fluid Dynamics of superrotation phenomena observed in the atmospheres of slowly rotating planets（FDEPS 2021）
Location:
Kansai Seminar House
Period:
2021-11-30--2021-12-03
Organizer:
HAYASHI Shosuke(Graduate School of Science, Kobe University)
Symmetry and Stability in Differential Geometry of Surfaces
Location:
Nagoya University
Period:
2022-02-14--2022-02-16
Organizer:
OHNITA Yoshihiro(OCAMI, Osaka City University)
Long-term Visiting Researchers
Postponed (new date:TBA)
From elliptic operators to sub-elliptic operators
From elliptic operators to sub-elliptic operators
Location:
Period:
2021-09-06--2021-09-22
Organizer:
FURUTANI Kenro(Advanced mathematical institute, Osaka City University)
