Colloquium/Seminars

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Colloquium

Title

See the Japanese page

Date

2016.1.6 (Wed) 15:30~16:30 (16:30- tea)

Place

Rm110, Research Institute for Mathematical Sciences, Kyoto University

Speaker

Yasutaka Shimizu (Waseda University)

Comment

Title

See the Japanese page

Date

2016.1.6 (Wed) 17:00~18:00 (16:30- tea)

Place

Rm110, Research Institute for Mathematical Sciences, Kyoto University

Speaker

Takuya Sakasai (The University of Tokyo)

Comment

Title

See the Japanese page

Date

2015.12.16 (Wed) 15:20~16:20

Place

Rm110, Building No.3, Faculty of Science, Kyoto University

Speaker

Kenji Fukaya (Stony Brook University)

Comment 16:20-17:00 Tea Break (Rm109)

Title

See the Japanese page

Date

2015.12.16 (Wed) 17:00~18:00

Place

Rm110, Building No.3, Faculty of Science, Kyoto University

Speaker

Takeshi Torii (Okayama University)

Comment 16:20-17:00 Tea Break (Rm109)

Title

Finite multiple zeta values

Date

2015.12.9 (Wed) 16:30~17:30    (16:00- tea)

Place

Rm110, Research Institute for Mathematical Sciences, Kyoto University

Speaker

Masanobu Kaneko (Kyushu University)

Abstract

We discuss two very different “finite” versions of the classical multiple zeta values. After giving some basics, we present a conjectural isomorphism of the two rings of finite multiple zeta values and give some results which support our conjecture. This is a joint work with Don Zagier.

Comment

Title

See the Japanese page

Date

2015.12.2 (Tue) 15:30~16:30 (15:00- tea)

Place

Rm110, Building No.3, Faculty of Science, Kyoto University

Speaker

Yoshihiro Sawano (Tokyo Metropolitan University)

Comment

Title

See the Japanese page

Date

2015.12.2 (Wed) 16:45~17:45 (15:00- tea)

Place

Rm110, Building No.3, Faculty of Science, Kyoto University

Speaker

Kazuo Akutagawa (Tokyo Institute of Technology)

Comment

Title

Distinguished automorphic spectrum of unitary groups

Date

2015.11.18 (Wed) 16:30~17:30    (16:00- tea)

Place

Rm110, Research Institute for Mathematical Sciences, Kyoto University

Speaker

Masao Tsuzuki (Sophia University)

Comment

Title

See the Japanese page

Date

2015.11.11 (Wed) 16:30~17:30    (16:00- tea)

Place

Rm110, Research Institute for Mathematical Sciences, Kyoto University

Speaker

Kotaro Tsugawa (Nagoya University)

Comment

Title

See the Japanese page

Date

2015.11.4 (Wed) 16:30~17:30    (16:00- tea)

Place

Rm110, Research Institute for Mathematical Sciences, Kyoto University

Speaker

Daisuke Furihata (Osaka University)

Comment

Title

Randomness-induced phenomena and negativity of generic random dynamical systems of complex polynomials

Date

2015.10.28 (Wed) 16:30~17:30    (16:00- tea)

Place

Rm110, Building No.3, Faculty of Science, Kyoto University

Speaker

Hiroki Sumi (Osaka University)

Abstract

We consider random dynamical systems of complex polynomial maps on the Riemann sphere. In the usual iteration dynamical system of a single rational map of degree two or more, we have a kind of chaos in the Julia set and the Hausdorff dimension of the set of initial values whose Lyapunov exponent is negative, is positive. However, in this talk, we show that for a generic random dynamical systems of complex polynomials, for all but countable initial values $z$, for almost every sequence of polynomials, the Lyapunov exponent is negative and the chaoticity of the averaged system is much weaker than usual iteration dynamical system. There are many new phenomena in random dynamical systems which cannot hold in the usual iteration dynamical systems. We call such phenomena "randomness-induced phenomena". We investigate the mechanisms and background of these phenomena.

Comment

Title

"The Hole Story": how to solve problems in multiply connected domains

Date

2015.10.21 (Wed) 16:30~17:30    (16:00- tea)

Place

Rm110, Building No.3, Faculty of Science, Kyoto University

Speaker

Darren Crowdy (Imperial College London)

Abstract

This talk will survey recent developments in providing novel constructive methods for the solution of boundary value problems in multiply connected, or "holey", planar domains. All the investigations are driven by problems arising in applications and examples will be given. Two distinct mathematical approaches will be described: one based on special function theory, and another centred around generalized transform methods. The setting for the special function theory approach tackles the problems on a compact Riemann surface naturally associated to any planar multiply connected domain known as the Schottky double, and makes use of the Schottky-Klein prime function associated therewith. On the other hand, our new transform approach for multiply connected domains generalizes and combines classical transform ideas of Fourier and Mellin with more recent developments pioneered by A. S. Fokas and collaborators.

Comment

Title

The generalized principal eigenvalue for viscous Hamilton-Jacobi equations and stochastic optimal control

Date

2015.10.14 (Wed) 16:30~17:30    (16:00- tea)

Place

Rm110, Building No.3, Faculty of Science, Kyoto University

Speaker

Naoyuki Ichihara (Aoyama Gakuin University)

Comment

Title

On regularity of axially symmetric Navier-Stokes flows

Date

2015.10.7 (Wed) 16:30~17:30 (16:00- tea)

Place

Rm110, Building No.3, Faculty of Science, Kyoto University

Speaker

Ken Abe (Kyoto University)

Comment

Title

Geometry of Quantum Information via Holographic Principle

Date

2015.7.15 (Wed) 16:30~17:30    (16:00- tea)

Place

Rm110, Building No.3, Faculty of Science, Kyoto University

Speaker

Tadashi Takayanagi (Kyoto University)

Comment

Title

Hydrodynamics of swimming microorganisms and its application to biology of reproduction

Date

2015.7.8 (Wed) 16:30~17:30    (16:00- tea)

Place

Rm110, Research Institute for Mathematical Sciences, Kyoto University

Speaker

Kenta Ishimoto (RIMS, Kyoto University)

Comment

Title

On invariants related to the Chern-Simons perturbation theory

Date

2015.7.1 (Wed) 16:30~17:30    (16:00- tea)

Place

Rm110, Research Institute for Mathematical Sciences, Kyoto University

Speaker

Tatsuro Shimizu (RIMS, Kyoto University)

Comment

Title

Mathematics in Simulations of Musical Instruments

Date

2015.6.24 (Wed) 15:00~16:00 (16:00- tea)

Place

Rm127, Building No.3, Faculty of Science, Kyoto University

Speaker

Takaharu Yaguchi (Kobe University)

Abstract

Much attention has recently been paid to musical sound synthesis using partial differential equation models. Compared to the conventional signal-processing approach, the parameters in the PDE models have physical interpretation. This enables appropriate parameter fitting and the design of more realistic models. The research on this approach is still at the beginning and there remain many interesting mathematical problems. In this talk, recent developments on piano simulations are exemplarily presented. Some mathematical challenges are also shown.

Comment

Title

On automorphisms of Enriques surfaces

Date

2015.6.24 (Wed) 16:30~17:30    (16:00- tea)

Place

Rm127, Building No.3, Faculty of Science, Kyoto University

Speaker

Hisanori Ohashi (Tokyo University of Science)

Comment

Title

Can a computer be a mathematician?

Date

2015.6.17 (Wed) 15:00~16:00

Place

Rm420, Research Institute for Mathematical Sciences, Kyoto University

Speaker

Kazushige Terui (RIMS, Kyoto University)

Comment 16:00-16:30 Tea Break (Rm110)

Title

Geometry of contracting geodesics

Date

2015.6.17 (Wed) 16:30~17:30   

Place

Rm420, Research Institute for Mathematical Sciences, Kyoto University

Speaker

Koji Fujiwara (Kyoto University)

Comment 16:00-16:30 Tea Break (Rm110)

Title

The Fourier Transform and the Calculus of Residues

Date

2015.6.10 (Wed) 16:30~17:30    (16:00- tea)

Place

Rm110, Research Institute for Mathematical Sciences, Kyoto University

Speaker

Machiel van Frankenhuijsen (RIMS & Utah Valley University)

Abstract

The introduction of Fourier analysis in number theory dates back to Tate's thesis and at the time greatly clarified the functional equation of L-series. For global function fields, the local characters seem to be given by a residue. Lifting to characteristic zero, we will see that this is indeed the case. Back to number theory, we will give some speculations how the characters, as originally defined by Tate in an ad hoc manner, could be viewed as residues as well.

Comment

Title

Periods of residual automorphic forms

Date

2015.6.3 (Wed) 16:30~17:30    (16:00- tea)

Place

Rm110, Building No.3, Faculty of Science, Kyoto University

Speaker

Shunsuke Yamana (Kyoto University)

Comment

Title

On the exact WKB analysis for holonomic systems --- present and prospect

Date

2015.5.27 (Wed) 16:30~17:30 (16:00- tea)

Place

Rm110, Research Institute for Mathematical Sciences, Kyoto University

Speaker

Yoshitsugu Takei (RIMS, Kyoto University)

Comment

Title

Mathematical analysis of moving free boundaries

Date

2015.5.20 (Wed) 16:30~17:30    (16:00- tea)

Place

Rm110, Building No.3, Faculty of Science, Kyoto University

Speaker

Karel Svadlenka (Kyoto University)

Comment

Title

The Cremona group

Date

2015.5.13 (Wed) 16:30~17:30 (16:00- tea)

Place

Rm110, Research Institute for Mathematical Sciences, Kyoto University

Speaker

Igor Dolgachev (University of Michigan)

Abstract

The Cremona group in dimension n is the group of automorphisms of the field or rational function in n variables with coefficients in a field K. In geometric language, it is the group of birational transformations of the projective n-dimensional projective space over K. I will report on the recent progress in the study of this group based on the techniques of hyperbolic geometry and the theory of complex dynamical systems.

Comment

Title

Growth rate of the number of periodic points for generic dynamical systems

Date

2015.4.22 (Wed) 16:30~17:30    (16:00- tea)

Place

Rm110, Building No.3, Faculty of Science, Kyoto University

Speaker

Masayuki Asaoka (Kyoto University)

Comment

Title

Some finiteness results on abelian varieties

Date

2015.4.15 (Wed) 16:30~17:30    (16:00- tea)

Place

Rm110, Research Institute for Mathematical Sciences, Kyoto University

Speaker

Yoshiyasu Ozeki (RIMS, Kyoto University)

Comment

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