過去の記録

過去の記録 ~07/14本日 07/15 | 今後の予定 07/16~

博士論文発表会

09:30-10:45   数理科学研究科棟(駒場) 118号室
清水 達郎 氏 (東京大学大学院数理科学研究科)
A construction of a universal finite type invariant of homology 3-spheres(ホモロジー3球面の普遍有限型不変量のひとつの構成) (JAPANESE)

博士論文発表会

11:00-12:15   数理科学研究科棟(駒場) 118号室
平野 雄一 氏 (東京大学大学院数理科学研究科)
Congruences of Hilbert modular forms over real quadratic fields and the special values of L-functions(実2次体上のHilbert保型形式の合同式とL関数の特殊値) (JAPANESE)

博士論文発表会

13:00-14:15   数理科学研究科棟(駒場) 128号室
粕谷 直彦 氏 (東京大学大学院数理科学研究科)
On contact submanifolds of the odd dimensional Euclidean space(奇数次元ユークリッド空間の接触部分多様体について) (JAPANESE)

博士論文発表会

15:00-16:15   数理科学研究科棟(駒場) 128号室
金子 勇治 氏 (東京大学大学院数理科学研究科)
特異値間隔分布によるセルオートマトンの分類 (JAPANESE)

2014年02月10日(月)

博士論文発表会

11:00-12:15   数理科学研究科棟(駒場) 118号室
許 本源 氏 (東京大学大学院数理科学研究科)
Liouville type theorems for the Navier-Stokes equations andapplications(ナヴィエ・ストークス方程式に対するリウヴィル型定理とその応用)
(JAPANESE)

博士論文発表会

13:00-14:15   数理科学研究科棟(駒場) 118号室
柏原 崇人 氏 (東京大学大学院数理科学研究科)
Mathematical and numerical analysis for incompressible fluid equations under friction boundary conditions(摩擦型境界条件下での非圧縮流体の方程式に対する数学解析と数値解析) (JAPANESE)

博士論文発表会

08:00-09:15   数理科学研究科棟(駒場) 128号室
森 真樹 氏 (東京大学大学院数理科学研究科)
A cellular approach to the Hecke-Clifford superalgebra(セルラー代数の手法によるHecke-Clifford スーパー代数の研究) (JAPANESE)

博士論文発表会

09:30-10:45   数理科学研究科棟(駒場) 128号室
柗本 雄也 氏 (東京大学大学院数理科学研究科)
Good reduction criterion for K3 surfaces(K3曲面の良い還元の判定法)
(JAPANESE)

博士論文発表会

13:00-14:15   数理科学研究科棟(駒場) 128号室
池田 暁志 氏 (東京大学大学院数理科学研究科)
Spaces of stability conditions on Calabi-Yau categories associated with quivers(箙に付随するCalabi-Yau圏の安定性条件の空間について)
(JAPANESE)

2014年02月05日(水)

代数学コロキウム

17:10-18:10   数理科学研究科棟(駒場) 002号室
いつもと時間・場所が異なりますのでご注意ください
Neven Grbac 氏 (University of Rijeka)
The Franke filtration of spaces of automorphic forms (ENGLISH)
[ 講演概要 ]
The Franke filtration is a filtration of the space of all adelic automorphic forms on a reductive group defined over a number field. The filtration steps can be described as certain induced representations, which has applications to the study of Eisenstein cohomology. In this talk, we shall describe the Franke filtration in general, give several examples, and explain its connection to cohomology.

2014年02月03日(月)

代数幾何学セミナー

15:30-17:00   数理科学研究科棟(駒場) 122号室
藤田 健人 氏 (京都大学数理解析研究所)
Classification of log del Pezzo surfaces of index three (JAPANESE)
[ 講演概要 ]
Log del Pezzo surfaces constitute an interesting class of rational surfaces and naturally appear in the minimal model program. I will describe an algorithm to classify all the log del Pezzo surfaces of fixed (Q-Gorenstein) index $a$. Especially, I will focus on the case that $a$ is equal to three. This is joint work with Kazunori Yasutake.

GCOEセミナー

16:00-17:00   数理科学研究科棟(駒場) 118号室
Fatiha Alabau 氏 (University of Lorraine)
On the influence of the coupling on the dynamics of under-observed cascade systems of PDE’s (ENGLISH)
[ 講演概要 ]
We consider observability of coupled dynamical systems of hyperbolic and parabolic type when the number of observations is strictly less that the number of unknowns. A main issue is to understand how the lack of observations of certain components is compensated by the coupling information. This talk will present a mathematical approach based on energy methods and some recent positive and negative results on these questions.

GCOEセミナー

17:00-18:00   数理科学研究科棟(駒場) 118号室
Piermarco Cannarsa 氏 (University of Rome Tor Vergata)
Compactness estimates for Hamilton-Jacobi equations (ENGLISH)
[ 講演概要 ]
For scalar conservations laws in one space dimension, P. Lax was the first to obtain compactness properties of the solution semigroup. Such properties were subsequently analyzed by several authors in quantitative terms using Kolmogorov's entropy. In this talk, we shall explain how to adapt such approach to the Hopf-Lax semigroup of solutions to first order Hamilton-Jacobi equations in arbitrary space dimension, and discuss related controllability issues.

2014年02月01日(土)

保型形式の整数論月例セミナー

13:30-16:00   数理科学研究科棟(駒場) 123号室
Bayarmagnai, G. 氏 (National University of Mongolia) 13:30-14:30
On the three dimensional Whittaker functions on SU(2,2) (ENGLISH)
[ 講演概要 ]
The speaker will discuss the technical aspect to have explicit Whittaker functions belonging to principal series representations of SU(2,2) with non-trivial minimal K-types.
織田孝幸 氏 (東京大学・数理科学研究科) 15:00-16:00
Minimal submanifolds on type IV symmetric domains (ENGLISH)
[ 講演概要 ]
In the explicit constructions of fundamental domains in some typical classical domains with respect standard arithmetic discrete subgroups, there appears real minimal hypersurfaces. But this was known only for real rank one cases. We try to find the situation for the cases of rank 2 by some exapmles.

保型形式の整数論月例セミナー

13:30-16:00   数理科学研究科棟(駒場) 123号室
Bayarmagnai, G. 氏 (National University of Mongolia) 13:30-14:30
On the three dimensional Whittaker functions on SU(2,2) (ENGLISH)
[ 講演概要 ]
The speaker will discuss the technical aspect to have explicit Whittaker functions belonging to principal series representations of SU(2,2) with non-trivial minimal K-types.
織田孝幸 氏 (東京大学・数理科学研究科) 15:00-16:00
Minimal submanifolds on type IV symmetric domains (ENGLISH)
[ 講演概要 ]
In the explicit constructions of fundamental domains in some typical classical domains with respect standard arithmetic discrete subgroups, there appears real minimal hypersurfaces. But this was known only for real rank one cases. We try to find the situation for the cases of rank 2 by some exapmles.

保型形式の整数論月例セミナー

13:30-16:00   数理科学研究科棟(駒場) 123号室
Bayarmagnai, G. 氏 (National University of Mongolia) 13:30-14:30
On the three dimensional Whittaker functions on SU(2,2) (ENGLISH)
[ 講演概要 ]
The speaker will discuss the technical aspect to have explicit Whittaker functions belonging to principal series representations of SU(2,2) with non-trivial minimal K-types.
織田孝幸 氏 (東京大学・数理科学研究科) 15:00-16:00
Minimal submanifolds on type IV symmetric domains (ENGLISH)
[ 講演概要 ]
In the explicit constructions of fundamental domains in some typical classical domains with respect standard arithmetic discrete subgroups, there appears real minimal hypersurfaces. But this was known only for real rank one cases. We try to find the situation for the cases of rank 2 by some exapmles.

保型形式の整数論月例セミナー

13:30-16:00   数理科学研究科棟(駒場) 123号室
Bayarmagnai, G. 氏 (National University of Mongolia) 13:30-14:30
On the three dimensional Whittaker functions on SU(2,2) (ENGLISH)
[ 講演概要 ]
The speaker will discuss the technical aspect to have explicit Whittaker functions belonging to principal series representations of SU(2,2) with non-trivial minimal K-types.
織田孝幸 氏 (東京大学・数理科学研究科) 15:00-16:00
Minimal submanifolds on type IV symmetric domains (ENGLISH)
[ 講演概要 ]
In the explicit constructions of fundamental domains in some typical classical domains with respect standard arithmetic discrete subgroups, there appears real minimal hypersurfaces. But this was known only for real rank one cases. We try to find the situation for the cases of rank 2 by some exapmles.

保型形式の整数論月例セミナー

13:30-16:00   数理科学研究科棟(駒場) 123号室
Bayarmagnai, G. 氏 (National University of Mongolia) 13:30-14:30
On the three dimensional Whittaker functions on SU(2,2) (ENGLISH)
[ 講演概要 ]
The speaker will discuss the technical aspect to have explicit Whittaker functions belonging to principal series representations of SU(2,2) with non-trivial minimal K-types.
織田孝幸 氏 (東京大学・数理科学研究科) 15:00-16:00
Minimal submanifolds on type IV symmetric domains (ENGLISH)
[ 講演概要 ]
In the explicit constructions of fundamental domains in some typical classical domains with respect standard arithmetic discrete subgroups, there appears real minimal hypersurfaces. But this was known only for real rank one cases. We try to find the situation for the cases of rank 2 by some exapmles.

保型形式の整数論月例セミナー

13:30-16:00   数理科学研究科棟(駒場) 123号室
Bayarmagnai, G. 氏 (National University of Mongolia) 13:30-14:30
On the three dimensional Whittaker functions on SU(2,2) (ENGLISH)
[ 講演概要 ]
The speaker will discuss the technical aspect to have explicit Whittaker functions belonging to principal series representations of SU(2,2) with non-trivial minimal K-types.
織田孝幸 氏 (東京大学・数理科学研究科) 15:00-16:00
Minimal submanifolds on type IV symmetric domains (ENGLISH)
[ 講演概要 ]
In the explicit constructions of fundamental domains in some typical classical domains with respect standard arithmetic discrete subgroups, there appears real minimal hypersurfaces. But this was known only for real rank one cases. We try to find the situation for the cases of rank 2 by some exapmles.

保型形式の整数論月例セミナー

13:30-16:00   数理科学研究科棟(駒場) 123号室
Bayarmagnai, G. 氏 (National University of Mongolia) 13:30-14:30
On the three dimensional Whittaker functions on SU(2,2) (ENGLISH)
[ 講演概要 ]
The speaker will discuss the technical aspect to have explicit Whittaker functions belonging to principal series representations of SU(2,2) with non-trivial minimal K-types.
織田孝幸 氏 (東京大学・数理科学研究科) 15:00-16:00
Minimal submanifolds on type IV symmetric domains (ENGLISH)
[ 講演概要 ]
In the explicit constructions of fundamental domains in some typical classical domains with respect standard arithmetic discrete subgroups, there appears real minimal hypersurfaces. But this was known only for real rank one cases. We try to find the situation for the cases of rank 2 by some exapmles.

保型形式の整数論月例セミナー

13:30-16:00   数理科学研究科棟(駒場) 123号室
Bayarmagnai, G. 氏 (National University of Mongolia) 13:30-14:30
On the three dimensional Whittaker functions on SU(2,2) (ENGLISH)
[ 講演概要 ]
The speaker will discuss the technical aspect to have explicit Whittaker functions belonging to principal series representations of SU(2,2) with non-trivial minimal K-types.
織田孝幸 氏 (東京大学・数理科学研究科) 15:00-16:00
Minimal submanifolds on type IV symmetric domains (ENGLISH)
[ 講演概要 ]
In the explicit constructions of fundamental domains in some typical classical domains with respect standard arithmetic discrete subgroups, there appears real minimal hypersurfaces. But this was known only for real rank one cases. We try to find the situation for the cases of rank 2 by some exapmles.

2014年01月31日(金)

談話会・数理科学講演会

16:30-17:30   数理科学研究科棟(駒場) 122号室
旧記録は、上記セミナーURLにあります。
お茶&Coffee&お菓子: 16:00~16:30 (コモンルーム)。

Jean-Pierre Puel 氏 (Université de Versailles Saint-Quentin-en-Yvelines)
Controllability of fluid flows (ENGLISH)
[ 講演概要 ]
First of all we will describe in an abstract situation the various concepts
of controllability for evolution equations.
We will then present some problems and results concerning the
controllability of systems modeling fluid flows.
First of all we will consider the Euler equation describing the motion of an
incompressible inviscid fluid.
Then we will give some results concerning the Navier-Stokes equations,
modeling an incompressible viscous fluid, and some related systems.
Finally we will give a first result of controllability for the case of a
compressible fluid (in dimension 1) and some important open problems.

2014年01月30日(木)

Kavli IPMU Komaba Seminar

17:00-18:30   数理科学研究科棟(駒場) 128号室
Hans Jockers 氏 (The University of Bonn)
Characteristic classes from 2d renormalized sigma-models (ENGLISH)
[ 講演概要 ]
The Hirzebruch-Riemann-Roch formula relates the holomorphic Euler characteristic
of holomorphic vector bundles to topological invariants of compact complex manifold.
I will explain a generalization of the Mukai's modified first Chern character map, which
introduces certain characteristic classes that have not been considered in this form by
Hirzebruch. This naturally leads to the characteristic Gamma class based on the Gamma
function. The characteristic Gamma class has a surprising relation to the quantum theory
of certain 2d sigma-models with compact complex manifolds as their target spaces. I will
argue that the Gamma class describes perturbative quantum corrections to the classical
theory of those sigma models.

2014年01月28日(火)

数値解析セミナー

16:30-18:00   数理科学研究科棟(駒場) 118号室
教室がいつもと異なっていますので、ご注意ください
村川秀樹 氏 (九州大学大学院数理学研究院)
細胞接着の数理モデルについて (JAPANESE)
[ 講演概要 ]
多細胞生物のからだを構成する細胞は独立に存在するのではなく、細胞同士が接着したり、細胞外基質に接着して存在している。細胞同士の接着は細胞接着または細胞間接着と呼ばれる。Armstrong、Painter、Sherratt (2006)は細胞集団の挙動を理解するために、細胞接着を考慮した数理モデルを提案した。そのモデルは多くの研究者の興味を引き、精力的に研究が進められているが、数値実験の結果からはそのモデルが現象を記述しているとは言い難い。その数理モデルの問題点を精査し、現象を記述する新たな数理モデルを提案する。
[ 参考URL ]
http://www.infsup.jp/utnas/

解析学火曜セミナー

16:30-18:00   数理科学研究科棟(駒場) 128号室
This seminar is cosponsored by the GCOE program.
Arnaud Ducrot 氏 (ボルドー大学)
Asymptotic behaviour of a non-local diffusive logistic equation (ENGLISH)
[ 講演概要 ]
In this talk we investigate the long time behaviour of a logistic type equation modelling the motion of cells. The equation we consider takes into account birth and death process using a simple logistic effect as well as a non-local motion of cells using non-local Darcy’s law with regular kernel. Using the periodic framework we first investigate the well-posedness of the problem before deriving some information about its long time behaviour. The lack of asymptotic compactness of the system is overcome by making use of Young measure theory. This allows us to conclude that the semiflow converges for the Young measure topology.

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