Seminar information archive

Seminar information archive ~08/18Today's seminar 08/19 | Future seminars 08/20~

thesis presentations

12:45-14:00   Room #126 (Graduate School of Math. Sci. Bldg.)
森田 陽介 (東京大学大学院数理科学研究科)
A cohomological study of the existence problem of compact Clifford-Klein forms (コンパクトClifford-Klein形の存在問題のコホモロジー的研究) (JAPANESE)

thesis presentations

14:15-15:30   Room #126 (Graduate School of Math. Sci. Bldg.)
川口 徳昭 (東京大学大学院数理科学研究科)
On the quantitative shadowing property of topological dynamical systems (位相的力学系の量的擬軌道追跡性について) (JAPANESE)

thesis presentations

9:15-10:30   Room #128 (Graduate School of Math. Sci. Bldg.)
鈴木 拓也 (東京大学大学院数理科学研究科)
Semigroups generated by higher order elliptic operators and the Stokes operators in end point spaces (端点型空間上の高階楕円型作用素やストークス作用素により生成される半群) (JAPANESE)

thesis presentations

10:45-12:00   Room #128 (Graduate School of Math. Sci. Bldg.)
榊原 航也 (東京大学大学院数理科学研究科)
Mathematical analysis of the method of fundamental solutions with its application to fluid mechanics and complex analysis (基本解近似解法の数学解析およびその流体力学,複素解析への応用) (JAPANESE)

thesis presentations

12:45-14:00   Room #128 (Graduate School of Math. Sci. Bldg.)
杉谷 宜紀 (東京大学大学院数理科学研究科)
Numerical Analysis for Interface and Nonlinear Boundary Value Problems for the Stokes Equations (ストークス方程式に対するインターフェースおよび非線形境界値問題の数値解析) (JAPANESE)

thesis presentations

14:15-15:30   Room #128 (Graduate School of Math. Sci. Bldg.)
戸澤 一成 (東京大学大学院数理科学研究科)
Meta-continuation Semantics via Meta-lambda Calculus (メタラムダ計算を用いたメタ継続意味論) (JAPANESE)

2017/02/02

thesis presentations

10:45-12:00   Room #118 (Graduate School of Math. Sci. Bldg.)
斎藤 俊輔 (東京大学大学院数理科学研究科)
Stability of anti-canonically balanced metrics(反標準的平衡化計量の安定性)
(JAPANESE)

thesis presentations

12:45-14:00   Room #118 (Graduate School of Math. Sci. Bldg.)
荒野 悠輝 (東京大学大学院数理科学研究科)
Representation theory of Drinfeld doubles (ドリンフェルトダブルの表現論) (JAPANESE)

thesis presentations

14:15-15:30   Room #118 (Graduate School of Math. Sci. Bldg.)
八尋 耕平 (東京大学大学院数理科学研究科)
Radon transform for twisted D-modules on partial flag varieties (一般旗多様体上の捻られたD-加群のラドン変換) 
(JAPANESE)

thesis presentations

15:45-17:00   Room #118 (Graduate School of Math. Sci. Bldg.)
折田 龍馬 (東京大学大学院数理科学研究科)
On the existence of infinitely many non-contractible periodic trajectories in Hamiltonian dynamics on closed symplectic manifolds (閉シンプレクティック多様体上のハミルトン力学系における無限個の非可縮周期軌道の存在について) (JAPANESE)

thesis presentations

17:15-18:30   Room #118 (Graduate School of Math. Sci. Bldg.)
林 晋 (東京大学大学院数理科学研究科)
Topological invariants and localized wave functions for some topological phases (ある種のトポロジカル相に対する位相不変量と局在化した波動関数の関係について) (JAPANESE)

thesis presentations

9:15-10:30   Room #122 (Graduate School of Math. Sci. Bldg.)
李 嘉衣 (東京大学大学院数理科学研究科)
Sharp interface limit for the stochastic Allen-Cahn equation
(確率アレン・カーン方程式に対する鋭敏な界面極限)
(JAPANESE)

thesis presentations

10:45-12:00   Room #122 (Graduate School of Math. Sci. Bldg.)
徐 路 (東京大学大学院数理科学研究科)
Scaling limits in stochastic heat equation and stochastic chain model (確率熱方程式および確率鎖模型に対するスケール極限)
(JAPANESE)

thesis presentations

12:45-14:00   Room #122 (Graduate School of Math. Sci. Bldg.)
星野 壮登 (東京大学大学院数理科学研究科)
Approximations of singular stochastic PDEs and their global well-posedness (特異な確率偏微分方程式の近似とその時間大域的適切性) (JAPANESE)

thesis presentations

15:45-17:00   Room #122 (Graduate School of Math. Sci. Bldg.)
難波 時永 (東京大学大学院数理科学研究科)
Analysis for Viscosity Solutions with Special Emphasis on Anomalous Effects (不規則効果を強調した粘性解析) (JAPANESE)

thesis presentations

17:15-18:30   Room #122 (Graduate School of Math. Sci. Bldg.)
伊藤 涼 (東京大学大学院数理科学研究科)
Analysis of the minimal travelling wave speed via the methods of Young measures (進行波の最小速度のYoung 測度による解析) (JAPANESE)

thesis presentations

9:15-10:30   Room #126 (Graduate School of Math. Sci. Bldg.)
大矢 浩徳 (東京大学大学院数理科学研究科)
Twist maps on quantized coordinate algebras (量子座標環における捻り写像) (JAPANESE)

thesis presentations

10:45-12:00   Room #126 (Graduate School of Math. Sci. Bldg.)
Gantsooj Batzaya (東京大学大学院数理科学研究科)
On simultaneous approximation to a pair of powers of a real number by rational numbers (実数の冪の対の有理数による同時近似について)

thesis presentations

12:45-14:00   Room #126 (Graduate School of Math. Sci. Bldg.)
杉山 聡 (東京大学大学院数理科学研究科)
Fukaya categories, surface Lefschetz fibrations, and Koszul duality theory (Fukaya 圏、曲面Lefschetz 束、Koszul 双対について) (JAPANESE)

thesis presentations

14:15-15:30   Room #126 (Graduate School of Math. Sci. Bldg.)
藤内 翔太 (東京大学大学院数理科学研究科)
Partially ordered sets, order complexes and CAT(0) properties (半順序集合,順序複体,及びCAT(0) 性)
(JAPANESE)

2017/01/30

Tokyo Probability Seminar

16:50-18:20   Room #128 (Graduate School of Math. Sci. Bldg.)
Jun Misumi (Faculty of Science, Kochi University)

2017/01/27

Algebraic Geometry Seminar

14:00-17:30   Room #122 (Graduate School of Math. Sci. Bldg.)
Luca Tasin (Roma Tre University) 14:00-15:30
On the number and boundedness of minimal models of general type (English)
[ Abstract ]
In this talk I will explain that the number of minimal models yields a constructible function on the base of any family of varieties of general type. From this it follows that the number of minimal models of a variety of general type can be bounded in terms of its volume. I will also show that in any dimension minimal models of general type and bounded volume form a bounded family. This is based on a joint work with D. Martinelli and S. Schreieder.
Roberto Svaldi (University of Cambridge/SISSA) 16:00-17:30
Adjoint dimension of foliations (English)
[ Abstract ]
The classification of foliated surfaces by Brunella, McQuillan and Mendes carries many similarities with Enriques-Kodaira classification of surfaces but also many important differences. I will discuss an alternative classification scheme where the role of differential forms along the leaves is replaced by differential forms along the leaves with values in fractional powers of the conormal bundle of the foliation. In this alternative setup one obtains a classification of foliated surfaces closer to the usual Enriques-Kodaira classification. If time permits, I will show how to apply this alternative classification to describe the Zariski closure of the set foliations which admit rational first integral of bounded genus in families of foliated surfaces. Joint work with Jorge Vitorio Pereira.
[ Reference URL ]
https://www.dpmms.cam.ac.uk/~rs872/

2017/01/26

Seminar on Probability and Statistics

13:00-16:00   Room #052 (Graduate School of Math. Sci. Bldg.)
Ioane Muni Toke (Centrale Supelec Paris)
High-frequency financial data : trades and quotes databases, order flows and time resolution I, II, III

[ Abstract ]
I present some of the challenges associated with preparing high-frequency trades and quotes databases for statistics purposes. In a first part, I investigate TRTH tick-by-tick data on three exchanges (Paris, London and Frankfurt) and on a five-year span. I analyse the performances of a procedure of reconstruction of orders flows. This turns out to be a forensic tool assessing the quality of the database: significant technical changes affecting the exchanges are tracked through the data. Moreover, the choices made when reconstructing order flows may have consequences on the quantitative models that are calibrated afterwards on such data. I also provide a refined look at the Lee–Ready procedure and its optimal lags. Findings are in line with both financial reasoning and the analysis of an illustrative Poisson model. In a second part, I investigate Nikkei-packaged Tokyo-traded ETF data. The application the order flow reconstruction procedure underlines the differences between the TRTH and Nikkei data. In a brief last part, we will discuss the time resolution of these databases and the potential problems arising when modelling a limit order book with simple point processes.

2017/01/24

Tuesday Seminar on Topology

17:00-18:00   Room #056 (Graduate School of Math. Sci. Bldg.)
Ryuma Orita (The University of Tokyo)
On the existence of infinitely many non-contractible periodic trajectories in Hamiltonian dynamics on closed symplectic manifolds (JAPANESE)
[ Abstract ]
We show that the presence of a non-contractible Hamiltonian one-periodic trajectory in a closed symplectic manifold yields the existence of infinitely many non-contractible periodic trajectories, provided that the symplectic form is aspherical and the fundamental group is virtually abelian. Moreover, we also show that a similar statement holds for closed monotone or negative monotone symplectic manifolds having virtually abelian fundamental groups. These results are certain generalizations of works by Ginzburg and Gurel who proved a similar statement holds for atoroidal or toroidally monotone closed symplectic manifolds. The proof is based on the machinery of filtered Floer--Novikov homology for non-contractible periodic trajectories.

Tuesday Seminar on Topology

18:00-19:00   Room #056 (Graduate School of Math. Sci. Bldg.)
Noriaki Kawaguchi (The University of Tokyo)
Quantitative shadowing property, shadowable points, and local properties of topological dynamical systems (JAPANESE)
[ Abstract ]
Shadowing property has been one of the key notions in topological hyperbolic dynamics, which is also common since C^0-generic homeomorphisms on a smooth closed manifold satisfy the property for instance. In this talk, the shadowing property in relation to other chaotic or non-chaotic properties of dynamical systems (entropy, sensitivity, equicontinuity, etc.) is discussed. Also, we introduce an idea of localizing and quantifying the shadowing property following the recent work of Morales, and present some of its consequences. The idea is shown to be effective for the description of local properties of dynamical systems.

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