Seminar information archive

Seminar information archive ~04/24Today's seminar 04/25 | Future seminars 04/26~

thesis presentations

11:00-12:15   Room #118 (Graduate School of Math. Sci. Bldg.)
大貫 紘嵩 (東京大学大学院数理科学研究科)
Global +-regularity of regular del Pezzo surfaces in mixed characteristic
(混標数の正則 del Pezzo 曲面の大域的+正則性)

thesis presentations

13:00-14:15   Room #118 (Graduate School of Math. Sci. Bldg.)
夏 小焜 (東京大学大学院数理科学研究科)
Reflection vectors in the quantum cohomology of a blowup
(ブローアップの量子コホモロジーの鏡映ベクトルについて)

thesis presentations

14:45-16:00   Room #118 (Graduate School of Math. Sci. Bldg.)
杉本 悠太郎 (東京大学大学院数理科学研究科)
On the dynamical degrees over abelian varieties and rational varieties
(アーベル多様体および有理多様体上の力学的次数について)

thesis presentations

11:00-12:15   Room #122 (Graduate School of Math. Sci. Bldg.)
前川 拓海 (東京大学大学院数理科学研究科)
A six-functor formalism for sheaves over locally proper maps and the Bauer-Furuta construction
(局所固有写像上の層に対する六つの関手の枠組み,そしてBauer-Furutaの構成)

thesis presentations

13:00-14:15   Room #122 (Graduate School of Math. Sci. Bldg.)
土屋 正朗 (東京大学大学院数理科学研究科)
On a relation between two types of Symmetry Breaking Operators from O(2, 1) to O(1, 1)
(O(2, 1) から O(1, 1) への 2 種類の Symmetry Breaking Operator の関係性について)

thesis presentations

14:45-16:00   Room #122 (Graduate School of Math. Sci. Bldg.)
樋川 達郎 (東京大学大学院数理科学研究科)
On the (k, a)-generalized Fourier transform and the minimal representation of the conformal group
((k, a)-一般化Fourier変換と共形変換群の極小表現について)

thesis presentations

9:15-10:30   Room #126 (Graduate School of Math. Sci. Bldg.)
HAFID Ayoub (東京大学大学院数理科学研究科)
Noncommutative coarse metric geometry
(非可換疎距離幾何)

thesis presentations

11:00-12:15   Room #126 (Graduate School of Math. Sci. Bldg.)
朱 浩哲 (東京大学大学院数理科学研究科)
Pure States of the Second Order Irrational Rotation Algebra Arising from Automorphisms of the Hyperfinite II1 Factor
(超有限II1型因子環の自己同型から生じる2次無理数回転環の純粋状態)

thesis presentations

13:00-14:15   Room #126 (Graduate School of Math. Sci. Bldg.)
洞 龍弥 (東京大学大学院数理科学研究科)
Connecteness and full subcategories of topoi
(トポスの連結性と充満部分圏)

thesis presentations

14:45-16:00   Room #126 (Graduate School of Math. Sci. Bldg.)
岡 優丞 (東京大学大学院数理科学研究科)
Solvability of nonlinear parabolic equations with singular data and Besov-Morrey spaces
(特異データを有する非線形放物型方程式の可解性とべゾフ・モレイ空間)

thesis presentations

9:15-10:30   Room #128 (Graduate School of Math. Sci. Bldg.)
田川 智也 (東京大学大学院数理科学研究科)
Spectral and Microlocal Analysis of
Schrödinger Equations with Slowly Decaying and Perturbed Harmonic Oscillator Potentials
(緩やかに減衰するポテンシャルおよび調和振動子型ポテンシャルに関するシュレーディンガー方程式のスペクトル解析と超局所解析)

thesis presentations

14:45-16:00   Room #128 (Graduate School of Math. Sci. Bldg.)
井上 卓哉 (東京大学大学院数理科学研究科)
A bijection between symmetric plane partitions and quasi transpose
complementary plane partitions
(対称な平面分割と擬転置相補な平面分割の間の全単射)

2026/01/22

thesis presentations

9:15-10:30   Room #118 (Graduate School of Math. Sci. Bldg.)
山本 寛史 (東京大学大学院数理科学研究科)
Computing the local 2-component of a non-selfdual automorphic representation of GL3
(GL3の非自己双対保型表現の局所2進成分の計算)

thesis presentations

11:00-12:15   Room #118 (Graduate School of Math. Sci. Bldg.)
高梨 悠吾 (東京大学大学院数理科学研究科)
On the Hiraga-Ichino-Ikeda conjecture on formal degrees for G2
(G2の形式次数における平賀・市野・池田予想について)

thesis presentations

13:00-14:15   Room #118 (Graduate School of Math. Sci. Bldg.)
三神 雄太郎 (東京大学大学院数理科学研究科)
(φ,Γ)-modules over relatively discrete algebras
(相対離散的な環上の(φ,Γ)加群)

thesis presentations

14:45-16:00   Room #118 (Graduate School of Math. Sci. Bldg.)
軽部 友裕 (東京大学大学院数理科学研究科)
A study on Bridgeland stability conditions and the noncommutative minimal model program for blowup surfaces
(ブローアップ曲面に対するBridgeland 安定性条件と非可換極小モデルプログラムの研究)

thesis presentations

11:00-12:15   Room #122 (Graduate School of Math. Sci. Bldg.)
村上 聡梧 (東京大学大学院数理科学研究科)
On the shadowing property of differentiable dynamical systems beyond structural stability
(構造安定性を持たない可微分力学系の擬軌道追跡性について)

thesis presentations

13:00-14:15   Room #122 (Graduate School of Math. Sci. Bldg.)
前田 航志 (東京大学大学院数理科学研究科)
On the square integrability of regular representations on reductive homogeneous spaces
(簡約型等質空間上の正則表現の二乗可積分性について)

thesis presentations

9:15-10:30   Room #126 (Graduate School of Math. Sci. Bldg.)
石倉 宙樹 (東京大学大学院数理科学研究科)
Decomposition of Borel graphs and cohomology
(ボレルグラフの分解とコホモロジー)

thesis presentations

13:00-14:15   Room #126 (Graduate School of Math. Sci. Bldg.)
神田 秀峰 (東京大学大学院数理科学研究科)
Studies on Oeljeklaus–Toma manifolds
(Oeljeklaus–Toma多様体についての研究)

thesis presentations

14:45-16:00   Room #126 (Graduate School of Math. Sci. Bldg.)
粟津 光 (東京大学大学院数理科学研究科)
Amenability of group actions on compact spaces and the associated Banach algebras
(コンパクト空間への群作用の従順性と、作用に付随するバナッハ環の従順性に関して)

thesis presentations

9:15-10:30   Room #128 (Graduate School of Math. Sci. Bldg.)
荒井 勇人 (東京大学大学院数理科学研究科)
Autoequivalences and stability conditions on a degenerate K3 surface
(退化K3曲面の自己同値と安定性条件)

thesis presentations

13:00-14:15   Room #128 (Graduate School of Math. Sci. Bldg.)
吉田 淳一郎 (東京大学大学院数理科学研究科)
Quasi-Maximum Likelihood and Penalized Estimation for Non-Regular Models
(非正則モデルに対する擬似最尤推定および罰則付き推定)

thesis presentations

14:45-16:00   Room #128 (Graduate School of Math. Sci. Bldg.)
塩谷 天章 (東京大学大学院数理科学研究科)
Statistical inference for highly correlated point processes with applications to lead-lag analysis
(高相関点過程に対する統計推測とリード・ラグ解析への応用)

2026/01/21

Tuesday Seminar on Topology

16:00-17:00   Room #hybrid/118 (Graduate School of Math. Sci. Bldg.)
Pre-registration required. See our seminar webpage.
Ingrid Irmer (Southern University of Science and Technology)
Understanding the well-rounded deformation retraction of Teichmüller space (ENGLISH)
[ Abstract ]
The term "well-rounded deformation retraction" goes back to a paper of Ash in which equivariant deformation retractions of the space of $n\times n$ positive-definite real symmetric matrices acted on by $SL(n,\mathbb{Z})$ were studied. An informal analogy between families of groups, such as $SL(n,\mathbb{Z})$, $Out(F_{n})$ and mapping class groups, suggests the existence of a similar equivariant deformation retractions of the actions of $Out(F_{n})$ and mapping class groups on well-chosen spaces. In all these examples, there are spaces on which the respective groups act with known equivariant deformation retractions onto cell complexes of the smallest possible dimension --- the virtual cohomological dimension of the group. The purpose of this talk is to explain that the equivariant deformation retraction of the action of the mapping class group on Teichmüller space can be understood to be a piecewise-smooth analogue of Ash's well rounded deformation retraction. The key idea is to understand the role of duality in correctly drawing this analogy.
[ Reference URL ]
https://park.itc.u-tokyo.ac.jp/MSF/topology/TuesdaySeminar/index_e.html

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