Seminar information archive

Seminar information archive ~02/13Today's seminar 02/14 | Future seminars 02/15~

2026/02/10

Numerical Analysis Seminar

16:30-18:00   Room #122 (Graduate School of Math. Sci. Bldg.)
Franz Chouly (Universidad de la República)
Finite Element Methods for the Elasto-Plastic Torsion Problem (English)
[ Abstract ]
We will describe finite element methods for the elasto-plastic torsion problem, as a prototype of variational inequality with constraints on the gradient of the solution. This problem has been an object of study from the theoretical viewpoint since the 1970s. From the numerical analysis viewpoint, it remains difficult to obtain optimal a priori error estimates. We will present the numerical analysis and numerical results for three methods based on standard Lagrange finite elements of orden 1 or 2: a direct discretization and a Nitsche discretization of a modified variational inequality, when the source term is constant, and a penalty technique for a non constant source term. Particularly the Nitsche technique yields fully optimal a priori error bounds. This is a joint work with Patrick Hild (Université Paul Sabatier, Toulouse, France) and Tom Gustafsson (Aalto University, Finland).
[ Reference URL ]
https://sites.google.com/g.ecc.u-tokyo.ac.jp/utnas-bulletin-board/

2026/01/23

thesis presentations

9:15-10:30   Room #118 (Graduate School of Math. Sci. Bldg.)
范 凌虎 (東京大学大学院数理科学研究科)
Modular quotient singularities and their crepant resolutions
(モジュラー商特異点とそのクレパント解消)

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)

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203 Next >