今後の予定

過去の記録 ~01/20本日 01/21 | 今後の予定 01/22~

2017年01月23日(月)

複素解析幾何セミナー

10:30-12:00   数理科学研究科棟(駒場) 128号室
野口 潤次郎 氏 (東京大学)
A unified proof of Cousin I, II and d-bar equation on domains of holomorphy (JAPANESE)
[ 講演概要 ]
Oka's J\^oku-Ik\^o says that holomorphic functions on a complex submanifold of a polydisk extend holomorphically to the whole polydisk. By making use of Oka's J\^oku-Ik\^o we give a titled proof with introducing an argument that represents one of the three cases.
The proof is a modification of the cube dimension induction, used in the proof of Oka's Syzygy for coherent sheaves.

2017年01月24日(火)

トポロジー火曜セミナー

17:00-18:00   数理科学研究科棟(駒場) 056号室
Tea: Common Room 16:30-17:00
折田 龍馬 氏 (東京大学大学院数理科学研究科)
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)
[ 講演概要 ]
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.

トポロジー火曜セミナー

18:00-19:00   数理科学研究科棟(駒場) 056号室
川口 徳昭 氏 (東京大学大学院数理科学研究科)
Quantitative shadowing property, shadowable points, and local properties of topological dynamical systems (JAPANESE)
[ 講演概要 ]
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.

2017年01月26日(木)

統計数学セミナー

13:00-   数理科学研究科棟(駒場) 052号室
Ioane Muni Toke 氏 (Ecole Centrale Paris and University of New Caledonia)

2017年01月27日(金)

代数幾何学セミナー

14:00-17:30   数理科学研究科棟(駒場) 122号室
今週は金曜日に2つの講演があります。Two lectures will be delivered on Friday.
Luca Tasin 氏 (Roma Tre University) 14:00-15:30
On the number and boundedness of minimal models of general type (English)
[ 講演概要 ]
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 氏 (University of Cambridge/SISSA) 16:00-17:30
Adjoint dimension of foliations (English)
[ 講演概要 ]
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.
[ 講演参考URL ]
https://www.dpmms.cam.ac.uk/~rs872/

2017年01月30日(月)

東京確率論セミナー

16:50-18:20   数理科学研究科棟(駒場) 128号室
三角 淳 氏 (高知大学理学部)
フラクタル格子上の長距離浸透モデルとランダムウォーク

2017年02月07日(火)

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
Chenyang Xu 氏 (Beijing International Center of Mathematics Research)
TBA (English)
[ 講演概要 ]
TBA

2017年02月09日(木)

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
Chenyang Xu 氏 (Beijing International Center of Mathematics Research)
TBA (English)
[ 講演概要 ]
TBA

2017年02月13日(月)

複素解析幾何セミナー

10:30-12:00   数理科学研究科棟(駒場) 128号室
Qi'an Guan 氏 (北京大学)
A Characterization of regular points by Ohsawa-Takegoshi Extension Theorem (ENGLISH)
[ 講演概要 ]
In this talk, we will present that the germ of a complex analytic set at the origin in $\mathbb{C}^n$ is regular if and only if the related Ohsawa-Takegoshi extension theorem holds. We also present a necessary condition of the $L^2$ extension of bounded holomorphic sections from singular analytic sets.
This is joint work with Dr. Zhenqian Li.

東京確率論セミナー

16:50-18:20   数理科学研究科棟(駒場) 128号室
横山 聡 氏 (東京大学大学院数理科学研究科)
TBA