立命館大学数理科学科

講演者： Gilbert Hector （リヨン第一大学）
タイトル： Ends of graphs, finitely generated groups and group actions
日時：9月23日（金） 16:30-17:30
場所：立命館大学 びわこ・くさつキャンパス ウェストウィング7階 第1数学研究室
概要：
We will present a simple and quick proof of the following genericity
property for group actions first stated by Cantwell-Conlon:

Theorem. – Let G be a finitely generated group of homeomorphisms of a
compact space K. If all orbits of G are dense, there exists a residual
Baire set W of orbits such that
i) all orbits in W have the same endset E(W),
ii) E(W) is either a singleton, a pair of points or a Cantor set.

By the classical theorem of Hopf-Freudenthal the endset E(G) of G
verifies property ii) as well; so we will also discuss the possible
equality E(G) = E(W).
We will recall all concepts needed for the talk.

立命館大学幾何学セミナー

日時：2016年9月26日(月)16:30～17:30

場所：立命館大学びわこ・くさつキャンパス(BKC)
　　　  ウェストウィング7階数学第1研究室
 
講演者：古谷賢朗（東京理科大学）

講演題目：A co-dimension 3 sub-Riemannian structure on Gromoll-Meyer exotic sphere
 
アブストラクト：
We construct a co-dimension 3 completely non-holonomic sub-bundle on the Gromoll-Meyer exotic 7 sphere based on its realization as a base space of Sp(2) principal bundle with the structure group Sp(1). The same method is valid for constructing a co-dimension 3 sub-bundle on the standard 7 sphere (and also on 4n+3 dimensional standard sphere). For the standard sphere cases a co-dimension 3 sub-bundle was constructed by making use of the Hopf bundle. Our method gives a simple proof for the standard case.

• Date : 8 Sep. (Thu.)
• Place: W.W. 7th-floor, 4th lab.
• Time : 16:30-18:00
• Speaker:  Simona Sanfelici(University of Parma)
• Title: FAST NUMERICAL PRICING OF BARRIER OPTIONS UNDER STOCHASTIC VOLATILITY AND JUMPS

≫ 続きを読む

• Date : 25 Aug. (Thu.)
• Place: W.W. 7th-floor, 4th lab.
• Time : 16:30-18:00
• Speaker:  Yuri Imamura(Tokyo university of science)
• Title: The Value of Timing Risk

≫ 続きを読む

• Date : 28 Jul. (Thu.)
• Place: W.W. 7th-floor, 4th lab.
• Time : 16:30-18:00
• Speaker:  Masanori Koyama(Ritsumeikan university)
• Title: TBA

• Date : 21 Oct. (Thu.)
• Place: W.W. 6th-floor, Colloquium Room
• Time : 16:30-18:00
• Speaker:  Naotaka Kajino(Kobe University)
• Title: 多重Dynkin-Hunt公式による拡散過程の熱核の上方評価とLiouville Brown運動への応用

≫ 続きを読む

• Date : 14 Jul. (Thu.)
• Place: W.W. 7th-floor, 4th lab.
• Time : 16:30-18:00
• Speaker:  Laurent Denis (Universite de Mans)
• Title: Chaotic extensions and the lent particle method for Brownian motion

≫ 続きを読む

• Date : 7 Jul. (Thu.)
• Place: W.W. 7th-floor, 4th lab.
• Time : 16:30-18:00
• Speaker: Yuuki Ida (Ritsumeikan University) 
• Title: Generalized Reflection Principle for SABR model

• Date : 16 Jun. (Thu.)
• Place: W.W. 7th-floor, 4th lab.
• Time : 16:30-18:00
• Speaker: Dai Taguchi (Ritsumeikan University)
• Title: Weak rate of convergence for the Euler-Maruyama scheme with fractional differential drift