Project/Area Number  09640090 
Research Category 
GrantinAid for Scientific Research (C)

Section  一般 
Research Field 
Geometry

Research Institution  CHIBA UNIVERSITY 
Principal Investigator 
INABA Takashi Faculty of Science, Professor, 理学部, 教授 (40125901)

CoInvestigator(Kenkyūbuntansha) 
KOSHIKAWA Hiroaki Faculty of Education, Associate Professor, 教育学部, 助教授 (60000866)
SUGIYAMA Kenichi Faculty of Science, Associate Professor, 理学部, 助教授 (90206441)
TAKAGI Ryoichi Faculty of Science, Professor, 理学部, 教授 (00015562)
HINO Yoshityki Faculty of Science, Professor, 理学部, 教授 (70004405)
KUGA Ken'ichi Faculty of Science, Associate Professor, 理学部, 助教授 (30186374)

Project Fiscal Year 
1997 – 1998

Project Status 
Completed(Fiscal Year 1998)

Budget Amount *help 
¥2,800,000 (Direct Cost : ¥2,800,000)
Fiscal Year 1998 : ¥1,200,000 (Direct Cost : ¥1,200,000)
Fiscal Year 1997 : ¥1,600,000 (Direct Cost : ¥1,600,000)

Keywords  generalized dynamical systems / foliation / pseudoorbit / pseudoleaf / pseudoleaf tracing property / expansivity / stability / entropy / 広義力学系 / 葉層構造 / 擬軌道 / 擬葉 / 擬葉追跡性 / 拡大性 / 安定性 / エントロピー / 位相安定性 
Research Abstract 
By generalized dynamical systems, we mean a wide class of systems including classical dynamical systems, foliations, pseudogroups and relations. In this research we tried to extend various notions and theorems in classical dynamical systems to generalized systems. The results obtained are as follows. 1. The Reeb foliation and Anosov foliations have the pseudoleaf tracing property. 2. Expansive foliations with the pseudoleaf tracing property are semistable (This is a generaliza tion of BowenWalters theorem in classical dynamical systems). 3. A group action has the pseudoorbit tracing property if and only if its suspension foliation has the pseudoleaf tracing property. 4. A group action has the semistability or the expansivity if and only if its suspension foliation has the same property. 5. We recognized that the notion of the center of mass (defined by Cheeger) is useful in the construction of a pseudoleaf from a given countable subset in the ambient manifold. 6. It seems that the growth of the number of compact leaves cannot be estimated from above by the geometric entropy. We are now trying to produce a counterexample. 7, In the case of foliations it seems that the stability does not imply the pseudoleaf tracing property. These results will be published in Tokyo J.Math. A related result has been published in Erg. Th. Dyn. Sys. We note that the notion of the pseudoleaf (which was introduced in this research) has been applied by Walczak to the new definition of the geometric entropy and the existence of virtual leaves. Hino investigated the stability of processes. Koshikawa studied the cutandpasting method of group actions. And Takagi studied the geometry of real hypersurfaces in the complex projective spaces.
