| Project/Area Number |
11640074
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geometry
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| Research Institution | Kyoto Institute of Technology |
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Principal Investigator |
YAGASAKI Tatsuhiko kyoto Institute of Technology, Faculty of Engineering and Design, Associate Professor, 工芸学部, 助教授 (40191077)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAOKA Akira KIT, Faculty of Engineering and Design, Professor, 工芸学部, 教授 (90027920)
ASADA Mamoru KIT, Faculty of Engineering and Design, Associatc Professor, 工芸学部, 助教授 (30192462)
MAITANI Fumio KIT, Faculty of Engineering and Design, Professor, 工芸学部, 教授 (10029340)
SAKAI Katsuro University of Tsukuba, Department of Mathematics, Associate Professor, 数学系, 助教授 (50036084)
OKURA Hiroyuki KIT, Faculty of Engineering and Design, Associate Professor, 工芸学部, 助教授 (80135649)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2000: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1999: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | 2-manifold / homeomorphism / PL-homeomorphism / Lipschitz homeomorphism / homeomorphism group / infinite-dimensional manifold / Ricmann surface / quasiconformal map / 埋め込み / タイヒミュラー空間 / 写像類群 |
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| Research Abstract |
The homotopy ad topological types of groups of CAT-homeomorphism of compact 2-manifolds were studied by various authors for CAT=DIFF, PL and TOP.In this research we classified those of the homeomorphism groups of the noncompact 2-manifolds and the embedding spaces into 2-manifolds in TOP.
Suppose M is a 2-manifold without boundary and X is a compact subpolyhedron of M.Let H (M) and ε(X,M) denote the homeomorphism group of M and the space of embeddings of X into M.The subscript "0"denotes the connected component of the identity or the inclusion.
1. (Bundle) We showed that the restriction map π : H (M) _0 →ε (X,M)_0 is a principal bundle, and obtained a sufficient condition for the fiber to be connected.
2. (Homotopy Type) In the case where M is noncompact and connected, we classified the homotopy type of H (M)_0 and showed that they are contractible except for a few cases. We also classified the homotopy types of ε(X,M) _0 in the case where X is connected.
3.(Topological Type) We showed that H(M)_0 is a l_2-manifold in the case where M is noncompact and connected, and thatε(X,M) is also a l_2-manifold. Therefore, the topological types of these spaces can be classified with based upon their homotopy types.
4. (PL Lipschitz Quasiconformal case) We obtained the corresponding results for the subgroups of PL Lipschitz Quasiconformal homeomorphisms and embeddings. For example, (1) when M is a noncompact connected PL 2-manifold, the subgroup of PL-homeomorphisms H^<PL>(M)_0 is a σ^∞-manifold, and (2) when M is a Ricmann surface, the subgroup of quasiconformal homeomorphisms H^<QC>(M)_0 is a Σ-manifold. In these cases, the inclusions H^<PL>(M)_0⊂H(M)_0 and H^<QC>(M)_0⊂H(M)_0 are fine homotopy equivalences.
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