Each closed oriented 3-manifold M is naturally associated with a set of integers D(M), the degrees of all self-maps on M. D(M) is determined for each torus bundle and semi-bundle M. The structure of torus semi-bundle is studied in detail. The paper is a part of a project to determine D(M) for all 3-manifolds in Thurston's picture.
机构:
Peking Univ, Sch Math Sci, Beijing 100871, Peoples R China
Peking Univ, LMAM, Beijing 100871, Peoples R ChinaPeking Univ, Sch Math Sci, Beijing 100871, Peoples R China
Ding, Fan
Li, Youlin
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机构:
Shanghai Jiao Tong Univ, Sch Math Sci, Shanghai 200240, Peoples R ChinaPeking Univ, Sch Math Sci, Beijing 100871, Peoples R China