| 夏大峰,张雨田.向量场的积分曲线分类和链群与有向同伦不变性[J].数学年刊A辑,2011,32(3):345~354 |
| 向量场的积分曲线分类和链群与有向同伦不变性 |
| The Classification of Integral Curves and Chain-groups in Vector Field and Homotopy Invariance |
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| DOI： |
| 中文关键词: 向量场 积分曲线 极限集 链群 同伦 |
| 英文关键词:Vector field Integral curve Limit set Chain-group Homotopy |
| 基金项目:国家自然科学基金(No.60904028)资助的项目 |
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| 中文摘要: |
| 利用积分曲线的极限集,对紧流形$M$上向量场$X$所确定的积分曲线进行了分类, 在分类的基础上定义了向量场$X$的链群、
极限集闭链群和极限集边缘链群, 以及两个同类群, 最后还引入了向量场正向同伦和负向同伦的概念, 并证明了极限集是正向同伦和负向同伦不变的,
链群、极限集闭链群和极限集边缘链群 以及两个同类群在向量场双向同伦的情况下是同构的. |
| 英文摘要: |
| By using limit sets of integral curves, the authors give a classification of integral curves which are determined
by vector field on a compact manifold.
Based on this, chain-groups, limit set closed chain-groups, limit set boundary chain-groups of vector field and two
congener groups are defined respectively.
Finally, the authors introduce concepts of positive homotopy and negative homotopy of vector field, and prove that
limit sets possess positive and negative homotopy invariance, and chain-groups, limit set closed chain-groups and limit set boundary
chain-groups and two congener groups are isomorphic on bidirectional homotopy of vector field. |
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