... 加强附加疑问句 emphatic tag question 拓扑球面 topological sphere 边际消费倾向 border expenditure tendency ...
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... 拓扑群：topological group 拓扑球面：topological two sphere 拓扑嵌入：topological embedding ...
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In this thesis, we mainly study several problems on geometry and topology of Rieman-nian submanifolds, which contains the geometric rigidity, topological sphere theorems and eigenvalue problems of Laplace-Beltrami operator on Riemannian submanifolds.
本文着重研究黎曼子流形上几何与拓扑的若干问题，主要内容包括子流形的几何刚性、拓扑球面定理和Laplace-Beltrami算子的特征值问题。
参考来源 - 黎曼子流形上几何与拓扑的若干问题研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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