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• 11 definition of winding number, have doubt in definition.
• 11 in a topological space only finite subsets are compact sets
• 9 $\sum a_n$ be convergent but not absolutely convergent, $\sum_{n=1}^{\infty} a_n=0$
• 8 When does the product topology have a countable base?
• 8 $X=(-\infty,0]\cup\left\{{1\over n}:n\in\mathbb N\right\}$ with subspace topology Then
• 7 number of element in a principal ideal domain can be $25/36/35/15$?
• 7 what is the angle here in this cyclic triangle?
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