Lie theory
回答 (1)
2009-06-29 7:08 pm
✔ 最佳答案
As a group, S1xS1xS1 is abelian, but S3 is not.As a manifold, S3 is simply connected, but S1xS1xS1 is not.
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https://hk.answers.yahoo.com/question/index?qid=20090628000051KK00933