1
vote
1answer
220 views

how to prove that quotient group R/Z and the circle are diffeomorphism?

Are quotient group R/Z and the circle are diffeomorphism ? How to prove? Hope someone give me some advise or some reference documents.Thank you
2
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3answers
138 views

Structure theorem for foliations on $\mathbb R$

In my research, it so happens that it might be useful to look at foliations on a surface. I am however having a hard time absorbing a new subject. So, could somebody point me to some suitable ...