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Feb 2, 2019 at 3:45 history edited Terry Loring CC BY-SA 4.0
corrected explanation of f, following the comment.
Feb 1, 2019 at 21:54 comment added Alexander Alldridge I think that $f$ should send $-\pi/2$ to one.
Aug 7, 2014 at 12:57 comment added John N. Thank you very much for the answer. By the way, yesterday I found your work "Torus and Noncommutative topology" and I found it really interesting and helpful, in particular when it is considered the first Chern class to verify that the above projection is a generator.
Aug 7, 2014 at 12:53 vote accept John N.
Aug 6, 2014 at 4:43 history answered Terry Loring CC BY-SA 3.0