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Jan 28, 2019 at 13:51 comment added Kelvin Lois @BrunoMartelli I’m a student strugling with this question as well now. Would you provide a reference for the hint please ?
Apr 13, 2017 at 12:19 history edited CommunityBot
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Aug 21, 2015 at 23:24 comment added foliations @BrunoMartelli Do you have a reference for that?
Aug 21, 2015 at 11:48 comment added Jim Conant I seem to recall that Milnor's notes on Smale's proof of the Poincare conjecture carefully treated this type of question.
Aug 21, 2015 at 3:56 comment added Bruno Martelli Yes, it can, because you can pick two collars of the boundaries, and isotope each diffeomorphism $\phi^\pm$ so that it acts productwise on each collar. This is also the same technique one uses to prove that two smooth isotopies can be composed and transformed into a smooth isotopy.
Aug 20, 2015 at 22:26 history asked foliations CC BY-SA 3.0