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Oct 26, 2013 at 13:58 comment added Tom Goodwillie Curious. The cited result is for compact manifolds. I wonder if this is also true for noncompact manifolds, such as $\mathbb R^n$. If so, and if my sketched argument in my answer is correct, then that would seem to say that $PL$ automorphisms of an open ball is equivalent to homeomorphisms of a closed ball (which can't be right).
Oct 26, 2013 at 13:18 history edited Ricardo Andrade CC BY-SA 3.0
edited the introductory remark because it was poorly written
Oct 25, 2013 at 18:02 comment added Ryan Budney Thanks Ricardo, I'll try to take a look at this over the weekend.
Oct 25, 2013 at 17:33 history edited Ricardo Andrade CC BY-SA 3.0
deleted 1 characters in body
Oct 25, 2013 at 17:27 history answered Ricardo Andrade CC BY-SA 3.0