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May 11, 2010 at 17:36 comment added Robin Chapman So we back in one dimension again.
May 11, 2010 at 7:13 comment added Roland Bacher Sorry, part of the correction got lost du to a missing space between $<$ and $a$.
May 11, 2010 at 7:11 history edited Roland Bacher CC BY-SA 2.5
added 134 characters in body
May 10, 2010 at 18:30 comment added Robin Chapman Of course, a closed set need not have an upper bouned Also what is $\beta$?
May 10, 2010 at 17:54 comment added Roland Bacher Of course. I have fixed this stupid error.
May 10, 2010 at 17:53 history edited Roland Bacher CC BY-SA 2.5
stupid error fixed
May 10, 2010 at 16:47 comment added André Henriques This is not C^inf. Example: take the closed set to be {-1,1}, then your function is not C^1 at 0.
May 10, 2010 at 15:41 history answered Roland Bacher CC BY-SA 2.5