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Oct 20, 2021 at 11:03 history edited Martin Sleziak CC BY-SA 4.0
MathJax: \di
Aug 8, 2013 at 5:10 comment added Ryan Reich A bit late, but: finally, a gripping example of the difference between $C^k$ and $C^\infty$ manifolds! (Not that I was really looking.)
Jul 29, 2011 at 16:58 comment added Ravi Vakil Holy moly! That's incredible!
Nov 5, 2010 at 11:23 vote accept Daniel Miller
Nov 4, 2010 at 8:50 history edited Georges Elencwajg CC BY-SA 2.5
Added a few words at the end
Nov 3, 2010 at 21:47 history answered Georges Elencwajg CC BY-SA 2.5