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Dec 13, 2018 at 13:46 review Suggested edits
Dec 13, 2018 at 14:40
Nov 25, 2010 at 11:57 vote accept Pengfei
Nov 25, 2010 at 11:00 answer added Noz timeline score: 5
Nov 25, 2010 at 9:50 answer added rpotrie timeline score: 2
Nov 25, 2010 at 6:47 history edited Pengfei CC BY-SA 2.5
added 1 characters in body
Nov 25, 2010 at 6:41 history edited Pengfei CC BY-SA 2.5
improved formatting
Nov 25, 2010 at 1:26 answer added Kevin H. Lin timeline score: 5
Nov 24, 2010 at 18:08 comment added Ryan Budney Regarding your question (1), yes. That's what I'm saying. The covering space argument is one way to approach this. Re (2) that is an if and only if $\chi M =0$, where I use $\chi M$ as shorthand for the Euler characteristic. This is of course assuming $M$ is connected.
Nov 24, 2010 at 14:29 answer added Georges Elencwajg timeline score: 4
Nov 24, 2010 at 8:55 history edited Pengfei CC BY-SA 2.5
improved formatting
Nov 24, 2010 at 3:11 answer added Ryan Budney timeline score: 9
Nov 24, 2010 at 1:42 history asked Pengfei CC BY-SA 2.5