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Jun 21, 2011 at 17:43 history edited Ryan Budney CC BY-SA 3.0
added 192 characters in body
Jun 21, 2011 at 16:56 comment added Ian Agol Many people call this Van Kampen's embedding obstruction: springerlink.com/content/m71886j8mu666061
Jun 21, 2011 at 16:08 history answered Ryan Budney CC BY-SA 3.0