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when toggle format what by license comment
Sep 9, 2023 at 16:00 history edited Glorfindel CC BY-SA 4.0
broken link fixed, cf. https://meta.mathoverflow.net/q/5301/70594
Nov 8, 2016 at 22:02 history edited Renato G. Bettiol CC BY-SA 3.0
Added non-examples
Sep 5, 2012 at 13:29 vote accept Mostafa
Sep 5, 2012 at 13:22 comment added Mostafa I was primarily looking for elementary and "concrete" examples, that you provided in dimension 2. In dimension 3, Seifert manifolds can be examples, as mentioned by Liviu. The problem of classification may be too general indeed.
Sep 4, 2012 at 19:31 history edited Renato G. Bettiol CC BY-SA 3.0
Added dim=2 case
Sep 4, 2012 at 19:13 history answered Renato G. Bettiol CC BY-SA 3.0