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Apr 18, 2014 at 1:00 comment added Danny Ruberman Thanks Dylan--that was pretty silly; I fixed the citation. I might add that the survey of Budney and Burton, Embeddings of 3-manifolds in $S^4$ from the point of view of the 11-tetrahedron census (arxiv.org/abs/0810.2346) is a great resource for anything you might want to know about embeddings of 3-manifolds in 4-space.
Apr 18, 2014 at 0:49 history edited Danny Ruberman CC BY-SA 3.0
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Apr 18, 2014 at 0:11 comment added Dylan Thurston I think you mean "On embeddings of 3-manifolds in 4-space". The other way around would make a short paper!
Apr 16, 2014 at 21:51 comment added Marc Nardmann You interpreted my question correctly. Thank you. Just to say it explicitly: Your answer shows also that the answer to Q3 is "n=3", because it is easy to see that every open 2-manifold which is parallelisable (equivalently: orientable) has property P2. (The case n<2 is trivial anyway.)
Apr 16, 2014 at 21:39 vote accept Marc Nardmann
Apr 16, 2014 at 15:41 history answered Danny Ruberman CC BY-SA 3.0