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added this pointer:
added pointer on 3d-3d correspondence for lens spaces:
Thanks for the correction! Regarding
are in some sense the simplest
there is at least one precise sense in which this is true, namely Lens spaces are the only 3-manifolds one can obtain by integral Dehn surgery on the unknot except for $S^{3}$ and $S^{2} \times S^{1}$. In a hurry now, so no time to find a reference, but it might be nice to add this to the entry; it should be in any textbook on geometric topology.
Okay. I have added the “in some sense” only to make clear that at this point it’s an informal statement. But if it can be made precise further down in the entry, all the better.
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