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Jul 7, 2018 at 9:09 vote accept cll
Jul 6, 2018 at 20:52 comment added Will Sawin @VesselinDimitrov Thanks for pointing that out. Specifically, the paper you link credits the resolution of the original question to Iwasawa.
Jul 6, 2018 at 20:29 comment added Vesselin Dimitrov More generally, Lawrence (Proc. Amer. Math. Soc.) has proved that a countable abelian group carrying a discrete norm is free. Since $E(\mathbb{Q}^{\mathrm{ab}})$ has the strong Bogomolov property on the canonical height, the same result follows. Similarly, say, $E(\mathbb{Q}^{\mathrm{tr}}) / \mathrm{tors}$ is the direct sum of countably many copies of $\mathbb{Z}$. There was a paper ( arxiv.org/pdf/1408.4915.pdf ) on this by Grizzard, Habegger and Pottmeyer.
Jul 6, 2018 at 20:05 history edited Will Sawin CC BY-SA 4.0
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Jul 6, 2018 at 19:33 history answered Will Sawin CC BY-SA 4.0