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Aug 16, 2020 at 16:29 comment added Mike Battaglia The group of profinite integers - edited
Aug 16, 2020 at 16:29 history edited Mike Battaglia CC BY-SA 4.0
clarify notation
Aug 14, 2020 at 12:16 comment added Robert Frost What's $\hat {\Bbb Z}$ here?
Apr 13, 2017 at 12:19 history edited CommunityBot
replaced http://math.stackexchange.com/ with https://math.stackexchange.com/
Nov 11, 2015 at 20:32 vote accept Mike Battaglia
Nov 11, 2015 at 9:30 answer added Simon Henry timeline score: 7
Nov 10, 2015 at 23:48 comment added eric Yes and yes. Take Pontryagin duals! Then you're just asking whether the direct limit of qZ's is isomorphic to the direct limit of 1/n*Z's is isomorphic to Q, which is obvious.
Nov 10, 2015 at 23:18 history asked Mike Battaglia CC BY-SA 3.0