most recent 30 from http://mathoverflow.net 2013-05-23T06:14:58Z http://mathoverflow.net/feeds/user/13997 http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://mathoverflow.net/questions/59978/additive-subgroups-of-the-reals Alex 2011-03-29T15:39:21Z 2012-04-12T14:48:09Z

<p>Does anyone know if there is a classification of the subgroups of the real numbers taken under addition? If not can anyone point me in the directiong of any papers/materials which discuss properties of or interesting facts about these subgroups? </p>