most recent 30 from http://mathoverflow.net 2013-05-24T19:27:19Z http://mathoverflow.net/feeds/user/25397 http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://mathoverflow.net/questions/78018/set-theoretical-multiverse-and-foundations/103410#103410 Gill Williamson 2012-07-28T21:47:22Z 2012-07-28T21:47:22Z

<p>The arXiv paper <a href="http://arxiv.org/abs/1009.2058" rel="nofollow">http://arxiv.org/abs/1009.2058</a> gives an example of a toy landscape which has a concrete combinatorial (lattice) description yet leads naturally to simply stated conjectures that are ZFC undecidable. The combinatorial structures are familiar to most mathematicians.</p>