User bob gompf - MathOverflowmost recent 30 from http://mathoverflow.net2013-06-18T22:59:07Zhttp://mathoverflow.net/feeds/user/16756http://www.creativecommons.org/licenses/by-nc/2.5/rdfhttp://mathoverflow.net/questions/54143/whats-the-kirby-diagram-of-a-universal-mathbbr4/71352#71352Answer by Bob Gompf for What's the Kirby Diagram of a universal $\mathbb{R}^4$?Bob Gompf2011-07-26T20:31:16Z2011-07-26T20:31:16Z<p>I would also like to know the answer to that. As far as I know, it is still a difficult, unsolved problem. The bit about 3-handles is a clue, but I haven't found any way to make use of it. </p>