most recent 30 from http://mathoverflow.net 2013-05-24T20:14:34Z http://mathoverflow.net/feeds/user/8860 http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://mathoverflow.net/questions/51531/theorems-that-are-obvious-but-hard-to-prove/51710#51710 Eric Hsu 2011-01-10T22:45:46Z 2011-01-10T22:45:46Z

<p>In the same genre, if not the same type: The Fundamental Theorem of Algebra. Easily understood by high schoolers, plausible, beautifully simple to state. As far as I know, there are no nice proofs understandable by a good (not brilliant) high school student.</p>