I like the Schroeder Bernstein theorem : http://en.wikipedia.org/wiki/Cantor%E2%80%93Bernstein%E2%80%93Schroeder_theorem http://en.wikipedia.org/wiki/Cantor%E2

I like the Schroeder Bernstein theorem : http://en.wikipedia.org/wiki/Cantor%E2%80%93Bernstein%E2%80%93Schroeder_theorem http://en.wikipedia.org/wiki/Cantor%E2%80%93Bernstein%E2%80%...