Nice read. I was epxecting it to mention Knuth's arrow notation though[1] [1] http://en.wikipedia.org/wiki/Knuth%27s_up-arrow_notation http://en.wikipedia.org/

Nice read. I was epxecting it to mention Knuth's arrow notation though[1] [1] http://en.wikipedia.org/wiki/Knuth%27s_up-arrow_notation http://en.wikipedia.org/wiki/Knuth%27s_up-arrow_notation