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Audi Driver P.E.

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Perhaps you have plenty.  Perhaps you're even familiar with this already.  Have you heard of Kruskal's tree theorem?  Oh it's a read.  Wrap your head around this:

tree(1) = 2, tree(2) = 5, and tree(3) > 262140, but TREE(3) is larger than treetreetreetreetree8(7)(7)(7)(7)(7).

 
I read the Wikipedia article and I'm no closer to comprehending what its trying to say than I would be if it were written in Swahili.  Not only do I not understand what a tree is in this context, but I have no idea what reverse mathematics or ATR is (after reading their Wiki articles).

 
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