On 3/4/2017 1:19 AM, Stephen wrote:
>
> So what brought this on? Drugs actually, I woke up early at 4 am and as
> I am going into town today. To stop falling asleep I took one of my
> remaining Modafinil tablets that I was prescribed for jet lag, a few
> years ago. It is known as a “smart drug” a cognitive enhancer. I would
> never use it for that if I were studying. I find it too easy to get
> distracted. I was watching a video on very large numbers when it went on
> to TREE(3). So I googled it and spent an hour following the links within
> links in Wikipedia so I could try and understand what was being talked
> about.

If you have some math background, I really like this paper describing 
some of the set theory proofs behind the TREE function: 
http://www.cis.upenn.edu/~jean/kruskal.pdf

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