Hi Tim, it's really interesting to see you here. (For those who don't 
know, I knew Tim from the cypherpunks mailing list. Hal Finney was an 
active member of the list as well. See 
http://www.activism.net/cypherpunk/crypto-anarchy.html if you're wondering 
what a cypherpunk is.) Two of the most prominent cypherpunks I know are 
now on my Everything mailing list. I wonder what that means... Anyway, 

I remember your post on the cypherpunks list about category theory, but I 
have to admit I didn't pay it much attention since it didn't seem very 
relevent at the time. I guess this is my second chance to learn about 
category theory, so there are some questions for you.

Suppose I had the time for only one book, which would you recommend? Also, 
can you elaborate a bit more on the motivation behind category theory? Why 
was it invented, and what problems does it solve? What's the relationship 
between category theory and the idea that all possible universes exists? 
Does it help understand or formalize the notion of "all possible 
universes"? I know in logic there is the concept of a categorical theory 
meaning all models of the theory are isomorphic. Does that have anything 
to do with category theory?

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