On 07 Nov 2008, at 15:57, Mirek Dobsicek wrote:
>
> Bruno Marchal in an older post wrote:
>>> 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 th
Bruno Marchal in an older post wrote:
>> 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?
>
>
> Tim makes
Title: Re: Some books on category and topos theory
Tim May wrote:
Whether knots are the key to physics, I can't say. [...]
Knots are the key to (quantum) entanglement.
s.
Title: Re: Some books on category and topos
theory
At 12:24 -0700 9/07/2002, Tim May wrote:
Whether knots are the key to physics, I
can't say. Certainly there are suggestive notions that particles might
be some kind of knots in spacetime (of some
dimensionality)...
Interesting! Chromo
On Tuesday, July 9, 2002, at 11:08 AM, Bruno Marchal wrote:
>
> Me too. Now, I feel almost like you about ... knot theory.
> And this fit well with your cat-enthusiasm, for knot theory is
> a reservoir of beautiful and TOE-relevant categories
> (the monoidal one). I've just
> ordered Yetter's bo
At 9:24 -0700 9/07/2002, Tim May wrote:
>Reading styles differ, but I have come to favor the "hawk spiral." I
>see hawks spiralling in the thermals near my house, and this is how
>I like to learn. I read something from one book, think, read from
>another, think, try to compare what the authors
On Tuesday, July 9, 2002, at 07:41 AM, Bruno Marchal wrote:
>
> Tim makes a very genuine remark (but he writes so much I fear that has
> been unnoticed!).
True enough...I write a lot! (The old joke applies: "I don't have enough
time to write a short letter.")
> He said: read Tegmark (Everyt
Wei Dai asks some question to Tim May which I would like to comment
taking into account some other posts.
Wei Dai:
>Suppose I had the time for only one book, which would you recommend?
I think you (Wei) decide to look for the book by Lawvere. Good choice
but you should know it is just an intro
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 p
On Friday, July 5, 2002, at 01:16 PM, Tim May wrote:
> The category and topos theory books I actually _own_ (bought through
> Amazon) are:
>
>
Oops! I left out one of the most important and accessible of the books I
have and recommend:
* McLarty, Colin, "Elementary Categories, Elementary Top
On Friday, July 5, 2002, at 10:54 AM, Bruno Marchal wrote:
> But, perhaps more importantly at this stage I must recall the book
> "Mathematics of Modality" by Robert Goldblatt. It contains fundamental
> papers on which my "quantum" derivation relies. I mentionned it a lot
> some time ago.
> And
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