Dear Hans, Bret and Friends,

    I submit this paper by S. Wolfram on intractability and undecidability
that you all might find of interest:

http://www.stephenwolfram.com/publications/articles/physics/85-undecidabilit
y/2/text.html


    Please note the part that discusses "coordinate reparametrizations"
between finitely specified 4-manifolds ... ;-)

Kindest regards,


Stephen

----- Original Message -----
From: "Hans Moravec" <[EMAIL PROTECTED]>
To: "Brent Meeker" <[EMAIL PROTECTED]>; "Everything-list"
<[EMAIL PROTECTED]>
Cc: "Hans Moravec" <[EMAIL PROTECTED]>
Sent: Monday, December 30, 2002 9:39 PM
Subject: Re: Quantum Probability and Decision Theory


> Brent Meeker:
> > It seems [factoring] has been proven recently to be in P:
> > http://crypto.cs.mcgill.ca/~stiglic/PRIMES_P_FAQ.html#PRIMES
>
> No, that's primality testing, which has always been
> much easier than factoring.
>
>


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