Tit for tat

[Rustom Mody]

On Wednesday, April 29, 2015 at 3:46:24 AM UTC+5:30, John Ladasky wrote:

> I thought that Patrick Grim's analysis was very interesting, showing that the 
> Spatialized Iterated Prisoner's Dilemma (SIPD) could emulate the Wireworld 
> cellular automaton, which is a Turing-complete system.  Thus, the SIPD, a 
> seemingly simple system at first glance, includes configurations which are 
> formally undecidable in the Gödelian sense.  I'm not sure whether Grim proved 
> that an SIPD which includes the Tit for Tat strategy could emulate Wireworld, 
> but it seems likely that one could be built.

Thanks John for those pointers -- Ive been looking at it with interest.
This area is of some interest to me -- as my last two blog posts would indicate
http://blog.languager.org/2015/04/poverty-universality-structure-0.html
http://blog.languager.org/2015/03/cs-history-0.html

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PS Google groups invites to writing longlines which causes trouble to some
people out here (with historical machines?).