Florent Becker wrote:
> If I remember correctly, in the camp paper, that would correspond to the 
> "commute consistent" axiom. As far as i know, it cannot be deduced from 
> permutivity, ie it is really an axiom, but you don't need to introduce 
> merging, it is purely a property of commute.

Yes. You can, however, translate this property about commuting a sequence

   x C o A y B yz

into a property about merging three patches

   o X x
   o Y y
   o Z z

by defining

   X = C^(-1)
   Y = A
   Z = B'  such that  o A y B yz  <->  o B' z A' yz



Regards,
apfelmus

--
http://apfelmus.nfshost.com

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