Sorry, this:

"Note that even if two general patches commute, their associated concrete 
patches need not to
commute. That is, that P and Q commute does not implies that P(T) and Q(P(T)) 
commute."

should be changed to:

"Note that even if two general patches commute, their associated concrete 
patches need not to
commute. That is, that P and Q commute does not implies that (T,P(T)) and 
(P(T),Q(P(T))) commute."

There are other minor typos that can be easily corrected.

Antonio Regidor Garc�a


                
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