Hal Ruhl wrote: >As I understand it Comp says that all those physical universe isomorphic >couplings to the output of the UD somehow exist.
With comp there is no *physical* universe. Just (relative) computational histories. Appearance of *physical universe* are explained as first person plural view of collection of deep computational histories. (Deep in Bennett's sense). It is locally third person. It is the tangent point of view. Bruno