pei wrote:
> "M1 and M2 can simulate each other" doesn't mean "M1 and M2 are
> identical",
> nor that the two should be analyzed in the same way.

I agree, of course

> Efficiency is one
> issue, the suitability of concepts is another.
>

The two issues are closely linked though.  If M1 and M2 can each simulate
each other very efficiently, it's very likely that the same concepts will be
useful for describing both.  If they cannot each simulate each other very
efficiently, it's fairly likely that different concepts will be useful for
describing the two of them.

-- Ben G

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