On 16 Apr 2013, at 20:05, meekerdb wrote:
On 4/16/2013 2:16 AM, Bruno Marchal wrote:
But as logician, I can't exclude completely a (comp) physics with
non causal events, as the physics extracted from comp is only in
its infancy, to say the least. Even in that case the non physical
cause will have an arithmetical reason, and that non cause would
emerge from the first person (plural) indeterminacy on the UD* or
(sigma1) arithmetic. No need of unnecessary magic.
I would expect that in comp the same event would have arbitrarily
many different causes.
Hmm... That's a bit ambiguous. I would say that a physical event
has one cause : the multiple arithmetical realization leasing to
some observer state. There is one cause or one reason, but it is
infinite in extent---it is infinitely realized or implemented in
arithmetic.
As Stathis pointed out, since a brain has only a finite number of
possible states (assuming comp) it is inevitable that a state be
repeated provided the brain lasts long enough.
Or that elementary arithmetic is correct. OK.
But there need not be identical causal chains leading to this state.
That is what I said. That are the multiple realization (in arithmetic)
leading to my state.
A Turing machine can reach the same state by different sequences of
computation.
Absolutely so.
QM is time reversal invariant, so if it predicts different future
states of the observer then it also retrodicts different past states.
The same already occurs in arithmetic. I guess my english was unclear
as I agree with all what you say here.
Bruno
Brent
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