On 05 Feb 2015, at 01:16, meekerdb wrote:
On 2/4/2015 10:13 AM, Bruno Marchal wrote:
With computationalism, physics is not causally closed,
Even with computationalism it seems physics is causally closed
except for the apparent randomness of QM. But if you believe in MWI
that is closed too. The UD is not casually closed because it is
always starting new threads of computation - with no cause.
No cause? It start new threads because it generate them all, and
dovetail on them. The universal dovetailing is equiavlent with the
proofs, and attempt of proofs, of the sigma_1 sentences.
a bit like arithmetic is not arithmetically closed either, the
universal machine put a mess in Platonia which is beyond the
possible control by the universal machines.
But all computation is closed. What does it matter that there are
uncomputable parts of arithmetic? They don't affect the computations.
You forget the FPI on the arithmetical reality.
You are speculating on a god "Matter" who by its magical power,
singularize you with that matter, and makes your infinitely many
brothers living in arithmetic into zombies.
Bruno
Brent
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