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.
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.
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