On 9/6/2017 7:35 AM, Bruno Marchal wrote:
Some physicists can be immaterialist, but still believe that the fundamental reality is physical, a bit like Tegmark who remains (despite he is willing to think differently) open to the idea that the physical reality is a special mathematical structure among all mathematical structures, for example. That is problematical for pure mathematical reason: the notion of all mathematical structures do not make much mathematical sense, but it is of course problematic also with Mechanism, where the physical reality becomes the border of the whole "computable mathematics" (which is very tiny, as it is the tiny sigma_1 part of arithmetic).
I think Tegmark has changed his opinion and now only champions all /computable/ universes.
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