LizR wrote:
On 30 April 2015 at 16:32, Bruce Kellett <bhkell...@optusnet.com.au
<mailto:bhkell...@optusnet.com.au>> wrote:
So where are the space and time dimensions of Platonia? Not to
mention the necessity of a Minkoskian metric. (Space and time are
interchangeable only within the limits of the light cone.)
Dimensions are (represented by) coordinate systems. Minkowski spacetime
is (represented by) a 4D manifold.
My point was that this has to emerge from the Platonia envisaged by
Bruno -- it can't simply be imposed by fiat.
I have been looking again at Julian Barbour's book. His Platonia is
essentially the configurations space of quantum mechanics: three spatial
coordinates for every particle in the universe. In this Platonia all
possible configurations of the universe are realized. This has a vast
number of dimensions, but still some structure is imposed by knowing
that space is three dimensional and that there was a big bang (at some
point, not an imposed /beginning/).
Computationalism does not have this head start -- it has to get it all
from nothing.
Bruce
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