The implication of Rosen's perspective (and others, by the way) is that
time itself is subjective. Since time can only be quantified (labeled) in
terms of space, and vice versa, this implies that space too is subjective.
Yet I believe we need to account for the objective character of the
space-time world in terms that are not just individually referenced, but
shared by all observers. That shared view is incontrovertable; so what
accounts for its relative permanence? We need to see how the shared
objective "reality" is derived from the ultimately subjective one Rosen was
constructing. The problem has been that everyone has been assuming it would
work the other way around; that the subjective would be derived in some way
from the objective/computable. That makes no sense because one can't derive
the more general case from the more specific, yet the two can interact in
significant ways.
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John J. Kineman, Physical Scientist/Ecologist
National Geophysical Data Center
325 Broadway E/GC1 (3100 Marine St. Rm: A-152)
Boulder, Colorado 80303 USA
(303) 497-6900 (phone)
(303) 497-6513 (fax)
jjk@ngdc.noaa.gov (email)