- #71
bohm2
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Willowz said:The thread would be most productive if we could go through Tegmarks reasonings for a mathematical universe. That is, why does he think it is indispensabile? "Just because it is", doesn't cut the mustard.
I think Tegmark comes to that conclusion because to a large extent,
"the propositions of physics are equations, equations that contain numbers, terms that refer without describing, many other mathematical symbols, and nothing else; and that these equations, being what they are, can only tell us about the abstract or mathematically characterizable structure of matter or the physical world without telling us anything else about the nature of the thing that exemplifies the structure. Even in the case of spacetime, as opposed to matter or force—to the doubtful extent that these three things can be separated—it’s unclear whether we have any knowledge of its intrinsic nature beyond its abstract or mathematically representable structure."
Thus, in physics, the propositions are invariably mathematical expressions that are totally devoid of direct pictoriality. Physicists believe that physics has to 'free itself' from ‘intuitive pictures’ and give up the hope of ‘visualizing the world'. Steven Weinberg traces the realistic significance of physics to its mathematical formulations: ‘we have all been making abstract mathematical models of the universe to which at least the physicists give a higher degree of reality than they accord the ordinary world of sensations' ( e.g. so-called 'Galilean Style').
But I think it's far-fetched to jump the ship and say there is nothing but math because one still has a "math-phenonology" unification problem replacing the mind-body explanatory gap. For how do mathematical entities lead to phenomenology? It seems to me that mathematical objects because of their abstractness are just the best mental objects/tools we have for describing stuff that our senses and every day notions cannot describe. But there seems to be far more than just mathematical objects as introspection/subjectivity reveals:
"And Since we know—more certainly than anything else—that experience is real, and is therefore wholly physical, if materialism is true, we have reason, as materialists, to think, with Priestley, Russell, Eddington, and others, that experientiality is a fundamental feature of the physical."
http://mitpress.mit.edu/books/chapters/0262513102pref2.pdf
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