Originally Posted by

**Xei**
I don't think there are any philosophical implications of M-Theory, other than the fact (which is accessed by other means) that human intuition is only local rather than representing some kind of a priori truth, and that there seems to be a strongly abstract mathematical basis for the universe.

The extra dimensions are just formalism. They don't mean anything, they're just consistent with a hypothetical generalisation. For a physicist the difference between 3D and 4D is just (x,y,z) and (x,y,z,w); just symbols. The mind is based on 3 spacial dimensions and a time dimension and that is all we'll ever have meaningful access to.

It seems to me that almost all of these discussions come from misuse of words. Dimension is very often abused, meaning at least three different things: the mathematical dimensions of a space (which is what it means in M-theory), alternate dimensions as a slang for alternative universes (as in a multiverse or the quantum interpretation), and finally the whole spiritual 'planes of being' thing. They have nothing to do with one another; it's just a homonym of human construction. There's no truth here.

I mean, why does nobody ever of the philosophical implications of, for example, E8, which may be the symmetry group of the universe? It's just as abstract and formal as dimensions.

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