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Well, the definition of "fundamental" is that it can not be made of other stuff.. otherwise it is not fundamental.
And, it is about the definition of reality and illusion.
If something fundamental can only be described as mathematical concept, it is perfectly OK.. and it does not imply that everything else build from those is illusion. It only means that we can not describe those fundamental entities (strings or whatever) in other, more simpler terms.
If we can, then they are not fundamental.
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