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somervta comments on Causal Reference - Less Wrong
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Meditation:
If we can only meaningfully talk about parts of the universe that can be pinned down inside the causal graph, where do we find the fact that 2 + 2 = 4? Or did I just make a meaningless noise, there? Or if you claim that "2 + 2 = 4" isn't meaningful or true, then what alternate property does the sentence "2 + 2 = 4" have which makes it so much more useful than the sentence "2 + 2 = 3"?
Unfortunately I accidentally looked at some of the other answers first, but I think my answer would have been this anyway:
The fact "2+2=4" is a fact about the products of certain systems of thought and computation. It is also a abstract description of a certain property of objects in reality (namely, that taking two sets of two objects and combining the sets results in a set of four objects), at least at the classical level.