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selylindi 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"?
There seem to be all sorts of reasons that our distant ancestors' development of a number sense was useful enough to be evolutionarily favored. Do we still have everyone in the tribe? Do we outnumber the enemies? How many predators were chasing me? Are these all of my children? A number sense that told us "2+2=3" could be quite maladaptive.