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Manfred comments on P(X = exact value) = 0: Is it really counterintuitive? - Less Wrong Discussion
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We're talking about the entire universe here, so it would be just as valid to say we don't know of anything else that is (discretely) computable.
And yeah, there is always some level of discreteness that would have no impact on our observations, just like there is some level of teapots in the asteroid belt that would have no impact on our observations. You're right that that sort of thing isn't ruled out by the evidence, so my statement was wrong.
Teapots in the asteroid belt are contrary to Occam's razor. The situation with discrete physics is very different. Science has a long history of showing that apparently-continuous phenomena actually turn out to be grainy on a smaller scale.