sark comments on Rationality Quotes: March 2011 - Less Wrong
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It's hard to define 'real'; it's not clear that it's doing any work. If you're curious, Gary Drescher in Good and Real (who is on good terms with logic) argues in the last chapter that the real/unreal distinction is not meaningful.
Err no! He says that 'real' means something like causally accessible from where we are. It's something like "from my perspective I am real, but from the perspective of a fictional-me in a fictional-universe, I am not, while the fictional me is real". Except this is not a very helpful way to define 'real'. There is no meta-realness, but relativistic-realness is quite as useless. Drescher dissolves the issue, by reducing 'real' to something like "whatever we can possibly get at from where we are in this universe".
Yes. He has several paragraphs where he points out that the usual understandings of 'real' are incoherent in his 'equations' framework, and only then goes on to suggest a new and entirely different sort of 'real', which isn't quite causally accessible (since remember, he's previously arguing for a Parmenidean 4D block-universe) but more one of definition: