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it would know "how to get a beer if you were a brain in a vat." Otherwise that would be something it wouldn't know - making it not omniscient
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Marburg - my point is that it might know
that it's impossible for it to get a beer. I mean, assuming we take the laws of thermodynamics as given (if not, substitute your own favourite unbreakable law of maths/physics/anything), but the brain would know that "you can't get (and keep - for those who want to talk about vacuum energy) energy out of nothing". It doesn't make physics professors any less knowledgeable that
they know something cannot be done.
However, if you believe that there is no unbreakable law then you and
Moonduck are right - but then think about a BIAV that wants to make 2+2=5 or something!