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Often, people who claim to be psychic also claim that they have an ability to perceive or to have verification of the existence of things that other people do not have (but could possibly obtain). How is this different from the mathematician who discovers, or claims to have discovered, a proof? Certainly, many mathematical proofs are not for the layman to approve of or dispute, because of a certain lack of ability. Both claim to see or to have proof (although different types of proof) of something, but in both cases one can imagine at least one person that cannot verify that the proof really is (a) proof.

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