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A proof is correct not because it matches an authority figures proof that was published somewhere, but because it meets the standards of logical rigor that a proof requires. You must learn to obsess over the right details. Its easy to avoid obsessing at all, or obsessing over trivialities like grades (yes, I mean that). But its difficult to ask the right questions and see the right paths in a problem that need to be taken care of. Others Im thinking of are harder to enumerate. For example, its easy.