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Its unprovable and a meaningless concept. There is no observable evidence that can distinguish so called "p zombies" or so called "real persons". Might as well call it a "unicorn in space" or anything else meaningless.

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Notice how you describe a perfectly intelligible concept like 'unicorn in space' as meaningless, even though there's a clear picture you can form in your mind about it and you can imagine the exact evidence that would convince you of their existence.

We can meaningfully talk about 'unicorns in space' since it's analytically intelligible and merely syntetically unverified.

In this example the unicorn in space would be unverifiable, if it was verifiable then its an actual difference and not pertinent to the analogy. The way people define p-zombies, the literal definition states they are observationally equivalent to "normal" people. Then the question arises, what even is the point then? That means its literally equivalent. Its absurd to make up and impute random non-existent crap "inside" it.

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