Caledonian2 comments on Hand vs. Fingers - Less Wrong
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Since we can't extrapolate our physics that far, we don't know whether they're truly compatible with our understanding of physics or not.
Of course there is. If a feature can be removed from a model without affecting any outcome of the model, that feature never applied to the system we're trying to model. It didn't exist.
If you postulate a world that functions precisely as ours does in every way, but a mysterious property called 'consciousness' has been removed, than 'consciousness' does not and cannot exist in our world. It affects nothing. It is affected by nothing. It is not a part of existence.
Saying that something has absolutely no consequences of any kind, while asserting that it exists, is incoherent. The p-zombie concept is incoherent.