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What about this principle? ("if K (P - > ~ Q), then ~ k (~ Q) - > ~ k (P)") (if you know (P implies non-Q, then you don't know non-Q implies don't know P)
I learnt about that Nozick gave an anti skeptical argument based on this principle from Jesper Kallestrup's "Semantic Externalism "(New Problems of Philosophy),but I think his argument confused the image (electrical signal) of our "foot" in the brain in the vat with our actual foot (if we have one).