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"Brain in a vat" experiment, arguing that skeptical scenarios are impossible.
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The theory that the same mental state, property, state, or event can be implemented by different physical properties, states, or events
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"Quantification over mathematical entities is indispensable for science, both formal and physical; therefore we should accept such quantification; but this commits us to accepting the existence of the mathematical entities in question
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"Meaning just ain't in the head." The claim that terms meanings are determined by factors outside of the mind.