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Epistemology 1960s
"Brain in a vat" experiment, arguing that skeptical scenarios are impossible. -
Multiple Relizability 1960s
The theory that the same mental state, property, state, or event can be implemented by different physical properties, states, or events -
Philosophy of Mathematics 1971
"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 -
Semantic Externalism 1973
"Meaning just ain't in the head." The claim that terms meanings are determined by factors outside of the mind.