Single Idea 8580

[catalogued under 7. Existence / D. Theories of Reality / 5. Physicalism]

Full Idea

Final definition of 'Materialism': Among worlds where no natural properties alien to our world are instantiated, no two differ without differing physically; and two such worlds that are exactly alike physically are duplicates.

Gist of Idea

Materialism is (roughly) that two worlds cannot differ without differing physically


David Lewis (New work for a theory of universals [1983], 'Min Mat')

Book Reference

'Properties', ed/tr. Mellor,D.H. /Oliver,A [OUP 1997], p.212

A Reaction

This would presumably allow for an anomalous monist/property dualist view of mind, but not full dualism. But if there are no psychophysical laws, what stops the mental changing while the physical remains the same?