Supervenience
“A Supervenience Thesis is a denial of independent variation.[...] To say that so-and-so supervenes on such-and-such is to say that there can be no difference in respect of so-and-so without difference in respect of such-and-such. Beauty of statues supervenes on their shape, size, and colour, for instance, if no two statues, in the same or different worlds, ever differ in beauty without also differing in shape or size or colour.”
David Lewis, Papers in Metaphysics and Epistemology, p. 29
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