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Willard Van Orman Quine (/kwaÉªn/; June 25, 1908 â December 25, 2000) (known to intimates as Van) was an American philosopher and logician in the analytic tradition, recognized as one of the most influential philosophers of the twentieth century..
Quine's conception of natural kinds is liberal. Not all sets are natural kinds, but any set whose members share a natural property are a natural kind. So the set of white objects is at least a candidate natural kind and Quine asserts that positively charged objects form a natural kind.he best known of the semantic arguments as applied to natural kind terms is Putnam's Twin Earth thought experiment (see Section 1.3.1). Putnam asks us to imagine that elsewhere in the universe there is a planet exactly like Earth in virtually all respects, which we may call âTwin Earthâ.