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Scientific EssentialismScientific essentialism, a view espoused by Saul Kripke, maintains that there exist essential properties that objects possess (or instantiate) necessarily. In other words, having such and such essential properties is a necessary condition for membership in a given natural kind. For example, tigers are tigers in virtue of possessing a particular set of genetic properties. If a tiger lost a leg, we would still call it a tiger. If it didn't possess stripes, we would still call it a tiger. That is because those properties are identifying (or appearance) properties - not essential properties. They are not necessary for being a member of the class of tigers. It is important, however, that the set of essential properties of an object not be used to identify or be identified with that object because they are not necessary and sufficient, but only necessary. Having such and such a genetic code does not suffice for being a tiger. We wouldn't call a piece of tiger fur a tiger, even though a piece of tiger fur contains the genetic information essential to being a tiger.
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