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Ideas for 'Facts and Propositions', 'Classes and Attributes' and 'How Things Might Have Been'

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8. Modes of Existence / B. Properties / 11. Properties as Sets

9783	While no two classes coincide in membership, there are distinct but coextensive attributes [Cartwright,R]
	Full Idea: Attributes and classes are said to be distinguished by the fact that whereas no two classes coincide in membership, there are supposed to be distinct but coextensive attributes.
	From: Richard Cartwright (Classes and Attributes [1967], §2)
	A reaction: This spells out the standard problem of renates and cordates, that creatures with hearts and with kidneys are precisely coextensive, but that these properties are different. Cartwright then attacks the distinction.