Ideas from 'Classes and Attributes' by Richard Cartwright [1967], by Theme Structure

[found in 'Philosophical Essays' by Cartwright,Richard [MIT 1987,0-262-53092-9]].

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8. Modes of Existence / B. Properties / 11. Properties as Sets
While no two classes coincide in membership, there are distinct but coextensive attributes
                        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.