Conservativity (ch 2)

All determiners appear to be conservative. A conservative determiner relation is one that holds between two sets X, Y just in case it holds between the first and the intersection of the first with the second. Examples include 'Some Xs are Ys', 'Every X is Y', 'Few Xs are Ys', 'No Xs are Ys.' Examples of nonconservative determiner relation is all-but; 'All but Xs are Ys' does not hold between the set X and the intersection of X and Y, since the intersection of X and Y is empty.

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