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Ideas for 'Realism in Mathematics', 'Political Liberalism' and 'How Things Persist'

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9. Objects / F. Identity among Objects / 8. Leibniz's Law
If two things might be identical, there can't be something true of one and false of the other [Hawley]
     Full Idea: We can call the 'transference principle' the claim that if it is indeterminate whether two objects are identical, then nothing determinately true of one can be determinately false of the other.
     From: Katherine Hawley (How Things Persist [2001], 4.9)
     A reaction: The point is that Leibniz's Law could immediately be invoked to show there is no possibility of their identity.