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Ideas for 'fragments/reports', 'The Origin of the Work of Art' and 'Nominalism and Substitutional Quantifiers'

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9. Objects / F. Identity among Objects / 2. Defining Identity

10797	Substitutivity won't fix identity, because expressions may be substitutable, but not refer at all [Marcus (Barcan)]
	Full Idea: Substitutivity 'salve veritate' cannot define identity since two expressions may be everywhere intersubstitutable and not refer at all.
	From: Ruth Barcan Marcus (Nominalism and Substitutional Quantifiers [1978], p.167)