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'To be is to be the value of a variable..', 'Unpublished Notebooks 1881-82' and 'Frege philosophy of mathematics'
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2 ideas
9. Objects / F. Identity among Objects / 2. Defining Identity
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Content is replaceable if identical, so replaceability can't define identity [Dummett, by Dummett]
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Frege introduced criteria for identity, but thought defining identity was circular [Dummett]
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