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Ideas for 'Logic (Encyclopedia I)', 'Frege philosophy of mathematics' and 'Grundgesetze der Arithmetik 1 (Basic Laws)'

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2 ideas

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

9848	Content is replaceable if identical, so replaceability can't define identity [Dummett, by Dummett]

9842	Frege introduced criteria for identity, but thought defining identity was circular [Dummett]